/ 01
High Maintenance Cost
If you are investing more money to keep your system running than making it more capable and integrating advanced features, it's a sign that the legacy system is overshadowing your ROI plans.
Legacy Application Modernization Services
★★★★★ 4.9 Clutch Rating 1,000+ Softwares Launched 20+ Years of Experience SOC 2, HIPAA and PCI DSS certification
Trango Tech offers legacy application modernization services to SMEs, mid-sized markets and large enterprises. We help your business transform from a fundamental system to a modern and cloud-based platform by using the 7R’s technique, including rehost, replatform, refactor, rearchitect, rebuild, replace or retain strategy. Our team modernizes your app while keeping your business continuity without losing your current paperless core logic. It’s time to advance your operations with an auto-diagnosis system, seamlessly and with 100% IP ownership.
20+
of engineering
1,000+
Apps delivered
4.7★
Clutch verified
30–50%
lower maintenance cost
Top Choice of US Engineering, Tech and Regulated Firms
Deloitte · AWS · SAP · Google Cloud · Cisco · IBM · Stripe · Google Cloud · Cisco · IBM · Stripe · Twilio · Microsoft · Orachle · Accenture · Accenture · Salesforce · Salesforce · SAP · Google Cloud · Cisco · IBM · Stripe · Twilio ·
Key Takeaways
- Legacy software modernization process involves conversion of old systems as per modern world needs, including coding, architecture, infrastructure and data management to current and cloud-ready platforms.
- Trango Tech is a legacy modernization company based in the USA. We bring 20+ years of experience with 1,000+ successful applications shipped and maintain a 4.7 rating on Clutch. Serving countrywide and globally with headquarters present in Houston, TX.
- Our standard offers start with a fixed diagnosis fee ranging from $15k to $40k. We charge $20k to $150k for legacy application replatforming, $150k to $300k for refactoring, $300k to $500k+ for rearchitecting, and $1M to $10M+ for enterprise ERP or mainframe modernization.
- We modernize legacy systems without disrupting ongoing operations by using proven software engineering techniques, including characterization tests, the strangler pattern and side by side feature shift with swift rollback.
- All of our legacy application migration projects are presented with designated technology specialists, a shared NDA, a well-defined scope from start to the end of the process, 100% source code and IP ownership. We comply with mandatory regulations like HIPAA, PCI DSS, SOC 2, and GDPR throughout the migration process.
Founded: 2004 HQ: 1923 Washington Ave, Houston, TX Team: 280+ engineers Delivered: 1,000+ softwares Markets: United States & global Rating: 4.7 Clutch (30+ reviews)
Last updated: August 2026 (we review price and stats quarterly)
The Direct Answer
What is legacy application modernization?
Legacy app modernization is a process of updating your old system to an advanced one as per new world requirements and user demands. The method involves modernization of code, architecture, infrastructure, and data to make it ready for cloud platforms while preserving your brand core logic without disrupting operations. The techniques start from simple cloud migration to complete rearchitecting into microservices. Services are chosen as per business requirements against cost, risk and outage threshold.
Entrepreneurs often investigate our development team during discovery sessions: What is the best approach for modernizing a legacy application? We always tell them modernization is not a single rewrite game. It goes via revolutionary redesigning, reengineering and better infrastructure as per the standard 6Rs or 7Rs. These methods focus on innovation via rehost, replatform, refactor, rearchitect, rebuild, replace, or retire techniques. The prime reason for system upgrade is not focused on new technologies; rather, it values your money, gives your brand a stronger security posture, improves its interaction capabilities, and launches quickly with modern systems.
The financial value of legacy software modernization services is cheaper than maintaining your existing systems. Gartner research concludes that software houses invest up to 80% of their budget just in system upkeep and Deloitte’s Global Technology Leadership study found that organizations spend 21 to 40% by choosing suboptimal software solutions. Choosing unsupported platforms keeps your product at integration risk along with security vulnerabilities.
Why Modernize
Why Do Businesses Need Legacy App Modernization Services?
Don’t question why legacy applications need modernization? Rather, think logically! Staying on an old system is already costing you a lot! It is smart to move with the world. Get rid of legacy systems because they’re consuming your budget, restrict your app to old features, don’t meet new security standards requirements and require more manual operations. This remodeling saves you 30 to 50% maintenance cost and generates profit within 18 to 36 months.
60–80%
of IT budget accounts for maintenance services of legacy systems instead of adding
new value
(Gartner)
$2.41T
is an estimated US cost consumed for software technical debt
(CISQ)
67%
of modernization project costs may increase by 35% if standard process is not
followed from start.
80%
of software decay is based on architecture. It is something that can't be fixed
merely by refactoring
(Gartner)
Sources: Gartner IT spending and technical debt research, Deloitte Global Technology Leadership Study (2026), and CISQ Cost of Poor Software Quality in the US report. All figures mentioned above are industry-based standard values, not our estimates.
Lower Operational Cost
The biggest benefit is cloud native workloads and inactive licenses reduce the maintenance and infrastructure cost from 30 to 50%.
Faster Delivery
CI/CD, unlinked and microservices enable faster software development. You get legacy modernized apps faster than other quarterly releases.
Robust Security
Your system automatically fixes the faults found, uses stronger security access, and supports platforms that get easy updates per security needs.
Easier Hiring
This generation of engineers is trained to use modern technologies, not legacy programming languages like COBOL, VB6 or custom frameworks.
Auto Assessment
7 Signs when Legacy System Modernization is Essential
See the 7 red flags! If your business is facing any of these issues, then be alert because system modernization is no longer a nice to have operational necessity but a crucial need that runs high quality applications with lower risks and cost.
/ 02
Obsolete Technology
The use of End-of-Life (EOL) technology, such as platforms, frameworks or databases with no hotfix or seller financing leads to increasing operational and financial risks in every audit inspection report.
/ 03
Hard to Recruit
Old systems require outdated programming language expertise, like COBOL, VB6 or bespoke frameworks. It is hard to find a potential candidate having competence in these sectors & every departure leads to a bus factor.
/ 04
Slow & Risky Releases
Adding new features to your existing system takes weeks or months and even becomes a barrier irrespective of relevance. In simple words, deploying small tunings has turned out to be a fear for such firms.
/ 05
Can’t Integrate
Smooth integration appears as another challenge! Your aged system can’t connect with modern APIs, partners or channels without manual help. It stops your business from growing, rising, and meeting your vision.
/ 06
Compliance & Security Gaps
Traditional systems do not support modern technology features like multi-factor authentication (MFA), data encryption and structured logging. These stacks are compulsory as per regulated data requirements.
/ 07
Outdated Information
Another challenge is that nobody can fully understand the old system mandates as people are more directed towards learning new technologies. There is nothing wrong to say that one day ancestors will pass, leaving unmanageable systems behind.
Interactive Tool for Readiness Assessment
Free Legacy Application Modernization Assessment
Invest 120 seconds and answer the following 4 questions below to assess your system. Our tool assesses and scores the system, then suggests a modernization strategy, either rehost, refactor, rearchitect or rebuild.
1. How business critical is the application?
2. How old is the codebase and how well documented?
3. How many systems does it integrate with?
4. What's driving the change right now?
Check how the readiness analysis works
There are primarily 4 factors that determine the overall score of your system, including code maturity & documentation, business operations complexity, integration criticality and the drivers behind the changes. Highlight below:
- Low scores (< 40%) show low risk, which means the system is cloud fit. It is best to rehost or replatform without rewriting everything from scratch.
- Mid scores (40 to 60%) indicate only to restructure the app with characterization tests. The incremental refactoring technique is the ideal choice here.
- High scores (60 to 80%) mean bit by bit rearchitecturing is the best approach for your system with incremental and uninterrupted migration.
- Very high scores (80%+) point out software criticality. It is better to rebuild or replace selectively while running the old system in parallel.
The Strategy Framework
What are the 7R’s of Legacy System Modernization Services?
We offer the 7R’s of legacy system transformation based on your business needs, starting from legacy application replatforming to complete legacy system replacement. Each strategy comes with different costs, risk analysis, timelines and best usage. Since there is no single modernization switch, often more than one approach is used for better outcomes.
| Strategy | Meaning | Cost Range | Risk | Timeframe | Best When |
|---|---|---|---|---|---|
| 1. Rehost | The lift and shift approach that migrates to cloud without changing its code. | $20,000 to $150,000 | Low | Weeks | When exiting data center rapidly is crucial and the app is good for use. |
| 2. Replatform | The shifting of existing system with simple changes like updated database to new system. | $20,000 to $150,000 | Low | Weeks to months | Looking for cloud benefits like sustainable and well-managed services without recoding. |
| 3. Refactor | Making the code quality better by restructuring and increase its workability. | $150,000 to $300,000 | Medium | 2 to 6 months | When changings are difficult but the app is useful |
| 4. Rearchitect | Update the existing system architecture to API first design and microservices | $300,000 to $500,000+ | Medium to High | 6 to 18 months | When system encounters scaling, agility & integration limits; rearchitecting becomes crucial |
| 5. Rebuild | Completely rewrite the system without altering core business logics | $300,000 to $500,000+ | High | 12 to 24+ months | Left no way to make it better by few changes, rebuild from scratch is critical |
| 6. Replace | Building new applications for commercial & SaaS products while discontinuing the older version | $100,000 to $300,000+ | Medium | Varies | When USPs becomes standard features that existing products already solves |
| 7. Retain (Retire) | Keep the system same for now, deactivate later if not needed | $1,000 to $50,000 | Low | Not Available | The existing app still working enough that current users needs, upgrading may zero return |
Often a mix of strategy frameworks is used. For example, rehost the marketplace apps, refactor the productive apps and rearchitect the strategic core. Confused which approach best fits your system? Take the assessment.
The Decision
Should a Company Modernize, Migrate or Replace a Legacy Application?
In simple words, modernize the software when core logic is alive but the platform has matured; migrate when the app is doing well but not the infrastructure and replace the system when off-the-shelf SaaS products become a better choice than custom code. All decisions are made considering your specific use case.
Modernize
Upgrade Tech while keeping Logic Same
Choose modernization techniques when your application is working but slow, software is hard to operate, relies on a few people for running and the platform is old and less productive. The best is to refactor or rearchitect gradually so system value remains constant without confronting risks.
Migrate
Move the Faultless Part to New System
Choose legacy app modernization services when your system is functional but the infrastructure is not. Facing problems like end of life (EOL) data center, unsupported operating system and high licensing fees. For quick, successful results rehosting and replatforming would be the smart choice.
Replace
Retire it for Something Better
Choose to retire the system when it's not bringing any value! In such cases, mature SaaS products are a better option than custom software development because it's cheaper and doesn’t require maintenance. It's wiser to migrate the data, integrate and deactivate legacy systems.
Our rule of thumb: When business logic is more unique and valuable, you should adopt modernizing instead of replacing systems. And, when the code is old and twisted, you should focus more on phased transitions rather than a full rewrite.
Legacy Application Modernization Services
What Legacy Application Modernization Services Do We Offer?
Trango Tech provides E2E legacy software modernization services, migration and reengineering solutions. All models are designed in a way that matches your business needs, risk tolerance and seamlessly integrates with legacy systems.
Application Refactoring & Reengineering
In our legacy application refactoring and reengineering service, we restructure the source code to maintain app performance and test coverage without changing the core functionality of the software and improve readability.
Cloud Migration and Replatforming
Our experts seamlessly rehost or replatform your application to AWS, Azure or GCP by using containers, managed databases and automatic scaling. This lift, tinker and shift practice cuts the infrastructure and licensing costs.
Monolith to Microservices Re-architecture
We help you revamp your website or application from brittle monoliths into new independent functions or services by using the strangler pattern. No sudden changes, just switch gradually and smartly to improve scalability & performance.
Mainframe & COBOL Modernization
We migrate mainframe, COBOL and AS/400 tasks to the cloud by using automation modernization strategies. This converts old business processes into modern programming languages with a 100% achievement rate.
Database & Data Migration
Our software engineers migrate legacy data from storage systems, such as Oracle, DB2, and Microsoft SQL Server to one or more databases. The process involves 4 steps, including analysis, schema modernization, ETL and Zero RPO.
API Enablement & Integration
We use API enablement processes to empower strong and efficient data flow. Our developers pack your legacy systems' data and business processes via secure interfaces to connect with new products, software programs, platforms and channels.
UI/UX & Frontend Modernization
We design the modern UI/UX and frontend with an attractive display. We replace the outdated styles and legacy interfaces, including Flash, VB6 and WinForms, with highly responsive, interactive and accessible visuals for website and mobile interfaces.
Legacy Software Rebuild
When rewriting becomes mandatory then comes legacy system replacement. Our team reconstructs your outdated existing system from the bottom and rebuilds a completely modern, technical and high performing platform without disrupting current operations.
Modernization Assessment & Roadmap
We offer a fixed scope, strategic plan and budget estimate for your software development. The framework involves legacy code analysis, risk score, updating and streamlining existing systems as per the 7Rs of application modernization.
How We Work
How Do You Modernize Legacy Applications?
Our legacy software modernization services involve 6 stages, including the legacy app assessment, capturing the logic by using characterization tests, the selection of a legacy system transformation technique, side-by-side modernization by the strangler fig pattern, and changeover with seamless uptime to improve speed, embrace new tech and lower cost. We work side-by-side as a parallel run without disrupting your current operations or losing unwritten logic.
01
Assess & Discovery (Weeks 1-3)
We start with an analysis of the portfolio, including an audit of legacy system records, codebase, architecture, data and integrations. We check how your existing application behaves in production and interrogate the individuals running it. Considering the audit report after detailed analysis, we score your program against the 7Rs migration strategies and offer a fixed fee plan.
Deliverables
Get portfolio risk evaluation
Recommended R modernization technique
Incremental cost master plan
02
Characterization Tests (Weeks 4-5)
In order to keep your undocumented operating policies safe, we wrap your legacy code into a characterization test that locks your system's existing behavior on real inputs. This way, all standard business procedures remain the same & make it safely through the upgraded system. We capture data with this golden master testing & mitigate complex systems into an easy form.
Deliverables
You get a behavioral test suite
Clear source code archaeology notes
Data transfer path
03
Choose the Strategy & Plan Phases (Week 6)
The modernization model selection is done as per your budget & business requirements. We implement R strategy to every part of the system and break it down into small phases easy to ship. Each delivery has a defined starting & ending point, so you never end up dealing with two different systems. With fixed migration scope, we maintain behavior parity & block scope creep.
Deliverables
Incremental approach & defined endpoint
Transparent and fixed scope pricing
A stable rollback strategy
04
Modernize Incrementally by Strangler Fig (Month 2-5)
We implement a strangler fig pattern that sits on the data migration route. The facade controls traffic of both old and new systems alongside, until all small or big components are proven in production. Upon successful migration and stable production, the legacy system is retired. Each phase brings value so that users can benefit while the rest of the plan is in process.
Deliverables
All phases are deployable
Simultaneous running process
Get former legacy logs
05
Cut Over with Zero Downtime (Month 6)
By using an autonomous golden standard of data migration and verification with a peak reconciliation strategy, both systems run in parallel. Each feature is tested with a defined user pressure to detect hidden bugs and revert to the old system upon sudden interruptions. By this incremental changes technique, we eliminate the risk of enormous system failure.
Deliverables
Receive data parity report
Identified migration plan
Restoration guidebook
06
Optimize & Support (Ongoing)
After migration, we optimize performance and cloud hosting by strengthening security, training the team on how to use the modernized application and giving continuous maintenance support as per your requirements. Trango Tech provides 100% IP ownership and hands over all relevant documents to you post-go-live.
Deliverables
Get maximum performance & cost tuning
Complete knowledge transfer
Support SLA commitment
Zero Disruption
How to Modernize Legacy Systems without Disrupting Operations?
Stopping the ongoing operations just to modernize the system is a highly risky and big bang approach. That’s why we modernize your live systems by using strangler fig patterns. In this method, each feature is incrementally added by replacing the old one with the updated setup until it is operationally validated in production. With this technique, your legacy system never faces massive failure.
This progressive activity directly answers the most asked question by engineers: that rewriting means stopping running features and maintaining two systems forever. Our phased approach of legacy system modernization services has defined end lines and each piece retires as it lands effectively. In short, the gap between operating both systems side-by-side is a short period.
Parallel Run
Both legacy and upgraded systems are simultaneously operated to compare the results of real users' input, instead of directly relying on new technology.
Feature Flagged Transition
Migrating features progressively using a strangler architecture pattern helps reduce sudden system shutdowns with instant rollback options.
Validated Data Migration
All data records are verified via harmonization and error checking methods. Cutover only takes place when data integrity is ensured and matches 100% of requirements.
Before and After
What Modernization Actually Changes: A typical Before and After
Replacing an aging software system of a typical midsize company via refactor or replatform engagement is the conversion of decades old monolith programs and EOL infrastructures into modern cloud services. This practice keeps your system operational throughout the project duration.
−47%
monthly upkeep
12×
shipping frequency
99.95%
uptime SLO (from 99.2%)
0 min
downtime during conversion
Each number represents the core market engagements, whereas your specific figure depends on your project scope which is customized in the evaluation.
Interactive Tool for Cost Estimator
Free Legacy Modernization Cost Calculator
Legacy software modernization cost varies with your system complexity, the preferred application modernization strategy, investment scale, and other operational factors. Choose the most appropriate options below; we will estimate your project cost in USD considering market values and our 2 decades of experience.
1. Modernization Approach
2. System Complexity
3. How many applications?
4. Add-ons & Constraints
(select all that apply)
How Much Does Legacy Software Modernization Cost?
Our legacy app transformation cost calculator estimates modernization expenses in USD, considering the following 4 aspects:
- Approach contributes as the main factor. Rehosting is the least expensive, ranging from $20k to $60k; replatforming costs approx $40k to $150k, refactoring charges $150k to $300k, and rearchitecture or system rebuild costs $300k to $500k+.
- Complexity represents the number of hours and extra efforts required to modernize your app. The more entangled and paperless the system, the more it will cost.
- Portfolio size lowers the overall cost due to the addition of multiple app programs. With mutual infrastructures and patterns, you just need to plug into what already exists.
- Add-ons add the cost of HIPAA, PCI DSS, & SOC 2 regulations, database migration, mainframe or COBOL workloads, uninterrupted operational requirements and UI modernization. Large enterprise ERP and mainframe solutions typically range between $1M and $10M+.
Usually, legacy software modernization services pay back in 18 to 36 months with 30 to 50% lower maintenance and development costs. Select the unique values of your current system in the tool above. Initiate the process for a fixed quote and assessment starting from $15k to $40k.
Transparent Pricing
How Much Does It Cost to Modernize a Legacy Application?
The legacy system modernization services range from $20,000 for basic cloud migration modernization to over $500,000 for full rebuild service, whereas most projects fall under $20,000 to $150,000 with popular rehosting choice. The range below refers to the current US market, although most modernization projects start with a fixed assessment fee of $15,000 per application.
| Scope | Average Range | Timeframe |
|---|---|---|
| Modernization assessment & roadmap | $15,000 to $40,000 | 2 to 4 weeks |
| Rehost / replatform (per app) | $20,000 to $150,000 | 3 weeks to 3 months |
| Refactor / Partial modernization | $150,000 to $300,000 | 3 to 6 months |
| Re-architecture / full rebuild | $300,000 to $500,000+ | 12 to 24 months |
| Enterprise ERP / mainframe (COBOL) | $1M to $10M+ | 18 to 36 months |
These values represent the US market range for project planning, last updated in August 2026. However, your specific project quote depends on your source code complexity, data volume, integrations and relevant compliance scope.
Security and Compliance
Comply with Regulations Through the Migration Process
Trango Tech adheres to US compliance throughout the cutover during migration. We bolt in security and regulatory requirements in your project skeleton, control mandates, maintain auditable files and meet inspection expectations to operate under HIPAA, GDPR, PCI DSS or SOC 2 obligations.
Encrypted & Validated Data Migration
Comply with data migration law requirements of AES 256 when at rest and secure encryption via TLS for transition. Verified via checksums for parity & done locked migration for zero loss.
Audit Log Continuity
In order to survive the migration process with negligible loss, we run automated reconciliation checks, centralized log management and clear evidential labels for programs running together.
Modern Identity & Access
For robust security, we implement SSO, MFA and least privilege access to keep shared accounts secure for accountability and track each user's activity as a data security measure.
Compliance Mapping & Documentation
Abide by regulations and map the security controls, including HIPAA, PCI DSS, SOC 2 or GDPR. Keep all compliance & audit details documented for auditors from the start.
Proof
Modernization Outcomes We’ve Delivered
As a part of our legacy app modernization services, our developers have transformed complex legacy systems into scalable and modern applications without interrupting live operations. The three highlighted engagements below reflect our engineers' technical efficiency and critical thinking capabilities. Respective client names are under NDA.
Logistics & 3PL
Monolith to Microservices on AWS
National freight & 3PL operator. 4,000+ drivers for US Midwest
National Freight was using a single legacy system to run all three operations, including dispatch, billing and driver payout for an entire enterprise 3rd party logistics provider. This practice risked all three sectors with every release. We analyzed the existing behavior with 1,800+ characterizations and modernized it in 9 months with the strangler fig method into 14 microservices on AWS ECS. The legacy VM was completely shut down by the 10th month.
Refactor + replatform, 9 months, 6 engineers with zero downtime
-42%
infrastructure cost
3.2x
deploy frequency
Banking & Financial Services
COBOL Mainframe to Cloud Core
Regional US bank with approx $4B assets. 40 years of COBOL batch logic
A midsize US bank was doing calculations using an old COBOL programming language and updating over 210M account records every night. The method was too old and engineers capable of understanding the system were very few. We helped their financial services software modernization by transcoding the JAVA rules alongside the parity runs. Our senior developers took 22 months to upgrade the system by using the production data of the past 14 months.
Rearchitect + migrate, 22 months, parity run cutover with sound audit
-55%
annual overhead
210M
records. 0 lost
Healthcare
VB6 Desktop to HIPAA web platform
Multiple clinic healthcare groups in 23 locations with 3k+ active users
Doctor consultation booking and referrals relied on an older Visual Basic 6.0 (VB6) desktop application that required manual installation on each clinic location separately. We remodeled the software as a HIPAA compliant web platform and operated both systems simultaneously for 90 days. By adopting this strategy all clinics upgraded to the new system one by one without any data loss of appointments while complying with BAAs requirements throughout the process.
Rebuild + parallel run for 11 months. HIPAA phased clinic launch
1.5 years
for payback
-38%
maintenance cost
Client Feedback
See What US Leaders Say About Our Services
From the engagements above, explore what customers say about partnering with Trango Tech for legacy system modernization services. Below are highlighted a few of our client voices under NDA with their consent. For full reference, please request the list during the evaluation process.
★★★★★
We came across a concept several times that the dispatch monolith cannot be replaced without completely stopping the system. Trango Tech replaced our legacy system with a new one in 9 months and our drivers didn’t even notice any difference. They parallel ran both systems, slowly shifted to modern and retired the former system. I found this fascinating because most agencies leave firms with both systems running together.
★★★★★
They used the parity run method for our bank legacy system transformation, same as communicated to our auditors. For this, they utilized the past 14 months' production history and modernization was done simultaneously while all changes were explained before migration. My QA team investigated and thoroughly reviewed the process and found no findings against their workflows. In return, our 40 years old COBOL based application transformed into an advanced system.
★★★★★
While partnering with a legacy application modernization company, our biggest fear was losing the scheduled data of our 23 US clinics during the modernization process. Trango Tech moved our old system to the new version within just 90 days without disrupting the ongoing operations. They migrated one clinic's data at a time, which resulted in zero booking loss. The best part we noticed was that none of the front end users felt that switching circumstances were organized on the backend.
Why Trango Tech
Why Choose Trango Tech as Your Legacy Modernization Company?
When you have to choose the legacy app modernization services company, choose wisely! They are responsible for transforming your current system to a new version without stopping your current business processes. For a smooth app transition process, you'd better consider the following pointers while contracting with partners.
/ 01
20+ Years of Experience (1,000+ Applications)
Trango Tech is a US based company, founded in 2004. We have been shipping softwares and modernizing applications for the past 20 years across critical and regulated industries. Our senior engineers have taken into account robust security, high quality coding and infrastructure from the early 2010s.
/ 02
Named Senior Architects
Your modernization app is led by our senior architects from day one. We don’t rotate or hand over tasks to juniors after a contract. Our expert developers have been working in the field for the past 2 decades and have served IT, banking, logistics, healthcare, and manufacturing industries in the USA.
/ 03
Incremental Process with Defined Roadmap
The most common concern of almost all business people is handled by our company contractually. We modernize your legacy system side by side with the new one; this way you never have to face operations being interrupted. After process completion, we retire the old system so that you never have to manage both concurrently.
/ 04
Zero Downtime Delivery
By using techniques like strangler fig, parallel run and progressive feature rollout. You never encounter system downtime, and applications keep running at the same time of modernization. With our transparent working procedure as stated in the SLA, you are never trapped under service downtime.
/ 05
100% Source Code & IP Ownership
You own the code! We transfer complete ownership to you with the completion of the project, including source code, process documentation, and IP rights. As per the shared NDA from day one of the contract. You are free of licensing traps, vendor lock-ins and operational control issues.
/ 06
Transparent & Fixed Scope Pricing
Publicly publishing app modernization prices keeps Trango Tech different from other agencies. We don’t charge you behind the ‘contact to know more details’ bar. Keeping all 7R’s strategies' cost range tiers on the same page with a defined framework, so you don't have any surprises by the end of the project.
Reduce the system risk your business runs on!
Connect with our senior architect for 30 minutes today. We sign the mutual NDA before the first conversation.
Technology
The Modern Stack We Migrate You To
The tech stack we use to modernize your application includes modern languages, frameworks, tools and stable platforms that support software modeling, integration complexity and easy coding understanding. With this approach, your programmer can run the system seamlessly at engagement wrap up.
Cloud & Infrastructure
AWS, Azure, Google Cloud, Docker, Kubernetes, Terraform
Languages & Frameworks
Java or Spring, .NET, Node.js, Python, Go, React, Angular
Data
PostgreSQL, MySQL, MongoDB, Redis, Kafka with migration off Oracle or DB2
DevOps & Quality
CI/CD, automated & characterization testing, observability, IaC
Partnership & certifications: AWS Partner Network, Microsoft Partner, ISO 27001, and SOC 2 Type II
Industries
Modernization Experience Across Regulated Industries
Shaping the real world complex applications with our legacy modernization strategies. Often, regulated industries keep using the same old software because adapting new technologies is risky. Each industry below has its own compliance framework, critical operations and limitations. Enlisted all typical lacking and modernization needs for all critical sectors without interrupting daily operations.
Banking & Financial Services
PCI DSSSOC
2GLBAFFIEC
Often banks rely on legacy COBOL systems because of critical and heavy financial management. Only retired engineers can understand and operate them, which raises the need for app modernization. Our expert engineers modernize your existing system alongside upgrading the new model with parity. The process runs through your production history, so your auditors and risk committee get a clear picture of before and after changes with proof.
We modernize mainframe cores, loan origination, payment systems and night shift tasks
Healthcare & Life Sciences
HIPAABAAsHL7
/ FHIR
It is hard for clinics and administrative tools to meet the interoperability and data privacy level of the digital world with old desktop apps made in the early 2000s. We migrate encrypted data and modernize telehealth apps considering HIPAA compliant web platforms while keeping BAAs in place. Adhere to HL7/FHIR interfaces and run both systems at the same time so you never lose scheduled data.
We modernize VB6/WinForms clinical tools, local patients’ portal, scheduling & referral systems
Logistics & Supply Chain
24/7
operationsEDIAPI-led
Logistics and transportation run non-stop dispatch, billing and settlement tasks at the same time. In such cases, migration sounds almost impossible because of interlinked operations. We use the strangler fig method and feature-flagged release method to ensure systems swap without missing a single live load during the modernization process or transportation and warehouse management system.
We modernize TMS and WMS monoliths, EDI integration layers, dispatch & settlement systems
Retail & eCommerce
PCI DSSPeak season SLOs
The retail and eCommerce sectors have legacy order management systems (OMS) that face crashes because old technology cannot operate smoothly and efficiently when the store booms with major sales, especially during peak seasons. We rearchitect an omnichannel platform for dynamic scaling, supply chain automation, separate checkouts, inventory and order fulfillment. This practice turns your shopping platforms' Black Friday sales into measurable events.
We modernize order management, legacy POS backends, monolithic storefronts & inventory systems
Manufacturing
OT/IT
integrationMES
/ ERP
Often the factory floor and manufacturing execution system (MES) rely on unsupported versions of Windows Embedded or Windows IoT. These manufacturing processes are bound to fragile, wired and complex ERP customization that no one dares to interface with, as it will directly impact the business. We modernize production schedules one by one with rollback options at every step so that you never face hurdles in live production.
We modernize MES & shop floor apps, ERP customization, plant reporting and SCADA adjacent systems
Insurance
AS/400Actuarial
paritySOC2
The policy administration and claim processing systems are very complex as they are the digital brain of the insurance companies encoded with old underwriting guidelines. For insurance platform modernization, we use characterization tests to hold the core logic firmly before actually starting to migrate data to the new model. This way heavy financial claims and premiums are calculated the exact same as on older programs, leaving no approximations behind.
We modernize policy admin on AS/400, claims processing, rating engines & agent portals
Government & Public Sector
Section
508NIST alignedFixed scope
Legacy government system apps like tax filing or public housing are built on an aged stack, due to which they fail both accessibility assessments and security reviews. We modernize these customer-facing government apps and public sector applications from outdated technical architecture to buying friendly defined stages, Section 508 accessible interfaces and conform to NIST compliance for measurable security controls.
We modernize citizen service portals, case management, records systems & internal workflow apps
Energy & Utilities
NERC
CIP awareHigh
availability
The core software runs billing, outage management system (OMS) and field service management (FSM) of power grid systems running 365 days. These energy and utilities software are supposed to work 24/7. To ensure seamless operations without disruptions, we modernize the system during quiet hours so daily processes are not influenced. While running both systems at the same time, our team abides by NERC CIP compliance and controls.
We modernize building engines, outage management, field service dispatch and metering data system
An Honest Take
When You Should Not Modernize an App
A sincere US app development partner will be honest with you when it comes to offering legacy application modernization services. If your existing system is stable, budget friendly, free standing and does not stop you from enterprise growth sessions, then it is better to retain your legacy system and invest where it brings value to your business. If people using your app are countable on their fingers, then it is better to retire it and modernize your app. And if mature SaaS products perform operations smoothly and quickly, then it is better than a custom build; choose to replace the system instead of modernizing it.
Be Alert! US proprietors and owners should ask themselves before investing: why modernize legacy systems? Often, agencies try to trap you into a complete system rewrite which leads to a big capital injection of a complex and poorly managed system without any strategies and test coverage. They opt for feature freezing which affects your current operation. Trango Tech only recommends rebuilding when your legacy system is actually dying; otherwise, most of our engagement is based on fixing performance gaps with incremental modernization techniques. We modernize your former system side by side so that it can be used without disrupting live operations.
FAQ
Legacy Application Modernization Services Questions Answered
You can find below the most asked questions by IT leaders and senior engineers for app modernization. Each question is answered by our experienced senior architect, not the marketing team.
Legacy application modernization is the process in which old systems are transformed into new ones. The method involves working on architecture, code, infrastructure and data migration so that it can smoothly run operations on cloud based platforms without breaking your business core logic. There are 7 different methods, ranging from cloud rehost to a complete rearchitecting into microservices. The strategy is chosen based on the risk, cost and downtime threshold of our application.
Businesses should modernize legacy applications to save budget and cut down the maintenance cost. As per Garnet, about 80% of the IT budget is invested in maintaining legacy systems and it takes 30% to 50% of the budget in system maintenance. These EOL platform alarms update security and compliance requirements; aged technology slows down processing speed and is hard to maintain, as only retired individuals are experts in legacy technology. Save on maintenance costs and invest where it brings value; ship app features quickly.
To streamline your business operations, we use techniques like the strangler fig pattern, parallel runs, and feature flagged releases. By following this strategy, your system stays alive throughout the modernization process. We upgrade your system step by step with quick rollback options to eliminate the risk of maintenance shutdown scenarios.
There are 6Rs and 7Rs of application modernization strategies, including rehost, replatform, refactor, rearchitect, rebuild, replace and retire. Rehost is used for lift and shift, replatform for basic cloud changes, refactor to improve code quality, rearchitect to give shape to existing architecture like microservices, rebuild to rewrite the existing system while preserving business core logic, replace when a SaaS product is good to go and retire when the existing system is close to shutdown. Often firms choose more than one technique; see the comparison table above.
Legacy system modernization typically falls in the range of $20,000 to $500,000+, covering from basic cloud migration modernization to full rebuild services. The rehost and replatform ranges between $20k and $150k per app, refactor $150k to $300k, restructuring or rebuild $300k to $500k+ and enterprise ERP or mainframe programs from $1M to $10M+. Often, engagement starts with $15k to $40k. You can use our cost calculator to get a personalized estimate.
Companies considering legacy application modernization should assess partners' deep architectural proficiency, endurance during audit pressure, risk management strategies and portfolio. If they have done it before, they will surely mention the approach strategy as per your system condition, tech debt, migration tests, data readiness, staged rollout and documentation gaps instead of just code rewriting suggestions.
The benefits associated with legacy application modernization are cost savings, improved system efficiency, data readiness, better user interface, enhanced security and advanced feature upgrades. US enterprises are rapidly shifting towards modernizing their outdated systems with new technology for cloud computing, better decision making based on live data, higher conversion and automated operations.
Get Started
Get Your FREE Modernization Assessment
Share your legacy system details with us. Our senior architect will connect with you after reviewing your request with the best approach: migrate, replace or modernize recommendation along with a budget and incremental roadmap. Feel FREE to reach out to us; no pressure and no automatic retainer here!
How to Get Started
- Schedule a 30 minutes session with our senior architect
- Sign the mutual NDA before any confidential data is shared
- Get a fixed fee assessment plan within 48 hours
- Receive a phased plan with transparent pricing to decide
Mutual NDA signed before project scoping call
You get 100% source code and IP ownership
Get a defined roadmap from start to finish
Plan consists of phased delivery and zero downtime
Adherence to compliance throughout the process
Headquarters
1923 Washington Ave
Houston, TX 77007, United States
Houston, TX 77007, United States
