Legacy Application Modernization Companies
A neutral roster of companies delivering legacy application modernization — listed alphabetically, never ranked or scored. Paid Featured placements are labeled and do not change the ordering. Compare each firm's type, team size, specialization, and location, then open a profile for the full detail.
34 companies below work on engagements in this domain. Each profile covers their specialty, the buyers they fit best, team size, and location.
Market map
Companies to evaluate for Legacy Application Modernization
Scope: published legacy application modernization companies with documented category, migration-path, or service evidence in this research domain.
Last evaluated
201
Published modernization companies reviewed
34
Companies shown for legacy application modernization
Inclusion criteria: A company must have a published profile and documented category, migration-path, or service evidence in this domain. See the evidence threshold in our research methodology.
How to choose: Start with documented buyer fit (29 profiles) and specialty evidence (29), then narrow by team size (29) and location (29). Open a profile to verify the underlying experience before shortlisting.
This is an alphabetical market map, not an ordinal ranking. Paid Featured placements are labeled and do not imply a recommendation.
Legacy application modernization requires different suppliers for different intervention paths. Platforms and tools support portfolio discovery, code analysis, automated transformation, testing, observability, and target runtimes; consultancies and integrators design and deliver rehost, replatform, refactor, rearchitect, replace, retain, or retire programs. Compare tools by language coverage, output maintainability, runtime lock-in, and validation controls. Compare delivery partners by legacy-stack expertise, target-architecture capability, comparable program evidence, team scale, and location. The roster is alphabetical because provider fit changes with the selected path.
Compare legacy application modernization companies
How this list works: Neutral comparison — companies are listed alphabetically, not ranked, scored, or rated. “Featured” placements are labeled paid slots and do not imply a recommendation.
| Vendor | Case studies | ||||
|---|---|---|---|---|---|
| 10Clouds | Agency | Mid-size | Fintech & Banking | Poland | 60 |
| Accenture | Agency | Enterprise | Industrial scale Java modernization | Global | 500 |
| Amazon Q Developer | Platform | — | — | — | 0 |
| Arkency | Agency | Boutique | Domain-Driven Design | Poland | 40 |
| Backstage | Platform | — | — | — | 0 |
| Belitsoft | Agency | Enterprise | Cost-Effective Outsourcing | Poland | 100 |
| Beyond Code | Agency | Boutique | Developer Tooling | Germany | 20 |
| BigBinary | Agency | Mid-size | React Integration | USA | 60 |
| Capgemini | Agency | Enterprise | Cloud-native transformation | Global (France HQ) | 350 |
| Codeminer42 | Agency | Mid-size | Staff Augmentation | Brazil | 90 |
| Evil Martians | Agency | Boutique | Performance & Tooling | USA | 60 |
| FastRuby.io | Agency | Boutique | Pure Upgrades | USA | 150 |
| GitHub Copilot | Platform | — | — | — | 0 |
| Globant | Agency | Enterprise | Scalable digital platforms | Global (Argentina Origins) | 300 |
| Hashrocket | Agency | Boutique | Legacy Rescue | USA | 80 |
| Iflexion | Agency | Enterprise | Complex Integrations | USA | 150 |
| Infosys | Agency | Enterprise | Automated migration tools | Global (India HQ) | 550 |
| Kirschbaum | Agency | Mid-size | Staff Augmentation | USA | 45 |
| Nearform | Agency | Mid-size | Node.js and cloud-native performance | Global | 40 |
| OpenRewrite | Platform | — | — | — | 0 |
| Planet Argon | Agency | Boutique | Long-term Maintenance | USA | 50 |
| Reinteractive | Agency | Mid-size | Fixed-Price Audits | Australia | 70 |
| RuboCop Rails | Platform | — | — | — | 0 |
| Saeloun | Agency | Boutique | Bleeding Edge Rails | USA | 30 |
| Scalo | Agency | Mid-size | Team Scaling | Poland (Global) | 42 |
| ScienceSoft | Agency | Mid-size | Healthcare & HIPAA | USA / Europe | 90 |
| Slalom | Agency | Enterprise | Modern engineering | USA / Global | 300 |
| Spatie | Agency | Boutique | Domain-Driven Design & Packages | Belgium | 50 |
| TCS | Agency | Enterprise | MasterCraft modernization suite | Global (India HQ) | 800 |
| Thoughtbot | Agency | Mid-size | Code Quality & Testing | USA | 100 |
| Thoughtworks | Agency | Enterprise | Inventors of 'Microservices' concepts | Global | 200 |
| Tighten | Agency | Boutique | Enterprise Consulting | USA | 35 |
| Vehikl | Agency | Mid-size | Mob Programming & TDD | Canada | 40 |
| Wipro | Agency | Enterprise | App modernization and cloud migration | Global | 350 |
Platforms & tools
Software products and platforms used to execute or accelerate work in this domain.
AngularJS to React migration guidance and component scaffolding
Service catalog and developer portal for managing microservices inventory
Conditional Access policy JSON and PowerShell migration script generation
Automated C# and .NET code refactoring recipes
Automated Rails cop enforcement — catches deprecated patterns
Consultancies & integrators
Delivery partners that assess, implement, migrate, and operate modernization programs.
Warsaw-based AI-focused software house founded in 2009 with 49 engineers delivering full-stack solutions to fintech, blockchain, and enterprise clients. 95 projects completed across 18 countries; ~90% of client reviews highlight on-time delivery, strong project management, and technical depth.
Accenture is a global professional services powerhouse with deep expertise in mainframe modernization. They combine strategic consulting with massive execution scale, leveraging partnerships with all major cloud providers. Their "myNav" platform helps chart the best migration path.
An established software development company with a strong department dedicated to PHP and Laravel migration services.
Capgemini is a global leader in partnering with companies to transform and manage their business by harnessing the power of technology. Their "Economic Application Modernization" approach focuses on optimizing costs while migrating legacy workloads to the cloud.
Globant focuses on "Reinventing businesses." They heavily utilize AI (Augmented Coding) to accelerate the understanding and refactoring of legacy code. They are an excellent choice for modernizations that are driven by a need to improve customer experience (CX).
A global software development company providing full-cycle web and mobile development services, including legacy modernization.
Infosys Cobalt is a leading set of services, solutions, and platforms for enterprises to accelerate their cloud journey. Their Modernization Suite includes over 40 services and aims to reduce development efforts by up to 40% using proprietary AI-driven tools.
Nearform specializes in building high-performance digital products and platforms. They are experts in Developer Experience (DevEx) and open-source technologies.
Specialists in Ruby on Rails maintenance and upgrades. They focus almost exclusively on taking over and improving existing legacy Rails apps.
Scalo is a software house specializing in legacy modernization and cloud migration.
ScienceSoft is a US-headquartered provider of IT consulting and software development services. With a strong track record in healthcare and other regulated industries, they offer practical modernization services ranging from code refactoring to complete re-engineering. They are known for their pragmatic and reliable delivery.
Slalom focuses on a "strategy-first" approach. They are excellent at aligning the business case for modernization with the technical execution. They have deep partnerships with AWS, Azure, and Google Cloud.
Tata Consultancy Services (TCS) operates at massive scale. Their "MasterCraft" suite leverages intelligent automation and GenAI to modernize legacy applications. They are currently migrating over 50 million lines of COBOL to Java for a single financial client.
One of the most respected Rails consultancies in the world, known for their open source contributions (FactoryBot, Paperclip) and high code quality standards.
Thoughtworks pioneered many of the patterns used in modern software development, including the "Strangler Fig" pattern for legacy modernization. They are the premium choice for complex, strategic re-architecting where code quality and domain alignment are paramount.
Wipro is a leading global information technology, consulting, and business process services company. Their "Wipro FullStride Cloud Services" combines industry depth, cloud expertise, and a comprehensive suite of tools to accelerate modernization. They emphasize an automated, pattern-based approach to migration.
What each company specializes in
- 10Clouds(Agency)
Fintech & Banking
Best for: Compliance-heavy applications
MidSize · Poland
- Accenture(Agency)
Industrial scale Java modernization
Best for: Global 2000 enterprises with massive fleets
Enterprise · Global
- Amazon Q Developer(Platform)
AngularJS to React migration guidance and component scaffolding
- Arkency(Agency)
Domain-Driven Design
Best for: Refactoring complex monoliths during the upgrade
Boutique · Poland
- Backstage(Platform)
Service catalog and developer portal for managing microservices inventory
- Belitsoft(Agency)
Cost-Effective Outsourcing
Best for: Budget-conscious migrations
Enterprise · Poland
- Beyond Code(Agency)
Developer Tooling
Best for: Projects requiring custom migration tooling
Boutique · Germany
- BigBinary(Agency)
React Integration
Best for: Apps heavily using React that need to coexist with Rails 7
MidSize · USA
- Capgemini(Agency)
Cloud-native transformation
Best for: Moving from on-prem to Cloud Foundry/K8s
Enterprise · Global (France HQ)
- Codeminer42(Agency)
Staff Augmentation
Best for: Adding senior capacity to your existing team
MidSize · Brazil
- Evil Martians(Agency)
Performance & Tooling
Best for: High-scale apps needing performance tuning alongside the upgrade
Boutique · USA
- FastRuby.io(Agency)
Pure Upgrades
Best for: Outsourcing the tedious upgrade work to specialists
Boutique · USA
- GitHub Copilot(Platform)
Conditional Access policy JSON and PowerShell migration script generation
- Globant(Agency)
Scalable digital platforms
Best for: Consumer-facing high-traffic apps
Enterprise · Global (Argentina Origins)
- Hashrocket(Agency)
Legacy Rescue
Best for: Rescuing projects that have already failed an upgrade attempt
Boutique · USA
- Iflexion(Agency)
Complex Integrations
Best for: Enterprise apps with many 3rd party integrations
Enterprise · USA
- Infosys(Agency)
Automated migration tools
Best for: Cost-effective code conversion
Enterprise · Global (India HQ)
- Kirschbaum(Agency)
Staff Augmentation
Best for: US-based teams needing immediate expert help
MidSize · USA
- Nearform(Agency)
Node.js and cloud-native performance
Best for: High-performance backend modernization
MidSize · Global
- OpenRewrite(Platform)
Automated C# and .NET code refactoring recipes
- Planet Argon(Agency)
Long-term Maintenance
Best for: Taking over maintenance after the upgrade is done
Boutique · USA
- Reinteractive(Agency)
Fixed-Price Audits
Best for: Getting a clear roadmap and cost estimate before starting
MidSize · Australia
- RuboCop Rails(Platform)
Automated Rails cop enforcement — catches deprecated patterns
- Saeloun(Agency)
Bleeding Edge Rails
Best for: Adopting the absolute latest Rails features immediately
Boutique · USA
- Scalo(Agency)
Team Scaling
Best for: Rapidly scaling development capacity
MidSize · Poland (Global)
- ScienceSoft(Agency)
Healthcare & HIPAA
Best for: Healthcare applications requiring strict compliance
MidSize · USA / Europe
- Slalom(Agency)
Modern engineering
Best for: Agile transformation
Enterprise · USA / Global
- Spatie(Agency)
Domain-Driven Design & Packages
Best for: Complex domain logic and high-quality codebases
Boutique · Belgium
- TCS(Agency)
MasterCraft modernization suite
Best for: Risk-averse, tool-assisted migration
Enterprise · Global (India HQ)
- Thoughtbot(Agency)
Code Quality & Testing
Best for: Teams that want to improve their testing culture while upgrading
MidSize · USA
- Thoughtworks(Agency)
Inventors of 'Microservices' concepts
Best for: Complex domain modeling (DDD)
Enterprise · Global
- Tighten(Agency)
Enterprise Consulting
Best for: Large-scale refactoring and team training
Boutique · USA
- Vehikl(Agency)
Mob Programming & TDD
Best for: Reskilling your internal team while migrating
MidSize · Canada
- Wipro(Agency)
App modernization and cloud migration
Best for: End-to-end infrastructure + app migration
Enterprise · Global