Top 32 Legacy Application Modernization Companies (2026)

Selection rule: every company below is one this site holds a research record for in legacy application modernization — a documented migration path, a service engagement, or a hub-scoped vendor profile — and the 32 that qualify are listed alphabetically, never ranked or scored. Paid Featured placements are labeled and do not change the ordering.

Approach labels below use the seven modernization options — when to rehost, replatform, refactor, or rebuild a legacy application.

Updated 4 August 2026·Peter Korpak·Methodology

Compare legacy application modernization companies

Filter by what a company migrates from, its modernization approach, supplier type, team size, or region. Listed alphabetically — never ranked, scored, or rated. “Featured” is a labeled paid slot and does not change the ordering.

Migrates from:

Approach:

Supplier type:

Team size:

Region:

Legacy Application Modernization company comparison: source stack, approach, supplier type, team size, region, and documented evidence
Company	Approach	Type	Team size	Region
10Clouds	Approach RefactorRewrite	TypeAgency	Team sizeMid-size	RegionPoland	Documented evidence1 documented source
Accenture	Approach RefactorRewrite	TypeAgency	Team sizeEnterprise	RegionGlobal	Documented evidence2 documented sources
Arkency	Approach Refactor	TypeAgency	Team sizeBoutique	RegionPoland	Documented evidence1 documented source
Backstage	Approach—	TypePlatform	Team size—	Region—	Documented evidence0 documented sources
Belitsoft	Approach RefactorRewrite	TypeAgency	Team sizeEnterprise	RegionPoland	Documented evidence1 documented source
Beyond Code	Approach RefactorRewrite	TypeAgency	Team sizeBoutique	RegionGermany	Documented evidence1 documented source
BigBinary	Approach Refactor	TypeAgency	Team sizeMid-size	RegionUSA	Documented evidence1 documented source
Capgemini	Approach Refactor	TypeAgency	Team sizeEnterprise	RegionGlobal (France HQ)	Documented evidence1 documented source
Codeminer42	Approach Refactor	TypeAgency	Team sizeMid-size	RegionBrazil	Documented evidence1 documented source
Evil Martians	Approach Refactor	TypeAgency	Team sizeBoutique	RegionUSA	Documented evidence1 documented source
FastRuby.io	Approach Refactor	TypeAgency	Team sizeBoutique	RegionUSA	Documented evidence1 documented source
Globant	Approach RefactorRewrite	TypeAgency	Team sizeEnterprise	RegionGlobal (Argentina Origins)	Documented evidence1 documented source
Hashrocket	Approach Refactor	TypeAgency	Team sizeBoutique	RegionUSA	Documented evidence1 documented source
Iflexion	Approach RefactorRewrite	TypeAgency	Team sizeEnterprise	RegionUSA	Documented evidence1 documented source
Infosys	Approach Refactor	TypeAgency	Team sizeEnterprise	RegionGlobal (India HQ)	Documented evidence1 documented source
Kirschbaum	Approach RefactorRewrite	TypeAgency	Team sizeMid-size	RegionUSA	Documented evidence1 documented source
Nearform	Approach RefactorRewrite	TypeAgency	Team sizeMid-size	RegionGlobal	Documented evidence1 documented source
OpenRewrite	Approach Refactor	TypePlatform	Team size—	Region—	Documented evidence0 documented sources
Planet Argon	Approach Refactor	TypeAgency	Team sizeBoutique	RegionUSA	Documented evidence1 documented source
Reinteractive	Approach Refactor	TypeAgency	Team sizeMid-size	RegionAustralia	Documented evidence1 documented source
RuboCop Rails	Approach—	TypePlatform	Team size—	Region—	Documented evidence0 documented sources
Saeloun	Approach Refactor	TypeAgency	Team sizeBoutique	RegionUSA	Documented evidence1 documented source
Scalo	Approach RefactorRewrite	TypeAgency	Team sizeMid-size	RegionPoland (Global)	Documented evidence1 documented source
ScienceSoft	Approach RefactorRewrite	TypeAgency	Team sizeMid-size	RegionUSA / Europe	Documented evidence1 documented source
Slalom	Approach RefactorRewrite	TypeAgency	Team sizeEnterprise	RegionUSA / Global	Documented evidence1 documented source
Spatie	Approach RefactorRewrite	TypeAgency	Team sizeBoutique	RegionBelgium	Documented evidence1 documented source
TCS	Approach Refactor	TypeAgency	Team sizeEnterprise	RegionGlobal (India HQ)	Documented evidence1 documented source
Thoughtbot	Approach Refactor	TypeAgency	Team sizeMid-size	RegionUSA	Documented evidence1 documented source
Thoughtworks	Approach RefactorRewrite	TypeAgency	Team sizeEnterprise	RegionGlobal	Documented evidence1 documented source
Tighten	Approach RefactorRewrite	TypeAgency	Team sizeBoutique	RegionUSA	Documented evidence1 documented source
Vehikl	Approach RefactorRewrite	TypeAgency	Team sizeMid-size	RegionCanada	Documented evidence1 documented source
Wipro	Approach Refactor	TypeAgency	Team sizeEnterprise	RegionGlobal	Documented evidence1 documented source

“Documented evidence” counts the migration paths and services in this domain where we hold a relationship record for that company — each one links to the page it came from, under the company’s entry below.

Approach matrix

How Legacy Application Modernization companies map to modernization approach

Rows group legacy application modernization companies by modernization approach, defined in our 7 Rs of application modernization framework; columns separate product vendors from delivery firms.

Refactor is the most common approach here, documented by 30 of 32 companies in legacy application modernization. Product vendors and delivery firms both cluster in Refactor.
Approach	Product	Delivery firm
Rehostsame code, new infrastructure or emulator	ProductNone documented	Delivery firmNone documented
Replatformsame core code, swapped runtime or managed services	ProductNone documented	Delivery firmNone documented
Refactorthe existing code is converted or restructured in place	Product OpenRewrite	Delivery firm 10Clouds Accenture Arkency Belitsoft Beyond Code BigBinary Capgemini Codeminer42 Evil Martians FastRuby.io Globant Hashrocket Iflexion Infosys Kirschbaum Nearform Planet Argon Reinteractive Saeloun Scalo ScienceSoft Slalom Spatie TCS Thoughtbot Thoughtworks Tighten Vehikl Wipro
Rewriterebuilt from scratch on a new architecture	ProductNone documented	Delivery firm 10Clouds Accenture Belitsoft Beyond Code Globant Iflexion Kirschbaum Nearform Scalo ScienceSoft Slalom Spatie Thoughtworks Tighten Vehikl
Replaceswapped for a commercial or SaaS product	ProductNone documented	Delivery firmNone documented
Retain & optimizekept in place and improved	ProductNone documented	Delivery firmNone documented

2 companies are not plotted: no documented approach evidence.

What each company delivers in legacy application modernization

One entry per company, carrying only attributes we can point at a source for. Where a company has no published evidence for an attribute, nothing is shown rather than a placeholder.

10Clouds
Agency
Warsaw-based 10Clouds, a 49-engineer software house founded in 2009, concentrates its PHP-to-Laravel migration work in fintech and banking, positioned for compliance-heavy applications.
RefactorRewrite
Best for
Compliance-heavy applications
Modernizes
PHP to Laravel
Firm profile
Mid-size · Poland
Documented in
PHP to Laravel Migration Services
Accenture
Agency
Accenture applies its own myNav platform to chart the migration path for both Java EE-to-Spring Boot conversions and monolith-to-microservices decompositions, aimed at Global 2000 enterprises decoupling at large scale.
RefactorRewrite
Best for
Global 2000 enterprises with massive fleets
Modernizes
Java EE, Monolith to Spring Boot, Microservices
Firm profile
Enterprise · Global
Documented in
Java EE to Spring Boot Migration Services, Monolith to Microservices Migration Services
Arkency
Agency
Complex monoliths get refactored using domain-driven design as part of Arkency's Rails 7 upgrade work, rather than treated as a separate cleanup step afterward.
Refactor
Best for
Refactoring complex monoliths during the upgrade
Modernizes
Ruby on Rails 4–6 to Ruby on Rails 7
Firm profile
Boutique · Poland
Documented in
Ruby on Rails Upgrade Services
Backstage
Platform
Backstage is an open-source developer-portal framework, originally built by Spotify, organized around a software catalog for service ownership and CI/CD status rather than any migration capability. The self-hosted version still requires a team to build and host its own plugins rather than running as turnkey SaaS.
Belitsoft
Agency
Belitsoft runs a department built specifically for PHP-to-Laravel migration, marketed as the budget-conscious, cost-effective outsourcing option rather than a premium-priced engagement.
RefactorRewrite
Best for
Budget-conscious migrations
Modernizes
PHP to Laravel
Firm profile
Enterprise · Poland
Documented in
PHP to Laravel Migration Services
Beyond Code
Agency
Beyond Code builds custom tooling for its PHP-to-Laravel migrations, aimed at projects whose conversion needs go beyond what an off-the-shelf script can handle.
RefactorRewrite
Best for
Projects requiring custom migration tooling
Modernizes
PHP to Laravel
Firm profile
Boutique · Germany
Documented in
PHP to Laravel Migration Services
BigBinary
Agency
BigBinary's Rails 7 upgrade work is built for apps heavily invested in React, focused on keeping React working alongside the upgraded Rails backend rather than replacing it.
Refactor
Best for
Apps heavily using React that need to coexist with Rails 7
Modernizes
Ruby on Rails 4–6 to Ruby on Rails 7
Firm profile
Mid-size · USA
Documented in
Ruby on Rails Upgrade Services
Capgemini
Agency
Capgemini runs its Java EE-to-Spring Boot conversions under an 'Economic Application Modernization' approach, aimed at on-premise workloads moving to Cloud Foundry or Kubernetes while optimizing run cost.
Refactor
Best for
Moving from on-prem to Cloud Foundry/K8s
Modernizes
Java EE to Spring Boot
Firm profile
Enterprise · Global (France HQ)
Documented in
Java EE to Spring Boot Migration Services
Codeminer42
Agency
Codeminer42 treats the Rails 4-to-7 upgrade as staff augmentation, adding senior engineering capacity to an existing team rather than running the work as a standalone project.
Refactor
Best for
Adding senior capacity to your existing team
Modernizes
Ruby on Rails 4–6 to Ruby on Rails 7
Firm profile
Mid-size · Brazil
Documented in
Ruby on Rails Upgrade Services
Evil Martians
Agency
Performance tuning and tooling work travel with Evil Martians' Rails 7 upgrades, aimed at high-scale applications that need more than a version bump.
Refactor
Best for
High-scale apps needing performance tuning alongside the upgrade
Modernizes
Ruby on Rails 4–6 to Ruby on Rails 7
Firm profile
Boutique · USA
Documented in
Ruby on Rails Upgrade Services
FastRuby.io
Agency
FastRuby.io focuses exclusively on the mechanics of the Rails 4-to-7 upgrade itself, positioned for teams that want to outsource that tedious work to specialists.
Refactor
Best for
Outsourcing the tedious upgrade work to specialists
Modernizes
Ruby on Rails 4–6 to Ruby on Rails 7
Firm profile
Boutique · USA
Documented in
Ruby on Rails Upgrade Services
Globant
Agency
Globant applies its Augmented Coding AI tooling to speed up legacy-code understanding ahead of monolith-to-microservices moves, aimed at consumer-facing platforms handling high traffic.
RefactorRewrite
Best for
Consumer-facing high-traffic apps
Modernizes
Monolith to Microservices
Firm profile
Enterprise · Global (Argentina Origins)
Documented in
Monolith to Microservices Migration Services
Hashrocket
Agency
Hashrocket specializes in legacy rescue, brought in after a prior Rails 7 upgrade attempt has already failed rather than starting from a clean codebase.
Refactor
Best for
Rescuing projects that have already failed an upgrade attempt
Modernizes
Ruby on Rails 4–6 to Ruby on Rails 7
Firm profile
Boutique · USA
Documented in
Ruby on Rails Upgrade Services
Iflexion
Agency
Enterprise applications with many third-party integrations are Iflexion's stated fit for PHP-to-Laravel migration, delivered inside its broader full-cycle web and mobile development practice.
RefactorRewrite
Best for
Enterprise apps with many 3rd party integrations
Modernizes
PHP to Laravel
Firm profile
Enterprise · USA
Documented in
PHP to Laravel Migration Services
Infosys
Agency
Infosys frames its Java EE-to-Spring Boot conversions as a cost-effective, automated migration path under its Cobalt platform, rather than a fully bespoke code rewrite.
Refactor
Best for
Cost-effective code conversion
Modernizes
Java EE to Spring Boot
Firm profile
Enterprise · Global (India HQ)
Documented in
Java EE to Spring Boot Migration Services
Kirschbaum
Agency
Kirschbaum delivers PHP-to-Laravel migration through staff augmentation, aimed at US-based teams needing immediate expert help rather than a fully outsourced project.
RefactorRewrite
Best for
US-based teams needing immediate expert help
Modernizes
PHP to Laravel
Firm profile
Mid-size · USA
Documented in
PHP to Laravel Migration Services
Nearform
Agency
Node.js and cloud-native performance anchor Nearform's monolith-to-microservices work, drawn from a wider practice in high-performance digital products and open-source Developer Experience tooling.
RefactorRewrite
Best for
High-performance backend modernization
Modernizes
Monolith to Microservices
Firm profile
Mid-size · Global
Documented in
Monolith to Microservices Migration Services
OpenRewrite
Platform
An open-source refactoring engine that applies versioned recipes to mechanical framework and dependency upgrades in Java and Spring codebases, though running it across hundreds of repositories without Moderne's commercial platform means orchestrating the CLI yourself.
Refactor
Planet Argon
Agency
Planet Argon focuses almost exclusively on taking over existing legacy Rails apps, pairing the Rails 7 upgrade with long-term maintenance once the migration is done.
Refactor
Best for
Taking over maintenance after the upgrade is done
Modernizes
Ruby on Rails 4–6 to Ruby on Rails 7
Firm profile
Boutique · USA
Documented in
Ruby on Rails Upgrade Services
Reinteractive
Agency
Reinteractive opens its Rails 7 upgrade engagements with a fixed-price audit, giving clients a roadmap and cost estimate before any migration work starts.
Refactor
Best for
Getting a clear roadmap and cost estimate before starting
Modernizes
Ruby on Rails 4–6 to Ruby on Rails 7
Firm profile
Mid-size · Australia
Documented in
Ruby on Rails Upgrade Services
RuboCop Rails
Platform
RuboCop Rails is a community-maintained lint extension, split out of RuboCop core in 2018, that flags deprecated APIs and unsafe patterns in codebases running Rails 4.2 or newer. It surfaces what needs fixing during an upgrade but leaves the actual code changes to a developer.
Saeloun
Agency
Saeloun frames its Rails upgrade work around adopting bleeding-edge Rails 7 features immediately, rather than a conservative, wait-and-see migration.
Refactor
Best for
Adopting the absolute latest Rails features immediately
Modernizes
Ruby on Rails 4–6 to Ruby on Rails 7
Firm profile
Boutique · USA
Documented in
Ruby on Rails Upgrade Services
Scalo
Agency
Scalo's PHP-to-Laravel migrations are framed around team scaling, rapidly adding development capacity, inside its wider legacy modernization and cloud migration practice.
RefactorRewrite
Best for
Rapidly scaling development capacity
Modernizes
PHP to Laravel
Firm profile
Mid-size · Poland (Global)
Documented in
PHP to Laravel Migration Services
ScienceSoft
Agency
Healthcare is where ScienceSoft concentrates its PHP-to-Laravel migrations, built for HIPAA-regulated applications that need strict compliance.
RefactorRewrite
Best for
Healthcare applications requiring strict compliance
Modernizes
PHP to Laravel
Firm profile
Mid-size · USA / Europe
Documented in
PHP to Laravel Migration Services
Slalom
Agency
Slalom leads its monolith-to-microservices delivery with a strategy-first business case, backed by partnerships across AWS, Azure, and Google Cloud rather than a single-cloud playbook.
RefactorRewrite
Best for
Agile transformation
Modernizes
Monolith to Microservices
Firm profile
Enterprise · USA / Global
Documented in
Monolith to Microservices Migration Services
Spatie
Agency
Spatie applies domain-driven design and a packages-based approach to PHP-to-Laravel migrations, aimed at complex domain logic rather than a straightforward framework swap.
RefactorRewrite
Best for
Complex domain logic and high-quality codebases
Modernizes
PHP to Laravel
Firm profile
Boutique · Belgium
Documented in
PHP to Laravel Migration Services
TCS
Agency
TCS positions its MasterCraft suite as the tool-assisted path for Java EE-to-Spring Boot conversions, aimed at risk-averse enterprises that want automation handling the conversion rather than a fully manual rewrite.
Refactor
Best for
Risk-averse, tool-assisted migration
Modernizes
Java EE to Spring Boot
Firm profile
Enterprise · Global (India HQ)
Documented in
Java EE to Spring Boot Migration Services
Thoughtbot
Agency
Thoughtbot's Rails 7 upgrade work carries over the open-source testing tools it maintains, including FactoryBot and Paperclip, aimed at teams raising their testing culture during the upgrade.
Refactor
Best for
Teams that want to improve their testing culture while upgrading
Modernizes
Ruby on Rails 4–6 to Ruby on Rails 7
Firm profile
Mid-size · USA
Documented in
Ruby on Rails Upgrade Services
Thoughtworks
Agency
Thoughtworks ties its monolith-to-microservices work to the 'Strangler Fig' pattern it helped popularize, aimed at complex domain modeling rather than a single big-bang rewrite.
RefactorRewrite
Best for
Complex domain modeling (DDD)
Modernizes
Monolith to Microservices
Firm profile
Enterprise · Global
Documented in
Monolith to Microservices Migration Services
Tighten
Agency
Enterprise consulting frames Tighten's PHP-to-Laravel migration work, combining large-scale refactoring with team training rather than a pure delivery handoff.
RefactorRewrite
Best for
Large-scale refactoring and team training
Modernizes
PHP to Laravel
Firm profile
Boutique · USA
Documented in
PHP to Laravel Migration Services
Vehikl
Agency
Vehikl migrates PHP to Laravel using mob programming and test-driven development, aimed at reskilling a client's internal team during the migration rather than afterward.
RefactorRewrite
Best for
Reskilling your internal team while migrating
Modernizes
PHP to Laravel
Firm profile
Mid-size · Canada
Documented in
PHP to Laravel Migration Services
Wipro
Agency
Wipro runs Java EE-to-Spring Boot conversions through its FullStride Cloud Services line, pairing the code migration with the underlying infrastructure move rather than treating the two separately.
Refactor
Best for
End-to-end infrastructure + app migration
Modernizes
Java EE to Spring Boot
Firm profile
Enterprise · Global
Documented in
Java EE to Spring Boot Migration Services

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 4 August 2026

208

Published modernization companies reviewed

Companies shown for legacy application modernization

Platforms 3Consultancies & integrators 29

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 (32), 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.