Top 15 legacy software modernization companies
- As systems are getting way harder to manage, more leaders are making the decision to modernize
- The cost of maintaining and risks of changing – and pressure to adapt – are factors quickly colliding
- We looked at what the market can offer but went way beyond the services and stacks
- We listed the forerunners and highlighted their strengths – just pick the winner and get it started
Your partner should provide more than just migration and build a foundation for automation and innovation. You need real depth to handle technical debt without losing business logic, data, processes, and integrations you’ve built over years of running your operations.
We found and reviewed the best of providers to choose for reliable legacy software modernization services.
The longer you wait, the harder it gets
98% delayed legacy modernization – and felt the impact
You postponing the obviously necessary changes doesn’t make legacy applications less complex or expensive. This deepens the existing technical liability, thus making future transformation both difficult and risky.
Kyndryl reports, 98% of surveyed organizations have seen negative impacts after delaying legacy modernization.
9% understand their dependencies
With hundreds of critical business applications, any change can affect connected systems and integrations. Without seeing the dependencies between these, a project becomes harder in planning and execution.
Kyndryl found, 9% of surveyed organizations fully understand their dependencies.
49% faced higher-than-expected costs of maintenance
Legacy applications can consume entire budgets that could otherwise support new capabilities and growth. Every dollar spent keeping them running is one now unavailable for funding either automation or innovation.
Ensono reports, 49% of IT leaders have reported that costs of maintenance have exceeded their expectations.
Federal spending gone wild: 79% spent on maintenance
GAO reports, in 2025, federal agencies were planning on spending $83 billion on operations and maintenance. They have also identified 11 critical legacy systems that cost $754 million a year to operate and maintain.
When that much goes toward running current systems, where’s room to invest in modernization or innovation?
What exactly we looked at making this list
We focused on providers who have distinct strengths, from large enterprise systems to specific legacy stacks. No more flashy vendors who make loud statements, only knowledge behind decisions and results behind work – we know what makes a professional stand out.
Our picks all demonstrate:
- Relevant expertise, from rehosting to replacing, and everything in between
- Technical depth, from large enterprise systems to specific legacy stacks
- Proven experience of handling real-world challenges without disrupting mission-critical processes
- Strong evidence (case studies, recognizable clients, measurable results, positive reviews
Top 15 legacy software modernization companies: a comparison
| Project size | Company size | Best match | |
| Abto Software | $10,000+ | 250-999 | Mid-sized and large enterprises that need deep engineering for complex legacy products, with advanced AI capabilities and automation, where modernization goes beyond code migration. |
| Net Solutions | Undisclosed | 250-999 | Mid-sized and large enterprises that need gradual optimization of outdated legacy systems including infrastructure and integrations, where modernization doesn’t disrupt mission-critical functions. |
| Softacom | $1,000+ | 50-249 | Different-size organizations that run Delphi applications or other legacy stacks and need to preserve business logic while modernizing what’s underneath. |
| MobiDev | $10,000+ | 250-999 | Different-size organizations with outdated software ecosystems that still carry weight and need to migrate to modern web/mobile/cloud technologies or integrate AI capabilities. |
| Leobit | $25,000+ | 50-249 | Different-size organizations that run Microsoft-based applications and need to move from the .NET framework to modern .NET 8/9/10 while preserving business logic. |
| Geniusee | $25,000+ | 250-999 | Different-size organizations that run data-heavy applications and need to more to modern cloud infrastructure to build a foundation for future AI efforts. |
| KITRUM | $25,000+ | 250-999 | Mid- and large-size companies with old monolithic architectures that need an incremental modernization approach to keep operations running. |
| INOXOFT | $25,000+ | 50-249 | Mid- and large-size companies in highly regulated industries who need an experienced modernization partner to prioritize data protection, maintainability, scalability, and security as much as migrating the technology. |
| ScienceSoft | $5,000+ | 250-999 | Large-scale organizations that need to modernize complex systems while maintaining business continuity. |
| Computools | $25,000+ | 250-999 | Different-scale organizations that seek digital transformation to drive business value but starting with assessment and building a roadmap before committing to rehosting, replatforming, refactoring, rearchitecting, rebuilding, or replacing. |
| CSHARK | $50,000+ | 250-999 | Mid- and large-scale firms with complex legacy systems, in particular .NET environments, that need engineering-heavy modernization. |
| Romexsoft | $50,000+ | 50-249 | Mid- and large-scale firms that want to move to the AWS environment and need cloud architecture and optimization. |
| Saritasa | $50,000+ | 50-249 | Different-size organizations that look for modernization to extend beyond applications into infrastructure, cloud, platforms, and containers. |
| Fingent | $25,000+ | 250-999 | Different-size organizations that look for modernization to go along with AI integration and automation. |
| Attract Group | $25,000+ | 50-249 | Any-size companies that need incremental replacement with minimal business disruption, in particular when functionality is not well documented or difficult to replicate. |
Top 15 legacy software modernization companies, the deep-dive
Abto Software
Founded back in 2007, Abto Software is a legacy software modernization company with over 300 employees, a dedicated R&D lab with over 50 experts in mathematics and physics who run their most innovative initiatives, and projects across domains. They delivered 270+ projects, with many specifically aimed at migration and modernization.
The company has a 4.9/5 rating on Clutch, based on 22 reviews.
Abto Software’s track record includes solutions across industries (healthcare, retail, manufacturing, construction, logistics, energy, and others), as well as multiple long-running partnerships with over 200 clients (from startups to governments). Many lasted 5-10+ years, which demonstrates their ability to support an enterprise AI initiative way beyond PoC and MVP stages.
More importantly, they combine software engineering with applied AI expertise. In particular, they cover AI consulting, generative AI, multimodal AI, AI agents, RAG systems, advanced analytics, computer vision, and more, mainly focusing on solving operational challenges rather than following trends.
They combine legacy modernization with value-focused, science-driven engineering and strong R&D culture, with expertise in automation and large-scale, enterprise-level ecosystems.
Core capabilities:
- Legacy assessment & roadmap
- Code migration & refactoring
- Application re-architecture
- UI/UX modernization
- Cloud migration
- Data migration
- Enterprise integration
- Gradual extension
Founded: 2007
HQ: New York, USA
Size: 250-999 employees on Clutch
Pricing: $25-$49/hour rate on Clutch
Industries: States experience across industries (healthcare, retail, manufacturing, construction)
Clients: LG, Bayer, Kryon, JustAnswer, slingshot, SkyBow, Blinktbi, Lime-Tec
Net Solutions
Founded back in 2000, Net Solutions is a custom product engineering company with over 25 years of experience that specializes in complex enterprise applications, platforms, integrations, and legacy software modernization. The company particularly emphasizes long-term ownership, with some client relationships even lasting more than a decade.
The company has a 4.7/5 rating on Clutch, based on 54 reviews.
They combine legacy refactoring and ongoing engineering practice rather than disruptive rewriting.
Core capabilities:
- Application modernization
- Application refactoring
- Cloud migration
- Platform re-architecture
Founded: 2000
HQ: Toronto, Canada
Size: 250-999 employees on Clutch
Pricing: $25-$49/hour rate on Clutch
Industries: States experience across industries
Clients: Euro Car Parts, GSF Car Parts, Harvard Business Review, PayPal, IMG, Xerox, Hancocks, 2XU
Softacom
Founded back in 2008, Softacom specializes in legacy software migration and modernization, with particularly deep expertise in moving Delphi and .NET applications, including upgrades from older Delphi versions. Its recent work includes a migration of older Delphi 6 to modern Delphi 12.2, the replacement of legacy Borland Database Engine, and moving a system to a 64-bit and Linux environment.
The company has a 5.0/5 rating on Clutch, based on 9 reviews.
Softacom brings in-depth expertise in modernizing Delphi-based applications and other difficult stacks.
Core capabilities:
- Delphi modernization & migration
- Application re-engineering
- .NET modernization
- Database modernization & migration
Founded: 2008
HQ: Warsaw, Poland
Size: 50-249 employees on Clutch
Pricing: $50-$99/hour rate on Clutch
Industries: States experience across industries
Clients: Kissflow, Microcom, M2 Systems Corporation, icTrainer
MobiDev
Founded back in 2009, MobiDev specialized in legacy software migration and modernization, with particularly broad expertise in modern web/mobile/cloud technologies and integrating AI capabilities. They completed 120+ projects specifically aimed at migration and modernization, including migrations from already outdated frameworks and technologies to more modern stacks while preserving existing functionality.
The company has a 4.9/5 rating on Clutch, based on 16 reviews.
MobiDev brings deep expertise in combining code migration and modern web/mobile/cloud technologies.
Core capabilities:
- Application modernization
- Application re-engineering
- Cloud migration
- Technology migration
Founded: 2009
HQ: Sacramento, USA
Size: 250-999 employees on Clutch
Pricing: $50-$99/hour rate on Clutch
Industries: States experience across industries
Clients: ComCash, Zoundream, GrowthHackers, WCOACH
Leobit
Founded back in 2014, Leobit is a software engineering company with strong Microsoft and .NET expertise, with their own dedicated QA office, 30+ certified QA engineers, and an ISO 27001:2022 certified process. Its teams particularly specialize in modern web/mobile/cloud and .NET technologies, thus making the company particularly suited to focused Microsoft-stack modernization.
The company has a 5.0/5 rating on Clutch, based on 62 reviews.
Leobit сombines.NET and Microsoft expertise with experience in migrating and modernizing legacy applications.
Core capabilities:
- Application re-architecture
- .NET migration
- Cloud migration & modernization
- Microservices development
Founded: 2014
HQ: Lviv, Ukraine
Size: 50-249 employees on Clutch
Pricing: $25-$49/hour rate on Clutch
Industries: States experience across industries
Clients: Fortune 500 companies, Silicon Valley startups
Geniusee
Founded back in 2017, Geniusee is a software engineering company that’s grown to over 300 people and combines code modernization with applied AI expertise, cloud migration, data modernization, and more, making them a fit for organizations that look to modernize their applications and the technology foundation around them. They are a certified AWS partner and built a substantial track record with projects for clients all across the world.
The company has a 5.0/5 rating on Clutch, based on 71 reviews.
Geniusee combines cloud and data engineering with experience in migrating and modernizing legacy applications.
Core capabilities:
- Application modernization
- AI integration
- Cloud transformation
- Data modernization
Founded: 2017
HQ: Warsaw, Poland
Size: 250-999 employees on Clutch
Pricing: $25-$49/hour rate on Clutch
Industries: States experience across industries
Clients: Dell, Bloomberg, Spicerhaart, Alvarez & Marsal
KITRUM
Founded back in 2016, KITRUM is a custom software engineering company that specializes in modernizing and scaling digital products, with expertise spanning microservices, API development, and architecture. Its work includes auditing a live marketplace architecture and refactoring backend components to reduce manual work and improve data consistency.
The company has a 5.0/5 rating on Clutch, based on 73 reviews.
KITRUM focuses on modernizing critical applications while keeping them operational throughout migration.
Core capabilities:
- Legacy modernization
- Platform re-architecture
- Cloud transformation
- Backend modernization
Founded: 2016
HQ: Miami, USA
Size: 250-999 employees on Clutch
Pricing: $50-$99/hour rate on Clutch
Industries: States experience across industries
Clients: Lula, Franatech, Testerly, JayDevs
INOXOFT
Founded back in 2014, INOXOFT is a custom software engineering company with expertise in modern web technologies, .NET, cloud, and secure application development, with a growing focus on integrating AI capabilities and complex enterprise systems. Its work includes replacing outdated systems, in particular a logistics management system that reduced manual paperwork and increased operational efficiency.
The company has a 5.0/5 rating on Clutch, based on 74 reviews.
INOXOFT focuses on engineering strong security, with expertise in protecting sensitive information.
Core capabilities:
- Legacy modernization
- Application re-engineering
- Cloud services
- System integration
Founded: 2014
HQ: Newark, USA
Size: 50-249 employees on Clutch
Pricing: $25-$49/hour rate on Clutch
Industries: States experience across industries, with focus on healthcare
Clients: Twilio, MyTutor, BOS-DIMEX, 28Watt, Swotknot, EntryCity
ScienceSoft
Founded back in 1989, ScienceSoft is a custom software engineering company with expertise in complex enterprise systems, 750+ experts, 4,300+ projects, and experience across industries. Its recent recognition includes Frost & Sullivan’s 2025 Enabling Technology Leadership Award for their healthcare projects and the AI Leader Awards 2026 for their insurance and financial services.
The company has a 4.8/5 rating on Clutch, based on 43 reviews.
ScienceSoft brings deep expertise in modernizing enterprise systems, in particular in highly regulated settings where security is critical.
Core capabilities:
- Legacy modernization
- Application re-engineering
- Cloud services
- Enterprise integration
Founded: 1989
HQ: McKinney, USA
Size: 250-999 employees on Clutch
Pricing: $50-$99/hour rate on Clutch
Industries: States experience across industries
Clients: Walmart, IBM, Deloitte, Viber, Baxter, eBay
Computools
Founded back in 2014, Computools is a custom software engineering company that stand out for a particularly structured approach to modernization that combines legacy assessment, technical audits, migration, re-engineering, and more. Its portfolio includes projects that range from smaller to large enterprise engagements worth over $1 million, while clients frequently highlight its expertise and ability to adapt to complex business requirements.
The company has a 4.9/5 rating on Clutch, based on 101 reviews.
Computools focuses on assessment by using legacy audits to define the path before re-engineering.
Core capabilities:
- Legacy assessment & audit
- Application modernization
- Cloud migration
- Code migration
Founded: 2013
HQ: New York, USA
Size: 250-999 employees on Clutch
Pricing: $25-$49/hour rate on Clutch
Industries: States experience across industries
Clients: Visa, Epson, IBM, Dior, British Council, Generation Group
CSHARK
Founded back in 2014, CSHARK is an engineering-focused software company that combines software development, cloud infrastructure, data integration, and modernization, with expertise in modern .NET environments. Its work includes complex enterprise-grade systems, with clients particularly highlighting its thoroughness and ability to challenge business requirements.
The company has a 4.9/5 rating on Clutch, based on 19 reviews.
CSHARK specializes in providing .NET-based modernization, more specifically engineering-heavy projects, with experience in designing modern architectures.
Core capabilities:
- .NET modernization
- Application re-architecture
- Infrastructure migration
- Code refactoring
Founded: 2014
HQ: Wrocław, Poland
Size: 250-999 employees on Clutch
Pricing: $50-$99/hour rate on Clutch
Industries: States experience across industries, with focus on finance
Clients: Telenor, Retnig, Kanri, Zortrax, RegenHu, VecCtor
Romexsoft
Founded back in 2004, Romexsoft is an engineering-focused software company, with an AWS Advanced Tier Services Partner status and multiple AWS competencies, and other service-delivery designations. Its work includes moving existing solutions and continuing to operate and evolve them even after migration.
The company has a 5.0/5 rating on Clutch, based on 11 reviews.
Romexsoft specializes in providing AWS-based modernization, more specifically cloud-native architectures.
Core capabilities:
- AWS modernization
- Infrastructure modernization
- Infrastructure migration
- DevOps & code containerization
Founded: 2004
HQ: Lviv, Ukraine
Size: 50-249 employees on Clutch
Pricing: $50-$99/hour rate on Clutch
Industries: States experience across industries
Clients: Digitail, LearnCube, SavvyMoney, Healthera, Gorgany, Omnyfy, DarwinCX, RevaliaBio
Saritasa
Founded back in 2005, Saritasa is a software engineering company that covers legacy application, infrastructure, platform, and even cloud modernization, with experience that spans enterprise systems. Their portfolio includes modernization of a 15-year-old portal that they have rebuilt from scratch and delivered a more efficient platform.
The company has a 4.8/5 rating on Clutch, based on 108 reviews.
Saritasa specializes in transforming legacy infrastructure, cloud, platform, and containerization.
Core capabilities:
- Application modernization
- Infrastructure modernization
- Cloud migration
- Platform re-architecture
Founded: 2005
HQ: Irvine, USA
Size: 50-249 employees on Clutch
Pricing: $50-$99/hour rate on Clutch
Industries: States experience across industries
Clients: Makita, iHeartMedia, Cheesecake Factory, Sports Thread
Fingent
Founded back in 2003, Fingent is a software engineering company that combines legacy upgrades with applied AI expertise, intelligent automation, predictive analytics, and custom software development, with over 700 projects across industries. Their publicly named clients include giants (Mastercard, Sony, PwC, NEC), and recently, they had been named one of America’s Most Reliable Companies for 2026.
The company has a 4.9/5 rating on Clutch, based on 66 reviews.
Fingent specializing in extending legacy environments while introducing intelligent workflows.
Core capabilities:
- Application modernization
- Application re-engineering
- Cloud migration
- AI integration
Founded: 2003
HQ: White Plains, USA
Size: 250-999 employees on Clutch
Pricing: $25-$49/hour rate on Clutch
Industries: States experience across industries
Clients: Sony, Mastercard, PwC, NEC
Attract Group
Founded only in 2011, Attract Group is a custom software engineering company that takes a careful, incremental approach to modernization and uses behavioral tests to preserve existing functionality while refactoring outdated systems in stages. Its methodology also uses AI-assisted development while keeping production decisions and architecture under strict human control.
The company has a 5.0/5 rating on Clutch, based on 39 reviews.
They use AI-assisted development and automation for legacy code refactoring while preserving key functionality.
Core capabilities:
- Legacy modernization
- Application re-engineering
- Automated testing
- AI-assisted development
Founded: 2011
HQ: Amsterdam, Netherlands
Size: 50-249 employees on Clutch
Pricing: $25-$49/hour rate on Clutch
Industries: States experience across industries
Clients: Infento, LIBERNETIX, CASSA, Belichberg
How we can help
We combine R&D mindset and applied AI expertise to modernize old systems without creating more problems. From identifying the gaps and assessing the risks to migrating the applications and extending their functionality – a partner to bring the expertise and depth to modernize aging systems while preserving business continuity.
We keep what works and reshape what doesn’t.
Our expertise:
- Robotic process automation services
- Hyperautomation services
- Healthcare modernization
- Healthcare automation, and more
In particular:
FAQ
Here are our picks:
- Abto Software
- Net Solutions
- Softacom
- MobiDev
- Leobit
- Geniusee
- KITRUM
- INOXOFT
- ScienceSoft
- Computools
- CSHARK
- Romexsoft
- Saritasa
- Fingent
- Attract Group
The factors we consider:
- Relevant expertise
- Technical depth
- Proven experience
- Credible evidence
The scope might include:
- Legacy assessment and roadmap
- Code migration and refactoring
- Application re-engineering and re-architecture
- UI/UX modernization
- Monolith-to-microservices transformation
- API modernization
- Cloud migration
- Data migration
- Enterprise integration
- Gradual extension
You have the choice:
- To move the system to a modern infrastructure, or rehost
- To use the capabilities of a newer platform, or replatform
- To improve the code while preserving existing behavior, or refactor
- To change the architecture for flexibility and scalability, or rearchitect
- To build the system from the ground up, or rebuild
- Or adopt another system (if others are unfeasible), or replace
Start with the requirements:
- Business goals
- Technical requirements
- Project size and complexity
- Project budget and timeline
- Future needs
- Operational constraints
- Employee training
- Ongoing support
What’s holding you back?
- If high infrastructure costs, then rehost
- If limited cloud compatibility, then replatform
- If poor code quality, then refactor
- If flexibility and scalability, then rearchitect
- If fundamental code limitations, then rebuild
- A completely obsolete system? Then replace.
The project can take from weeks to years:
- A focused legacy assessment or proof-of-concept: Just a few weeks
- A limited business application or component: From a few weeks to a few months
- A substantial legacy application: Several months to an entire year or more
- A large enterprise transformation: Several years, often delivered in phases
The project can cost from thousands to millions:
- A focused legacy migration: From a few thousands to tens of thousands of dollars
- A complex enterprise transformation: From hundreds of thousands to millions of dollars
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