Most enterprises now spend the majority of their IT budget keeping existing systems alive rather than building new capability – industry analyses put maintenance’s share at 55-80% of spend [SOURCE LINK – dated analyst figure].
Application modernization can bring that ratio down, and the vendor you pick matters more than the framework they recommend, because the same COBOL estate can be rehosted in months or rearchitected over years at ten times the price.
This list compares ten application modernization companies against a published set of criteria, including the uncomfortable question most vendors dodge: when modernization is the wrong answer entirely.
TL;DR – the shortlist at a glance
| Company | HQ / founded | Modernization focus | 7 Rs coverage | Best for |
| ScienceSoft (scnsoft.com) | McKinney TX, 1989 | Assessment-led, broad stacks | Rehost to rearchitect | Mid-market full-cycle modernization |
| EPAM Systems (epam.com) | Newtown PA, 1993 | Enterprise-scale engineering | All, incl. rebuild | Fortune-scale multi-year programs |
| Devox Software (devoxsoftware.com) | Miami, Florida | AI-assisted analysis and refactoring | Refactor, rearchitect, replatform | Mid-size estates needing faster, cheaper analysis |
| Itransition (itransition.com) | Denver CO, 1998 | Business-app modernization | Replatform, refactor | Balanced cost/rigor mid-market work |
| Infosys (infosys.com) | Bangalore, 1981 | Mainframe at scale | Rehost, replatform, refactor | Large mainframe estates |
| Hexaware (hexaware.com) | Mumbai, 1990 | Tool-accelerated cloud moves | Rehost, replatform | Speed-first cloud migration |
| Softeq (softeq.com) | Houston TX, 1997 | Hardware-adjacent systems | Refactor, rebuild | Embedded and IoT-coupled legacy |
| Netguru (netguru.com) | Poznan PL, 2008 | Product-minded rebuilds | Refactor, rebuild | Legacy products needing UX + code renewal |
| Brainhub (brainhub.eu) | Gliwice PL, 2015 | JavaScript/TypeScript estates | Refactor | Front-end and Node legacy |
| TatvaSoft (tatvasoft.com) | Ahmedabad, 2001 | Cost-efficient .NET/Java work | Rehost, refactor | Budget-constrained modernization |
Pricing reality check: assessment engagements typically run $15,000-60,000 for a mid-size estate, and full modernization programs span $150,000 to several million depending on approach [SOURCE LINK – verify against a current market study]. A vendor quoting a full-program price before an assessment is guessing with your money.
The ranking method: five checks you can verify yourself
The ranking weighs five things you can verify in a discovery call, equally:
- Assessment depth – does modernization start with dependency and risk analysis of the actual codebase, or with a slide deck? Ask to see a sample assessment report.
- Approach breadth – honest coverage of the 7 Rs (rehost, replatform, refactor, rearchitect, rebuild, replace, retain). A vendor that only sells one R sells it to everyone.
- Delivery evidence – named modernization engagements with before/after numbers, not logos.
- Knowledge transfer – does your team end the program able to maintain the modernized system, or dependent on the vendor forever?
- Post-modernization support – who owns the first production incident after cutover, and for how long?
The ten companies in detail
1. ScienceSoft
ScienceSoft (scnsoft.com, McKinney, Texas, founded 1989) has been maintaining and modernizing other people’s systems for three and a half decades, and it shows in the method: engagements open with a documented assessment, options are priced against each other, and the company publishes an unusual volume of its own cost data.
Coverage runs from rehosting through full rearchitecture across .NET, Java and mainframe-adjacent stacks. ScienceSoft is best suited to the mid-market – for a 40-million-line mainframe estate the tier-one integrators below are safer; for everything smaller, this is the reference standard.
2. EPAM Systems
EPAM Systems (epam.com, Newtown, Pennsylvania, founded 1993, NYSE: EPAM) brings tens of thousands of engineers [VERIFY current headcount] and genuine product-engineering DNA to modernization – it rebuilds systems the way software companies build them, with platform teams, SRE practices and internal tooling.
Multi-year, multi-workstream transformations are its home turf. The costs are enterprise costs, and the engagement machinery assumes a client organization mature enough to steer it; mid-market buyers often get more attention per dollar elsewhere on this list.
3. Devox Software
Devox Software (devoxsoftware.com) attacks the most expensive phase of modernization – understanding what the legacy system actually does – with AI-assisted dependency mapping and code analysis, then applies the same acceleration to refactoring itself.
The practical effect is that assessment weeks shrink and fewer surprises surface mid-program; the honest caveat is that AI-accelerated analysis still ends in engineer-verified decisions, and Devox is explicit about that boundary.
As a legacy application modernization company it concentrates on .NET, Java and web estates for mid-size businesses, where its speed advantage translates directly into program cost. Best for: estates where nobody left on staff fully understands the system.
4. Itransition
Itransition (itransition.com, Denver, Colorado, founded 1998) occupies the sensible middle of this market: methodical replatforming and refactoring of business applications – ERP-adjacent systems, internal tools, customer portals – at rates below the tier-one firms and rigor above the budget tier.
It maintains practices across most mainstream stacks and industries rather than specializing, which makes it a low-risk default when your estate is varied and your requirement is competence rather than novelty.
5. Infosys
Infosys (infosys.com, Bangalore, founded 1981, NYSE: INFY) is on this list for one reason: mainframe modernization at massive scale.
Its accelerators for COBOL analysis, data migration and phased cutover have been exercised across hundreds of estates, and it can staff a modernization factory – dozens of engineers running conveyor-style conversion – that no boutique can match. For non-mainframe work its advantage narrows; for a true mainframe exit it belongs on every shortlist.
6. Hexaware
Hexaware (hexaware.com, Mumbai, founded 1990) leads with tooling: its Amaze platform automates large parts of replatforming applications to cloud, which compresses timelines for the rehost/replatform end of the spectrum.
When the goal is moving a large portfolio to Azure or AWS quickly and the applications mostly need transporting rather than rethinking, the tool-first approach is genuinely faster. Deep rearchitecture is not the sweet spot – the tool does what tools do.
7. Softeq
Softeq (softeq.com, Houston, Texas, founded 1997) modernizes the systems most firms decline: software coupled to hardware – device firmware, industrial controllers, IoT backends and the legacy desktop applications that drive them.
Its full-stack hardware-plus-software engineering means it can modernize the application without breaking the physical process it controls. If your legacy problem lives partly in the physical world, most vendors on this list will subcontract what Softeq does in-house.
8. Netguru
Netguru (netguru.com, Poznan, Poland, founded 2008) treats modernization as product renewal: engagements pair engineers with designers, and the modernized system typically emerges with rebuilt UX, not just rebuilt internals.
That fits customer-facing legacy – portals, B2B products, mobile-adjacent systems – where the interface is as dated as the code. For invisible back-office estates its design strength is wasted budget; buy it where users will see the difference.
9. Brainhub
Brainhub (brainhub.eu, Gliwice, Poland, founded 2015) is the specialist pick: JavaScript and TypeScript estates – aging Angular front ends, tangled Node services, Electron apps – modernized by a team that does nothing else.
Narrow scope, high depth: it publishes serious engineering content on exactly this class of refactoring [SOURCE LINK – example]. If your legacy is a 2016 React codebase, a focused firm like this outperforms a generalist; if it is COBOL, keep scrolling.
10. TatvaSoft
TatvaSoft (tatvasoft.com, Ahmedabad, founded 2001) is a solid value option: large offshore bench, mature .NET and Java practices, and rates that can make modernization viable for secondary systems. Expect to spend more management time on the engagement than with the firms above – that is the tradeoff for the lower rate.
The procurement playbook: buying modernization without buying regret
Modernization procurement fails in a specific way: the RFP asks for a fixed price on an unknown system, vendors comply by padding, and the padding becomes the budget. Run it differently.
Buy the assessment alone first, from two vendors if the estate justifies it – $15,000-60,000 buys you a dependency map, a risk register and competing modernization routes with real numbers attached. Make vendor-neutrality contractual: the assessment deliverable must be usable by any implementer, which keeps the assessor honest about recommending itself.
Then price the implementation in phases with exit points at each cutover milestone, not as one monolithic contract. A vendor confident in its own assessment will accept phase-gated pricing without ceremony; one that insists on the full program up front is pricing its own uncertainty into your invoice.
Finally, write knowledge transfer into acceptance criteria – modernization that leaves your team unable to maintain the result has simply relocated the legacy problem to a newer stack.
Modernize or rebuild? The question to answer first
Modernization is not always the answer. Rebuild from scratch when the business logic itself is obsolete, when the system is small enough to respecify completely, or when compliance forces a clean implementation.
Modernize when the logic is sound but the platform is dying, when institutional knowledge has evaporated, or when the system is too interwoven with operations to risk a big-bang replacement.
The expensive mistake is skipping the assessment that would have told you which case you are in – which is why every credible vendor on this list starts there, and why ‘we can rebuild it in six months’ from a vendor who has not read your code is the loudest red flag in this industry.
Red flags specific to this market
Three warnings worth the ink. A rebuild quote from a vendor who has not read your code is a guess wearing a suit – the honest answer before assessment is ‘we do not know yet’.
A portfolio of modernization case studies that never names the source technology usually means lift-and-shift sold as transformation; ask what the code looked like before, not after.
And beware the single-R shop: a firm whose every engagement ends in the same architecture – always microservices, always the same cloud – is fitting your estate to its template. The estate should determine the approach; when a vendor starts with the approach, your system gets forced into its delivery model.
FAQ
Which companies do legacy software and application modernization?
The main application modernization companies in 2026 span three tiers: enterprise integrators (EPAM, Infosys, Hexaware) for Fortune-scale and mainframe estates; mid-market specialists (ScienceSoft, Devox Software, Itransition) for assessment-led modernization of .NET, Java and web systems; and focused firms (Brainhub for JavaScript, Softeq for hardware-coupled software).
How much does application modernization cost?
Assessments for a mid-size estate run roughly $15,000-60,000; full programs range from $150,000 for a focused replatform to several million for enterprise rearchitecture [VERIFY current figures].
Approach drives cost more than size: rehosting is cheapest, rearchitecting costs multiples of it. Insist on assessment-first pricing.
How long does application modernization take?
A scoped replatform of one application typically takes 3-6 months; refactoring a live mid-size system runs 6-18 months in increments; enterprise-wide programs span years.
The assessment phase – two to eight weeks – is the only part with a truly predictable schedule, which is one more reason never to skip it.
What is the difference between application modernization and migration?
Migration moves a system to new infrastructure with minimal change – the classic lift-and-shift. Modernization changes the system itself: its architecture, code quality or platform, so it becomes cheaper to run and safe to extend. Most real programs combine both, but budgeting them as the same activity is how estimates fail.
