$0 PHP2Shell assessment findings in 3–5 days.
Claim Yours →Enterprises use Legacyleap's legacy modernization services to move aging systems off unsupported frameworks and onto current, cloud-ready architectures, with engineers and Gen AI agents on the Legacyleap platform handling the work end to end.
Trusted by enterprise engineering teams
Legacy software modernization has moved from a long-term IT goal to a near-term business priority. Legacy systems carry more risk and cost every year, and teams are acting on both.
AI tools find legacy flaws faster than teams can patch them, with roughly 66,000 CVEs forecast for 2026.
Vendor support for AngularJS, ColdFusion, Struts, and older .NET Framework versions has ended or is ending.
Engineers who know VB6, Delphi, and older Java are retiring, and new hires rarely arrive knowing them.
Extended support fees on end-of-life platforms rise every year and add no new functionality.
Legacyleap's legacy system modernization services match each application to the solution that fits its architecture, risk, and goals, then sequence the work from assessment to production.
A portfolio assessment defines the right modernization path for each application, balancing risk, cost, and effort.
Legacy applications move onto cloud or container platforms as they are, so business logic stays exactly as it runs today.
Applications move to modern platforms with minimal code change, so teams gain cloud-native capability without a full rebuild.
Legacyleap restructures legacy code at scale, decoupling tightly bound modules and aligning the application with modern architecture.
Schemas get restructured and monolithic data layers broken up, so your data platform can support analytics and AI workloads.
Docker containers let applications run consistently across environments and fit modern delivery pipelines.
Legacy interfaces move to responsive, modern UI and UX while the backend stays in place.
Monolithic middleware gives way to modular, scalable layers that connect cleanly to modern systems.
Legacyleap upgrades the security layers of legacy applications to meet current regulatory requirements.
Legacyleap pairs a proprietary Gen AI platform with 500+ forward-deployed experts, and every engagement ends with code, documentation, and tests you keep.
Five Gen AI agents automate about 70% of the work and deliver modernization 70 to 80% faster, with compiler guardrails on every change.
Modernization developers, QA engineers, project managers, and business analysts own delivery and do the primary code review.
That experience spans VB6, .NET Framework, Java, and ETL estates, including single applications of 800,000+ lines and estates with 1,700 DLLs.
You receive the modernized codebase, full documentation, and parity validation results, and nothing ties you to Legacyleap afterward.
Verified review via G25/5The team modernized with 95% less in-house effort, and discovered bugs users had experienced but never reported, along with unhandled corner cases.
Verified review via G24.5/5Legacyleap was well versed in older technologies and frameworks that many newer developers weren't familiar with.
A Meta-Cognitive Model maps your codebase, five Gen AI agents do the work, and Legacyleap engineers review every change, delivering modernization 70 to 80% faster inside your environment.
You have seen 3 of 1,290 nodes. In a demo, watch the agents work against a real codebase before you share yours.
The model maps your whole application so every agent works from the same context.
Maps dependencies, technical debt, and risk
Rebuilds missing documentation from the code
Chooses the target stack and migration order
Applies governed code transformations
Proves the new system matches the original
Legacyleap takes ownership of production-ready code, so your engineers stay focused on your product roadmap.
We scan a representative part of your codebase.
One application or module goes through the full platform in about 1 month.
The same process runs across your portfolio.
Every change arrives as a reviewable, reversible pull request, and Legacyleap engineers do the primary review.
You own the modernized codebase, the full documentation, and the parity validation results.
Your team gets onboarding, with no lock-in.
Four layers of application modernization software understand your code, verify every change, govern the AI models, and keep deployment inside your environment.
Legacyleap parses your code into ASTs and MLIR, then maps dependencies and data flows so agents trace the impact of every change before making it.
*Patent-filed: US Provisional Patent App. No. 63/961,626
You can use enterprise-approved or self-hosted models.
Legacyleap's legacy application modernization services start with a scan of a representative part of your codebase, with findings in 3 to 5 days, at no cost and with no obligation.
Compare application modernization services on upfront cost, timeline, and ongoing maintenance under each approach before you commit to a program.
| Measure | Traditional SI | In-house + Copilot | Legacyleap |
|---|---|---|---|
| Cost per application | $250K to $1.5M (refactor) $500K to $2M+ (rewrite) | Salaries + long timeline | $100K to $750K (refactor) $200K to $1M+ (rewrite)50 to 60% lower |
| Timeline | 6 to 18 months (refactor) 12 to 36 months (rewrite) | Depends on team capacity | 6 to 9 months (refactor) 6 to 18 months (rewrite)70 to 80% faster |
| Behavior guarantee | Manual QA | Manual QA | 100% parity, validated |
| What remains after | Code + handover | Code | Code + specs + tests + documentation |
The $0 Assessment baselines your run cost, and a first engagement measures the savings against it.
Claim my $0 assessmentTraditional ranges are typical market costs and timelines per application. Legacyleap figures apply the cost and time reductions seen across client engagements to those ranges. The $0 Assessment produces figures specific to your system.
See how Legacyleap has modernized legacy systems for enterprises, with before-and-after results from client engagements.
The airline needed its legacy operations tooling modernized without disrupting live flight operations. Legacyleap delivered the full rebuild at half the airline's own internal estimate for a manual rewrite.
The suite carried nine active security vulnerabilities and a god class holding years of unstructured logic. Legacyleap resolved the vulnerabilities, restructured that logic, and built an audit-ready foundation with automated tests.
Critical credit data pipelines had to move to a scalable, cloud-native stack without disrupting production. Legacyleap automated more than 80% of the code and test conversion while preserving the full data logic.
A platform running on end-of-support .NET Framework needed modernizing without affecting live clinical operations. Legacyleap completed the full migration in 9 months with zero disruption to care.
Legacyleap's legacy software modernization services support 15+ legacy stacks, each with a migration path to current, supported technology.
Moves Delphi forms and business logic to C# and .NET, with React for the interface.
Learn moreMaps dependencies and upgrades applications to supported .NET 6 or .NET 8 releases.
Learn moreMoves older VB.NET and early .NET code to current .NET with REST APIs.
Parses classic ASP pages, extracts business rules, and rebuilds them in ASP.NET Core.
Maps Web Forms components and UI behavior into Blazor.
Extracts service contracts and rebuilds WCF services as REST or gRPC APIs.
Rewires controllers, routing, and validation layers from Struts to Spring.
Learn moreMaps EJB components and rebuilds them as Spring Boot services.
Extracts UI logic from JSP pages into modern React or Thymeleaf frontends.
Rewrites Swing UI logic for JavaFX.
Upgrades Java 8 applications to Java 21 and generates automated tests to confirm behavior holds.
Classifies AngularJS components, updates patterns, and migrates them in stages.
Learn moreMoves legacy JavaScript framework code to React or Angular.
Replaces jQuery DOM scripting with component-based frameworks.
Maps SSIS packages and moves them to the modern data platform you choose.
Learn moreConverts ETL graphs and jobs into Spark, Airflow, and dbt pipelines.
Rebuilds ColdFusion applications on .NET or Node.js, with missing documentation reconstructed first.
Upgrades PHP and Laravel applications to current versions, with every change reviewed by engineers.
Moves Perl applications to Node.js or Python.
Identifies domain boundaries and decomposes the monolith into services.
Legacyleap delivers enterprise application modernization across industries in the US, from EHR and core banking to MES and flight operations, inside your environment and with a full audit trail.
Modernizing legacy EHR, scheduling, and revenue cycle systems means protecting patient data and keeping clinical workflows available, with HIPAA and FHIR R4 requirements in scope.
Validated systems such as CTMS and LIMS fall under 21 CFR Part 11, and modernization produces parity test results and a diff-based change history that support revalidation.
Banking legacy modernization starts by extracting and documenting the decades of business rules inside core banking, loan, and mortgage systems, with GLBA Safeguards Rule and SEC disclosure requirements in scope.
Policy administration and claims platforms hold years of adjudication and policy rules, and modernizing them means carrying that logic across intact.
Crew scheduling, maintenance, and airworthiness systems operate under FAA and TSA requirements, and modernization has to keep every workflow intact and audit-ready.
Transportation management systems (TMS) hold years of carrier rate and routing logic, and governed modernization preserves that freight intelligence through the move to a modern stack.
Manufacturing execution systems (MES) and equipment control software run production lines that cannot stop, and modernization is planned around zero-downtime cutovers and intact hardware communication.
Billing, fuel distribution, and field service systems keep energy and utility operations running, and modernization has to cut over to a modern stack without interrupting service.
Live event production runs on logistics, equipment inventory, and crew scheduling software used across many sites, and modernization has to keep it available while the stack underneath changes.
SaaS and software vendors on legacy stacks fall behind competitors on modern, multi-tenant architectures, and system integrators can run Legacyleap on their own client modernization programs.
Choose a $0 Assessment to see a modernization plan for your own codebase, or a technical demo to watch the agents work before you share any code.
See a modernization plan for your own codebase in 3 to 5 days, at zero cost.
Best if you want to know what's in your system before committing to anything.Watch the agents work against a real codebase before you share yours.
Best if you want to see the platform in action first.Answers on what modernization is, what it costs, how long it takes, how engagements work, and how Legacyleap handles security and AI.
Legacy application modernization, also called legacy system modernization, moves business-critical systems running on outdated frameworks, languages, and architectures onto current technology while keeping the business logic they already run. Done well, it lowers maintenance cost, closes security gaps, and prepares the application for cloud and AI. There are six common approaches.
Legacyleap's Assessment Agent recommends the right path for your specific system.
Traditional software modernization services typically cost $250K to $1.5M per application for a refactor and $500K to $2M+ for a rewrite. Legacyleap's results across client engagements run 50 to 60% lower.
Cost depends on codebase size and coupling, existing documentation, the target stack, and regulatory requirements. The $0 Assessment gives you an estimate specific to your system.
Legacyleap is a Dallas, Texas-based company that serves enterprises across the US in regulated and general industries.
Traditional programs typically run 6 to 18 months for a refactor and 12 to 36 months for a rewrite. Legacyleap delivers 70 to 80% faster.
The $0 Assessment returns findings in 3 to 5 days, and a paid pilot on one application or module takes about 1 month.
Legacyleap is an application modernization company that focuses only on legacy systems. Its agents work from the Meta-Cognitive Model of your whole codebase, automate about 70% of the work, and validate 100% functional parity before deployment.
Engineers review every transformation as a pull request.
Agentic AI means agents plan, execute, validate, and self-correct bounded tasks under human governance. Five agents automate about 70% of the work, covering assessment, documentation, recommendations, code transformation, and testing.
Get a detailed and personalized cost estimate based on your unique application portfolio and business goals.
