Platform
Your banking and financial services systems hold the data, logic, and business rules that power the bank. The challenge is not replacing them all at once — it is modernizing safely, in phases, without putting the business at risk.
The pressure to modernize is real. So is the risk of getting it wrong. Many financial institutions have tried — and been burned by — middleware layers, costly rewrites, and big-bang migrations that stalled, overran, or failed. The core systems are not the problem. The problem is modernizing them without a safe way to decouple, coexist, and move in phases.
Expose core banking logic as standards-based APIs in minutes, not months. No changes to the underlying system required. Digital channels gain real-time data access without workarounds.
Auto-generate standards-based APIs directly from COBOL, CICS, VSAM, IMS, and IBM i assets to support Open Banking and related compliance initiatives. Deliver modern interfaces from core systems without adding another long integration project.
AI-driven automation reduces the time and effort required to turn legacy assets into reusable services. Teams can accelerate new digital initiatives without depending entirely on scarce legacy specialists.
Some of your most valuable data and business rules still live in legacy systems. OpenLegacy unlocks it — feeding AI models, analytics platforms, and personalization engines with real-time core system data.
Decompose monolithic payment workflows into independent, API-first microservices. Support instant payment rails and new payment schemes without rebuilding your entire stack.
Direct connectivity can reduce dependency on heavy middleware and help shift selected workloads into cloud-native deployment. This can reduce MIPS consumption and shift investments from maintenance toward modernization.
Faster Time-to-Market
Rapidly launch new digital services by connecting directly to your core — mainframes, IBM i, databases, or packaged applications — without changing the systems underneath.
Cost Reduction
Reduce development effort through automation and direct connectivity, helping teams deliver modernization outcomes with less manual work.
Big Bang Rewrites
Safely decouple legacy speed from digital innovation cycles without disrupting core systems.
Initiatives where legacy systems become bottlenecks — and where we create the safest path forward.
Internal + External
Modernizing a monolithic core banking platform doesn't have to be an all-or-nothing program. Expose existing COBOL and CICS logic as APIs so domains like lending and payments can be decoupled in phases. Workloads shift in controlled waves entirely without downtime.
10x FasterAPI Creation
ZeroCutover Risk
External
Auto-generate standards-based APIs directly from COBOL copybooks, CICS transactions, and IBM i programs. Move from bespoke integration to a repeatable API factory. Bank Leumi went from COBOL to microservices in 5 minutes, delivering 8 per week with 1 developer and 100% compliance.
10x FasterAPI Delivery
-75%Integration Cost
Internal + External
Adapt batch-based COBOL flows for 24/7 instant payment initiatives. Expose CICS and MQ entry points as event-based services while the core ledger remains. Banorte achieved a 20x faster API lifecycle, eliminated their ESB dependency, and met real-time SLAs.
-70%Delivery Time
+30%Throughput
Internal + Data Layer
Expose lending functions like eligibility checks, scoring, and approvals as APIs without modifying core code. Support modern digital credit journeys where orchestration and AI-driven decisioning can natively evolve to ensure higher approval rates.
HoursTime-to-Decision
MonthsNew Products in
Data Layer
Fraud models and AI services need timely access to transaction data locked in legacy VSAM files and DB2 databases. Make that data available live, with lower latency than traditional middleware, so risk analysis and models can operate in true real-time.
<1sFraud Scoring
BypassedMiddleware
Platform
Create a new API layer — without touching the core. Expose existing mainframe transactions, programs, and data as modern APIs. Digital channels, partners, fintechs, and new cloud applications consume modern APIs while the legacy system remains the system of record. This is the fastest path to Open Banking initiatives, digital channel enablement, and reducing dependency on ESB-heavy integration.
Selectively modernize modules — while keeping the whole system running. Identify and isolate specific business functions — such as a payment validation rule, a lending eligibility check, or a fraud scoring routine — so they can be exposed, decoupled, and progressively modernized while the existing system keeps running. New functionality can then be deployed independently, reducing risk and allowing technical debt to be addressed in waves.
Unlock legacy data for AI, analytics, and real-time services. Make data from legacy databases such as DB2, VSAM, and IMS available to cloud data stores, caches, or streaming layers with less complexity than traditional middleware-heavy approaches. AI models, fraud detection engines, personalization platforms, and reporting services gain more timely access to the data they need from core systems.
01Analyze
Securely connect to mainframe, IBM i, or legacy system. Visualize dependencies, transaction flows, and data structures to identify safe decoupling points before modernization begins for the specific project or phase.
02Plan
Map your modernization plan. AI-powered automation identifies the integrations needed to support the safe decoupling pattern and builds the service blueprint — without manual reverse-engineering or specialist legacy skills.
03Execute
Auto-generate the services identified in the modernization plan. Deploy to cloud, on-premises, or hybrid environments. Iterate continuously — each wave builds on the last. Modernization becomes a practice, not a project.
Banks across multiple regions use OpenLegacy to unlock their core systems, meet compliance deadlines, and deliver new digital services without the risk of traditional modernization.
OpenLegacy integrates into modern cloud environments and works alongside the tools your teams already rely on. Whether you are pursuing a cloud migration with a hyperscaler, extending a core banking platform, or connecting fintech partners via an API gateway — OpenLegacy fits into your architecture and delivery model.
It also complements modernization programs led by cloud providers and ISVs, fitting alongside existing migration toolchains rather than replacing them.
Legacy modernization with OpenLegacy powers the personalized digital experiences today's customers expect.
See how OpenLegacy auto-generates compliance-ready APIs from core legacy systems — enabling PSD2, Open Finance, and regional Open Banking mandates without a rewrite, without specialist skills, and without touching the core.
Read the BriefOne of Israel's largest banks needed Open Banking compliance fast. See how they went from a manual, multi-day process to an automated microservice factory — delivered by a single developer in one week.
Learn More in Success StoriesExternal, Internal, and Data Layer decoupling — three proven approaches to build a coexistence bridge between your mainframe and the cloud — enabling you modernize in accelerated derisked phases.
Learn About CoexistenceOur team will show you how OpenLegacy connects to your specific systems — mainframe, IBM i, or legacy application — and generates an API in a live session. No commitment. No specialist knowledge required on your end. Just your system details and 30 minutes.
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Banks across multiple regions use OpenLegacy to unlock their core systems, meet compliance deadlines, and deliver new digital services without the risk of traditional modernization.
Bank Leumi
Bank Leumi took an API-first approach enabling to develop and deploy a microservice from the mainframe CICS to Amazon EKS Anywhere-in 5 minutes or less.
Read more
Banorte
Eliminating ESB layers dramatically accelerated performance: Compared to the previously developed APIs, OpenLegacy’s APIs were 70x faster.
Read more
Citi
Citi connected legacy host systems to modern cloud-based treasury and payment services without disruptive core changes.
Read moreBanks across multiple regions use OpenLegacy to unlock their core systems, meet compliance deadlines, and deliver new digital services without the risk of traditional modernization.
