Lazarus converts AS/400 COBOL, RPG, and CL to production-ready Java 21 + Spring Boot — with auto-generated tests, database migration, cloud deployment, and a parallel-run engine that proves correctness before you decommission the AS/400. End-to-end. Auditable. No big-bang cut-over.
Lazarus is the modernization platform for AS/400 and mainframe COBOL estates — built by people who've seen what goes wrong when the parallel-run isn't built in from day one.
COBOL, RPG, and CL → Java 21 + Spring Boot 3 (or Python FastAPI / C# .NET 8 on Professional+). Every paragraph maps to a private method. BigDecimal for every numeric calculation — never double. 100% of business logic preserved. JUnit 5 tests generated alongside.
DB2/400 physical files → PostgreSQL or Aurora, with logical files becoming views and indexes. Flyway migrations generated automatically. Continuous replication via AWS SCT, pgloader, or Striim during the parallel-run window.
Green-screen DDS panels become modern React components. Field-level validation preserved. Function keys mapped to UI affordances. Users see the same workflow — without the green screen.
One click to deploy. Lazarus SSHes into your VPS or cloud account, checks prerequisites, installs Docker and Java, runs Flyway migrations, starts the container, validates health, and runs smoke tests. Every step streamed live to your browser via WebSocket.
The killer feature. Lazarus proxies traffic to both AS/400 and the new Java service simultaneously. The canonical system commits; the other is compared. Discrepancies get an AI diagnosis explaining the diff. No CTO signs off on decommissioning without this.
For banks that cannot send source code to the internet. A self-hosted Docker bundle with an open-weights model running locally. Same product, sovereign deployment, no external API calls.
Every action burns credits. Every plan ships with a monthly credit allowance. Top-up packs never expire. The table below is the public reference rate — partners and Enterprise contracts get bespoke pricing.
@RestController for a converted @Service, with OpenAPI annotations.First 10,000 credits are free, no card required. Top-up packs available at £0.0008/credit on the Growth pack. Unused monthly credits do not roll over; one-time top-ups never expire.
Most enterprises choose a hybrid path. Lazarus is the only platform that can execute all four strategies on the same estate, in parallel.
Run AS/400 workloads on cloud emulation immediately to stop the hardware-cost clock. Days to weeks. Lowest risk, smallest change.
Keep the COBOL, move it to a Linux/cloud COBOL runtime. Stable code, tight deadlines. Weeks to months.
The Lazarus core: COBOL → Java 21 + Spring Boot via the conversion engine. Best for large codebases. Months.
For modules where the legacy logic is opaque or strategy-critical. Use the assessment report to scope. Quarters.
Before the first conversion: dependency map, complexity score, prioritized backlog. Sometimes the right answer is "don't migrate this one."
Never big-bang. The parallel-run engine validates equivalence before traffic moves. Roll back any time during cut-over.
An RPG batch job that's run unchanged since 2003 enters the conversion engine. Watch Lazarus analyze, convert, generate JUnit 5 tests, run a parallel-run validation, and stage the deploy — with a full audit trail every step.
A founding-team engineer will get back to you within one business day with a tailored walkthrough — and an honest read on whether Lazarus fits your stack.
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Tell us what you're running today. We'll tell you, honestly, whether Lazarus is the right tool — and what we'd swap in if not.