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Read, understand, and rebuild critical legacy code with proven functional parity — AI-assisted, human-validated.
Productized application of Access International's ATLAS methodology (10 steps, 9 principles, 56 learnings, 19 pitfalls) to legacy modernization: COBOL mainframe, Delphi desktop, BizTalk middleware. The promise is not automatic translation of a program: it is **predictability of the engagement** — a discrepancy registry signed as a contractual deliverable, measured functional parity, governed inherited debt. Ten internal POCs on public code (IBM carddemo, GenApp, CBSA, Raptor, BizTalk Assurance) have stabilized the method before any client mission.
Reference anonymized under confidentiality. Details available on request under NDA.
An actor who again knows what their legacy code does, can evolve it without depending on an unfindable skill, can scope a business evolution without months of preliminary audit — regains strategic autonomy. ATLAS Legacy does not sell a migration: it sells the predictability of an engagement that usually terrifies CIOs and CFOs. Expected impact: reduced operational risk on critical systems, lower operating costs after cutover, accelerated business evolutions post-modernization.
A bank or public actor maintaining a COBOL central system out of vendor support, with an aging team and operating costs drifting upward. ATLAS Legacy first delivers complete mapping (who calls what, which shared copybooks, which datasets), then proposes a migration plan by functional slice toward a cloud-native target. No big bang: step by step, with parity validated at each cutover.
A critical business application written in Delphi fifteen or twenty years ago, still used daily by operators, whose original developers have retired. ATLAS Legacy reads the code, documents the business logic, proposes a modern web target (Next.js + Node.js API) with proven functional parity. The client regains the freedom to evolve without depending on an unfindable skill.
A BizTalk Server middleware orchestrating EAI/B2B integration flows, on an announced EOL Microsoft platform. ATLAS Legacy migrates to Azure Logic Apps or cloud-native orchestration, preserving interface contracts, XSLT transformations, and critical pipelines. The internal BizTalk Insurance POC (400 orchestration lines → Logic Apps + TypeScript Cloudflare, 7/7 tests passing) stabilized the mechanics.
The most frequent configuration: Access International operates as a nearshore cell on behalf of an integrator partner (Canadian or French ESN), who carries the end-client relationship. The ATLAS methodology is packaged for co-deployment, with practice sharing and partner-team training.
This product applies to the following business functions. Click to discover how we adapt it to each.
These products combine with this one for complete programs.
Read, document, and optimize legacy KRL, RAPID, URScript, Karel, or Ladder code. No cross-brand migration, no safety recertification — just understand and improve what is already running.
AI-augmented search on your document heritage — no hallucination, with sourced citations.
Keep humans in the decision on critical cases, at scale.
**No, and we do not claim it.** LLMs significantly accelerate reading, mapping, and target-code generation on known patterns. But critical legacy migration requires senior architects who arbitrate ambiguities, validate structural choices, and sign the discrepancy registry. The ATLAS Legacy promise is **AI-assisted human predictability**, not blind automation.
It varies with size and complexity. For a single-user Delphi application of 50,000 lines, plan **3 to 5 months** with a 4-5 person cell (1 architect, 2 target developers, 1 tester, 1 client business referent). For a multi-application COBOL mainframe program of 500,000 lines, plan **12 to 24 months** by functional slices. The Discovery phase typically lasts 4 to 8 weeks and conditions the rest of the budget.
Three levers. **Automated parity tests**: replay historical test sets on the target and measure equivalence rate before cutover (target > 99% on critical paths). **Signed discrepancy registry**: every gap is documented, arbitrated between Access and the client, and signed as a contractual deliverable — no post-cutover surprises. **Dual-run**: source and target run in parallel during hyper-care, with gap monitoring. Any unexpected gap triggers a framed rollback.
Both configurations exist. **Direct**: Access International carries the relationship and delivery end-to-end, from Intake scoping through cutover and hyper-care. **Through partner** (most frequent): we operate as a nearshore assistance cell on behalf of an integrator ESN (Canadian or French) carrying the end-client relationship. The ATLAS methodology is packaged for co-deployment with practice sharing and training.
**Full source-code access** (programs, copybooks, JCL, DB schemas, deployment scripts). **Available business referent** a few hours per week to arbitrate ambiguities (critical legacy always has business rules undocumented in the code). **Access to historical test sets** or, failing that, capture of representative test cases at mission start. **Clear decision on target** (TypeScript, Java, .NET, Logic Apps) — we support that decision if not yet made.
Free initial scoping, 30 minutes to 2 hours, with a solution lead adapted to your sector.