Modernize without the big bang.
Integrated testing, legacy strangling and dual-run in one product. Old and new run side by side until the evidence says switch.
Integrated testing
One suite across legacy and new, end to end.
Legacy strangling
Replace domain by domain behind stable interfaces.
Dual-run
Same inputs, both systems, reconciled field by field.
Release gates
No switch while any difference is unresolved.
Most rewrites fail at the switch.
Big-bang cutovers bet the business on "we tested a lot". CHRONOS replaces the bet with proof, one domain at a time.
Big-bang modernization
- Years of build, one risky weekend
- Tests written from memory and old documents
- Differences found by customers, in production
- No way back once you switch
With CHRONOS
- Small, reversible steps, domain by domain
- Tests derived from approved specifications
- Differences found by reconciliation, before release
- Legacy keeps serving until the new system is proven
One test suite. Both worlds.
Lock today's behavior before you change it. Then hold every release to it.
Spec-derived tests
Regression suites generated from approved specs, not guesses.
End to end
Batch, online and interfaces tested as one flow across platforms.
Same inputs, both systems
Old and new run on identical inputs, so every difference is real.
In your pipeline
Runs in your CI/CD. Results become release evidence.
Replace the legacy, one domain at a time.
Interfaces are intercepted, traffic is routed per domain, and each step is reversible. Drag to see a program unfold.
- Route by domain, product or channel
- Mirror traffic before you serve it
- Stop or reprioritize between domains
Start: legacy serves everything
Prove equivalence before you release.
Old and new process the same inputs. Outputs are reconciled field by field. Every difference lands on a named owner.
| Output | Fields | Result |
|---|---|---|
interest_accrual | 18,240 | |
renewal_schedule | 9,120 | |
early_withdrawal_penalty | 4,410 | |
withholding_tax | 12,960 | |
ledger_postings | 6,300 | |
customer_statements | 2,150 |
Better with ATLAS. Strong on its own.
With ATLAS
- Tests generated from ATLAS-approved specifications
- Strangling plan driven by the dependency map
- Reconciliation evidence written back to the knowledge base
- Gate 2 of the ATLAS method, fully automated
Standalone
- Plugs into your existing test assets and CI/CD
- Works with any modernization approach or partner
- Bring your own specs, rules and test data
- Same reconciliation engine, same release gates
Have a modernization in flight?
Add dual-run evidence to it. No need to restart the program.