Financial Services2025Custom SoftwareCloudAPI Development
A payments core that clears in milliseconds
Replacing a decade-old payments engine with a real-time core processing millions of transactions a day, without a single minute of downtime during cutover.
Financial Services Platform
8ms
Median clearing time
3.4M
Daily transactions
0
Minutes of downtime
99.99%
Availability
The challenge
The client's payments engine was the bottleneck for every new product. Batch-based and brittle, it couldn't support instant settlement, and a full replacement had been declared 'too risky' twice before.
What we did
- 01Ran a two-week discovery to map every integration and failure mode of the legacy system.
- 02Designed an event-driven core with an immutable ledger and idempotent processing at its heart.
- 03Migrated traffic gradually behind a routing layer, proving correctness against the old system in parallel.
- 04Cut over region by region, with instant rollback available at every step.
“They did in four months what two vendors couldn't in a year. The difference was judgment, they knew what to skip.”
Get in touch
Let's engineer what's next.
Tell us where you're headed. We'll bring a small, senior team and a clear plan to get you there.