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Case Study · Fintech
Payments core modernization without freezing the roadmap
HelixPay needed lower latency and safer releases while shipping new lending features every sprint.
62%
API latency reduction
0
Downtime at cutover
4×
Release frequency
Client challenge
A monolithic payments service coupled ledger writes to partner APIs. Peak windows spiked p95 latency above 900ms, and deployments required weekend freezes.
Technical solution
Strangled services
Extracted authorization and settlement into separately deployable services with idempotent APIs.
Event-backed ledger
Introduced an append-only event stream with projection rebuilds for read models.
Progressive delivery
Canary releases with automated rollback on SLO burn.
Measured results
- p95 latency from ~900ms to ~340ms on critical paths
- Zero customer-facing downtime during cutover weekend
- Release cadence from monthly to weekly with confidence