Blog
Architecture notes on financial systems.
PIX: a reference architecture for instant settlement
How to design a PIX integration that's resilient against the SPI, with guarantees around idempotency, reconciliation and 24/7 high availability.
Modular core banking: why well-designed monoliths beat premature microservices
A case study on bounded contexts in core banking platforms, and when decomposing into services is actually worth it.
Open Finance: API security beyond FAPI
Security layers that an Open Finance participant needs to implement beyond what the regulatory standard requires.
Event Sourcing in financial systems: when it's worth the cost
A practical guide to where event sourcing solves real auditing and reconciliation problems — and where it just adds complexity.
Central Bank compliance in practice: KYC and AML as part of the architecture
How to structure onboarding, transaction monitoring and regulatory reporting without turning compliance into a product bottleneck.
Scaling Node.js and TypeScript to 99.99% availability
Engineering practices — from graceful shutdown to circuit breakers — for running Node.js in mission-critical financial systems.