Microservices Patterns in Fintech: Lessons from 1M+ Monthly Transactions
How we designed the backend infrastructure for Mercado Pago's QR payment system — from event-driven choreography to saga patterns and idempotency keys that kept us at 100% SLA for 12+ consecutive months.
February 2026·8 min readRead article →
FintechLessons from Building Payment Systems at Scale
What I learned co-creating RappiPay: how to reason about money movement, why idempotency is non-negotiable, and the operational practices that made our co-branded credit card launch with Davivienda successful.
January 2026·10 min readRead article →
BackendGo vs Node.js for High-Throughput Backends: A Practical Comparison
After shipping production systems in both Go and Node.js at Leal and Mercado Libre, here is my honest take — when each shines, where they disappoint, and how to choose for your next project.
December 2025·7 min readRead article →