Tomás Sarmiento

Remote Senior Software Engineer delivering end-to-end integration for Banco Pichincha in 2 months, implementing full security (AES/RSA encryption, mTLS, partner certification). Led LATAM partner POC, contributed to Remitly's event-driven microservices ecosystem used by 10M+ users, and delivered backend components for Colombia instant payments launch, saving approx $25M in projected annual costs via optimized routing.

Developed over 8 microservices within a 33+ microservice ecosystem using Domain-Driven Design principles. Pioneered backend feature development representing approximately 70% of the product's functionality, used by 1500+ clients and impacting 90% of startup revenue. Collaborated closely with the CTO to architect and implement robust backend solutions using Go, Next.js/React.js, TailwindCSS, PostgreSQL, and MongoDB, resulting in a scalable and high-performance microservice ecosystem using Event-Driven Architecture.

Led the trading team in creating new trading features such as GTC limit, stop, DCA orders, and after-hours trading, which boosted revenue by roughly 20%. Resolved critical bugs preventing trading shorts and margins, saving roughly 10% of company revenue. Applied Hexagonal Architecture, Domain Driven Design, and Event Sourcing to ensure high optimization, consistency, and scalability. Orchestrated distributed caches and locks to handle concurrency for 700K+ users, ensuring near-zero inconsistency across services. Conducted over 40 technical interviews and onboarded new engineers to the team.