Dario Gabriel

I've built and supported high-load backend systems for Westwing Brasil, Leadtech, HITSS Brasil, and Global HITSS Brasil, spanning e-commerce, payments, government platforms, and SaaS products.

At Leadtech, I owned Stripe integration end to end, including webhooks, saved-card flows, digital wallets, idempotency keys, and row-level locking to prevent duplicate charges under retries and concurrent requests. At Westwing, I worked on checkout, payments, orders, and logistics for a B2C marketplace processing millions of monthly transactions.

I build with Node.js, TypeScript, NestJS, Go, Java, and PHP, backed by PostgreSQL, MongoDB, Redis, RabbitMQ, Kafka, AWS, Docker, and Kubernetes. I take features from architecture discussions through production, including CI/CD, monitoring, incident response, and performance optimization.

I'm also building a real-time Shooting Score Platform using NestJS, CQRS, Prisma, PostgreSQL, Redis, Socket.IO, OpenAPI-generated types, and Vitest.