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Achievement: Pair Extraordinairex3Achievement: QuickdrawAchievement: Public SponsorAchievement: Pull Sharkx3Achievement: YOLO

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lehafari/README.md

Rafael Cáceres

Senior Backend Engineer & Tech Lead
I build backend systems where the money has to be right.

LinkedIn · Email · Bogotá, Colombia

Six years building event-driven backends and double-entry ledgers for fintech and iGaming. I've designed and shipped two production ledger systems — a casino's multi-currency wallet engine and a fintech's card-platform financial core — and led the engineering teams behind them as Tech Lead / de facto CTO.

What I go deep on:

  • 🏦 Financial systems — double-entry ledgers, wallet engines, treasury, reconciliation
  • 🔒 Correctness under load — idempotency, concurrency control, no double-spend, balances that reconcile
  • ⚙️ Event-driven architecture — NestJS microservices + Go, SQS/SNS/Lambda/Fargate on AWS

Stack

Languages — TypeScript · Go · SQL
Backend — NestJS · Express · GraphQL Federation · tRPC · gRPC · WebSockets · BullMQ
Data — PostgreSQL · Redis · MongoDB · Drizzle · TypeORM · Prisma
Cloud & Infra — AWS (SQS, SNS, Lambda, Fargate, EC2, S3) · Railway · Docker · GitHub Actions

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