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williamfds/README.md

William Ferreira da Silva

Senior Backend Engineer · Java + Node.js · Brazil 🇧🇷 (Remote · UTC-3)

I build scalable APIs, distributed systems, and complex integrations for ERP, e-commerce, and real-time platforms. 7+ years of experience modernizing legacy monoliths into event-driven microservices.

🛠 What I work with

Backend:        Java 21, Spring Boot, Node.js, NestJS, TypeScript
Architecture:   Microservices, Event-Driven, Hexagonal, Clean Architecture
Data:           PostgreSQL, MongoDB, Firebird, Redis
Real-time:      WebSockets, SSE, RabbitMQ
Frontend:       React, TypeScript, Chakra UI
DevOps:         Docker, GitHub Actions, CI/CD

💼 What I focus on

  • Designing scalable backends that hold up as user base grows
  • Building integrations with marketplaces, ERPs, fiscal systems and payment gateways
  • Modernizing legacy systems without breaking production
  • Event-driven architectures that decouple services and improve resilience
  • Mentoring and code review as senior reference on engineering teams

🌟 Open Source Contributions

Active contributor in the Fastify ecosystem — one of the most popular Node.js frameworks:

🚀 Selected projects

URL Shortener API — Stateless API with Redis caching layer, designed for horizontal scalability. NestJS + PostgreSQL + Redis + Docker.

📫 Get in touch

Open to backend / fullstack engineering opportunities · Time zones: US, LATAM, Europe

Pinned Loading

  1. nestjs-url-shortener nestjs-url-shortener Public

    TypeScript 1

  2. nestjs-url-shortener-frontend nestjs-url-shortener-frontend Public

    Frontend for the NestJS URL Shortener API with Next.js and Chakra UI

    TypeScript 1

  3. portfolio-williamfdasilva portfolio-williamfdasilva Public

    TypeScript

  4. fastify/fastify-compress fastify/fastify-compress Public

    Fastify compression utils

    JavaScript 227 55

  5. fastify/busboy fastify/busboy Public

    A streaming parser for HTML form data for node.js

    JavaScript 131 24

  6. fastify/session fastify/session Public

    Session plugin for fastify

    JavaScript 125 54