Luis Guilherme Siqueira Lins da Silva

Senior backend engineer, Ruby on Rails-focused, with 6+ years shipping production code, the last 3+ on a Rails SaaS platform used by nonprofits worldwide (Donorbox). I work best in the real mess of Rails in production: debugging live issues, designing APIs that don't rot, building internal tooling support teams actually use, and shipping features without breaking what's already there. At Donorbox I currently manage a small engineering team while staying hands-on as an IC, reviewing PRs, fixing production bugs, and investigating issues across the Rails stack. Before Rails, 3 years writing Java (Spring, REST integrations) and frontend (Angular, React) at Linx/Stone for retail POS systems used by thousands of stores.