Exciting New Career Opportunity: Software Engineer - Quality & AI Infrastructure Company: Hirebus Location: Remote in Brazil Pay: $30K-$60K per year We're hiring a mid-level engineer to own two things: the quality of our codebase and the early foundations of our AI agent work. The role Most of your time will be spent making our existing software more reliable. You'll dig into production bugs, trace them to root cause, and write the tests that should have caught them. You'll review pull requests in a way that raises the bar without demoralizing anyone. You'll tackle the tech debt that everyone complains about in retros but nobody picks up. The other part — and this is growing — is our AI agent work. We're building tooling, orchestration, and evaluation systems for LLM-powered features. This isn't a research project. It's production software that needs the same rigor as everything else we ship. We need someone who can bring that rigor. What you'll do Debug and fix issues across the stack, from staging through production Build meaningful test coverage (the kind that actually catches regressions) Review code thoroughly — with context, not just style nits Refactor the parts of the codebase that slow the team down Help define how we ship: observability, release process, quality gates Work with product and design to land features cleanly Contribute to our AI agent infrastructure: tool-calling, orchestration, evaluation, safety Technical Requirements 7+ years of professional engineering experience with a track record of shipping production SaaS products Expert in Node.Js, React, and TypeScript with strong product architecture instincts (scalability, maintainability, speed of iteration) Hands-on Supabase experience: Postgres schema design, RLS policies, edge functions, and auth Shipped produ