Location: Curitiba, Brazil (UTC−3)
    Remote: Yes (only) with 10+ years remote with US / Canada / EU teams
    Willing to relocate: No
    Technologies: Rust, Smalltalk, Elixir, Python, PostgreSQL, Kafka, Redis, Docker, AWS/GCP; React; agent harnesses / LLM product engineering (not research)
    Résumé/CV: https://sebastiansastre.co/cv · https://www.linkedin.com/in/sebastiansastre/ · https://github.com/sebastianconcept
    Email: sebastianconcept@gmail.com

Recent: Owned Rust incentives/rewards services end to end (lifecycle state machines over 200K+ users, idempotent event-driven payment engine, Kafka). Built a review-gated AI delivery harness that shipped 10+ production features (four in one week in the same codebase).