Contract: Staff Full-Stack Engineer at Upwork

This role is designed for a seasoned Full-Stack Engineer with at least 8 years of experience who thrives in the "zero-to-one" phase of product development. The ideal candidate is a system-level thinker comfortable with ambiguity, capable of moving between backend (Java/Python) and frontend (Vue/JS) while integrating machine learning and LLM components into production-ready architectures. As a contract position through Upwork’s Hybrid Workforce Solutions, this is a 100% remote opportunity specifically targeting talent in Latin America. You’ll be at the forefront of AI innovation, helping evolve a global marketplace from simple recommendations to autonomous, agentic matchmaking. While this is a high-level individual contributor role, you will have significant architectural influence and mentorship responsibilities without the burden of direct people management. **You might be a good fit if you...** * Have a deep background in architecting complex systems involving ML, search, or recommendation engines. * Are excited about AI-powered programming and have foundational knowledge of how LLMs function. * Prefer a "Staff" level scope where you own the technical roadmap and cross-functional execution. * Are based in Latin America and looking for a high-impact, full-time remote engagement.