Senior AI Fullstack Engineer - SD, Remote: Colombia - Costa Rica, Fulltime

- This position is open to candidates located in Colombia or Costa Rica only - You'll build new product features on top of LLMs, including agents, retrieval systems, and the workflows around them, and you'll use AI tooling heavily to do it. This is a greenfield role on a small, fast-moving team. Requirements arrive loosely defined, you help define them, and you own what you ship from prototype to production. Our first major milestone lands 60 days out, so you should expect to be contributing code in week one and shipping something real well before your first quarter is up. What you'll do Design and ship user-facing features backed by LLMs, including evaluation, failure handling, and cost management Make architectural decisions and defend them, weighing tradeoffs across speed, cost, complexity, and risk Build systems that stay fast and available as usage grows, with sensible latency budgets, graceful degradation, and no single points of failure Handle PII and financial data responsibly, thinking through what data flows where, what reaches a model provider, and what the failure modes look like Build the automation and data pipelines those features depend on Own deployment and operation of your services Help set the team's direction on AI tooling and approach Required Qualifications Strong Full Stack development experience with JavaScript and TypeScript. Exposure to or experience with Go is a plus. Senior-level software engineering experience. You can design a system, review som