Senior Ruby on Rails + AI Engineer (Remote)

OnTheGoSystems in Lisbon is seeking a Senior Ruby on Rails Developer to own features from design to production and to help apply AI/LLM technologies where they add value.

You’ll build and maintain Rails systems at scale, design AI-assisted workflows, work with LLM APIs and prompts, and balance performance, reliability, cost, latency, and security.

This hands-on role emphasizes strong testing habits, long-term code quality, and a collaborative, ownership-driven engineering culture.