Full-time

Senior Ruby on Rails Engineer

Posted by OnTheGoSystems • June 09, 2026

📍 Spain, Spain, Spain
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Description

Senior Ruby on Rails Engineer  We are looking for a Senior Ruby on Rails Engineer to help us build reliable, scalable products and apply AI/LLM technologies where they create real value.


This is a hands-on engineering role for someone who can own complex features end to end, make strong technical decisions, and work across backend architecture, production systems, testing, and AI-assisted product development.


You should be excited about AI, but pragmatic enough to know when a simple, deterministic solution is better than an LLM call.


What you’ll be working on: Owning features from technical design to production Building and maintaining Ruby on Rails systems used at scale Designing AI/LLM-assisted features and workflows where they improve product quality or user experience Working with LLM APIs, prompts, retrieval/context strategies, and AI-assisted development tools Making trade-offs around performance, reliability, cost, latency, security, a...

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