Ersilia in Barcelona is hiring a senior backend engineer to own a critical production system, contribute to the roadmap, and bring new ideas through experiments. You will work hands-on on a Ruby on Rails stack, ensuring reliability and performance while collaborating with engineering and product teams. The role demands 5+ years of production experience, an AI-first mindset with Cursor/Claude Code/Codex, and an autonomous work style with advanced English.
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📌 Senior Ruby on Rails Backend Engineer - Remote (Madrid)
🏢 Ersilia
📍 Madrid
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