Job Overview Role: Senior / Principal Software Engineer Sector: Artificial Intelligence

Job Type
Full-Time Salary range: up to €100.000 + Equity Contract type: Direct employment with our client

Location:
Onsite in Barcelona What we are looking for +5-7 years of production experience with modern web stack Production experience with Python, Type Script, Java Script or Go Lang Experience with AI coding agents such as Claude Code, Cursor or Codex Real Product mindset and ability to work autonomously Comfortable with Docker, SQL, testing and scalable architecture Fluent Spanish and English Nice to have Experience with LLMs, STT/TTS, Open AI, Whisper, Eleven Labs or Deepgram Experience with Lang Chain, Lang Graph or similar AI orchestration tools AWS/GCP,



CI/CD and observability experience Startup or early-stage product company experience Previous experience leading a team or acting as a principal What you’ll be doing Building scalable APIs and services for real-time voice interactions Developing product features end-to-end with React, Type Script and AI infrastructure Integrating LLM, STT and TTS workflows into production Working on agentic and multi-agent workflows Improving architecture, observability, testing and engineering quality Working directly with the founders and senior team to shape the platform

📌 Senior Software Engineer (Barcelona)
🏢 Concentric Recruitment
📍 Barcelona