ppRole: Senior / Principal Software Engineer /ppJob Type: Full-Time /ppSalary range: to €100.000 + Equity /ppContract type: Direct employment with our client /ppLocation: Onsite in Barcelona /ppOnly interested in speaking with candidates who are comfortable working from the office 5 days per week /ppOur partner is building next-generation AI-driven communication products that help businesses automate customer interactions, improve operational efficiency and generate actionable insights in real time. /ppThey are now looking for a Senior/ Principal Software Engineer to help scale the platform behind their voice agents, owning features end-to-end across their TypeScript / Python stack and working on AI pipelines, LLM orchestration, STT/TTS, prompt workflows and real-time systems. /ph3What we are looking for /h3ulli+5-7 years of production experience with modern web stack /liliExperience with AI coding agents such as Claude Code, Cursor or Codex /liliReal Product mindset and ability to work autonomously /liliComfortable with Docker, SQL,



testing and scalable architecture /liliFluent Spanish and English /li /ulh3Nice to have /h3ulliExperience with LLMs, STT/TTS, OpenAI, Whisper, ElevenLabs or Deepgram /liliExperience with LangChain, LangGraph or similar AI orchestration tools /liliAWS/GCP, CI/CD and observability experience /liliStartup or early-stage product company experience /liliPRevious experince leading a team or acting as a principal /li /ulh3What you’ll be doing /h3ulliBuilding scalable APIs and services for real-time voice interactions /liliDeveloping product features end-to-end with React, TypeScript and AI infrastructure /liliIntegrating LLM, STT and TTS workflows into production /liliWorking on agentic and multi-agent workflows /liliImproving architecture, observability, testing and engineering quality /liliWorking directly with the founders and senior team to shape the platform /li /ul /p #J-18808-Ljbffr

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