RoleSenior / Principal Software EngineerAsegúrese de enviar su solicitud rápidamente para maximizar sus posibilidades de ser considerado para una entrevista. Lea la descripción completa del puesto a continuación.Sector: Artificial IntelligenceJob Type: Full‑TimeSalary range: to €100,000 + EquityContract type: Direct employment with our clientLocation: Onsite in BarcelonaOnly interested in candidates who are comfortable working from the office 5 days per week.About the companyOur 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.Position overviewWe are 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.ResponsibilitiesBuilding scalable APIs and services for real‑time voice interactionsDeveloping product features end‑to‑end with React,



TypeScript and AI infrastructureIntegrating LLM, STT and TTS workflows into productionWorking on agentic and multi‑agent workflowsImproving architecture, observability, testing and engineering qualityWorking directly with the founders and senior team to shape the platformRequired Qualifications5–7 years of production experience with modern web stackProduction experience with Python, TypeScript, JavaScript, or GoLangExperience with AI coding agents such as Claude Code, Cursor or CodexReal product mindset xhfqzwm and ability to work autonomouslyComfortable with Docker, SQL, testing and scalable architectureFluent in Spanish and EnglishNice to haveExperience with LLMs, STT/TTS, OpenAI, Whisper, ElevenLabs or DeepgramExperience with LangChain, LangGraph or similar AI orchestration toolsAWS/GCP, CI/CD and observability experienceStartup or early‑stage product company experiencePrevious experience leading a team or acting as a principal#J-18808-Ljbffr

📌 Senior Software Engineer (Madrid) - Up To €100.000 A Year
🏢 Concentric Recruitment
📍 Madrid