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 (5 days per week) Overview Our 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.

Key Responsibilities
Build scalable APIs and services for real‑time voice interactions. Develop product features end‑to‑end with React, Type Script and AI infrastructure. Integrate LLM, STT and TTS workflows into production. Work on agentic and multi‑agent workflows. Improve architecture, observability, testing and engineering quality. Collaborate directly with founders and senior team to shape the platform.



Qualifications 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 in Spanish and English. Preferred Experience 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.

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