Role: Senior / Principal Software Engineer
Job Type: Full-Time
Contract Type: Direct employment with our client
Location: Hybrid – Barcelona
Language: Fluent Spanish is required
Visa sponsorship is not available for this role

[Only interested in speaking with candidates who are comfortable working in a hybrid model]

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.

They 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.

5 years of production experience with modern web stack




~ Production experience with TypeScript, JavaScript, Python or C#
~ Experience with AI coding agents such as Claude Code, Cursor or Codex
~ Comfortable with Docker, SQL, testing and scalable architecture
~ Fluent Spanish

AWS/GCP, CI/CD and observability experience
Startup or early-stage product company experience
Developing product features end-to-end with React, TypeScript and AI infrastructure
Improving architecture, observability, testing and engineering quality
Working directly with the founders and senior team to shape the platform

Concentric Recruitment is a boutique recruitment firm focused primarly on recruitment for Cloud, DevOps and AI Engineering roles.

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