Senior AI Engineer – Real-Time Voice & Agents (Hybrid)

Concentric Recruitment; Madrid; Híbrido; EUR 80.000 - 100.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Equity

Descripción de la vacante

Concentric Recruitment is seeking a Senior/Principal Software Engineer to join a Barcelona-based hybrid team building AI-driven communication products. The role requires 5+ years in production with modern web tech and fluency in Spanish.

You will develop scalable APIs, real-time voice services, and integrate LLM/AI stacks. Collaboration with founders and senior engineers will shape the platform's architecture and strategy.

Formación

• 5+ years of production experience with a modern web stack.
• Experience with TS/JS/Python or C#.
• Experience with AI coding agents such as Claude Code, Cursor or Codex.
• Fluent Spanish; comfortable working in a hybrid Barcelona setting.

Responsabilidades

• Build scalable APIs and services for real-time voice interactions.
• Develop product features end-to-end with React, TypeScript 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.

Conocimientos

5+ years production experience

TypeScript/JavaScript/Python/C#

AI agents experience

Docker

SQL

Testing

Scalable architecture

Fluent Spanish

Herramientas

LangChain

LangGraph

AWS

GCP

CI/CD

Descripción del empleo

Concentric Recruitment is seeking a Senior/Principal Software Engineer to join a Barcelona-based hybrid team building AI-driven communication products. The role requires 5+ years in production with modern web tech and fluency in Spanish.

You will develop scalable APIs, real-time voice services, and integrate LLM/AI stacks. Collaboration with founders and senior engineers will shape the platform's architecture and strategy.