Senior AI Platform Engineer - Real-Time TS/Python

Concentric Recruitment; Barcelona; Hybrid; EUR 90,000 - 130,000; Full time

Job summary

Concentric Recruitment partners with a client building next-generation AI-driven voice solutions. We seek a Senior/Principal Software Engineer to own features end-to-end on a TypeScript/Python stack in a hybrid Barcelona environment.

You will build scalable APIs for real-time voice interactions, integrate LLM workflows, STT/TTS, and work closely with founders and senior leaders to scale the platform.

Qualifications

• 5+ years of production experience with modern web stack.
• Experience with AI coding agents (Claude Code, Cursor, Codex).
• Ability to work autonomously and drive features end-to-end.
• Comfort with Docker, SQL, testing and scalable architecture.
• Fluent Spanish language required.

Responsibilities

• Building scalable APIs and services for real-time voice interactions.
• Developing product features end-to-end with React, TypeScript and AI infrastructure.
• Integrating LLM, STT and TTS workflows into production.
• Working on agentic and multi-agent workflows.
• Improving architecture, observability, testing and engineering quality.
• Working directly with the founders and senior team to shape the platform.

Skills

5+ years experience

AI coding agents

Docker

SQL

Testing

Spanish fluent

Tools

React

TypeScript

Python

LLM orchestration

OpenAI/Whisper

Job description

Concentric Recruitment partners with a client building next-generation AI-driven voice solutions. We seek a Senior/Principal Software Engineer to own features end-to-end on a TypeScript/Python stack in a hybrid Barcelona environment.

You will build scalable APIs for real-time voice interactions, integrate LLM workflows, STT/TTS, and work closely with founders and senior leaders to scale the platform.