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# Senior Software Engineer

- **Company:** Concentric Recruitment
- **Location:** Barcelona, Spain
- **Salary:** €80,000.0 - €100,000.0
- **Contract:** Permanent contract
- **Skills:** JavaScript (Programming Language), Artificial Intelligence, Amazon Web Services, C Sharp (Programming Language), Cloud Computing, Continuous Integration, Cursor (Graphical User Interface Elements), DevOps, Python (Programming Language), SQL Databases, TypeScript, AI Infrastructure, Real Time Systems, ReactJS, Large Language Models, Multi-Agent Systems, Machine Learning Operations, Docker
- **Published:** September 26, 2026
- **Apply:** https://www.buscojobs.com.es/senior-software-engineer-en-barcelona-ID-372897581

## About the 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.
What we are looking for
+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
Real Product mindset and ability to work autonomously
Comfortable with Docker, SQL, testing and scalable architecture
Fluent Spanish
Nice to have
Experience with LLMs, STT/TTS, OpenAI, Whisper, ElevenLabs or Deepgram
Experience with LangChain, LangGraph or similar AI orchestration tools
AWS/GCP, CI/CD and observability experience
Startup or early-stage product company experience
Previous experince leading a team or acting as a principal
What you'll be doing
Building scalable APIs and services for real-time voice interactions
Developing product features end-to-end with React, TypeScript and AI infrastructure

## Description

Role:Senior / Principal Software EngineerSector: Artificial IntelligenceJob Type: Full-TimeSalary: €80,000-€100,000 + EquityContract Type: Direct employment with our clientLocation: Hybrid - BarcelonaLanguage: Fluent Spanish is requiredVisa 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.What we are looking for+5 years of production experience with modern web stackProduction experience with TypeScript, JavaScript, Python or C#Experience with AI coding agents such as Claude Code, Cursor or CodexReal Product mindset and ability to work autonomouslyComfortable with Docker, SQL, testing and scalable architectureFluent SpanishNice 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 experince leading a team or acting as a principalWhat you'll be doingBuilding 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 platformWhat You Need To Do NextIf this role sounds interesting, and you think you have the required experience, please contact me directly.Email: | Follow meConcentric Recruitment is a boutique recruitment firm focused primarly on recruitment for Cloud, DevOps and AI Engineering roles.For the latest jobs and career opportunities follow our LinkedIn page .


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