Senior Software Engineer

Concentric Recruitment

Barcelona, Spain

4 days ago

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Role details

Contract type

Permanent contract

Employment type

Full-time (> 32 hours)

Experience required

5 years minimum

Compensation

€80,000.0 - €100,000.0

Working hours

Regular working hours

Languages

Spanish

Job source

www.buscojobs.com.es

Tech stack

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

+6 more

Real Time Systems ReactJS Large Language Models Multi-Agent Systems Machine Learning Operations Docker

Job 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 .

Requirements

(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