Senior Full Stack Engineer — Ai Voice Platform

We build autonomous AI voice agents that close and qualify sales for large B2C enterprises — telcos, energy providers, insurers, banks. Our agents already run live inside companies like Vodafone España and Holaluz, and were mid-rollout across an 8-market European deployment with Alpega/Teleroute. Were a small team moving fast, and were building the commercial engine to match the product.

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The role

Were looking for a senior full stack engineer to join a small, high-ownership engineering team building the core VoiceB platform — the systems behind SuperVoice, SuperQualification, Memory, and our outcome tracking. This is a remote role for someone based in Spain, working closely with our CTO and the rest of engineering.

What youll do

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• Build and ship features across the platform: backend services, APIs, third-party integrations (Salesforce, HubSpot, Twilio, SIP/WebRTC), and internal tooling
  
• Own features end to end — design, build, test, deploy, monitor
  
• Partner directly with the CTO and founders on architecture decisions as the platform scales
  
• Contribute to security and compliance hardening for enterprise clients
  

What were looking for

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• 4+ years of full stack experience, comfortable owning features end to end on a small, fast-moving team
  
• Strong in a modern JS/TS stack (React/Node or similar); comfortable with cloud infrastructure (AWS/GCP)
  
• Based in Spain, fully remote, able to overlap with Barcelona working hours
  
• Product-minded — you care about what gets built, not just how
  

Nice to have

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• Experience with real-time or telephony systems xqbhyrx (SIP, WebRTC, Twilio)
  
• Experience integrating LLMs or other AI/voice tooling into production systems
  
• Early-stage startup experience
  

What we offer

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• Competitive salary + equity
  
• Fully remote (Spain-based)
  
• Direct influence over the architecture of a product still being defined
  

We're hiring deliberately, not urgently — we'd rather find the right person than fill the seat fast.

Senior Full Stack Engineer — AI Voice Platform Galicia, ES