About VoiceB We build autonomous AI voice agents that close and qualify sales for large B2C enterprises — telcos, energy providers, insurers, banks.

¿Es usted el solicitante adecuado para esta ocasión? Descúbralo leyendo el resumen del puesto a continuación.

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.The roleWere 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
* 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
* 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 xsgfvud
* Experience with real-time or telephony systems (SIP, WebRTC, Twilio)
* Experience integrating LLMs or other AI/voice tooling into production systems
* Early-stage startup experience What we offer
* Competitive salary + equity
* Fully remote (Spain-based)
* Direct influence over the architecture of a product still being defined Were hiring deliberately, not urgently — wed rather find the right person than fill the seat fast.

If this sounds like your kind of problem, wed love to hear from you.

📌 Senior Full Stack Engineer — Ai Voice Platform (Madrid)
🏢 VOICEB.ai
📍 Madrid