About VoiceB

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.

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

- 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

- 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 (España)
🏢 VOICEB.ai
📍 España