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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 we're mid-rollout across an 8-market European deployment with Alpega/Teleroute. We're a small team moving fast, and we're building the commercial engine to match the product. The role We're 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 you'll 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 we're 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 We're hiring deliberately, not urgently — we'd rather find the right person than fill the seat fast. If this sounds like your kind of problem, we'd love to hear from you.