Full Stack Developer (Senior)

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.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.Build and ship features across the platform: backend services, APIs, third-party integrations (Salesforce, HubSpot, Twilio, SIP/WebRTC), and internal toolingOwn features end to end - design, build, test, deploy, monitor4+ 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~ Experience with real-time or telephony systems (SIP, WebRTC, Twilio)Early-stage startup experienceFully remote (Spain-based)

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 ~ Experience with real-time or telephony systems (SIP, WebRTC, Twilio) Early-stage startup experience

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. 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. Build and ship features across the platform: backend services, APIs, third-party integrations (Salesforce, HubSpot, Twilio, SIP/WebRTC), and internal tooling