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# Senior Full Stack Engineer - Ai Voice Platform

- **Company:** Voiceb Ai
- **Location:** Sevilla, Spain (Remote available)
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, Amazon Web Services, Cloud Computing, Session Initiation Protocols, Node.Js, Salesforce.Com, Twilio, WebRTC, ReactJS, Large Language Models, Backend, Integration Frameworks, Hubspot
- **Published:** September 7, 2026
- **Apply:** https://www.buscojobs.com.es/senior-full-stack-engineer-ai-voice-platform-en-sevilla-ID-369799491

## About the Role

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

## Description

About VoiceBWe 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 roleWe'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 doBuild 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, monitorPartner directly with the CTO and founders on architecture decisions as the platform scalesContribute to security and compliance hardening for enterprise clientsWhat we're looking for4+ years of full stack experience, comfortable owning features end to end on a small, fast-moving teamStrong 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 hoursProduct-minded - you care about what gets built, not just howNice to haveExperience with real-time or telephony systems (SIP, WebRTC, Twilio)Experience integrating LLMs or other AI/voice tooling into production systemsEarly-stage startup experienceWhat we offerCompetitive salary + equityFully remote (Spain-based)Direct influence over the architecture of a product still being definedWe'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.


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