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# Senior Fullstack Developer - Js

- **Company:** Voiceb Ai
- **Location:** Arbo, 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, Backend, Integration Frameworks, Hubspot
- **Published:** September 18, 2026
- **Apply:** https://www.buscojobs.com.es/senior-fullstack-developer-js-en-arbo-ID-371412121

## About the Role

4+ years of full stack experience, comfortable owning features end to end on a small, fast-moving xqziphu 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 xbhjioe with real-time or telephony systems (SIP, WebRTC, Twilio)
Early-stage startup experience

## Description

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 toolingDescubra exactamente qué habilidades, experiencia y cualificaciones necesitará para tener éxito en este puesto antes de enviar su solicitud a continuación.Own 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 xqziphu 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 xbhjioe with real-time or telephony systems (SIP, WebRTC, Twilio)Early-stage startup experienceFully remote (Spain-based)