Senior Full Stack Engineer — Ai Voice Platform

Voiceb.Ai; Valladolid; A distancia; EUR 90.000 - 120.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Competitive salary + equity

Fully remote (Spain-based)

Descripción de la vacante

VoiceB.Ai is seeking a Senior Full Stack Engineer to join a small, high-ownership team building the core VoiceB platform. This remote role is intended for someone based in Spain, working closely with our CTO and engineering team.

You will develop features across backend services, APIs, and integrations, own end-to-end delivery, and influence architecture decisions as the platform scales. A product-minded mindset is essential.

Formación

• 4+ years of full stack experience required.
• Strong in a modern JS/TS stack (React/Node or equivalent).
• Cloud infrastructure experience with AWS or GCP.
• Based in Spain and able to overlap with Barcelona working hours.

Responsabilidades

• Build and ship platform features: backend services, APIs, integrations, and tooling.
• Own features end to end from design to deployment and monitoring.
• Collaborate on architecture decisions with CTO and founders as the platform scales.
• Contribute to security and compliance hardening for enterprise clients.

Conocimientos

Full stack

JavaScript/TypeScript

React

Node.js

AWS

GCP

Herramientas

Salesforce

HubSpot

Twilio

SIP/WebRTC

Descripción del empleo

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

We're hiring deliberately, not urgently — we'd rather find the right person than fill the seat fast.

Senior Full Stack Engineer — AI Voice Platform Galicia, ES