Full Stack / Backend Engineer

Las Palmas
Municipality of Las Palmas, Spain
10 days ago

Role details

Contract type
Permanent contract
Employment type
Full-time (> 32 hours)
Working hours
Regular working hours
Languages
English
Experience level
Senior

Job location

Remote
Municipality of Las Palmas, Spain

Tech stack

Artificial Intelligence
Codecs
Python
Node.js
Salesforce
Systems Integration
Twilio
WebRTC
Real-Time Transport Protocol
Chatbots
Large Language Models
Concurrency
Backend
Build Management
Low Latency
Machine Learning Operations
Front End Software Development
Hubspot
Go

Job description

Senior Full Stack / Backend Engineer - Voice & AI Aumente sus posibilidades de llegar a la fase de entrevista leyendo la descripción completa del puesto y enviando su solicitud sin demora. VoiceB | Fully Remote (Spain) | Engineering

We're VoiceB. We're building the autonomous AI voice sales agent that's automating the last undigitized sales channel: the phone call. Top enterprise brands across telco, banking, insurance, energy and automotive are already using our platform to handle inbound B2C and B2B sales conversations end-to-end - qualifying, pitching, and closing without human agents. We're profitable, growing fast, and just getting started. Now we're hiring a Senior Engineer to help us scale the core platform that powers it all.

What you'll do

  • Design and build core systems behind our autonomous voice agent platform - real-time voice pipelines, LLM orchestration, telephony integrations and CRM connectors.
  • Own the voice infrastructure layer: Twilio, SIP trunks, WebRTC, and the real-time audio plumbing that makes a sub-second AI conversation feel human.
  • Ship full stack when needed - backend is your home, but you're comfortable touching the frontend to deliver end-to-end.
  • Work directly with our CTO and a small, senior engineering team where every line of code matters.
  • Integrate with Salesforce, HubSpot, ad platforms (Google, Meta) and enterprise CRMs.
  • Contribute to architecture decisions that will define how voice AI scales over the next 5 years.

Requirements

  • 5+ years building production backend systems (Node.js, Python, Go, or similar).

  • Hands-on experience with Twilio and voice infrastructure - SIP, WebRTC, RTP, codecs, real-time audio. This is non-negotiable.

  • Experience integrating and working with LLMs, STT/TTS pipelines, or AI/ML systems in production.

  • Full stack capability - you can move across the stack when the product needs it.

  • Strong systems thinking: latency, concurrency, reliability at scale.

  • Advanced English (C1+). You'll work daily with enterprise customers and a global team.

  • Hard worker, ownership mindset, comfortable in a high-velocity startup environment.

Nice to have

  • Experience with conversational AI, IVR systems, or contact center platforms.
  • Background in CRM integrations (Salesforce, HubSpot).
  • Previous exposure to enterprise-grade compliance (GDPR, ISO *****, SOC 2).

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