Backend Engineer

TuoTempo; Barcelona; A distancia; EUR 40.000 - 65.000; Jornada completa

Descripción de la vacante

A tech company in Spain is seeking a Backend Engineer to lead the development of their AI-powered voicebot and chatbot platform. The role involves migrating to a modern architecture, integrating APIs, and ensuring seamless communication for backend services. Candidates should have extensive experience with Python and modern backend frameworks. The company offers remote work options and comprehensive private health insurance.

Servicios

100% remote work

Stock options plan

Extra day off for birthday

Comprehensive private health insurance

Flexible compensation platform

Gym & wellness network membership

Formación

• 3+ years of experience in Backend Engineering, preferably in Python, Node.js or similar languages.
• Proven skills in building real-time APIs (websockets, streaming, etc.) and familiarity with async programming.
• Strong experience with modern backend frameworks (FastAPI, Flask, Django, etc.) and with AI / ML frameworks.

Responsabilidades

• Architect, develop, and maintain scalable, robust backend services for voice and chat AI applications.
• Lead the migration from PHP / HTTP to a real-time backend framework.
• Design, build, and maintain multi-agent orchestration frameworks for AI-powered conversations.

Conocimientos

Backend Engineering

Real-time APIs

Python

Node.js

Async programming

AI / ML frameworks

Twilio

WhatsApp

Database technologies

Strong communication

Herramientas

FastAPI

Flask

Django

Docker

AWS

GCP

Azure

Descripción del empleo

Job Description

We are seeking a talented Backend Engineer to help us architect and build the next iteration of our AI-powered voicebot and chatbot platform. You will drive the migration from our current PHP / HTTP stack to a modern, scalable, real-time architecture, unlocking new capabilities and performance for our conversational AI products. You’ll collaborate closely with AI engineers, product managers, and the broader engineering team.

Responsibilities

• Architect, develop, and maintain scalable, robust backend services for voice and chat AI applications.
• Lead the migration from PHP / HTTP to a real-time backend framework.
• Integrate 3rd party APIs such as Twilio (voice), WhatsApp, ElevenLabs, OpenAI and others.
• Implement real-time communication features (websockets, streaming), conversation relays, and advanced voice capabilities.
• Design, build, and maintain multi-agent orchestration frameworks for AI-powered conversations.
• Collaborate on CI / CD pipelines, ensure robust monitoring, logging, and operational support.
• Write clear documentation and support knowledge transfer within the team.
• Work with AI / LLM engineers to facilitate seamless integration of AI modules.

Qualifications

Must-have :

• 3+ years of experience in Backend Engineering, preferably in Python, Node.js or similar languages
• Proven skills in building real-time APIs (websockets, streaming, etc.) and familiarity with async programming.
• Strong experience with modern backend frameworks (FastAPI, Flask, Django, etc.) and with AI / ML frameworks (Langchain, Langgraph)
• Hands-on experience working with LLMs (preferablyOpenAI) and knowledge of MCP.
• Experience integrating with 3rd party communications APIs. Previous experience with Twilio and / or Whatsapp is highly desirable.
• Experience with voice technology APIs and speech synthesis (e.g., ElevenLabs, Google TTS). Experience with conversational interfaces is highly desirable.
• Experience in integrating LLMs and exposure to multi-agent architectures.
• Familiarity with database technologies (SQL and NoSQL).
• Strong communication and collaboration skills.

Nice-to-have :

• Experience working with containerization (Docker) and cloud infrastructure (AWS, GCP, or Azure).
• Experience in CI / CD, DevOps processes, and testing tools.
• Previous work migrating legacy systems to modern stacks.
• Experience with conversational AI, chatbots, or voice assistants
• Experience with real-time speech processing, TTS / STT, and telephony systems and PBXs (Asterisk, FreePBX, etc.)

Additional Information

✨ What we offer :

We value a healthy work-life balance and long-term growth. Benefits vary by location, but here’s what you can expect :

Shared benefits

• 100% remote work, with the option to join our offices in Bologna or Barcelona
• Stock options plan after 6 months
• One extra day off for your birthday
• Access to iFeel – our mental wellbeing platform

Italy-specific

• ️ €8 / day meal vouchers – lunch is covered if you're in the Bologna office
• Private health coverage via Metasalute

Spain-specific

• ❤️ Comprehensive private health insurance with Adeslas
• Flexoh – flexible compensation platform
• Wellhub – gym & wellness network membership
• Language courses

How does the recruitment process work?

• Online test – online async exercise to get a first sense of your tech skills.
• HR interview – a friendly chat to get to know you, your motivations, and tell you more about Tuotempo, our culture, and the team.
• Technical interview – with our TechManagers, including practical exercises to evaluate your approach and problem-solving skills as a developer.
• Final interview — a broader conversation to align on expectations and future growth. If it’s a match, we’ll move forward with the offer!