Backend Engineer Jobs

Backend Engineer

DocPlanner GmbH

Location:
Spain , Barcelona

Category:
IT - Software Development

Contract Type:
Not provided

Salary:

Not provided

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Job Description:

We are seeking a talented Backend Engineer to help us architect and build the next iteration of our AI-powered products. You will drive the innovation of our AI integration and build modern, scalable, real-time architecture, unlocking new capabilities and performances, starting from our conversational AI products. You’ll collaborate closely with AI engineers, product managers, and the broader engineering team.

Job Responsibility:

Architect, develop, and maintain scalable, robust backend services, starting from our voice and chat AI applications
Experiment with new technologies to achieve real-time and seamless integrations, implementing POCs to try the latest trends in AI environment, partnering with AI/LLM engineers
Integrate 3rd party API integration such as Twilio (voice), WhatsApp, ElevenLabs, OpenAI and others
Implement real-time communication features (websockets, streaming), conversation architectures, and advanced voice capabilities
Design, build, maintain, and improve 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

Requirements:

3+ years of experience in OOP Backend Engineering
Proven skills in building real-time APIs (websockets, streaming, etc.) and familiarity with async programming
Hands-on experience integrating LLMs (preferably OpenAI), knowledge of MCP and exposure to multi-agent architectures
Experience integrating with third party communications APIs. Previous experience with Twilio and/or Whatsapp is highly desirable
Experience with database technologies (SQL and NoSQL), caching techniques and performance tuning
Experience with automated testing tools at various levels (unit testing, integration testing, e2e testing)
Strong communication and collaboration skills

Nice to have:

Experience working with containerization (Docker) and cloud infrastructure (AWS, GCP, or Azure)
Experience with conversational AI frameworks (chatbot, voice assistant) and with AI/ML frameworks (LangChain, LangGraph)
Experience integrating with 3rd party communications APIs. Previous experience with Twilio and/or Whatsapp is highly desirable
Previous work migrating legacy systems to modern stacks
Experience with real-time speech processing, TTS/STT, and telephony systems and PBXs (Asterisk, FreePBX, etc.)

What we offer:

100% remote work, with the option to join our offices in Bologna or Barcelona
One extra day off for your birthday
Access to iFeel – our mental wellbeing platform
€8/day meal vouchers – lunch is covered if you're in the Bologna office
Private health coverage via Metasalute
Comprehensive private health insurance with Adeslas
Flexoh – flexible compensation platform
Wellhub – gym & wellness network membership
Language courses

Additional Information:

Job Posted:
December 26, 2025

Employment Type:

Fulltime

Work Type:

Remote work

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