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Staff Backend & AI Engineer, Madrid

Aircall· Engineering
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Hybrid (Madrid)Permanent Full Time EmployeePosted 4mo ago

About the role

Aircall is hiring a Staff Backend & AI Engineer in Madrid to design, develop, deploy, and operate business-critical AI features, including chatbots, virtual assistants, and NLP-powered tools, using LLMs and AI frameworks. The role includes mentoring, best practices, on-call responsibilities, and driving quality and performance across AI-driven modules.

Responsibilities

  • Collaborate on requirements analysis to design the right technical and business solutions for our customers.
  • Propose innovative solutions by staying ahead of AI landscape trends and emerging technologies.
  • Own key responsibilities in the design, architecture, and end-to-end delivery of AI-driven modules.
  • Write clean, scalable, and maintainable code while ensuring proper testing, deployment, and monitoring.
  • Continuously improve code quality through regular refactoring, debugging, and performance enhancements.
  • Contribute to building secure, high-quality AI solutions that power Aircall’s customer experience.
  • Optimize product and platform performance and ensure reliability through live site monitoring.
  • Participate in an on-call rotation to handle critical incidents and maintain system uptime.

Qualifications

  • AI experience is a must for this position: Strong knowledge of LLMs and hands-on experience building with them - including usage, prompting and model integration.
  • Familiarity with AI frameworks (e.g., LangChain, LlamaIndex, AutoGen) and modern AI architectures such as RAG, vector databases, reranking, and performance optimization.
  • 5+ years of experience in back-end development using Python, TypeScript/Node.js, or Java, with a focus on security, scalability, availability, and performance.
  • Full-stack development experience is a strong plus.
  • Ideally you will have worked with AWS in a production environment and understand how to design for, deploy on and get the best out of, the environment and services provided by Amazon.
  • Security is at the forefront of your mind in everything that you do.

Skills

Required:AI/LLM developmentAI frameworks

Benefits

  • Medical, dental, and vision insurance is 100% covered
  • 401k plan with company matching
  • Unlimited PTO — take the time you need to come to work feeling great!
  • Wellness, commuter, and childcare reimbursements
  • Generous parental leave policy
  • Competitive salary package & benefits
Last updated Jul 1, 2026. Interested? Apply on the company site.
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About Aircall

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Aircall is more than a business phone—it’s an integrated customer communications and intelligence platform. Achieve more with AI Agents, data-driven insights, and automation.

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