Staff Backend & AI Engineer, Madrid

Aircall is hiring a Staff Backend & AI Engineer, Madrid (Spain). Level rates it ; you can apply on Aircall.

Level's read on this job

Level rates this AI engineer role Builds AI ●●●●: the job is building AI systems.
Tools and skills the posting cites include backend.
Level classifies it as a senior role.
Level lists 76 other open roles at Aircall.

AI in this role

Builds AI-powered voice agents and communication systems as a staff backend and AI engineer.

backend

Aircall is a unicorn, AI-powered customer communications platform used by 22,000+ companies worldwide to drive revenue, resolve issues faster, and scale customer-facing teams. We’re redefining customer communications by bringing voice, SMS, WhatsApp, and AI together into one seamless workspace. Our momentum comes from a simple idea: help teams work smarter, not harder. Aircall’s AI Voice Agent automates routine calls, AI Assist streamlines post-call work, and AI Assist Pro delivers real-time guidance so people can do their best work. The result is higher revenue, faster resolutions, and teams that scale with confidence. Aircall is headquartered in Paris, our European HQ, with a strong North American presence anchored in Seattle, our North American HQ, and teams across Madrid, London, Berlin, San Francisco, New York City, Sydney, and Mexico City. We’ve built a product customers love and a business that’s scaling quickly, backed by world-class investors and driven by rapid AI innovation across multiple product lines. At Aircall, you’ll join a company in motion. We’re ambitious, product-driven, and execution-focused, with visible impact, fast decisions, and real growth. How we work at Aircall: We’re customer-obsessed, data-driven, and focused on delivering meaningful outcomes. We value ownership, continuous learning, and thoughtful speed. If you thrive in a collaborative, fast-moving environment where trust and impact matter, you’ll feel at home here.

How we rate this

Staff Backend & AI Engineer, Madrid at Aircall rates 85 out of 100 for how much of the daily work is AI. That makes it Builds AI (AI Level 4 of 4). The level is about AI in the job, not seniority.

Classification

Builds AI. The job is building AI systems.

●●●● Builds AI80 to 100
●●●○ Works on AI60 to 79
●●○○ Uses AI40 to 59
●○○○ Little AI0 to 39

Levels come from how often the tools, models and workflows of the role are named in the posting itself. Read the description and count the AI tools, models and workflows it names.

Key facts

Staff Backend & AI Engineer, Madrid is an open job at Aircall.
Level rates this role AI Level 4 of 4: Builds AI.
The role is based in Madrid Office.
The job was posted on June 3, 2026.
Seniority: senior.
Applications are handled by Aircall. Apply on Aircall

Prepare for this job

Built from this posting and from similar jobs on Level.

Skills and AI tools this role asks for

Backend

Also common in AI engineer jobs at this level

Python LLM Machine learning AI agents AWS Generative AI

Pay

Typical AI engineer job: $185k

This posting doesn't list pay. Use the typical AI engineer figure when pay comes up. See AI engineer jobs

Questions you could be asked

Tell me about a project where backend was part of your work. What did you do?
How would you decide a model or AI system is ready to ship?
Tell me about a time a model underperformed in production. How did you find out, and what did you change?

Adapt your resume

List these exact terms on your resume: Backend. An applicant tracking system matches the wording, not the idea.
Attach one line of real, concrete experience to at least one of them. A tool named with nothing behind it rarely survives a human read.
Lead with what you built, trained or shipped. This role is judged on the AI system itself, not the tools around it.

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