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, Whats App, and AI together into one seamless workspace.
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.
How we work at Aircall We're customer-obsessed, data-driven, and focused on delivering meaningful outcomes.
The Role We're looking for a strong Senior Python Engineer who's eager to go beyond traditional backend development.
You're energized by hard technical problems—distributed systems, AI orchestration, architectural trade-offs, performance, and scalability.
It's an opportunity to help build the intelligence layer behind a next-generation autonomous Sales OS.
Key Responsibilities Design and implement production-grade Python services with clean architecture and strong engineering discipline.
Integrate with external Saa S systems (CRMs, dialers, meeting tools, OAuth providers).
Optimize performance, latency, cost, and reliability of AI-driven systems.
Build and orchestrate LLM-powered agents (planning, reasoning, tool usage, memory).




Use AI coding assistants effectively and experiment with AI-augmented development workflows.
Qualifications 7+ years of strong backend engineering experience.
Advanced Python expertise (async, typing, architecture patterns, testing) Experience designing scalable distributed systems.
You design thoughtful, well-architected systems and write clean, high-quality code, with a focus on performance and long-term maintainability.
Experience with GCP (preferred) or AWS.
You actively leverage AI coding assistants and are driven to push the boundaries of AI-augmented engineering.
You thrive in fast-paced startup environments where ownership is real and impact is immediate.
Fluency in English is required; Spanish is a plus.
TechStack Backend: Python, Fast API, Celery, Postgre SQL, uv (package-manager) Frontend: Next JS, Tailwind Dev Ops: Google Cloud, Kubernetes Why join us?
Key moment to join Aircall in terms of growth and opportunities Our people matter, work-life balance is important at Aircall Fast-learning environment, entrepreneurial and strong team spirit 45+ Nationalities: cosmopolite & multi-cultural mindset Competitive salary package & benefits DE&I; Statement At Aircall, we believe diversity, equity and inclusion – irrespective of origins, identity, background and orientations – are core to our journey.
We're committed to ensuring that everyone not only has a seat at the table but is valued and respected at it by providing equal opportunities to develop and thrive.
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📌 Senior Backend Software Engineer - Python (Madrid)
🏢 Aircall
📍 Madrid