Senior Backend Software Engineer - Python

About the Position

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.

We’re looking for a strong Senior Python Engineer who’s eager to go beyond traditional backend development. This role is for someone ambitious-someone who takes pride in building things well, but knows how to move fast in a startup environment. You strike the right balance between clean architecture and pragmatism, between perfection and progress.

You’re energized by hard technical problems-distributed systems, AI orchestration, architectural trade-offs, performance, and scalability. You can go deep when needed, but you’re equally focused on shipping, learning, and iterating quickly.

You’re curious by nature, committed to continuous improvement, and excited to bring the most effective modern approaches-whether agentic patterns or AI-augmented development workflows-into real-world production.

This isn’t just another engineering role. It’s an opportunity to help build the intelligence layer behind a next-generation autonomous Sales OS.

Responsibilities

• Design and implement production-grade Python services with clean architecture and strong engineering discipline.
• Architect scalable, distributed systems using Domain-Driven Design (DDD) principles.
• Integrate with external SaaS 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).
• Develop internal frameworks to manage:
  • Agent coordination
  • Tool execution
  • Memory layers
  • Event-driven workflows
• Work closely with AI engineers, product, and founders to transform complex sales workflows into autonomous processes.
• Use AI coding assistants effectively and experiment with AI-augmented development workflows.

Requirements

• 7+ years of strong backend engineering experience.
• Advanced Python expertise (async, typing, architecture patterns, testing).
• Experience designing scalable distributed systems.
• Experience with GCP (preferred) or AWS.
• You design thoughtful, well-architected systems and write clean, high-quality code, with a focus on performance and long-term maintainability.
• Mindset: You’re energized by building systems that can reason and take action-not just generate responses.
• You actively leverage AI coding assistants and are driven to push the boundaries of AI-augmented engineering.
• Strong communication skills are essential-you’ll collaborate closely with Product, Design, and Business stakeholders, and stay deeply connected to our users and the problems they’re trying to solve.
• Fluency in English is required; Spanish is a plus.

Tech Stack

• Backend: Python, FastAPI, Celery, PostgreSQL, uv (package-manager)
• Frontend: NextJS, Tailwind
• DevOps: Google Cloud, Kubernetes

We Offer

• Competitive salary package & benefits
• Fast-learning environment, entrepreneurial and strong team spirit
• 45+ Nationalities: cosmopolite & multi-cultural mindset
• Work-life balance is important at Aircall

About the Company

At Aircall, we believe diversity, equity, and inclusion – irrespective of origins, identity, background, and orientations – are core to our journey. We pride ourselves on promoting active inclusion within our business to foster a strong sense of belonging for all. We’re working to create a place filled with diverse people who can enrich and learn from one another. 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.

We will constantly challenge ourselves to make sure that we live up to our ambitions around diversity, equity, and inclusion, and keep this conversation open. Above all else, we understand and acknowledge that we have work to do and much to learn.

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DE&I Statement:

At Aircall, we believe diversity, equity, and inclusion – irrespective of origins, identity, background, and orientations – are core to our journey.

We pride ourselves on promoting active inclusion within our business to foster a strong sense of belonging for all. We’re working to create a place filled with diverse people who can enrich and learn from one another. 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.

We will constantly challenge ourselves to make sure that we live up to our ambitions around diversity, equity, and inclusion, and keep this conversation open. Above all else, we understand and acknowledge that we have work to do and much to learn.

Want to know more about candidate privacy? Find our Candidate Privacy Notice here.

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.