Senior Backend Engineer in London

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.

About the role

As a Senior Backend Software Engineer, you will be responsible for the design, development, deployment, and operation of business‑critical features that add customer value on top of voice. Best practices, evangelization, and mentoring in your team and across the whole of Engineering will be part of your day‑to‑day job. Quality, excellence, and agility drive our delivery processes and you will help us level these up.

Using a variety of back‑end stacks, appropriate for each requirement, but always hosted on AWS, we build added value and resilient services on top of voice and fully integrate with our customers’ business critical tools (CRM, Helpdesk, E‑Commerce, ...).

Key Responsibilities

• Participate in requirements analysis to help with providing the right technical and business solutions for our customers
• Have key responsibilities within the design, architecture, and end‑to‑end delivery of key modules
• Write clean scalable code and test and deploy applications and systems
• Revise, update, refactor, and debug code
• Be part of an engineering organization delivering high quality, secure, voice solutions to Aircall clients
• Involvement in product and platform performance optimization and live site monitoring
• Participate in an on‑call rotation to respond to critical system issues and ensure continuous system reliability
• Mentor team members

Qualifications

• You have at least 6+ years of experience in back‑end development in a large scale, typed language, with experience in Typescript, with a focus on delivering for security, scalability, availability, and performance
• You will have worked extensively 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
• You can talk easily and spontaneously about most of the offerings on AWS, when to use them, and how, and can explain to junior engineers.
• You have experience working with serverless services using infrastructure as code like CloudFormation or Terraform.
• Security is at the forefront of your mind in everything that you do.
• And last but not least, if you have experience working with GraphQL it will be a huge plus!

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 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.