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. The Team: The Programmable Communications Team is responsible for all technology aspects related to the voice and messaging infrastructure of Aircall products. The team works to deliver high-quality and real-time communications to our users while operating in all areas at carrier-grade expectations (stability, maintainability, scaling, and uptime). Our shared ambition is to provide the best voice and messaging infrastructure for Aircall customers and help other Aircall engineering teams deliver as much value as possible on top of it. Key Responsibilities: • Design and build highly scalable and secure backend services, ensuring high availability, performance, and security to support high-volume workloads • Design and maintain robust CI pipelines (GitLab CI), release workflows, and automated testing to implement continuous delivery best practices in production environments. • Debug and optimize the application's performance, focusing on memory leaks and CPU usage in a desktop environment, critical for maintaining a high audio quality during calls. • Operate, monitor, and optimize distributed systems in AWS production environments • Lead initiatives to improve the reliability, resilience, and performance of our distributed systems, from design through production operation. • Apply a deep understanding of RTC / VoIP architectures and protocols • Participate in an on-call rotation to respond to critical system issues. Qualifications: • You have solid experience building backend services with a strong focus on security, scalability, availability, and performance. • You have strong knowledge of CI/CD pipelines, infrastructure-as-code, automated testing, and deployment best practices. • You have hands-on experience with GitLab CI/CD (or similar), release workflows, code reviews, and continuous delivery in production. • You are proficient in working in containerized environments (Docker, Kubernetes). • You have experience operating and optimising systems in AWS production environments, ideally supporting high-volume, high-availability workloads. • You have the ability to troubleshoot, monitor, and improve distributed systems running in production. • You have an understanding of RTC / VoIP architectures and protocols (SIP, RTP). • You are familiar with open-source SIP/RTC technologies such as FreeSWITCH, Kamailio, Asterisk, or similar. • You have exposure to media servers, signaling flows, or real-time communications debugging. • You stay current with modern development practices and tooling, including AI-assisted development tools, to maximize your productivity • You have strong communication skills and fluency in English (written and spoken). • You are autonomous, proactive, and comfortable owning features end-to-end. • You are pragmatic and have a willingness to experiment, iterate, and continuously improve systems. 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. Want to know more about candidate privacy? Find our Candidate Privacy Notice here.