Hybrid Software Engineer – Programmable Comms

at Aircall

• Job title: Software Engineer – Programmable Comms
• Job type: Full Time
• Experience level: Mid level, Senior
• Salary: Not specified
• Degree requirement: Bachelor's Degree
• Tech skills: AWS, Distributed Systems, Docker, Kubernetes, TypeScript, VoIP
• Location requirements: Hybrid, Madrid, Spain

About the role

• Software Engineer designing backend services for AI-powered customer communications platform managing voice and messaging infrastructure.

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
• Apply a deep understanding of RTC / VoIP architectures and protocols
• Participate in an on-call rotation to respond to critical system issues.

Requirements

• You have solid experience building backend services (preferably in TypeScript) 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.

Benefits

• Work-life balance is important at Aircall
• Competitive salary package & benefits