Software Engineer, Programmable Comms

TL;DR

Software Engineer, Programmable Comms (Backend/VoIP/RTC): Design and build highly scalable, secure backend services for real-time voice and messaging infrastructure with an accent on carrier-grade reliability, performance, and security. Focus on solving distributed-systems challenges in AWS, optimizing RTC/VoIP (SIP/RTP) flows, and improving CI/CD and automated testing for continuous delivery.

Location: Madrid Office (Hybrid)

Company

hirify.global builds customer-obsessed, data-driven communications infrastructure for voice and messaging.

What you will do

• Design and build scalable, secure backend services to support high-volume, high-availability communications workloads.
• Own CI pipelines (GitLab CI), release workflows, and automated testing to enable continuous delivery in production.
• Debug and optimize production performance, including memory leaks and CPU usage affecting call audio quality.
• Operate, monitor, and optimize distributed systems running in AWS production environments.
• Improve reliability, resilience, and performance of distributed systems from design through production operations.
• Participate in an on-call rotation to respond to critical system issues.

Requirements

• Solid backend experience with a focus on security, scalability, availability, and performance.
• Strong knowledge of CI/CD, infrastructure-as-code, automated testing, and deployment best practices.
• Hands-on experience with GitLab CI/CD, release workflows, code reviews, and continuous delivery in production.
• Proficiency with containerized environments (Docker, Kubernetes) and experience operating systems in AWS.
• Ability to troubleshoot, monitor, and improve distributed systems in production.
• Understanding of RTC/VoIP architectures and protocols (SIP, RTP), plus familiarity with open-source SIP/RTC technologies (FreeSWITCH, Kamailio, Asterisk or similar).

Nice to have

• Exposure to media servers, signaling flows, or real-time communications debugging.
• Experience using AI-assisted development tools to improve productivity.

Culture & Benefits

• Customer-obsessed, data-driven environment with ownership and continuous learning.
• Collaborative, fast-moving culture focused on thoughtful speed and meaningful outcomes.
• Hybrid workplace based in the Madrid office.
• Autonomy to own features end-to-end and iterate on systems.

Hiring process

• Interviews and technical evaluation focused on backend, CI/CD, AWS operations, and RTC/VoIP understanding.
• Discussion of ownership, communication, and on-call readiness.