> Markdown version of [/jobs/ext/2724569-c-c-engineer](https://www.wearedevelopers.com/jobs/ext/2724569-c-c-engineer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # C/C++ Engineer - **Company:** Número De - **Location:** Barcelona, Spain - **Contract:** Permanent contract - **Skills:** Java (Programming Language), Application Programming Interfaces (APIs), C++ (Programming Language), CMake, Software Debugging, Software Design Patterns, DevOps, Memory Management, G.711 Standard, Python (Programming Language), Object-Oriented Software Development, PCI Data Security Standards, Memory Leaks, Software Engineering, System Programming, Web Services, WebRTC, OpenSIPS, Multithreading, System Availability, Audio Codec, Git, Information Technology, Build Tools, Kamailio, OPUS (Software), Microservices - **Published:** September 5, 2026 - **Apply:** https://www.adzuna.es/contact-us.html ## About the Role + 5+ years professional experience in C/C++ systems programming, including memory management, multithreading, and low-level debugging. + Experience with Git and C/C++ build systems such as CMake or Meson. + Hands-on experience modifying, compiling, and deploying Asterisk. + Experience writing APIs and/or Web Services & Microservices using C/C++. + Object-oriented analysis and design using common design patterns. + Self-motivated and driven to create extraordinary things. + Ability to work under pressure and on strict deadlines. + Bachelor's degree in Computer Science. + Very good written and oral communication skills in English. + Continuous innovation mindset. Nice to have: + Knowledge of SIP (RFC 3261) and related RFCs (SDP, RTP/RTCP, STUN/TURN/ICE) and practical dialplan authoring experience. + Experience with Java or Python programming. + Familiarity with FreeSWITCH, Kamailio, or OpenSIPS, WebRTC-to-SIP interworking, or call recording/audio codec architectures (G.711, G.729, Opus). + Experience in regulated environments (PCI-DSS, HIPAA) where call recording and redaction requirements apply. ## Description The Senior C/C++ Engineer sits within Omilia's product engineering team, building and maintaining performance-critical systems software that underpins Omilia's conversational AI infrastructure. The role requires strong systems-level programming fundamentals and, ideally, prior exposure to telephony or real-time communications stacks such as Asterisk-based voice platforms, SIP signaling, and dialplan engineering. It is structured to let a strong C/C++ engineer grow into deep telephony specialization over time, with mentorship available from the team's existing SIP experts. Engineers who already bring that expertise are fast-tracked into the specialized workstreams. Accountabilities + Own the design, development, and ongoing support of performance-critical C/C++ components across Omilia's platform. + Own resolution of scalability and performance issues affecting telephony and SIP systems. + Ensure effective time management and consistent delivery against deadlines. + Contribute as an integrated, collaborative team member across engineering and cross-functional teams., + Design, implement, and maintain C/C++ components across Omilia's platform, with emphasis on performance, memory safety, and concurrency correctness in production systems. + Develop efficient applications for mission-critical systems geared for high availability and performance. + Debug complex, multi-threaded, low-level issues using tools such as gdb, valgrind, and/or strace. + Develop, extend, and maintain custom Asterisk modules (res_, chan_, app_*) to support call handling, recording, and routing requirements specific to the platform. + Patch, rebuild, and validate Asterisk core and third-party modules against upstream security advisories and internal hardening requirements. + Identify performance bottlenecks and suggest improvements. + Develop with security principles in mind and scale services with a DevOps mindset. + Meet regularly with the line manager to review progress; manage issue resolution and escalate critically when needed. + Work effectively with other teams, units, and departments, ensuring clear information flow and team working. + Support other organisational priority activities when necessary, and act as an Omilia ambassador. ## Related Videos - [Develop, test and run a communications application in a serverless cloud](https://www.wearedevelopers.com/videos/760-develop-test-and-run-a-communications-application-in-a-serverless-cloud) - [Code to Road in < 12 hours](https://www.wearedevelopers.com/videos/1082-code-to-road-in-12-hours) - [Transforming Education: A Journey from interactive Markdown to Remote-Labs](https://www.wearedevelopers.com/videos/941-transforming-education-a-journey-from-interactive-markdown-to-remote-labs) - [How a Small Team Shrank a Microsoft Monorepo by 94%](https://www.wearedevelopers.com/videos/1236-how-a-small-team-shrank-a-microsoft-monorepo-by-94) - [Raise your voice!](https://www.wearedevelopers.com/videos/10-raise-your-voice) - [Hello JARVIS - Building Voice Interfaces for Your LLMS](https://www.wearedevelopers.com/videos/1641-hello-jarvis-building-voice-interfaces-for-your-llms) ## Related Articles - [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again) - [The 10 C++ programming questions to expect in an interview](https://www.wearedevelopers.com/magazine/50-the-10-c-programming-questions-to-expect-in-an-interview) - [10 Highest Paying Programming Languages 2025](https://www.wearedevelopers.com/magazine/150-10-highest-paying-programming-languages-2025) - [Dev Digest 131 - AI'm not sure about OSS](https://www.wearedevelopers.com/magazine/472-dev-digest-131-ai-m-not-sure-about-oss) - [Dev Digest 138 - Are you secure about this?](https://www.wearedevelopers.com/magazine/486-dev-digest-138-are-you-secure-about-this) - [Dev Digest 121 - AI goes offline](https://www.wearedevelopers.com/magazine/456-dev-digest-121-ai-goes-offline)