As a member of the Telecom and Radio (TR) Section in the CS Group, you will participate in the development, operation and evolution of CERN’s VoIP (Voice-over-IP) telephony infrastructure and services, and in particular by:

• Contributing to the design, development, integration and maintenance of telephony services based on Open-Source solutions (Asterisk/Kamailio).
• Participating to the phase-out of CERN’s legacy analogue and ISDN telephony infrastructure and its replacement by state-of-the-art, SIP-based mobile and desktop softphone applications.
• Leading the development and deployment of call centre applications for CERN’s control and service centres.
• Ensuring the proper integration of these services within the CERN’s Puppet-based Agile Infrastructure and DevOps tools.
• Participating to daily service management, which includes building and deployment of software packages, performance and availability monitoring, fault analysis and correction, as well as providing engineering-level support.
• Producing procedures and documentation following the ITIL recommendations to be used by technicians and engineers in operational activities.

Required skills include:

• In-depth and hands-on experience in the development, deployment and maintenance of highly-available, clustered distributed computing infrastructures based on open-source packages.
• Experience in the management and operation of scalable, Linux-based, multi-tier web and back-end services.
• Proven experience in the field of complex systems integration involving legacy systems.
• Experience deploying services within cloud-native virtualised environments.
• Good knowledge of SQL, database systems, and their integration with Java/Python based applications.

Additional experience in one or more of the following areas would be an asset:

• Experience in the development and operation of VoIP services using Asterisk, Kamailio, FreeSwitch or OpenSIPS.
• Experience in the management and operation of legacy VoIP systems (such as Alcatel OmniPCX).
• Experience in application testing, deployment and debugging on mobile Android/iOS environments.
• Experience in the design and operation of complex IP-based networks.