Full-Stack Software Engineer (IT-FCS-CT-2026-215-GRAE)

Are you a talented Software Engineer, passionate about developing Web applications using state-of-the-art UX/UI technology? Do you enjoy designing scalable back-end systems for communication systems and working on several layers of the software stack? Work with us to develop and evolve CERN's advanced Network and Telecom infrastructure providing automation solutions for its effective management! The Fabric & Communication Systems (FCS) Group is responsible for all aspects of network and telephony provision at CERN. We support a campus network (cabled and Wi-Fi) with over 50,000 connected devices, a 5Tb/s non-blocking switching fabric for a data centre with over 10,000 servers, more than 4,000 switches with 10Gb/s interfaces, and external connections including multiple trans-border 100Gb/s circuits. The FCS group also operates its own VoIP telephony system, dedicated mobile telephony services (6500 subscriptions), a TETRA digital radio system (500 terminals) and a LoRaWAN network. As a member of the Communication Tools (CT) Section in the FCS Group, you will join a team of passionate Software Engineers in charge of the design, development and maintenance of the software suite used to model, configure, support and manage the CERN networks and telecom infrastructures.

- Contribute to the development of CERN's network automation tools, focusing on faster and more flexible IP address provisioning. A key task will be to work on live DHCP updates, allowing DHCP leases to be configured dynamically and enabling near-instant IP address allocation for users and services. - Extend IP Address Management support for Layer 2 interfaces, improving how network interfaces, devices and IP resources are modelled and managed. This work will involve back-end development, database modelling, API integration and collaboration with network engineers to deliver reliable features for CERN's production network. - Maintain and further develop the IT-FCS Web interfaces use