Senior Telecom Engineer

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About us
Legos was born from a simple idea: to make telecoms accessible. We have created a platform allowing the convergence of fixed, mobile, voice, SMS and also data, all in white label. Today, Legos is declared as a voice and messaging operator in 19 European countries. Multicultural, innovative and ambitious, Legos aims to become the number 1 converged operator by breaking down the boundaries of telecoms. Agile and positioned in Carriers segments, Legos is growing fast. Joining us means participating in a strong human experience and a meaningful business project As a Senior Telecom engineer, the candidate will join the Engineering team and report to the Engineering Director. About the Engineering team The Engineering team is responsible for the design, architecture, and infrastructure of the Legos platform: backbone and network core, OSS, BSS, and R&D. Its mission is to design the systems and to improve them. Engineering gets involved when the design of a system must be modified and to build new products/services. 🚀

Key Responsibilities
The Senior Telecom Engineer's core responsibilities will be to lead engineering projects in three focus areas:
• Resilience and redundancy: design masking and workaround scenarios and add the missing redundancies through a more resilient architecture
• Capacity planning and network architecture: anticipate growth and design the evolutions of the infrastructure and of the network architecture accordingly
• Keeping the platform up to date: plan and drive the migrations and upgrades of systems and virtualization environments (VMware ESX, Proxmox) Within these focus areas, the Senior Telecom Engineer's main objectives will be to:
• Continue the migration to Proxmox
• Design and deploy the replacement of the VxRail solution
• Identify and eliminate single points of failure
• Review the backup process and the retention logic for databases Once these core projects are on track, the Senior Telecom Engineer will support:
• The development of new services, in liaison with Product Management
• Customer onboarding, alongside the Customer Journey team
• Customer support, in assistance of Customer Operations team Within the Engineering team, the Senior Telecom Engineer will act as:
• A reference for the Linux systems and the Proxmox and VMware ESX virtualization environments
• A reference for reproductible infrastructure (infrastructure as code, documentation, least privilege) Within the technical teams, the Senior Telecom Engineer will regularly be required to:
• Perform planned maintenance operations outside business hours, in average 1 to 2 times a month, either to put into production the evolutions designed by the team or to update the infrastructure
• Take part in the on-call duty
• Travel to the data centers hosting our infrastructure to keep the racks in operational condition 🎖️Required Profile & Qualifications
• Engineering degree in telecom networks and systems
• First experience (3 years minimum) in a highly available technical environment
• Solid Linux administration (Rocky Linux, Debian family); knowledge of Proxmox or VMware ESX
• Ability to design and document resilient architectures (redundancy, capacity planning)
• Networking basics (TCP/IP, VLAN, routing, DNS) and scripting (Bash, Python)
• Knowledge of VoIP/SIP or telecom networks is a plus
• Fluent English, spoken and written
• Motivated, autonomous, rigorous, and versatile; available for out-of-hours operations, on-call duty and data center travel ⚙️Recruitment Process
• HR screening and interview
• Interview led by the Director of Engineering (on-site)
• Interview with the CTO (on-site)
• Interview with the Founder & CEO (on-site)