Telephony System Ing. & Telephony Technical Lead (Senior)

Telephony Technical Lead & Systems Engineer (Senior)

Location: Brussels (Hybrid - minimum 3 days on-site)
Start Date: ASAP
Duration: Long-term assignment (2 years+ with possible extensions)
Language Requirements: Fluent French or Dutch, with a strong passive knowledge of the other national language, plus professional English.

About the Opportunity

Our client, a major organization operating critical infrastructure and utility services in Belgium, is seeking an experienced Telephony Technical Lead & Systems Engineer to join its Infrastructure & Operations team.

You will act as the technical expert for IP telephony solutions, supporting both strategic transformation projects and day-to-day operational activities. The role combines technical leadership, solution design, infrastructure expertise, and operational support within a complex enterprise environment.

Key Responsibilities

Project & Transformation Activities

• Design and define telephony infrastructure solutions in collaboration with architects, engineers, and security teams.

• Lead technical decision-making for telephony-related projects.

• Support the modernization and evolution of enterprise telephony platforms.

• Ensure solutions meet requirements for scalability, resilience, security, and performance.

• Coordinate technical activities across multidisciplinary teams.

Operational Activities

• Ensure high availability and performance of telephony services.

• Provide expert support during incidents and complex troubleshooting activities.

• Lead root cause investigations and problem management initiatives.

• Drive continuous improvement and optimization of the telephony environment.

• Act as the go-to expert for telephony technologies and infrastructure services.

Required Skills & Experience

• Minimum 7 years of experience with IP Telephony solutions.

• Proven experience as a Technical Lead within infrastructure or development projects.

• Strong background in Solution Design.

• Recent involvement in IP Telephony projects within the last 2 years.

• Extensive knowledge of:

  • SIP and VoIP technologies

  • Enterprise telephony platforms

  • Routing, switching, and IP networking

  • Firewall management

  • Infrastructure architecture and design

• Experience leading and coordinating technical teams.

• Strong analytical and troubleshooting abilities.

• Fluent communication skills in English and either French or Dutch.

Nice-to-Have Skills

• Experience within the Utilities, Energy, or Critical Infrastructure sector.

• Knowledge of Check Point firewalls.

• Experience with Mitel / MiCollab environments.

• Experience with Solidus solutions.

• Experience with voice recording platforms.

• Development, testing, and debugging experience.

Working Environment

You will join a highly skilled infrastructure department responsible for maintaining and modernizing mission-critical IT and operational technology platforms. The team supports large-scale digital transformation initiatives while ensuring operational excellence and service reliability.

Working Conditions

• Hybrid working model (minimum 3 days on-site).

• Full-time assignment.

• Long-term engagement with strong extension potential.

• Laptop provided.