Senior Network Engineer; Enterprise Infrastructure

About Gramian Consultancy

Gramian Consultancy is a boutique consultancy specializing in IT professional services and engineering talent solutions. With a strong background in software engineering and leadership, we help companies build high-performing teams by matching them with professionals who truly fit their needs.

Our client is a global investment organization managing a diversified portfolio across financial services, life sciences, healthcare, digital health, real estate, and infrastructure. Their technology team supports a highly secure, international environment where reliability, scalability, and operational excellence are critical to business success.

We are looking for a Senior Network Engineer to lead the design, implementation, and optimization of a global enterprise network infrastructure
. In this role, you will be responsible for architecting secure, high-performance networking solutions across on-premises and cloud environments while ensuring the availability, resilience, and security of mission-critical systems.

CONTRACT: Permanent (CDI)

COMMITMENT: Full-time

LOCATION: Geneva, Switzerland

PROCESS: Client Interview Process

NOTES:

• Fluent French and English are mandatory
• Participation in an on-call rotation is required
• CCNA certificate mandatory

• Design, implement, and maintain Cisco/HPE enterprise networks, Fortinet security infrastructure, and Azure cloud networking across multiple international locations
• Lead the evolution of hybrid network architectures spanning on-premises data centers and cloud environments
• Manage the lifecycle of network infrastructure, including capacity planning, hardware refreshes, and disaster recovery
• Configure and maintain firewalls, VPNs, and secure network services
• Provide 3rd-line technical support for complex networking incidents
• Collaborate with cybersecurity and infrastructure teams to improve network performance and security
• Manage relationships with telecommunications providers and external technology partners
• Ensure network monitoring, availability, and compliance with operational standards
• Contribute to infrastructure projects, architecture decisions, and continuous improvement initiatives
• Participate in an on-call rotation to support business-critical systems

• 8+ years of experience in enterprise network engineering
• Proven expertise with Cisco and/or HPE Aruba enterprise networking solutions
• Hands-on experience with Fortinet firewalls and network security technologies
• Experience designing and supporting Microsoft Azure networking environments
• Strong expertise in routing, switching, WAN, LAN, WLAN, VPNs, and network security
• Experience troubleshooting complex enterprise network infrastructures
• Professional networking certification (CCNP, JNCIP, Aruba, or equivalent)
• Fluent French and English

• Advanced networking certifications (CCIE, JNCIE, or equivalent)
• Experience with in financial services or highly regulated industries
• Experience with network automation and infrastructure-as-code
• Knowledge of enterprise monitoring and observability platforms
• Experience with disaster recovery and business continuity planning