Freelance Senior Network Engineer - Long‑Term On‑Site Assignment (Antwerp)

A leading financial organization is looking for a Freelance Senior Network Engineer to strengthen and evolve its enterprise network and security environment. You will work on architecture, lifecycle management, deep‑dive engineering, and complex troubleshooting in a stable, high‑quality setting.

Responsibilities

• Design, maintain, and improve enterprise network and security architecture
• Create HLD/LLD designs and support modernization initiatives
• Configure and operate routing, switching, firewalls, and load balancers
• Troubleshoot multilayer issues using packet flows and performance analysis
• Lead lifecycle management, migrations, and infrastructure upgrades
• Act as senior escalation point for incidents and problem management
• Contribute to security controls (NGFW, IDPS, NAC, WAF, Zero Trust) and compliance
• Maintain documentation and drive automation initiatives

Qualifications

• Minimum 6–7 years of experience as a Network Engineer in an enterprise environment
• MUST‑HAVE: Palo Alto Firewalls
• MUST‑HAVE: Juniper Switching (EX/QFX)
• MUST‑HAVE: Juniper SRX
• MUST‑HAVE: F5 LTM & F5 ASM
• Strong knowledge of routing, switching, load balancing, VPNs, and security protocols
• Experience with packet analysis, performance tuning, and traffic engineering
• Knowledge of EVPN/VXLAN, BGP, Azure Networking, Infoblox, or Cloudflare is a plus
• Strong analytical and communication skills; able to coach and guide others
• Fluency in English required; Dutch is a strong plus

What’s Offered

• Long‑term full‑time on‑site assignment in Antwerp (5 days per week on site)
• Stable, collaborative engineering environment with low turnover
• Opportunities for continuous learning and technical ownership
• A culture built on trust, professionalism, and long‑term vision