Network Engineer — BGP/EVPN for GPU Cloud Infra

Circle B; Hoofddorp; On-site; EUR 70,000 - 110,000; Full time

Benefits offered by this job

Company gym

Modern office in Hoofddorp

Informal and open culture

Job summary

Circle B, based in Hoofddorp, NL, seeks a hands-on Network Engineer to own and operate our production network, including core routing, EVPN/VXLAN, and GPU cluster networking. You’ll work on a real ASN, datacenter networking, and drive changes that directly impact customers.

You will build out reliability, implement DDoS mitigation, and extend peering capabilities while maintaining IPv4/IPv6 addressing and subnet workflows. A strong security mindset and proactive documentation are essential.

Qualifications

• Proven experience operating production networks in hosting/datacenter/ISP-like environments.
• Strong practical knowledge of datacenter switching and L2/L3 fundamentals.
• IPv4/IPv6 operations and addressing design.
• Experience owning production changes: planning, validation, rollback thinking, and post-change checks.
• Fluent English (spoken and written).
• Strong hands-on network security experience (firewall policy, segmentation, change discipline, rule hygiene).
• Experience extending EVPN/VXLAN designs beyond day-to-day operations.
• Experience building DDoS mitigation workflows end-to-end.
• Experience driving improvements in low-structure environments.

Responsibilities

• Operate and improve our production network.
• Maintain and evolve our Juniper routing and switching environment.
• Own BGP operations on our ASN: routing policy, filtering, communities, troubleshooting, and traffic engineering.
• Operate EVPN/VXLAN in production and help extend it as we grow.
• Manage IPv4/IPv6 addressing and clean subnet allocation/assignment workflows.
• Lead expansion into internet exchanges and peering: planning, implementation, validation, and turning it into a reliable operational capability.
• Implement routing-security best practices (e.g., RPKI/IRR hygiene and route-leak protections).
• Lead the implementation of a practical DDoS mitigation approach (technology + processes + runbooks).
• Documentation, observability, and operational quality: use NetBox, improve monitoring/alerting, and create/update diagrams and runbooks.
• Be helpful beyond networking when needed: support adjacent infra areas as priorities shift.

Skills

BGP

Juniper

EVPN/VXLAN

IPv4/IPv6

Network security

DDoS mitigation

RDMA/RoCE

GPU cluster networking

Production networking

Cloud/data center networking

Tools

NetBox

Job description

Circle B, based in Hoofddorp, NL, seeks a hands-on Network Engineer to own and operate our production network, including core routing, EVPN/VXLAN, and GPU cluster networking. You’ll work on a real ASN, datacenter networking, and drive changes that directly impact customers.

You will build out reliability, implement DDoS mitigation, and extend peering capabilities while maintaining IPv4/IPv6 addressing and subnet workflows. A strong security mindset and proactive documentation are essential.