Operate and improve production network infrastructure including BGP, Juniper routing, and EVPN/VXLAN in a sovereign EU GPU cloud environment. Lead the expansion of internet exchanges, peering, and routing security while maintaining high reliability and observability. Requires proven experience in production datacenter/ISP networking, strong BGP knowledge, and fluent English.
Key Highlights
Key Responsibilities
Technical Skills Required
Benefits & Perks
Nice to Have
Job Description
What we do
Circle B builds sustainable IT infrastructure for the AI and cloud era. For over a decade— we have designed and deployed datacenter, edge, and AI/HPC systems on Open Compute Project (OCP) hardware. We are independent, vendor-neutral, and ISO 9001 / 14001 / 27001 certified, with deployments across multiple countries.
Our newest initiative is a sovereign EU GPU cloud — operating under full Dutch/EU jurisdiction and beyond the reach of the US CLOUD Act, for regulated European organizations that cannot compromise on where their data lives.
The Role
Network Engineer — BGP / Juniper / EVPN-VXLAN / GPU Cluster Networking
The opportunity
We run our own hosting infrastructure and production network, and we’re looking for a hands-on Network Engineer who enjoys real ownership: operating core connectivity, improving reliability, and building out capabilities that directly matter to customers.
You’ll work on an environment with real routing (own ASN), real datacenter networking, and meaningful change-impact. If you like being close to the technology and seeing your work show up in production immediately, you’ll fit well.
What you’ll do
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
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Build and mature capabilities
- 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 as the source of truth for network inventory and IP addressing
- Improve monitoring/alerting and visibility (telemetry/logging/traffic insight) using the existing toolchain and extending it where needed
- Create and maintain diagrams, runbooks, and change documentation so the environment becomes easier to run over time
Be helpful beyond networking when needed
- When network workload is lighter, support adjacent infrastructure areas (Linux, virtualization, storage, automation, or occasional customer escalations) depending on your strengths and team priorities
What we’re looking for
Core requirements
- Proven experience operating production networks in a hosting/datacenter/ISP-like environment
- Strong practical knowledge of:
- BGP (policy, filtering, communities, troubleshooting)
- Datacenter switching and L2/L3 fundamentals
- IPv4/IPv6 operations and addressing design
- Comfortable owning production changes: planning, validation, rollback thinking, and post-change checks
- Fluent English (spoken and written)
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Big plus
- 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 environments with low structure (you bring structure without bureaucracy)
- Experience with GPU cluster networking; RDMA/RoCE in production
The working style that succeeds here
- You stay effective when priorities shift and interruptions happen
- You communicate clearly during incidents and changes
- You take ownership and enjoy making systems more reliable, more visible, and better documented over time
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Working model
This is an on-site role in Hoofddorp, 5 days per week, to stay close to the hardware, platform engineering, and execution environment.
Benefits
- Competitive salary.
- Pension scheme.
- Visa sponsorship.
- Company gym.
- Modern office in Hoofddorp.
- Informal and open working culture.
- Participation in relevant conferences and exhibitions across Europe.
- Opportunity to develop your skills in a fast-growing technology environment.
Our Work Culture
Circle B offers an informal working atmosphere with energetic people who enjoy being part of a growing technology company. We have an open management culture and encourage colleagues to contribute to improving our products, services, and processes.
If this sounds like a good fit, please send your CV and motivation letter to:
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