Senior Network Engineer II

Coreweave; Warszawa; On-site; PLN 180,000 - 280,000; Full time

Benefits offered by this job

Living Wage

Job summary

CoreWeave is seeking a Senior Network Engineer to join our Data Center Network Engineering Team in Warszawa. You will deploy, scale, and operate large-scale data center network infrastructure to support production workloads and rapid growth.

You will design multi-tier fabrics (Clos/spine-leaf), automate deployments, validate readiness, and collaborate with data center technicians and internal teams to optimize network performance and reliability.

Qualifications

• Proven experience designing and operating large-scale data center networks.
• Strong knowledge of BGP, routing policies and ECMP.
• Experience with fabric architectures (Clos/spine-leaf) and automation.

Responsibilities

• Adapt to a rapidly changing environment and learn new networking technologies.
• Design and deploy large-scale networks rapidly, leveraging automation.
• Plan, deploy, operate, and scale multi-tier data center fabrics across data centers.
• Drive end-to-end deployments: rack layout, cabling, optics, configuration, testing.
• Work with data center technicians to execute builds (rack, cable, power, optics).
• Validate network readiness before handing off to production traffic.
• Troubleshoot control plane (BGP), data plane (ECMP), and physical layer issues.
• Participate in reviews, design discussions, and deploy-runbooks documentation.

Skills

BGP

ECMP

Data center nets

Automation

Clos/spine-leaf

Rack design

Troubleshooting

Job description

CoreWeave is The Essential Cloud for AI™. Built for pioneers by pioneers, CoreWeave delivers a platform of technology, tools, and teams that enables innovators to build and scale AI with confidence. Trusted by leading AI labs, startups, and global enterprises, CoreWeave combines superior infrastructure performance with deep technical expertise to accelerate breakthroughs and turn compute into capability. Founded in 2017, CoreWeave became a publicly traded company (Nasdaq: CRWV) in March 2025. Learn more at www.coreweave.com.

We’re proud to be a Living Wage accredited Employer.

What You’ll Do:

CoreWeave is looking for an experienced Senior Network Engineer to join our rapidly growing Data Center Network Engineering Team. This role is focused on deploying, scaling, and operating large-scale data center network infrastructure. The team is responsible for bringing new network capacity online across data centers and ensuring the network is stable, reliable, and ready to support production workloads.

About the role:

• Quickly adapt to a rapidly changing environment and learn new emerging networking technologies
• Design and deploy consistent large scale networks rapidly, leveraging automation
• Plan, deploy, operate, and scale multi-tier data center network fabrics (Clos / spine-leaf) across multiple data centers
• Drive end-to-end network deployments, including:
  • Rack layout planning
  • Cabling and optics validation
  • Configuration generation and deployment
  • Post-deployment validation and testing
• Work closely with data center technicians (DCTs) to execute builds (rack, cable, power, optics)
• Validate network readiness before handing off to production traffic
• Troubleshoot complex issues across:
  • Control plane (BGP, routing policies)
  • Data plane (ECMP, packet loss, latency)
  • Physical layer (interfaces, optics, cabling)
• Perform network changes and deployments with a strong focus on:
  • Blast radius awareness
  • Rollback planning
  • Operational safety
• Participate in peer reviews, design discussions, and architectural decisions
• Contribute to documentation, runbooks, and deployment procedures
• Partner with internal teams (automation, DC ops, engineering) to improve deployment workflows
• Share your knowledge and guide junior team members, fostering a