Responsibilities

• Quickly adapt to a rapidly changing environment and learn new emerging networking technologies
• Design and deploy consistent large scale networks rapidly, leveraging automation
• Participate in peer reviews, design discussions, and architectural decisions
• Troubleshoot complex problems and support internal and external customers
• Share your knowledge and guide junior team members, fostering a culture of continuous learning and improvement
• Effectively collaborate across teams and areas of expertise

Requirements

• 7+ years of experience as a Network Engineer
• Experience managing Hyperscale Clos fabrics
• Networking OS Experience - Cumulus Linux, Sonic, Arista EOS, Junos, Cisco NX-OS
• Expertise with major routing protocols (BGP, ISIS, OSPF)
• Experience with encapsulation protocols (EVPN/VXLAN or Geneve)
• Experience automating configuration management (Ansible, SaltStack, home grown)
• Familiarity with scripting/programming (Shell, Python)
• Operational experience with Git
• Large scale network design, maintenance, and operations
• Experience leading complex projects as part of a team
• Deep understanding of TCP/IP
• Strong Linux skills

Nice-to-Haves

• College education in Computer Science, Electrical Engineering
• Certifications like CCNA, CCNP, JNCIA
• Experience with Kubernetes and CNIs (Calico, Cilium)

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The Network Services team builds and operates the foundational networking that powers CoreWeave's Kubernetes platforms at cloud scale. The team is responsible for container networking, connectivity, and network services that support large-scale, GPU-driven workloads across regions and environments. They focus on scalability, reliability, security, and performance while delivering intuitive platforms for internal teams and customers.

About the Role

As a Senior Engineer focused on our Cilium-based CNI, you will design, build, and operate the container networking layer that underpins CoreWeave's Kubernetes platforms. Day to day, you will work on evolving our CNI stack to support large, high-density GPU clusters with demanding throughput and latency requirements. You will partner closely with Kubernetes, Infrastructure, and Network Services engineers to ensure the platform is highly available, observable, and secure. This role spans architecture, implementation, and operations, with ownership from prototype through production. You will also help shape how our networking platform scales for future growth.

Who You Are

• 5+ years of experience as a Software Engineer or Systems Engineer working on cloud infrastructure or large-scale distributed systems.
• Hands-on production experience with Cilium CNI (or equivalent advanced CNIs), including cluster configuration and lifecycle management.
• Strong understanding of Cilium's eBPF datapath, policy model, and load-balancing mechanisms.
• Deep knowledge of cloud networking concepts, including VPCs, subnets, routing, security groups/ACLs, NAT, and ingress/egress architectures.
• Experience designing multi-tenant network architectures with strong isolation and security.
• Solid grounding in TCP/IP, dynamic routing (e.g., BGP), ECMP, MTU/fragmentation, and overlay/underlay networking (VXLAN, Geneve, encapsulation).
• Experience with network observability and troubleshooting across L3–L7.
• Proficiency in at least one systems language such as Golang or C/C++.
• Experience working in modern CI/CD environments.
• Experience operating Kubernetes at scale, including cluster lifecycle management and debugging networking issues across pods, nodes, and external services.
• Demonstrated ownership of complex systems end-to-end.

Preferred

• Experience operating cloud-scale network services across tens of thousands of nodes and multiple regions.
• Contributions to Cilium, Kubernetes, or related open-source networking projects.
• Experience with eBPF development and performance tuning.
• Experience building Kubernetes operators or controllers.
• Familiarity with service meshes, multi-cluster networking, or cluster mesh solutions.
• Experience in GPU-heavy, HPC, or other performance-sensitive environments.

Wondering if you’re a good fit?

We believe in investing in our people and value candidates who bring diverse experiences , even if you’re not a 100% match on paper. If some of this sounds like you, we’d love to talk.

• You love solving complex distributed systems and networking challenges at scale.
• You’re curious about cloud-native networking, eBPF, and Kubernetes internals.
• You’re an expert in building reliable, scalable infrastructure that runs in production.

Why CoreWeave?

At CoreWeave, we work hard, have fun, and move fast! We’re in an exciting stage of hyper-growth that you will not want to miss out on. We’re not afraid of a little chaos, and we’re constantly learning. Our team cares deeply about how we build our product and how we work together, which is represented through our core values:

• Be Curious at Your Core
• Act Like an Owner
• Empower Employees
• Deliver Best-in-Class Client Experiences
• Achieve More Together

The base salary range for this role is $165,000 to $242,000. The starting salary will be determined based on job-related knowledge, skills, experience, and market location. We strive for both market alignment and internal equity when determining compensation. In addition to base salary, our total rewards package includes a discretionary bonus, equity awards, and a comprehensive benefits program (all based on eligibility).

What We Offer

The range we’ve posted represents the typical compensation range for this role. To determine actual compensation, we review the market rate for each candidate which can include a variety of factors. These include qualifications, experience, interview performance, and location. In addition to a competitive salary, we offer a variety of benefits to support your needs, including:

• Medical, dental, and vision insurance
• 100% paid for by CoreWeave
• Company-paid Life Insurance
• Voluntary supplemental life insurance
• Short and long-term disability insurance
• Flexible Spending Account
• Health Savings Account
• Tuition Reimbursement
• Ability to Participate in Employee Stock Purchase Program (ESPP)
• Mental Wellness Benefits through Spring Health
• Family-Forming support provided by Carrot
• Paid Parental Leave
• Flexible, full-service childcare support with Kinside
• 401(k) with a generous employer match
• Flexible PTO
• Catered lunch each day in our office and data center locations
• A casual work environment
• A work culture focused on innovative disruption

Our Workplace

While we prioritize a hybrid work environment, remote work may be considered for candidates located more than 30 miles from an office, based on role requirements for specialized skill sets. New hires will be invited to attend onboarding at one of our hubs within their first month. Teams also gather quarterly to support collaboration.

California Consumer Privacy Act - California applicants only

CoreWeave is an equal opportunity employer, committed to fostering an inclusive and supportive workplace. All qualified applicants and candidates will receive consideration for employment without regard to race, color, religion, sex, disability, age, sexual orientation, gender identity, national origin, veteran status, or genetic information. As part of this commitment and consistent with the Americans with Disabilities Act (ADA), CoreWeave will ensure that qualified applicants and candidates with disabilities are provided reasonable accommodations for the hiring process, unless such accommodation would cause an undue hardship. If reasonable accommodation is needed, please contact: careers@coreweave.com.

Export Control Compliance

This position requires access to export controlled information. To conform to U.S. Government export regulations applicable to that information, applicant must either be (A) a U.S. person, defined as a (i) U.S. citizen or national, (ii) U.S. lawful permanent resident (green card holder), (iii) refugee under 8 U.S.C. § 1157, or (iv) asylee under 8 U.S.C. § 1158, (B) eligible to access the export controlled information without a required export authorization, or (C) eligible and reasonably likely to obtain the required export authorization from the applicable U.S. government agency. CoreWeave may, for legitimate business reasons, decline to pursue any export licensing process.

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Your mission is to solve complex security problems through software engineering, focusing on three core pillars:

• Identity & Network Security: Engineering high-performance IAM controls and zero-trust network architectures.
• Unified Vulnerability Orchestration: Architecting a custom 'single pane of glass' for security data.
• Compliance as Code: Building the automated systems that provide real-time evidence for frameworks like SOC 2, ISO 27001 & PCI.

You will be a key member of our growing Security Engineering team, working at the intersection of Infrastructure, Cross-Cutting, and GRC. We operate like a specialized product team: we identify security friction and build the software to eliminate it.

You will lead the design and maintenance of our internal security tool suite, written primarily in Go, to automate evidence collection and real-time remediation of security alerts. You will also write and peer-review Terraform and custom providers to manage identity and core infrastructure across AWS and GCP.

The team supports the use of Go, Terraform, Kubernetes, and Cilium. Experience with eBPF, Sigstore/Cosign, image provenance, and SBOMs is desirable.

Engine by Starling offers a range of benefits, including 33 days holiday, an extra day's holiday for your birthday, annual leave increased with length of service, and a company-enhanced pension scheme.

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About Engineering at Engine by Starling

At Engine by Starling, we don't do 'checkbox security',we build security software. We treat security as a first-class engineering discipline, where the solution to a threat isn't a policy, but a robust, concurrent system written in Go.

As a Cloud Security Software Engineer, you will be a hands-on builder responsible for the security architecture of our multi-tenant core banking platform. You'll spend your days architecting and writing Go-based tooling, automating defenses, and ensuring our infrastructure across AWS and GCP is secure by design and compliant by default.

The Mission

Your mission is to solve complex security problems through software engineering, focusing on three core pillars:

• Identity & Network Security: Engineering high-performance IAM controls and zero-trust network architectures. You will lead the way in refining edge-defense strategies and trust redirection, ensuring every request is verified and encrypted at scale.
• Unified Vulnerability Orchestration: Architecting a custom 'single pane of glass' for security data. You will build Go-based API integrations and microservices that bridge scanning engines, dependency trackers, and internal portals into a seamless, automated ecosystem.
• Compliance as Code: Building the automated systems that provide real-time evidence for frameworks like SOC 2, ISO 27001 & PCI. You’ll ensure we stay compliant through continuous, automated validation rather than manual overhead.

The Team

You will be a key member of our growing Security Engineering team, working at the intersection of Infrastructure, Cross-Cutting, and GRC. We operate like a specialized product team: we identify security friction and build the software to eliminate it. You won’t work in a silo; you’ll collaborate with engineers across the business to deliver a platform that is resilient by default.

About You

We are looking for Software Engineers who are passionate about the Go ecosystem and want to apply those skills to mission-critical security challenges. Whether you come from a Security Engineering background or you are a Backend Engineer with a 'security-first' mindset, we value your ability to write clean, maintainable, and efficient code.

What you’ll get to do

• Engineering Security Tooling: Lead the design and maintenance of our internal security tool suite, written primarily in Go, to automate evidence collection and real-time remediation of security alerts.
• Infrastructure as Code: Write and peer-review Terraform and custom providers to manage identity and core infrastructure across AWS and GCP.
• Supply Chain Security: Build automated systems to manage container provenance and integrate security analysis into our CI/CD pipelines (GitHub Actions/TeamCity).
• Cloud Native Defense: Engineer Kubernetes security solutions leveraging Cilium, eBPF, and custom controllers to protect our microservices.
• Cryptographic Engineering (PKI): Build and maintain our Go-based Certificate Authority (CA) tooling and internal PKI infrastructure.
• Incident Response: Support the team in automated incident response, building the tools that help us investigate and mitigate threats faster.

Requirements

What skills are essential:

• Go Specialist: You are proficient in Go. You understand its concurrency models, testing patterns, and how to build idiomatic, performant services.
• The Builder Mindset: You find manual work a personal affront. If a task needs to be done twice, you’ve already started planning the automation for it.
• Cloud Native: Practical experience with AWS or GCP, ideally managed through Terraform.
• Container Expertise: You understand Kubernetes internals,from the runtime security to the service mesh.
• Identity & Networking: Strong understanding of cloud identity models and network protocols.

What skills are desirable:

• Experience with Cilium or eBPF-based security monitoring.
• Knowledge of Sigstore/Cosign, image provenance, and SBOMs.
• Familiarity with hardware security modules (HSMs) or advanced cryptography.
• Cloud-native security certifications (AWS/GCP).

Benefits

• 33 days holiday (including public holidays, which you can take when it works best for you)
• An extra day’s holiday for your birthday
• Annual leave is increased with length of service, and you can choose to buy or sell up to five extra days off
• 16 hours paid volunteering time a year
• Salary sacrifice, company enhanced pension scheme
• Life insurance at 4x your salary & group income protection
• Private Medical Insurance with VitalityHealth including mental health support and cancer care. Partner benefits include discounts with Waitrose, Mr&Mrs Smith and Peloton
• Generous family-friendly policies
• Incentives refer a friend scheme
• Perkbox membership giving access to retail discounts, a wellness platform for physical and mental health, and weekly free and boosted perks
• Access to initiatives like Cycle to Work, Salary Sacrificed Gym partnerships and Electric Vehicle (EV) leasing

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