Senior Network Engineer - Data Center Networking San Mateo, CA, United States Engineering

Every day, tens of millions of people come to Roblox to explore, create, play, learn, and connect with friends in 3D immersive digital experiences– all created by our global community of developers and creators.

At Roblox, we’re building the tools and platform that empower our community to bring any experience that they can imagine to life. Our vision is to reimagine the way people come together, from anywhere in the world, and on any device. We’re on a mission to connect a billion people with optimism and civility, and looking for amazing talent to help us get there.

A career at Roblox means you’ll be working to shape the future of human interaction, solving unique technical challenges at scale, and helping to create safer, more civil shared experiences for everyone.

The Data Center Network Engineering (DNE) is a pod within the Physical Networking team and owns the design, deployment, and operation of Roblox's large-scale data center network. This includes server-layer connectivity, intra and inter-DC connectivity. The team is building High-Performance Networking (HPN) fabrics, deploying 400G/800G networking, and scaling GPU clusters to support AI training and inference.

You will:

• Drive the design, deployment, and operations of Roblox's large-scale data center network, including the networking for GPU clusters that support training and inference workloads.
• Design, qualify, and validate new technologies and hardware for scalable solutions.
• Coordinate data center builds and projects with multiple teams, including weekly cross-team calls.
• Work with Network Reliability Systems, Data Center Ops, Capacity Planning, Supply Chain, and Compute/ML teams to address network challenges early.
• Contribute to automation and telemetry that improve efficiency, reliability, and visibility.

You have:

• 6+ years of expertise designing and deploying large-scale data center fabrics (CLOS).
• Experience with GPU clusters or AI/ML networking.
• Proficiency deploying and managing 400G and 800G hardware.
• Skilled in configuring and troubleshooting large-scale BGP deployments.
• Strong knowledge of network protocols (TCP/IP, UDP, DHCP, DNS), with hands‑on experience in IPv4 and IPv6.
• Preferred: QoS, IS-IS, MPLS, RSVP-TE, DWDM, commercial NAT, open-source hardware and software.

Annual Salary Range

$243,290 — $295,250 USD

Roles that are based in an office are onsite Tuesday, Wednesday, and Thursday, with optional presence on Monday and Friday (unless otherwise noted).

Roblox provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws. Roblox also provides reasonable accommodations to candidates with qualifying disabilities or religious beliefs during the recruiting process.

For US based roles only, please note the Company may not be able to employ candidates for this role who have United States work authorization related to certain U.S. visa categories, or support future H-1B sponsorship at this time.