The posting
Who Are We?
RZR is an AI-native advertising platform built for the next era of performance marketing. We operate at the intersection of machine learning, programmatic media, and full-funnel mobile growth, powering campaigns for some of the world's most ambitious advertisers. Our platform is purpose-built to deliver outcomes at scale, not just impressions.
We are a team of builders, operators, and technologists who believe the advertising industry is overdue for a fundamental rethink. We move fast, operate with a high degree of ownership, and hold ourselves to an exceptionally high standard of craft.
RZR is scaling aggressively with an active M&A pipeline and a platform vision that puts us on a path to becoming an industry leader. This is a rare opportunity to join a company at an inflection point and help shape what it becomes.
Role Overview
We are looking for a skilled Network Engineer to join our San Francisco engineering hub. In this role, you will own the design, implementation, and day-to-day management of the high-performance network infrastructure that powers our programmatic Demand-Side Platform — a real-time bidding environment where milliseconds matter and reliability is non-negotiable.
You will work hands-on with modern open networking technologies — including Mellanox Spectrum hardware, Cumulus Linux, and Netris — to build and maintain a low-latency, highly automated data center fabric. You will collaborate closely with global infrastructure and backend engineering teams to deliver a network environment that scales with the business.
Key Responsibilities
- Network Infrastructure: Design, deploy, and maintain high-density data center networks utilizing Mellanox switches and adapters.
- Network OS Management: Administer and optimize network nodes running Cumulus Linux, ensuring stable and high-performance routing and switching.
- Software-Defined Networking: Manage and orchestrate network operations using Netris for automated, controller-based networking.
- Performance Optimization: Monitor and tune network performance for real-time systems, with a focus on throughput and latency.
- Security & Compliance: Implement and manage firewall rules, VPNs, and access control lists (ACLs) to protect infrastructure and data assets.
- Automation & Scripting: Develop automation workflows to eliminate manual configuration, improve consistency, and accelerate deployment cycles.
Required Skills and Experience
- 3+ years of professional network engineering experience (6+ years for Senior-level consideration).
- Deep familiarity with Mellanox Spectrum switches and ConnectX adapters.
- Strong proficiency in Cumulus Linux (Debian-based) and general Linux system administration.
- Hands-on experience with Netris for VPC-style networking on-premises or in hybrid cloud environments.
- Expert-level knowledge of BGP, OSPF, EVPN-VXLAN, and LACP.
- Proficiency in Python or Go for network automation.
- Bachelor's or Master's degree in Computer Science, Engineering, or a related technical field.
Why Join RZR ?
- Own the core US data center network infrastructure — this is a high-ownership, high-visibility role, not a support function.
- Work daily with best-in-class open networking hardware and software: Mellanox Spectrum, Cumulus Linux, and Netris in a live production environment.
- Directly shape the backbone of a programmatic platform processing billions of real-time bid requests, where your engineering decisions have immediate, measurable impact.
- Join a small, senior infrastructure team where ideas get implemented — not committee'd to death.
- Be part of a company scaling aggressively, with the scope and trajectory to grow into a broader infrastructure leadership role.
RZR Behaviors
RZR operates by eight core behaviors: Extreme Ownership · Move Fast · Drive for Excellence · Proactive Communication · Courage · Curiosity · Deliver Results · Manage Ambiguity
RZR is an equal opportunity employer
RZR is a place where everyone can grow. However you identify, and whatever background you bring with you, we invite you to apply if this role excites you.
RZR provides equal employment opportunities to all employees and applicants and prohibits discrimination and harassment of any kind. All qualified applicants will receive consideration for employment 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. This policy applies to all terms and conditions of employment, including recruiting, hiring, placement, promotion, termination, layoff, recall, transfer, leaves of absence, compensation, and training.
