Network Engineer

RZR Global Inc.; Poland; On-site; PLN 50,000 - 70,000; Full time

Job summary

RZR Global Inc. is seeking a skilled Network Engineer to join our team in Poland. In this high-ownership role, you will design and manage our network infrastructure, working with cutting-edge technologies including Mellanox Spectrum and Cumulus Linux. Your contribution will shape the performance of our programmatic advertising platform, processing billions of requests daily.

The ideal candidate will have at least 3 years of experience in network engineering, along with a solid understanding of key networking protocols like BGP and OSPF. Join us and be part of a rapidly scaling company ready to make a mark in the industry.

Qualifications

• 3+ years of professional network engineering experience.
• Deep familiarity with Mellanox switches and adapters.
• Strong proficiency in Cumulus Linux and general Linux system administration.

Responsibilities

• Design, deploy, and maintain high-density data center networks.
• Administer and optimize network nodes running Cumulus Linux.
• Manage and orchestrate network operations using Netris.

Skills

Network Engineering Experience

Mellanox Spectrum Familiarity

Cumulus Linux Proficiency

Netris Experience

BGP Knowledge

Python/Go Proficiency

Education

Bachelor's or Master's degree in Computer Science or Engineering

Job description

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.