Principal Software Engineer - Network Transport (45976) San Mateo, CA

San Mateo, CA · San Mateo · USD 295,250-345,040 / year · 10+ years experience · Full-time · Onsite · Posted Sep 28, 2026

At a glance

The Engine Networking Team pulls the players together by ensuring the communication of the game state to all.
As a Principal Network Transport Engineer you will help the players experience the game as a nearly synchronous world.
You will work in all areas of the game platform in your quest for real-time communication of every part of Roblox.

Work on a powerful user-space network stack, solving problems related to scale, performance, latency, and throughput in client/server environments.
Work on a very large multithreaded distributed system that connects millions of users worldwide.
Work on all the devices Roblox supports - from desktop clients to mobile phone clients to console clients.
Work on a game engine and understand how a game engine works.

10+ years of experience with Game networking coming from a Game Engine/Studio
Deep understanding of Network Stack with a passion for working with open source
Strong systems-level C++ programming experience and fascinated by the actual work the CPU does when you use smart pointers, templates, virtual functions, and blocks of memory, both structured and raw
Experience with Linux networking, QoS, Congestion Control Algorithms
Keen to each millisecond of the network exchanges: You know where the time goes and how to reduce the waste
Understanding of what happens on the operating systems level when certain code is completed

Roles that are based in an office are onsite Tuesday, Wednesday, and Thursday, with optional presence on Monday and Friday