Senior Software Engineer - Network Transport

Roblox operates a platform that hosts user‑generated 3D immersive experiences, allowing millions of players to create, play and socialize across desktop, mobile and console devices. The Senior Software Engineer – Network Transport role focuses on the low‑level networking layer that synchronizes game state between clients and servers. Day‑to‑day work involves designing and optimizing a high‑performance user‑space network stack, addressing latency, throughput and scalability challenges in a multithreaded, distributed environment that serves a global audience. The engineer will write and maintain C++ code, profile CPU usage, tune Linux networking parameters, and apply QoS and congestion‑control algorithms to ensure near‑real‑time communication for all supported platforms. Collaboration with engine teams is required to understand how network data integrates with the game loop and to propagate improvements across the stack. The position suits candidates with seven or more years of experience in game or engine networking, deep systems‑level C++ expertise, and a strong grasp of Linux networking, packet scheduling, and OS‑level behavior. A passion for squeezing out every millisecond and a track record of working on large‑scale client/server systems are essential.