Senior Concurrency Systems Engineer (C++ Runtime)

Roblox Corporation; San Mateo (CA); On-site; USD 197,000 - 243,000; Full time

Job summary

Roblox Corporation's Game Engine team is seeking a Systems Runtime engineer to own the Concurrency system—task scheduler, fiber runtime, and async APIs—across the Roblox client, editor, and simulation servers.

You will tackle 3K-player server workloads, optimize performance, and collaborate with other engine teams to keep the platform fast and scalable for millions of players worldwide.

Qualifications

• Strong modern C++ (C++17 or newer) in a large production codebase.
• Deep multithreading/concurrency experience — schedulers, thread pools, lock-free programming, atomics.
• Comfort profiling and reasoning about OS/CPU level performance.

Responsibilities

• Own the engine's Concurrency system — the task scheduler, fiber runtime, and async APIs that every other engine team builds on.
• Research and implement performance improvements that unblock platform initiatives – unlocking higher fidelity and richer experiences.
• Serve as a point of contact for concurrency across the org: design reviews, hard parallelism bugs, and asks from other engine teams.
• Improve the ergonomics, testability, and debuggability of concurrent code across PC, Mac, mobile, and console.

Skills

C++ proficiency

Multithreading / Concurrency

Performance profiling

Job description

Roblox Corporation's Game Engine team is seeking a Systems Runtime engineer to own the Concurrency system—task scheduler, fiber runtime, and async APIs—across the Roblox client, editor, and simulation servers.

You will tackle 3K-player server workloads, optimize performance, and collaborate with other engine teams to keep the platform fast and scalable for millions of players worldwide.