Senior Concurrency Engineer - Game Engine Runtime

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

Benefits offered by this job

Equity compensation

Benefits on page

Job summary

Roblox is seeking a Systems Runtime engineer to own the Concurrency system, including the task scheduler and fiber runtime that power the engine. You will research performance improvements for 3K-player servers and collaborate with other engine teams on concurrency challenges.

Role requires strong modern C++, deep multithreading experience, and OS/CPU level performance reasoning. The position is based at Roblox headquarters in San Mateo, CA with equity and benefits described on the page.

Qualifications

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

Responsibilities

• Take ownership of part of 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.
• 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++

Multithreading

Performance profiling

OS/CPU reasoning

Job description

Roblox is seeking a Systems Runtime engineer to own the Concurrency system, including the task scheduler and fiber runtime that power the engine. You will research performance improvements for 3K-player servers and collaborate with other engine teams on concurrency challenges.

Role requires strong modern C++, deep multithreading experience, and OS/CPU level performance reasoning. The position is based at Roblox headquarters in San Mateo, CA with equity and benefits described on the page.