Senior C++ Concurrency Engineer, Game Engine Runtime

Roblox; Canada (KY); On-site; USD 197,000 - 243,000; Full time

Job summary

Roblox is seeking a Systems Runtime engineer for the Game Engine team to own the Concurrency system, scheduler, and fiber runtime. You will research performance improvements to unlock platform initiatives and serve as a go-to expert for concurrency concerns across engineering teams.

You will debug production issues on PC, Mac, mobile, and console, and design robust primitives to boost productivity for hundreds of engineers and millions of players worldwide.

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, memory models.
• 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 – 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++17+

Multithreading

Profiling

Job description

Roblox is seeking a Systems Runtime engineer for the Game Engine team to own the Concurrency system, scheduler, and fiber runtime. You will research performance improvements to unlock platform initiatives and serve as a go-to expert for concurrency concerns across engineering teams.

You will debug production issues on PC, Mac, mobile, and console, and design robust primitives to boost productivity for hundreds of engineers and millions of players worldwide.