Senior Software Engineer, Runtime (C++)

Location: San Mateo, California, United States; office-based roles require onsite presence Tuesday, Wednesday, and Thursday, with optional presence Monday and Friday

Salary: $196,750–$243,290 USD base pay

Company

Roblox builds tools and platform infrastructure for user-created 3D immersive digital experiences across multiple devices.

What you will do

• Own parts of the engine’s Concurrency system, including the task scheduler, fiber runtime, and async APIs.
• Research and implement performance improvements supporting higher-fidelity experiences and 3K-player servers.
• Act as the concurrency point of contact for design reviews, parallelism bugs, and requests from other engine teams.
• Improve the ergonomics, testability, and debuggability of concurrent code across PC, Mac, mobile, and console.
• Debug production failures and develop a deep understanding of compiler, CPU architecture, and operating-system interactions.

Requirements

• Strong modern C++ experience, including C++17 or newer, in a large production codebase.
• Deep multithreading and concurrency experience with schedulers, thread pools, lock-free programming, atomics, and memory models.
• Experience profiling and reasoning about performance at the operating-system and CPU levels.
• Ability to work from the United States and meet the required office attendance schedule.
• Certain U.S. visa categories may not be supported, and future H-1B sponsorship may not be available.

Nice to have

• Game engine or real-time systems experience.
• Experience with fiber or coroutine runtimes, work-stealing, or job-system schedulers.
• Cross-platform low-level development for Android, iOS, or consoles.
• Experience serving as a technical expert consulted by other engineering teams.

Culture & Benefits

• Work on systems supporting tens of millions of player sessions and a global developer community.
• Full-time employees are eligible for equity compensation and company benefits.
• Equal employment opportunities and reasonable accommodations are provided during the recruiting process.