Senior Software Engineer, Core Engine (C++)

Location: San Mateo, California, United States. Office-based roles are onsite Tuesday through Thursday, with optional presence on Monday and Friday.

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

Company

Roblox builds a 3D immersive platform and development tools that enable creators and communities to build, play, learn, and connect.

What you will do

• Own components of the engine concurrency system, including the task scheduler, fiber runtime, and asynchronous APIs.
• Research and implement performance improvements supporting higher-fidelity experiences and 3K-player servers.
• Act as the organization-wide point of contact for concurrency design reviews, parallelism issues, and engineering requests.
• Improve the ergonomics, testability, and debuggability of concurrent code across PC, Mac, mobile, and console platforms.
• Debug production failures and develop performance solutions involving compilers, CPU architectures, and operating systems.

Requirements

• Strong modern C++ experience, including C++17 or newer, in a large and complex production codebase.
• Deep experience with multithreading and concurrency, including schedulers, thread pools, lock-free programming, atomics, and memory models.
• Experience profiling and reasoning about performance at the operating-system and CPU level.
• Ability to work from the United States and attend the San Mateo office Tuesday through Thursday.
• Existing United States work authorization is required; certain U.S. visa categories may not be supported.

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 multiple engineering teams.

Culture & Benefits

• Work on engine systems used across Roblox's client, editor, and simulation servers.
• Contribute to safer, more civil shared digital experiences at global scale.
• Full-time employees are eligible for equity compensation and company benefits.
• Equal employment opportunities and reasonable accommodations are provided during the recruiting process.