Principal Software Engineer, App Performance

Overview

Principal Software Engineer on the Consumer App Performance team, leading stability and performance improvements across Roblox's system-level, cross-platform C++ game engine and front-end codebase.

What you'll do

• Drive research of new opportunities, and build and execute roadmaps to improve stability and resilience of Roblox across all target platforms.
• Design novel solutions to prevent and mitigate crashes, hangs, and other interruptions that hurt user experience.
• Build robust defense mechanisms for early detection of stability anomalies through real-time monitoring, alerting, and CI/CD automation.
• Work with stakeholders across Engineering, Product, and Design to align on priorities, tradeoffs, and rollout plans; ensure performance improvements support the user experience.
• Deliver improvements and guardrails that scale across mobile, desktop, and console, with informed tradeoffs for mobile constraints.

What you'll need

• 10+ years of experience working with complex client application codebases.
• Proficiency in C++.
• Comfort with ambiguity: able to dive into unfamiliar codebases, unblock yourself, and take projects from greenfield/MVP to production-grade.
• Deep understanding of client platforms: hands-on experience in performance profiling and triaging issues on one or more of mobile or desktop platforms.
• Deep understanding of platform API and best practices to implement performance and robust code.
• Systems thinking: ability to build systems that work and keep on working reliably (measurement, monitoring, regression prevention).

Nice to have

• Knowledge of Lua or other scripting languages.

Details

• Location: San Mateo, CA headquarters.
• Roles based in an office are onsite Tuesday, Wednesday, and Thursday, with optional presence on Monday and Friday (unless otherwise noted).
• Annual base salary range: $295,250 to $345,040 USD.
• Full-time; eligible for equity compensation and benefits.
• For US-based roles only: the Company may not be able to employ candidates who have United States work authorization related to certain U.S. visa categories, or support future H-1B sponsorship at this time.