Principal Software Engineer (App Performance)
Posted Updated
Description
- The Consumer App Performance team is looking for a Principal Software Engineer to spearhead stability and performance improvements
- You will work across system-level, cross-platform C++ game engine, and front-end codebase, partnering with teams across the company to identify bad behavior patterns and performance bottlenecks, ship measurable improvements, and prevent regressions over time
- Our team owns the end-to-end performance of Roblox, from speed and responsiveness to efficiency and stability, across all devices and platforms we support: mobile, desktop, and console
- Drive research of new opportunities, 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
- Systems thinking: ability to build systems that work and keep on working reliably (measurement, monitoring, regression prevention)
- Comfort with ambiguity: able to dive into unfamiliar codebases, unblock yourself, and take projects from greenfield/MVP → production-grade
- 10+ years of experience: working with complex client application codebases, proficiency in C++, knowledge of Lua or other scripting languages is a plus
- 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