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# Principal Software Engineer, App Performance

- **Company:** Roblox
- **Location:** San Mateo, CA, United States
- **Experience:** Expert
- **Salary:** $295,250.0 - $345,040.0
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), C++ (Programming Language), Continuous Integration, Game Engine, Lua (Scripting Language), Scripting, Production Code, Build Tools, Codebase, Roblox
- **Published:** October 4, 2026
- **Apply:** https://careers.roblox.com/jobs/8233354?gh_jid=8233354

## About the Role

* 10+ years of experience: working with complex client application codebases, proficiency in C++, knowledge of Lua or other scripting languages is a plus.
 * Comfort with ambiguity: able to dive into unfamiliar codebases, unblock yourself, and take projects from greenfield/MVP * 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).

## 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.

You will:

 * 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.