Principal Software Engineer, App Performance

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

Salary: $295,250–$345,040 USD per year.

Company

Roblox builds a platform and tools for creating and experiencing 3D digital experiences across mobile, desktop, and console devices.

What you will do

• Lead research and roadmaps focused on stability, resilience, responsiveness, and efficiency across supported platforms.
• Design solutions that prevent and mitigate crashes, hangs, and other interruptions to the user experience.
• Build real-time monitoring, alerting, and CI/CD automation for early detection of stability anomalies.
• Develop scalable performance improvements and guardrails for mobile, desktop, and console environments.
• Partner with Engineering, Product, and Design stakeholders on priorities, tradeoffs, and rollout plans.

Requirements

• 10+ years of experience working with complex client application codebases.
• Strong proficiency in C++.
• Hands-on experience with performance profiling and issue triage on mobile or desktop platforms.
• Deep understanding of platform APIs and best practices for performant, robust client code.
• Ability to work through ambiguity, learn unfamiliar codebases, and take projects from MVP to production.
• Experience building reliable systems for measurement, monitoring, and regression prevention.

Nice to have

• Knowledge of Lua or another scripting language.

Culture & Benefits

• Full-time employees are eligible for equity compensation.
• Benefits are available to full-time employees.
• Equal employment opportunities and reasonable accommodations are provided during the recruiting process.
• For US-based roles, certain US visa categories may not be supported, and future H-1B sponsorship may not be available.