Principal C++ App Performance Engineer — Multi‑Platform

Roblox; San Mateo (CA); On-site; USD 295,250 - 345,040; Full time

Benefits offered by this job

Equity compensation

Benefits package

Job summary

Roblox is seeking a Principal Software Engineer to improve client performance across mobile, desktop and console. You will work in cross-platform C++ code, profiling real-world performance, and shipping measurable improvements while preventing regressions.

Responsibilities include roadmaps for efficiency, experiments, CI/CD automation, and collaboration with stakeholders to ensure performance enhancements support the user experience.

Qualifications

• 10+ years of experience in C++ with high-performance code in large codebases.
• Ability to dive into unfamiliar codebases and deliver production-grade results.
• Experience improving performance on mobile platforms (iOS/Android).
• Ability to build reliable systems with monitoring and regression prevention.

Responsibilities

• Conduct research, create and drive roadmaps to improve Roblox on target platforms.
• Design novel solutions to optimize performance and computing resources of Roblox client app.
• Profile and diagnose real-world performance on iOS or Android to identify bottlenecks and validate wins.
• Build and productionize repeatable benchmarks/experiments, CI/CD automation to catch regressions early, dashboards/alerts with actionable signals.
• Collaborate with Engineering, Product, and Design to align priorities and rollout plans.

Skills

10+ years of experience in C++

Ambiguity tolerance

Mobile performance

Systems thinking

Job description

Roblox is seeking a Principal Software Engineer to improve client performance across mobile, desktop and console. You will work in cross-platform C++ code, profiling real-world performance, and shipping measurable improvements while preventing regressions.

Responsibilities include roadmaps for efficiency, experiments, CI/CD automation, and collaboration with stakeholders to ensure performance enhancements support the user experience.