Own end-to-end client performance (TTI, app size, battery) across Roblox's C++ engine on every platform

Interview for a Senior Software Engineer role on Roblox's Consumer App Foundation team, owning end-to-end performance of the Roblox client (TTI, app size, battery usage) across Android, iOS, macOS, Windows, and consoles. Expect deep C++ performance-engineering questions, benchmarking/telemetry system design, and cross-functional tradeoff conversations at a platform used by 150M+ daily users.

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What this interview tests

High-performance C++ in large, cross-platform, unfamiliar codebases
Building benchmarking, profiling, and telemetry systems to catch regressions early
Owning concrete performance metrics: TTI, app size, battery usage
Cross-functional tradeoff conversations with Engineering, Product, Design
Autonomously navigating ambiguous, complex systems to production-grade delivery
On-device profiling (iOS/Android) as a plus

Common question themes

Walk through a specific C++ performance bug you diagnosed and fixed, with before/after metrics

How would you design a telemetry/benchmarking system to catch performance regressions pre-release

Describe taking a performance project from greenfield MVP to production at scale

How do you prioritize between competing performance metrics (e.g., startup time vs. battery vs. app size)

Tell me about diving into an unfamiliar large codebase and shipping a production-grade fix

How would you present a technical performance tradeoff to Product/Design stakeholders

How candidates describe it

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