Senior C++ Engineer building Roblox's first-of-its-kind in-engine ads system from the ground floor

Roblox is hiring a Senior Software Engineer to help build a brand-new ads system inside the Roblox Game Engine, starting with video ad formats, for a team that's at the beginning of a multi-billion dollar business. The bar is deep C++ codebase experience (6+ years) combined with strong analytical/data instincts, since the role sits at the intersection of engine performance, ad delivery, and app metrics.

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What this interview tests

Deep C++ engineering in large, complex codebases
Game engine performance and cross-experience scalability
Building new ad formats/integrations from 0 to 1
App metrics, analytics, and data-driven decision making
Production-quality, reliable system design
Cross-functional collaboration on community-respecting ad UX

Common question themes

Describe the hardest bug or performance problem you solved in a large C++ codebase

How would you design a new ad format that must scale across every Roblox experience

Tell me about a time you used metrics/data science to validate a product decision

How do you approach building a production-quality system from scratch

How do you balance ad monetization with user/community experience

What's your process for staying current with emerging engineering technologies

How candidates describe it

Real Senior Software Engineer interview stories — retold from candidates' public write-ups, with sources.

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