Roblox
Senior
Build the real-time messaging infrastructure that connects tens of millions of Roblox users
Roblox is hiring a Senior Software Engineer (5+ years) for its Communications Platform team in San Mateo, CA, owning the systems behind chat, direct messaging, forums, comments, real-time socket messaging, streaming, and search at global scale. The role is end-to-end ownership: design docs through production operation, API/client library design for internal and creator-facing use, and safety as a first-class design constraint.
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Free · a live voice mock calibrated to this exact role
What this interview tests
- Real-time messaging/socket infrastructure at scale
- API and client library design for internal + external (creator) consumers
- End-to-end project ownership from design doc to production
- Safety-by-design in communication systems
- Production reliability, on-call, performance improvement
- Server-side language depth (C#, Java, Go, or C++)
Common question themes
Design a real-time chat/messaging system for tens of millions of concurrent users
Walk through an API or client library you designed for other teams to consume
Tell me about leading a technical initiative end-to-end, including a design doc you authored
How would you build safety constraints into a communications feature from the start
Describe a production reliability issue you owned and the fix that stuck
How do you make architectural decisions that hold up under scale growth
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