Roblox
Mid
Build the real-time network transport layer that keeps millions of Roblox players synchronized
This interview covers systems-level C++ and network stack engineering for Roblox's Engine Networking team, which synchronizes game state across a massive multithreaded distributed system spanning desktop, mobile, and console clients. Expect deep questions on latency/throughput tradeoffs, memory and pointer mechanics, and Linux networking protocols.
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What this interview tests
- User-space network stack design (scale, performance, latency, throughput)
- Systems-level C++ internals (smart pointers, templates, virtual functions, memory layout)
- Large-scale multithreaded distributed systems for millions of concurrent users
- Cross-platform client networking (desktop, mobile, console)
- Linux networking and common network protocols
- Game engine architecture fundamentals
Common question themes
How would you reduce latency in a client/server network exchange, step by step
Explain what happens at the OS/CPU level when a piece of C++ code using smart pointers or virtual functions executes
Describe a time you debugged a throughput or latency issue in a distributed multithreaded system
How do you design a network stack that behaves consistently across desktop, mobile, and console clients
Walk through your understanding of a common network protocol's tradeoffs
Tell me about your experience within a game engine or game studio network system
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