Comprehensive knowledge of game engine structure and runtime behavior, covering the game loop and frame execution model, scene and asset management, entity component system design and object composition patterns, lifecycle and update semantics including fixed update versus variable update timing, prefab and instancing systems, scripting system integration and interop, memory management and object pooling strategies, resource loading and streaming, plugin and extension mechanisms, engine source code exploration and customization, profiling and performance optimization across CPU, GPU, and physics, determinism and networking considerations, and best practices for structuring projects for scalability and maintainability. Includes both engine specific details such as Unity lifecycle methods and prefab workflows and general engine architecture concepts applicable to other engines.
HardTechnical
70 practiced
Design a custom in-engine profiler that collects both low-overhead CPU timing events and GPU timestamp queries, correlates events across multiple threads and frames, supports sampling vs instrumentation modes, and uploads summarized traces asynchronously for regression testing. Describe data structures, per-thread ring-buffers, and how to minimize probe overhead in hot code paths.
MediumTechnical
58 practiced
Describe concrete techniques to achieve deterministic physics across different platforms and compilers. Cover fixed timestep enforcement, deterministic RNG, avoiding unordered containers, using platform-independent math (or fixed-point), canonical collision ordering, and testing strategies to detect and reproduce divergences.
MediumSystem Design
59 practiced
Design a prefab instancing system that supports live-editing in the editor, efficient runtime instantiation, and stores overrides separately from base prefabs. Describe the data model for instances (base-reference + override-deltas), how to apply overrides lazily at runtime, and trade-offs between copy-on-write and full cloning for performance and memory.
HardSystem Design
67 practiced
You have engine source access and must add a new rendering feature (for example, tiled volumetric lighting). Outline a plan covering design changes to the render graph, shader integration and fallbacks, asset pipeline changes, editor controls, testing strategy (unit, integration, platform tests), performance validation and optimization passes, and risk/rollback mitigation for enabling the feature per-project.
EasyTechnical
54 practiced
Describe how scripting languages (C#, Lua, Python) are typically integrated into engines written in a native language like C++. Explain binding approaches (embedding interpreter, C API, generated bindings), and common interop pitfalls such as garbage-collection stalls, expensive marshaling, reverse calls, and thread-safety concerns.
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