Learning how to pass a system design interview for a robotics company is fundamentally different from a standard "Web Scale" interview. In robotics, you aren't just moving data between databases; you are integrating physical hardware with real-time software.
Understanding Robotics System Design
In a robotics interview, you must discuss the Perception-Planning-Actuation loop. Your system must process environmental data in milliseconds to ensure the robot doesn't collide with obstacles.
Key Components of a Robotic Stack
- Sensing Layer: LiDAR, Cameras, IMU, and Wheel Encoders.
- Perception Layer: Object detection, SLAM, and state estimation.
- Planning Layer: Global pathfinding (A*) and local trajectory generation.
- Control/Actuation: PID controllers or Model Predictive Control (MPC).
Critical Constraints: Latency and Safety
| Metric | Target Range | Importance |
|---|---|---|
| Control Loop Latency | 1ms - 10ms | Stability |
| Perception Delay | < 100ms | Obstacle Avoidance |
| Bandwidth (LiDAR) | 100-700 Mbps | Data Throughput |
Robotics Interview Preparation Checklist
- Explain Zero-Copy data transfer (like in ROS2).
- Discuss Fail-Safe modes.
- Address Communication protocols (DDS, Protobuf).
- Mention Simulation (Gazebo or NVIDIA Isaac Sim).
Frequently Asked Questions
What is the most common question? +
Design the software architecture for an autonomous robot. Draw block diagrams from sensors to actuators.
Do I need to know ROS? +
Yes, especially ROS2 and DDS for reliability in real-time systems.