Mechanical Behavior & Hardware Testing
This evaluation area focuses on your ability to ensure that the physical components of the Zip and its ground infrastructure can withstand the physical demands of daily operations.
You will be evaluated on your understanding of materials, structural mechanics, and environmental testing. The interviewers want to see that you can apply textbook formulas to real-world hardware challenges.
Be ready to go over:
- Statics and Dynamics – Calculating forces, moments, and stresses on structural components.
- Vibration and Fatigue – Understanding how continuous flight vibration affects electronics and carbon fiber structures, and how to test for fatigue life.
- Fasteners and Joints – The physics of bolted joints, torque specifications, and preventing mechanical loosening.
- Advanced concepts (less common) – Thermal expansion mismatch in multi-material assemblies, and aerodynamic drag impacts on structural loading.
Example questions or scenarios:
- "Sketch a beam supported at both ends with an offset point load, and draw its shear force and bending moment diagrams on paper."
- "How would you design an accelerated lifetime test for a new wing hinge mechanism to simulate five years of field operations?"
- "Explain the difference between yield strength and ultimate tensile strength, and why this distinction matters when selecting materials for flight hardware."
Flight Operations & Autonomy Testing
For roles focused on flight and ground operations, this area assesses your capability to safely execute, monitor, and analyze test flights of autonomous systems.
Interviewers will look for your familiarity with flight testing methodologies, data logging, and how you handle anomalous behavior in autonomous systems.
Be ready to go over:
- Telemetry Analysis – Reading and interpreting flight logs, sensor data, and system state transitions.
- Test Planning – Writing clear, repeatable, and safe flight test cards to validate new software or hardware features.
- Autonomy Failure Modes – Understanding how GPS loss, wind shear, or sensor degradation affects autonomous flight paths.
- Advanced concepts (less common) – Hardware-in-the-loop (HIL) simulation setups and automated regression testing for flight control software.
Example questions or scenarios:
- "During a test flight, the aircraft unexpectedly deviates from its planned path. Walk me through your immediate actions and your subsequent troubleshooting steps."
- "How would you structure a test plan to validate the collision avoidance system of an autonomous drone in low-visibility conditions?"
- "Describe how you would test the transition phase of a vertical take-off and landing (VTOL) aircraft from vertical lift to forward flight."
Root Cause Analysis & Technical Incident Investigation
This area measures your structured problem-solving skills when dealing with complex, multi-disciplinary failures where the cause is not immediately obvious.
You must demonstrate a methodical approach to troubleshooting, showing how you separate symptoms from actual root causes in cyber-physical systems.
Be ready to go over:
- Diagnostic Frameworks – Using structured methods (like 5 Whys or Fishbone diagrams) to trace a failure back to its source.
- Cross-Disciplinary Troubleshooting – Isolating issues that could be caused by software bugs, electrical noise, or mechanical wear.
- Preventive Action Formulation – Translating a failure analysis into concrete design or process changes to prevent recurrence.
Example questions or scenarios:
- "Tell me about a technical incident you investigated in a past role. What was the initial symptom, how did you isolate the cause, and what was the permanent fix?"
- "A temperature sensor on a battery pack is reporting intermittent spikes during high-speed flight maneuvers. How do you determine if this is a thermal issue, an electrical noise issue, or a loose connector?"
