Roles they hire for
- Device firmware engineer (Echo, Kindle, Ring)
- Low-power connectivity engineer (Sidewalk)
What they emphasise
- Echo, Kindle and Ring devices
- Sidewalk low-power networking
- OTA at fleet scale
Brush up on
Wi-Fi and BLELow-power radiosFleet OTAWake-word pipelinesLinux on devices
How the rounds usually run
A typical consumer hardware loop for embedded roles. Companies vary by team and seniority.
Recruiter screen
- Background, role fit and logistics
Example: Walk me through your current project in two minutes.
Technical phone screen: C coding
- Live C coding: data structures, bit manipulation, memory
- Explaining your code and edge cases out loud
Example: Implement memmove and explain how you handle overlap.
Loop: embedded system design
- Architecture for a device feature end to end
- Power, memory and real-time trade-offs
Example: Design firmware for a wireless earbud's charging case.
Loop: RTOS, concurrency and debugging
- Scheduling, synchronization, priority inversion
- Hardware and software debugging with scopes and schematics
Example: Explain priority inversion and two ways to prevent it.
Hiring manager and behavioural
- Ownership, cross-functional work and judgement
Example: Tell me about a time you shipped under a hard deadline. What did you cut?
Practice questions
Original questions written for Amazon devices (Lab126, Kuiper)'s focus areas, not leaked ones.
- How would you roll out a firmware update to millions of devices safely?
- Design the audio path from microphone to wake-word detector on a low-power DSP.
- A battery doorbell must last six months. Where does the energy go, and how do you budget it?
- How do devices recover if the cloud is down for a day?
- Explain how you'd detect and report device crashes from the field.
Your prep playlist
Design rounds to practise
Themes are inferred from Amazon devices (Lab126, Kuiper)'s public product lines.
Take an AI mock round styled on Amazon devices (Lab126, Kuiper), with follow-ups that probe what you missed.
Start a mock round