Question bank

Interview questions, with guidance on how to answer

834 questions across 64 roles. Open one to see what a strong answer includes and common slips, then drill it out loud with Ava. New to answer structure? Start with the learning hub.

834 questions.

TechnicalSeniorFull-Stack Engineer
You're asked to deliver a large feature in six weeks with a small team. How would you break it down and decide what ships first?
Tests: End-to-end feature delivery
TechnicalSeniorFull-Stack Engineer
How would you roll out a risky change, like a new checkout flow, so you catch problems before every user sees it?
Tests: Deployment & cloud basics
BehaviouralSeniorFull-Stack Engineer
Tell me about a time an early data model decision came back to hurt you. What did you learn, and how did you fix it?
Tests: Data modelling & databases
BehaviouralAny levelFull-Stack Engineer
Tell me about a time you pushed back on or changed a feature request because you thought there was a better way to solve the user's problem.
Tests: Product thinking
BehaviouralAny levelFull-Stack Engineer
How do you keep product managers and designers informed when a feature is taking longer than expected?
Tests: Communication
TechnicalEntry levelMobile Engineer
Can you explain the lifecycle of a screen in an iOS or Android app, and why it matters when you load data?
Tests: Platform fundamentals
TechnicalEntry levelMobile Engineer
How do you make sure your app's screens adapt to different screen sizes, dark mode and larger text settings?
Tests: Mobile UI & app architecture
TechnicalEntry levelMobile Engineer
Imagine a user opens your app on a subway with no signal. What should the app do, and how would you build that?
Tests: Offline & networking
CaseMid levelMobile Engineer
How would you build a scrolling list of thousands of items so it stays smooth on an older phone?
Tests: Performance & battery
System designMid levelMobile Engineer
What architecture pattern do you use to structure your app's screens and logic, and why that one?
Tests: Mobile UI & app architecture
TechnicalMid levelMobile Engineer
Your crash reporting shows a spike after a release, but only on some devices. How do you track it down?
Tests: Mobile testing & crash monitoring
TechnicalMid levelMobile Engineer
How do you handle work that has to keep running when the user leaves the app, such as uploading a photo?
Tests: Platform fundamentals
TechnicalMid levelMobile Engineer
Walk me through how you get a release out to the app stores, including how you handle a rejection or a bad build.
Tests: Release & app store process
TechnicalSeniorMobile Engineer
Since you can't force users to update, how do you design your app and backend so old versions keep working?
Tests: Release & app store process
TechnicalSeniorMobile Engineer
Would you choose native development or a cross-platform framework like Flutter or React Native for a new app? What would drive that decision?
Tests: Mobile UI & app architecture
TechnicalSeniorMobile Engineer
How would you find and fix an app that users say drains their battery?
Tests: Performance & battery
BehaviouralAny levelMobile Engineer
Tell me about a time user reviews or feedback changed how you built something in your app.
Tests: User empathy
BehaviouralAny levelMobile Engineer
Tell me about a time you worked closely with a backend or design teammate to solve a problem neither of you could fix alone.
Tests: Teamwork
TechnicalEntry levelEmbedded Systems Engineer
What does the volatile keyword do in C, and when would you need it in firmware?
Tests: C & C++ for constrained devices
TechnicalEntry levelEmbedded Systems Engineer
Can you explain the difference between I squared C, SPI and UART, and when you might pick each one?
Tests: Hardware interfaces & protocols