#testing

13 testing interview questions, asked at Google, Glean, Snowflake and 7 more companies. Last asked Oct 2026.

Fix planted bugs in an open-source library from its failing testsCodingYou get a checkout of a real open-source library (a template engine, an HTTP client or a parser) with a few bugs planted in it. Run the test suite, follow the failures into code…
Last asked Oct 2026
How would you test a system that counts the leaves on a treeCodingA testing question from a QA engineer loop, left vague on purpose: how would you test a system that counts the leaves on a large tree? First pin down what the system is and what…
Last asked Sep 2026
Read text values of web elements with SeleniumCodingLocate two web elements and read back their text values with a browser automation script. Reported on 1point3acres' Glean bank; reconstructed in our own words.
Last asked Sep 2026
How would you verify a smile detector in a photo app?ML designYou are on the Google Photos team and your feature detects smiling faces in photos. How would you check that the detection is correct? Cover what counts as a smile and who decides…
Last asked Sep 2026
Build and test a rate limiter with an AI assistantCodingIn a round where AI coding assistants are allowed, design and build a rate limiter from scratch. You choose the algorithm and the interface, use the assistant as you like, and…
Last asked Sep 2026
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Review a series of pull requestsCodingYou get two or three pull requests, each harder than the last, in Python or Java. Read each one, leave comments as you would on a real review, and point out bugs, design problems…
Last asked Aug 2026
Tiered rate limiter with limits that change at runtimeCodingBuild a rate-limiting service in Python. Each client belongs to a tier (for example free, pro, enterprise), and each tier has its own limit. A request arrives with a client id…
Last asked Aug 2026
Debug a Python job schedulerCodingYou own a small in-process job scheduler. It runs on a fake clock so it can be tested. Users report that: - a nightly report scheduled for exactly the end of a window sometimes…
Last asked Jul 2026
Improve a QA benchmark and regression setupCodingA role in quality assurance for hardware and software: discuss how you run benchmark and regression testing, and how you would improve it. Questions reported: how you check that…
Last asked Mar 2026
Design a simulator that replays recorded left-turn scenariosSystem designDesign a simulator that takes recorded videos of real left turns and replays them as scenarios, so an autonomous-driving stack can be tested against what actually happened on the…
Last asked Feb 2026
Make your interview solution production-readyCodingAfter solving a coding problem, the interviewer asks what you would change before the code went to production. Discuss input validation and error handling, tests, logging and…
Last asked Sep 2025
Robust Python generator, then a weighted oneCoding1. Write a Python generator that yields the numbers of an input list, with unit tests. Handle edge cases such as None values and an empty list. 2. Change it to yield numbers from…
Last asked Sep 2025
Graphics test developer screen: CI, Docker, Python and compilersCodingA screen for a graphics software test developer that is all fundamentals and a deep look at your projects. Expect detailed questions on every tool on your resume: Docker (running…
Last asked Aug 2025