Easy data structure and algorithm practice puzzle.
Given an array of sensor readings, return the highest one. Walk the array once and keep the biggest value so far. Start from the first reading, not from 0, or a list of all negative readings will report a peak of 0 that never happened.
Solve it three ways: snap the jigsaw pieces together, fill in the blanks, or type it from scratch against the tests. This one is free.
Every line of the solution comes with a note explaining why it is there, and a step by step replay shows the code running. At level 3, where you type it yourself, you can ask for an AI mock interview on this problem that ends with a hiring manager's scorecard.
Then grow it into a real project with the Software Engineer button: this puzzle becomes the Event Audit Trail, a pipeline you can run and download. See every Software Engineer project.
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