LeetCode

LeetCode is the default gym for coding interviews, and has been for years. Whatever you think of algorithm puzzles as a hiring filter, most technical screens still look like a LeetCode problem, so practicing here is practicing the actual test. Thousands of problems, an in-browser editor, and a community that has discussed nearly every solution to death.

What LeetCode does

• Thousands of coding problems across difficulty levels and topics
• Company-tagged question lists on Premium, based on reported interviews
• Mock assessments that simulate timed screens
• Discussion threads with multiple solutions and complexity breakdowns

The honest advice: grinding random problems is the slow path. Work through patterns deliberately, redo problems you missed, and practice explaining your approach out loud, because the interview is a conversation, not a submission.

Pricing

The free tier includes a large share of the problem library and is plenty for building fundamentals. Premium, a subscription, adds the company-tagged lists, more problems, and extra tooling. It's most worth it in the weeks before interviews at specific companies. Check the current price on their site.

Who LeetCode is for

• Engineers with technical screens anywhere on the horizon
• Recently laid-off developers who are rusty on algorithms after years of real work
• New grads facing their first round of coding interviews

How LeetCode fits an Offboard search

LeetCode builds the general muscle; Offboard tells you where to point it. Paste a posting and Offboard generates interview prep from the actual role, so you know whether to expect algorithms, system design, or something else entirely. When you're ready to practice under real pressure, Interviewing.io offers mocks with real engineers, and Exponent covers the non-coding rounds.