Technical interviews are the strangest beast in the hiring world. You need to nail three things simultaneously: raw coding ability, structured verbal communication, and interview psychology. Plenty of engineers grind 500 LeetCode problems and then fail the first round on “Tell me about the hardest bug you ever tracked down.”

This article follows the real training log of a backend engineer — let’s call him Chen — as he builds a complete AI mock interview training system across all three technical interview modules over two weeks.