My Meituan Technical Interview Experience: Detailed Q&A on Backend Development Topics

The author shares a step‑by‑step account of four interview rounds with Meituan, starting with a brief background on how the resume was revised and the first 20‑minute technical phone interview, which covered self‑introduction, data‑structure knowledge, linked‑list three‑point division, MVC architecture, and basic design patterns.

The second round, a 60‑minute technical interview, delved deeper into Spring (IOC, AOP, MVC), multithreading (synchronized, volatile, re‑entrant locks), collections (HashMap implementation and thread‑safety), JVM memory management and garbage‑collection algorithms, process vs. thread differences, HTTP state handling, Java I/O vs. NIO, a brief front‑end/Ajax overview, thread‑pool design, common design patterns, MySQL indexing and optimization, transaction isolation levels, and familiarity with Hibernate, MyBatis, Git, and basic Linux commands.

The third interview added an online coding segment where the candidate solved a two‑sum problem on an unordered array, discussed sorting for unordered inputs, and described a method to find duplicate URLs using a HashMap.

The final HR interview, although labeled as HR, turned technical, revisiting self‑introduction, detailed project discussion, large‑table MySQL optimization (partitioning), graduate‑research topics, and confirming internship timing.

Throughout the report, the candidate reflects on the interview atmosphere, the interviewers' focus on design and system knowledge, and provides personal tips for preparation, especially for high‑concurrency and big‑data roles.