Interview Experience and Preparation Guide for Backend Engineer Positions at ByteDance, MiHoYo, Futu, and Yuanfudao

Background

After three years since the last interview and amid the 2022 industry layoffs, the author reflects on personal growth and the job market, aiming to assess technical level and market conditions through interview experiences.

Interview Preparation

The author worked on marketing data analysis, supply‑chain logistics, and social‑media ad delivery, and stresses converting business experience into technical models on the résumé. Emphasis is placed on core fundamentals—computer networks, databases, operating systems—and building distributed, micro‑service, and service‑governance knowledge. A "no‑effort" preparation approach is also described to gauge real capability.

Interviews

Four companies are covered: ByteDance, MiHoYo, Futu, and Yuanfudao. For each, interview processes, questions, and answers are listed, covering topics such as index push‑down, Redis, Go maps, sync.Map, distributed locks, CDC, database migration, and coding problems.

ByteDance

First round focused on business knowledge.

Second round included questions about index push‑down, index failure scenarios, NOT IN queries, and Liveness Probes.

Follow‑up questions covered team size, testing, on‑call duties, and release cadence.

MiHoYo

Basic questions, heavy on Go data structures (map, sync.Map, context).

Discussed map implementation, rehash, panic/recover, CAS, and Redis distributed lock.

Futu

Coding question with Go functions and defer.

In‑depth discussion of Go map internals, concurrency safety, sync.Map, channel behavior.

Yuanfudao

Infrastructure‑oriented questions, CDC synchronization, and system design.

Summary

The interviews were not extremely difficult; most interviewers were patient. Basic knowledge was emphasized more than expected, highlighting the importance of solid fundamentals for engineers.

Recommendations

Read USENIX conference papers for cutting‑edge research.

Study operating‑system fundamentals.

Use Go interview books and blogs (e.g., Draveness, Russ Cox).

Learning / Review Path

Lists Go resources: Go by Example, Learn Go with Tests, and several books covering core language, advanced topics, and interview preparation.

References

Links to original interview posts, USENIX, books, and blogs.

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