ByteDance Backend Engineer Interview Questions

1700+ verified questions, indexed by team and level. Real questions submitted by candidates who completed ByteDance loops in the last 24 months.

About the ByteDance Backend Engineer hiring loop

ByteDance / TikTok interviews favour fast-paced, ML-recommendation-heavy system design. Internal ladder is 1-1 to 4-2. Coding rounds use LeetCode-style problems. Behavioural rounds emphasise ownership and ambiguity tolerance.

Backend rounds score on API design quality, database-tier reasoning, scalability anchoring, and operational maturity (observability + reliability). Trade-off articulation differentiates Senior from Mid.

Topics covered in ByteDance Backend Engineer interviews

  • 01API design (REST, GraphQL, gRPC, idempotency, versioning, pagination)
  • 02Database design (relational vs document vs wide-column, indexing, query plans)
  • 03Caching strategies (read-through, write-through, write-back, invalidation)
  • 04Concurrency + async (threads, event loops, queues, distributed locks)
  • 05Authentication + authorization (OAuth, JWT, RBAC, ABAC, session management)
  • 06Observability (logs, metrics, traces, SLOs, error budgets)

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