Google Backend Engineer Interview Questions

4800+ verified questions, indexed by team and level. Real questions submitted by candidates who completed Google loops in the last 24 months.

About the Google Backend Engineer hiring loop

Google rounds are scored on four axes: GCA (general cognitive ability), RRK (role-related knowledge), leadership, and Googleyness. Questions are filtered to the specified role and indexed by team (Search, Cloud, YouTube, Ads, Pixel, DeepMind, Verily, Waymo).

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 Google 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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