TCS (Tata Consultancy Services) Backend Engineer Interview Questions

6400+ verified questions, indexed by team and level. Real questions submitted by candidates who completed TCS (Tata Consultancy Services) loops in the last 24 months.

About the TCS (Tata Consultancy Services) Backend Engineer hiring loop

TCS hires across three tracks — TCS NQT (₹3.36 LPA), TCS Ninja (₹3.36–4.5 LPA), and TCS Digital (₹9–11 LPA). Each track has different rubric weights, coding-language acceptance (C/C++/Java for Ninja; Python added for Digital), and HR-round expectations.

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 TCS (Tata Consultancy Services) 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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