DESIGN QUESTION BANK 1 min read Library →

Design digital-video KYC (know your customer) verification system

Media transfer and delivery interview practice prompt.

Functional requirements (FR)

  • Accept media uploads or source references and track each asset through its processing lifecycle.
  • Resume interrupted transfers and expose progress, validation, processing, and failure status.
  • Make completed media discoverable and deliverable to authorized clients in supported formats or qualities.
  • Support lifecycle actions such as retry, cancel, delete, or retention according to the prompt.

Non-functional requirements (NFR)

  • Support large files, unreliable networks, bursty ingest, and efficient bandwidth use.
  • Define processing latency, playback or download startup, and availability targets.
  • Protect content and user data with access controls, integrity checks, and retention policies.
  • Scale storage and processing capacity while making failures, backlog, and cost visible.

Principal-level discussion

  • Define the scale, success measures, and operational ownership before committing to an architecture.
  • Compare at least two viable approaches and explain the trade-offs, migration path, and failure behavior.
  • Identify the riskiest assumptions and how you would validate them with data or a staged rollout.

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