Mock Interviews

Watch the interview.
Learn the patterns.

Annotated mock interview transcripts for system design — each a 45-minute simulation with inline coaching annotations that highlight what earns points and what falls flat. Study the dialog patterns before your next interview.

5 mock transcripts4 topic clusterspress ⌘K to search

Social & Media

1 shipped
Mock Interview6 min read

Mock Interview: Design Instagram — Mock Transcript

45-minute whiteboard mock: Design Instagram. The candidate is expected to cover photo/video upload, feed generation, social graph, and storage at scale. This transcript captures a strong performance with specific callout

Marketplace & Booking

1 shipped
Mock Interview7 min read

Mock Interview: Design Uber — Mock Transcript

45-minute whiteboard mock: Design Uber. The candidate should cover ride matching, real-time location tracking, dispatch, ETA computation, and surge pricing. This transcript captures a strong performance where the candida

Infrastructure

2 shipped
Mock Interview7 min read

Mock Interview: Design a Distributed Cache — Mock Transcript

45-minute whiteboard mock: Design a Distributed Cache. The candidate should cover data partitioning, eviction strategies, replication, persistence trade-offs, and failure handling. This transcript shows a candidate with

Mock Interview7 min read

Mock Interview: Design ChatGPT — Mock Transcript

45-minute whiteboard mock: Design ChatGPT. The candidate should cover LLM serving infrastructure, token generation, conversation management, safety pipelines, and scaling inference. This transcript captures a candidate w

Financial & Trading

1 shipped
Mock Interview7 min read

Mock Interview: Design a Payment Gateway — Mock Transcript

45-minute whiteboard mock: Design a Payment Gateway. The candidate should cover payment processing, idempotency, ledger design, webhook delivery, and fraud prevention. This transcript features a candidate who opens with