Blinkit
Blinkit

Software Development Engineer 1

Redis Pub/Sub vs Apache Kafka Trade-offs

Medium
Round 3 (Cultural Fit — ~50 mins)system_designCandidate Selected

Compare Redis Pub/Sub and Apache Kafka. Discuss trade-offs regarding message persistence, consumer grouping, backpressure, and delivery guarantees.

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Blinkit Software Development Engineer 1 Interview Experience

The Blinkit interview process consisted of three comprehensive rounds evaluating problem solving, high-level system design, and cultural alignment. Round 1 focused on data structures, algorithmic coding, and core CS fundamentals. Round 2 deeply evaluated system design skills through designing a scalable promo code engine alongside distributed systems and database concepts, while Round 3 covered behavioral questions, project architecture, and messaging tradeoffs. Overall, the interview was moderately difficult with an emphasis on production systems, distributed caching, and practical engineering trade-offs.

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