Eternal

Role: SDE-1

College: Not Specified

Interview Date: April 30, 2025

Interview Type: Full-Time

Result: Selected

Difficulty: Medium-Hard

Rounds: 3 rounds

Topics Asked: Kafka (usage in previous projects, fault tolerance, load balancing, failures, real-world use cases), Data Structures, Algorithms (story-based problem blend of House Robber II + Combination Sum), System Design (collect credentials from multiple financial apps, scrape data, process, generate analytics), API design, Database design, Scalable ideas, Adaptation during system design discussions.

Experience:

The candidate, with 2.3 years of experience, described Blinkit's interview process as "short, crisp, and focused."

Round 1: DSA + Kafka Curiosity
The interviewer noticed "Kafka" multiple times on the candidate's resume, leading to a discussion about its usage in previous projects, fault tolerance, load balancing, failures, and real-world use cases. This was followed by a DSA problem, described as a blend of "House Robber II" and "Combination Sum." The candidate walked through both recursive and memoized approaches, which satisfied the interviewer.

Round 2: System Design
This round was conducted by an SDE-3 and was "deep into systems thinking." The interviewer presented an open-ended problem: design a system to collect credentials from multiple financial apps, scrape data, process it, and generate analytics for users and admins. The candidate had to dynamically adapt the architecture as new admin-level analysis requirements were added. The round extended beyond the allotted time as the candidate kept pitching scalable ideas (e.g., analytics with pie charts, generic services). A pro tip was to practice using tools like draw.io or Alphine beforehand.

Round 3: Hiring Manager Round
This round focused on typical questions about past experience and reasons for switching jobs. An offer was extended during the call itself, with the last 10 minutes used for compensation discussion. The hiring manager was impressed with the candidate's understanding of Kafka.

The entire process, from application to offer, was completed in 2 weeks.