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Blinkit Software Development Engineer 1 Interview Experience

Software Development Engineer 1

Blinkit
November 8, 2026
12 Questions
Selected

Summary

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My interview experience with Blinkit comprised three rounds focusing on DSA problems, system design, and behavioral questions. In the first round, I tackled two DSA challenges related to maximizing units in a truck and maximizing sums in a matrix. The subsequent rounds covered system design intricacies, project discussions, and technical comparisons, reflecting a medium overall difficulty, while the interviewers maintained a constructive and engaging atmosphere.

1

General

#1

Internship Experience Discussion

Discuss your internship experience.
Medium
#2

MySQL vs NoSQL

Discuss JOINs, indexes, and practical use cases for choosing between MySQL and NoSQL.
Database
NoSQL
MySQL
Medium
#3

Work Experience Discussion

Describe your previous work environment, how you handle disagreements with managers, and what you would improve in your projects.
Medium
#4

Scaling Projects

Explain how you would scale your existing project for significantly higher traffic.
Medium
#5

Caching Strategies

Discuss cache placement, invalidation, eviction policies (LRU), and compare Redis, S3, and the primary database.
Medium
#6

Python Workloads

What are the differences between I/O-bound and CPU-bound workloads, and where does Python perform better?
Medium
2

DSA

#1

Maximum Units on a Truck

Maximize the total units by selecting boxes within the truck's capacity. Each box has some units and there are a specific number of boxes.
DSA
algorithms
Medium
#2

Maximum Matrix Sum

Given an integer matrix, maximize its sum by repeatedly flipping the signs of two adjacent elements. Example Input: [[1, -2], [3, 4]], Example Output: 10.
DSA
matrix
Medium
3

System Design

#1

Personal Project Discussion

Discuss your personal project's architecture and components such as databases, background jobs, MCP servers, and tools used.
System Design
HLD
Medium
#2

APIs vs MCP

Explain the difference between APIs and MCP.
System Design
APIs
Medium
#3

Coupon Management System Design

Design a Coupon Management System by clarifying requirements, discussing edge cases, and covering HLD and functional/non-functional requirements, API design, database schema, SQL queries, coupon rule configuration, expiry using CRON jobs, and consistency.
System Design
Coupon Management
Hard
#4

Chatbot Design

Design a chatbot that answers natural-language queries using database tables. Discuss architecture, query understanding, data retrieval, RAG vs alternatives, and maintaining question banks.
System Design
Chatbot
Hard
DSASystem DesignHLDInterview Experience
A

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