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Blitz Software Development Engineer Intern Interview Experience

Software Development Engineer Intern

Blitz
June 10, 2025
9 Questions
Selected

Summary

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The Blitz Software Development Engineer Intern interview process was comprehensive, consisting of multiple rounds focused on various technical areas. Candidates can expect questions on React concepts and JavaScript intricacies in the frontend rounds, followed by DSA challenges. The overall difficulty level was medium to hard, with a strong emphasis on practical coding skills, showcasing the rigorous nature of the interview experience at Blitz.

1

Frontend (React) Questions

#1

3x3 Grid Interactivity

Build a 3x3 grid where clicking on a box turns it green. When all boxes have turned green, they should revert to their original color in reverse order.
react
frontend
ui
Medium
#2

Dark/Light Mode Toggle with Context API

Create a dark/light mode toggle using React's Context API, ensuring that the UI is fully functional and responsive.
react
context-api
ui
Medium
#3

Fetch Value from Object Using Key Path

Write a function that retrieves a value from an object based on a given string key path (for example, fn(obj, "user.details.name")).
javascript
object-manipulation
Medium
#4

Discuss Redux Architecture

Discuss the architecture of Redux, including its slices, reducers, and actions. Explain how they interact within an application.
redux
state-management
Medium
2

JavaScript Concepts

#1

Explain Hoisting and Closures

Explain the concepts of hoisting and closures in JavaScript, providing examples to illustrate their functionalities.
javascript
concepts
Medium
#2

Using React.memo, useMemo, and useCallback

Discuss the use cases and benefits of React.memo, useMemo, and useCallback in optimizing React functional components.
react
performance-optimization
Medium
#3

TypeScript: Any vs. Unknown

In TypeScript, explain the differences between 'any' and 'unknown' types, and clarify when to use an interface versus a type.
typescript
type-system
Medium
3

DSA Challenges

#1

Least Number of Unique Integers After K Removals

Solve the LeetCode problem of finding the least number of unique integers remaining after performing K removals.
dsa
Medium
LeetCode Problem Link

Link to the problem description on LeetCode.

#2

Longest Valid Parentheses

Solve the LeetCode problem of finding the length of the longest valid parentheses substring.
dsa
Hard
LeetCode Problem Link

Link to the problem description on LeetCode.

frontendinterviewsoftwareengineersoftwaredeveloperinterviewexperienceblitzjavascriptinterviewtipsjobinterviewcareergrowthdsareactblitz
r

ritwik chakraborty

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