Flipkart Java Interview Questions 2026
Published July 22, 2026 · Updated July 22, 2026
5 real Java interview questions asked at Flipkart. Upvoted by engineers who cleared the loop. Covers Technical, System Design rounds.
5 questions
149 engineers asked
238 upvotes
Company: Flipkart
Technology: Java
All Java Questions Asked at Flipkart
Flipkart
Medium
Technical round
Java
Implement a LRU (Least Recently Used) cache with O(1) get and put operations.
Explain the HashMap + doubly linked list approach and why a simple array or single HashMap is insufficient.
↑ 67 upvotes · 45 engineers asked this · SDE1
Flipkart
Hard
Technical round
JavaRedisPostgreSQL
Design a coupon/discount system for Flipkart Big Billion Days. The system must validate, apply, and prevent double-use of millions of coupons with high concurrency. Cover idempotency and distributed locking.
↑ 56 upvotes · 35 engineers asked this · SDE2
Flipkart
Medium
Technical round
JavaPython
Given a directed graph representing category hierarchies in an e-commerce catalog, find the shortest path between two categories. Explain BFS vs Dijkstra for unweighted vs weighted graphs.
↑ 33 upvotes · 18 engineers asked this · SDE1
Flipkart
Hard
System Design round
KafkaDistributed SystemsJava
Design Flipkart's order management system. From "Place Order" to "Delivered", walk through every state transition, the microservices involved, how you handle partial failures (payment succeeds but inventory deduct fails), and eventual consistency.
↑ 59 upvotes · 38 engineers asked this · SDE2
Flipkart
Hard
Technical round
2-6 yearsJava
What is a race condition in Java, and how does synchronized prevent it? Show a minimal example of a non-thread-safe counter and the fix.
↑ 23 upvotes · 13 engineers asked this · SDE2
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Frequently asked questions
Implement a LRU (Least Recently Used) cache with O(1) get and put operations.
Implement a LRU (Least Recently Used) cache with O(1) get and put operations.
Explain the HashMap + doubly linked list approach and why a simple array or single HashMap is insufficient.
Design a coupon/discount system for Flipkart Big Billion Days. The system must validate, apply, and prevent double-use of millions of coupons with high concurrency. Cover idempotency and distributed locking.
Design a coupon/discount system for Flipkart Big Billion Days. The system must validate, apply, and prevent double-use of millions of coupons with high concurrency. Cover idempotency and distributed locking.
Given a directed graph representing category hierarchies in an e-commerce catalog, find the shortest path between two categories. Explain BFS vs Dijkstra for unweighted vs weighted graphs.
Given a directed graph representing category hierarchies in an e-commerce catalog, find the shortest path between two categories. Explain BFS vs Dijkstra for unweighted vs weighted graphs.
Design Flipkart's order management system. From "Place Order" to "Delivered", walk through every state transition, the microservices involved, how you handle partial failures (payment succeeds but inventory deduct fails), and eventual consistency.
Design Flipkart's order management system. From "Place Order" to "Delivered", walk through every state transition, the microservices involved, how you handle partial failures (payment succeeds but inventory deduct fails), and eventual consistency.
What is a race condition in Java, and how does synchronized prevent it? Show a minimal example of a non-thread-safe counter and the fix.
What is a race condition in Java, and how does synchronized prevent it? Show a minimal example of a non-thread-safe counter and the fix.