Flipkart Interview Questions 2026

Design Flipkart's flash sale system. The system must handle 1M concurrent users trying to buy a limited inventory of 10K items without overselling. Walk through the inventory locking, queueing, and database isolation strategy.

Design Flipkart's product search and ranking system. A user searches "wireless earphones under 2000". How do you retrieve, rank, and filter 10,000+ matching products in under 200ms?

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.

Given a stock price array, find the maximum profit you can make with at most two buy-sell transactions. Discuss the DP state and how it generalizes to k transactions.

How would you prioritize between fixing a bug that affects 1% of users vs shipping a new feature requested by the sales team for a key enterprise client? Walk me through your reasoning.

Describe a time you had to convince a skeptical stakeholder to adopt a technical solution. What data or arguments did you use and what was the outcome?

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.

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.

You launch a feature and metrics show only 8% adoption in the first month. How do you diagnose and respond?

You need to implement infinite scroll in React. The list fetches 20 items per page. Users scroll down, new items load. When they scroll back up, previously loaded items should still be there. How do you implement this correctly?

Design a notification system for Flipkart that sends 10 million push notifications during a sale event in 5 minutes. Some notifications are personalized (user-specific deals), some are broadcast.

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.