Disney | Staff Software Engineer | HLD | AUG 2026
Summary
I participated in an HLD interview for a Staff Software Engineer role at Disney in August 2026, where I designed a system using Redis, inventory management, a queuing service, and idempotency checks.
Full Experience
Below Was the Question Provided for HLD round
Clarified with the interviewer with the requirements, and went ahead and discussed the approach using redis with an inventory of stock, and a waiting / Queuing service for the customer to wait. Had an Idempotency key check to make sure only one customer buys the product.
Feel free to provide your thoughts, Hope it helps the community !
Interview Questions (1)
Design a High Level System for Inventory Purchase with Idempotency
Design a system that handles high‑volume product purchases while ensuring that only a single customer can successfully buy a product. The design should include inventory management, a waiting/queue service for customers, and an idempotency key mechanism to prevent duplicate purchases.