StockX Software Development Engineer (SDE) interview questions

In the interview, I was presented with two Data Structures and Algorithms questions. The first required identifying and implementing a suitable data structure to manage hierarchical categories and subcategories from given paths with IDs — which led to a Trie-based solution. The second question involved efficient operations using a Priority Queue, testing my understanding of heap properties and order-based retrieval. Additionally, I was asked to explain my project in detail, where I discussed the system’s architecture, core technologies used, challenges encountered, and the problem-solving approaches I applied to make it scalable and effective.