Walmart SDE 3
Summary
I recently interviewed for an SDE 3 position at Walmart, which unfortunately resulted in a rejection after facing challenging DSA problems and SQL concepts.
Full Experience
I had an interview for an SDE 3 role at Walmart. The first round was a technical round focused on Data Structures and Algorithms. I was asked to find the minimum element in a sorted rotated array, which I was able to answer correctly. The second DSA question involved finding the right view of a binary tree, assuming a normal binary tree. I struggled with this one and couldn't come up with a proper answer. Additionally, there were questions on MySQL covering topics like what an index is in SQL and why indexing makes queries faster. Overall, I was rejected from this opportunity.
Interview Questions (4)
Explain what an index is in SQL.
Explain why indexing makes SQL queries faster.
Preparation Tips
Based on this experience, my key takeaways are to prepare thoroughly for binary tree problems and to deepen my understanding of the internal workings of SQL, not just basic syntax.