Amazon Software Engineer II SDE2 interview questions

There was an online assessment. technical rounds and behavioural. It was around 3 hours. Got a response after 3 months and had 3 rounds of interview, 1 hour each. started with behavioural and then moving to technical coding questions.

Data Structures • HashMaps / Dictionaries: insertion, deletion, lookup, counting frequencies. • Arrays & Strings: sliding window, two pointers, prefix sums. • Linked Lists, Trees, Graphs basics if asked. b. Algorithms • Sorting and searching. • Hash-based problems (two-sum, subarrays with sum k, etc.). • Recursion and backtracking for small problems. c. SQL & Database • Complex joins, aggregations, subqueries. • Optimizing queries. • Data transformation (ETL) logic.