Hello!

This post is about my interview expereince for sde intern role at allen.

Comp. and other details - https://leetcode.com/discuss/post/6046603/sde-intern-allen-bangalore-by-anonymous_-1k73

round - 1
q1 - explain linkedlist datastructure and how do you reverse a linkedlist
(more of a warmup question after some intro)
q2 - was asked about heap and it's internal implementation
q3 - explain Tree data structure and 2 easy qns around it like diameter and height (dont exactly remember)
q4 - alien dictionary (graph)

round - 2
non-technical, talked about background a little bit and about the role's responsibilities

round - 3
this was dev focused mostly js and react. I dont remember the exact questions asked but the format was like for js there were some code snippets and you were expected to tell the output, If you have good knowledge of js like promises, event loop, some keywords like typeof you can easily crack this and for react it like you are asked about some topic lets say useContext you have to explain about the hook and write some code using it explaining it feature, the same followed for few more topics. Also I was asked about the projects that I built and I explained it completely from scratch like problem it solves, techstack used, critical areas e.t.c..