Facebook | Meta | OA | Software Engineer | 2026 | Set-9

Question

Meta E4 Rejected | Android

 

Coding:

 

Similar to 1047. Remove All Adjacent Duplicates In String, but had to remove characters alphabetically next to each other e.g. remove “AB” and “BA” instead.

Literally 827. Making A Large Island word for word

AI round

 

Maze solver. Main algorithm in solver was BFS, had to fix tests

Behavioral

 

pretty typical questions

System Design

 

Design an app that changes the user's wallapper image from an image in a user's facebook account when they turn on their phone

not sure if it's just meta but they only gave me this prompt, no ui mocks. You really have to ask a lot of clarifying questions and come up with the requirements yourself