https://github.com/gracenolan/Notes/blob/master/interview-study-notes-for-security-engineering.md
Implement a cypher which converts text to emoji
Collect logs (of any kind) and write a parser which pulls out specific details (domains, executable names, timestamps etc.)
Write a script to scrape information from a website.
Write a port scanner
Build an ssh botnet
Write a password bruteforcer
Write a mini forensics tool to collect identifying information from PDF metadata
Recover deleted items
Write a program that looks for malware signatures in binaries and code samples.