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Built by students, for students — practice company-specific OAs, DSA sheets, and real interview experiences to land your dream role.

Ready to crack your next OA?

Practice company-specific questions trusted by thousands of students across India.

Start Practicing Go Premium

OA Practice·DSA·Placements

Disclaimer: OAHelper is an independent educational platform. We (oahelper.in) do not own the images or questions shown. Content is uploaded by users.

Topic Difficulty

Hard Design OA Questions

Practice 20+ hard Design coding questions from real online assessments. Filter by company, solve in the OAHelper editor, and prepare for company-wise OAs.

All Design easy medium

Where to Place Servers?rubrikHard Threading in a Chat Applicationcapital oneHard Develop a system that calculates usage fees for a storage service!money forwardHard LFU CachedezervHard

Squirrel Research

optiver

Hard

LFU CachedevrevHard

Locking the tree of spacejuspayHard

Custom HashMaphighradiusHard

Satellite Communication Networkgoldman sachsHard

Locking the tree of spacejuspayHard

Unique Bytes ReceivedautodeskHard

Directory Structure (SDE Question) - Part Anamma yatriHard

LFU CacheethosHard

Space Mission Research PartsadobeHard

NewsProvideroptiverHard

StackOverFlow SystemmeeshoHard

Multi-Core Cache SimulatornutanixHard

LFU Cache ImplementationmeeshoHard

LFU Cache Implementationat&tHard

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Hard Design OA Questions | OAHelper