Topic Difficulty

Hard Design OA Questions

Practice 30+ hard Design coding questions from real online assessments. Filter by company, solve in the OAHelper editor, and prepare for company-wise OAs.

All Designeasymedium
Splits And Joins In A Tiered Tray RackmicrosoftHardByte-Budgeted GPU Buffer Cache with Pinned BuffersappleHardCounting Unbroken Blocks in Each Locker BankinfosysHardTask Scheduler With Subtasks and Deadline UpdatestescoHardTreasury Settlement LedgerstripeHardLimit Order Matching EnginecitadelHardSmart Fridge Inventorywells fargoHardBanking System Query ProcessorairbnbHardOverheat ControlleroptiverHardJupyter Server Load BalancerstripeHardFruit Stall Step Queriesoyo_1augHardBank Fraud Risk Transaction ReportflipkartHardRate limiter design for the campus API gateway - 2ciscoHardRate limiter design for the campus API gateway - 1ciscoHardMemory Buffer with Access-Based ReplacementoyoHardCity Skyline — Zoning Laws, Construction Decrees & AuditsinmobiHardIn-Memory Cache with Eviction PolicieskaigenticHardWhere to Place Servers?rubrikHardSquirrel ResearchoptiverHardLFU CachedevrevHardLocking the tree of spacejuspayHardCustom HashMaphighradiusHardSatellite Communication Networkgoldman sachsHardLocking the tree of spacejuspayHardLocking the tree of spacejuspayHardUnique Bytes ReceivedautodeskHardDirectory Structure (SDE Question) - Part Anamma yatriHardLFU CacheethosHardSpace Mission Research PartsadobeHardNewsProvideroptiverHard
microsoft OA questionsapple OA questionsinfosys OA questionstesco OA questionsstripe OA questionscitadel OA questionswells fargo OA questionsairbnb OA questions

Summarise with AI

  • ChatGPT
  • Claude
  • Perplexity
  • Grok
  • Google AI Mode
Your next OA is closer than you think.Real questions from this season's OAs
ProductCompany OAsAll ProblemsOA CalendarMock OAsDSA RoadmapSQL RoadmapAgent Engineering
ResourcesInterview experiencesTopicsOA GroupsContributeCompany InsightsOA StorePremiumFor Colleges
OA Helper, powered by NxtWave
TermsPrivacyRefundsTrust & SafetyContact© 2026 OA Helper

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