Top 50 design patterns Interview Questions
The most frequently asked design patterns questions across all roles and companies, ranked by real interview frequency. Updated daily.
Design an OOP parking lot system in Python using classes, abstraction, and efficient spot tracking.
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PhonepeSimulate trailing-edge debouncing for Dream11 search events using timestamps and a pending event.
Intercontinental Exchange HoldingsImplement a Singleton class that preserves one instance, initializes state once, and remains safe under concurrent construction.
American ExpressBuild an extensible OOP text pipeline whose normalization, tokenization, and frequency stages compose cleanly.
AnthropicExplain how to implement a singleton safely under concurrency and avoid race conditions during initialization.
HERE Technologies
MotorolaCCadence Design SystemsSign up to see every question
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Tests ownership and prioritization when mobile requirements are ambiguous and the candidate must align stakeholders to ship.
NexHealth
Stealth Startup
KabbageTests leading through ambiguity in mobile architecture decisions, with ownership, influence without authority, and prioritization under delivery pressure.
Cspring
Capgemini FSSBU
ArthrexExplain how you choose between reusing an existing design pattern and creating a custom UX solution.
Capital One
Diversified Services Network
ComcastRank active HSBC employees by division and return every employee tied for the highest or second-highest salary.
HsbcUse a CTE, joins, and distinct aggregates to calculate Meta Logistics bookstore payment metrics.
Meta LogisticsUse a CTE, join, and conditional aggregation to summarize valid monthly user activity.
Adobe