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Capital One Interview Question Bank
Capital One's engineering loop is unusually predictable: a long CodeSignal OA gates everyone, then a single Power Day stitches four 45-60 minute rounds — coding, system design, case study, and behavioral — back to back. The technical bar is moderate but the case study and BQ rounds carry real weight, especially for MLE / Applied Research / Data Science where the business-context framing of a model decision is the differentiating signal.
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OJ Problems
practice in the online judgeData Challenge: Presentation + Coding (Python, Data Processing)Dynamic Wall Building and Range QueryQueue Check-in Simulation with Capacity LimitCheck Whether a Cyclic Shift Can Make the Array Strictly DescendingCount Numbers with Even Number of DigitsMinimum Increment Operations to Make Heights Strictly +/-1 MonotonicImplement a Given Array Algorithm (Iterative Reduction by First Non-zero)First Day Index Where Cumulative Visits Reach TargetSimple Bank System (Withdraw/Deposit/Transfer)Warehouse Package Allocation with Closures and ResetCount Case-Insensitive Symmetric Triplets in a StringPhone Battery Rotation With Recharge TimesReorder a Singly Linked List in L0→Ln→L1→Ln-1… OrderML Coding: Top-p (Nucleus) SamplingML Coding: Implement Linear Regression (from scratch)Implement Test HarnessMatrix ManipulationOrdered Fragment Pairs String-Counting ProblemRound-robin Server SimulationCount alternating odd/even subarraysMatrix operation maximum value - digit, +, -, right or down, can't change directionIf first and last letters are vowels, reverse the middle stringDesign a Transaction ClassCase InterviewImplement Bank Account OperationsValidate Virtual Credit Card TransactionMinimum Batteries to Maintain CallDistribute Numbers into Two ArraysFind Case-Insensitive TripletBanking System with Transaction Activity