Optiver Interview Experiences

5 results

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  A 90-Minute OOD/State-Machine OA on CPU Core CoolingOptiver · Software Engineer · Intern · Online Assessment · Jul 2026

  I recently finished this company's Summer SDE Intern OA, so I'm writing this post to give back to the community. There were two parts in total. One part was a HackerRank OA (90 minutes), an OOD / state machine simulation problem — a puzzle game kind of like Tower of Hanoi. Problem overview Implement an OverheatPreventionController class to simulate and manage the temperature and cooling state of…

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  A Marathon of 17 Probability OA QuestionsOptiver · Data Scientist · Online Assessment · Nov 2025

  Pick a random integer from 1 to 10,000. What's the probability that every digit of that number is different? Roll a die until you roll something greater than 4. What's the expected value of the sum of all the rolls? Draw 3 cards from a standard 52-card deck. What's the expected value of the product of the three numbers (J = 11, Q = 12, K = 13)? Toss 100 coins. Pair up an H with a T and remove tha…

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  HackerRank OA: News Subscription System DesignOptiver · Software Engineer · Online Assessment · Sep 2025

  ✅ Interview experience summary: News Subscription System design (hands-on HackerRank question) 📌 Problem background (system design) You're a news aggregation service. The goal is to give users one unified system for subscribing to all news providers, so they only receive content they're interested in without being overloaded with volume. The system needs to manage large data streams efficiently a…

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  A Brutal Four-Section OA With Coding, Pattern-Finding, and ProbabilityOptiver · Software Engineer · Online Assessment · Aug 2025

  I think their OA basically gets sent out to everyone — I got mine right after I applied. There are four sections and the intensity is pretty high. The email doesn't mention this, but you can actually do them separately, so I'd suggest doing one section per day. Coding The coding section lets you go back to earlier questions, so if you don't know how to solve one, I'd suggest skipping it first. 90…

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  Breaking Down the Four-Part OAOptiver · Software Engineer · Online Assessment · Aug 2025

  The Optiver OA is honestly pretty hard. This part is 2 medium-difficulty coding problems plus 1 approximate-solution problem, all in 90 minutes. The problem types lean toward DP (dynamic programming) and heap (priority queue) style problems — testing mathematical modeling, data structure simulation, strategy backtesting, and statistical analysis skills. Approach: before starting a problem, quickl…