Optiver Interview Questions
Practice 83 real Optiver interview questions for 2026. This Optiver interview questions collection is designed for interview preparation and includes real questions from actual interviews with detailed solutions. Lean heavily on coding and systems thinking: expect Coding & Algorithms and System Design problems first, then Statistics & Math, Behavioral & Leadership, and Analytics & Experimentation. For Software Engineer roles (the bulk of our set) recurring themes include designing low‑latency trading infrastructure and queue/data‑structure problems (circular and object‑oriented queues), algorithmic optimization and backtesting of trading strategies, and fast probabilistic/expectation calculations under time pressure. Data Scientist interviews concentrate on probability and expectation puzzles, sequence and pattern‑detection in streams, optimization puzzles (min‑moves, transforming layouts), and communicating statistical tradeoffs to traders. Use this set to simulate timed mental math and whiteboard coding, rehearse system tradeoffs that prioritize latency and correctness, and build clear STAR stories for behavioral loops.
"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"
"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"
"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."
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"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
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"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."
"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."
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"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Match alphanumeric patterns in a stream
Given a reference 7–8 character alphanumeric code and four candidate codes, select the exact match as quickly as possible. Design a system that: - Eff...
Design a queue and analyze tradeoffs
Design a FIFO queue data structure that supports enqueue, dequeue, peek, and isEmpty. Compare implementations using a singly linked list, a dynamic ar...
Implement a News Publishing System with Topic Subscriptions and Delivery Limits
You are building the core delivery engine for a news publishing service. The service continuously receives news items, stores them, and — whenever a p...
Compute negative-price probability after n steps
Random-Walk Price Crossing Probability Setup - Initial price: S₀ = s (real number). - Step size: x > 0. - Number of days: n (integer ≥ 0). - Each day ...
Compute permutations with repeated letters
Counting Strings with Repeated Characters Problem Given two nonnegative integers m and n, how many distinct strings can be formed that contain exactly...
Simulate return-weighted rebalancing strategy
Simulate return-weighted rebalancing strategy Problem: Momentum-weighted daily log-return statistics You have N assets with end-of-day prices over T t...
Cargo Order Allocation Across Departing Planes
A freight company assigns incoming shipping orders to a fixed fleet of cargo planes. You must implement the order-processing logic: decide whether eac...
Expected Wait for a Bus That Runs Late Half the Time
Buses on a certain route are scheduled to arrive at your stop every $x$ minutes. Independently for each bus, the bus arrives exactly on schedule with ...
Maximum Currency Conversion Rate
Maximum Currency Conversion Rate You are given N currency exchange rate pairs. Each pair is a triple (from_currency, to_currency, rate), meaning that ...
Validate a Binary Tree Built from Directed Edges
Validate a Binary Tree Built from Directed Edges You are given a list of directed edges. Each edge is a pair (parent, child) of positive-integer node ...
Identify OS component causing process starvation
A system with 2 CPU cores runs 5 identical processes continuously. Four processes get equal CPU time, but the fifth appears to get none. Which part of...
Count nonnegative buy/sell sequences
You must perform exactly 2n unit trades starting with 0 shares and ending with 0 shares. Each trade is either a buy (+1 share) or a sell (−1 share), a...
Days Between Two Calendar Dates
Days Between Two Calendar Dates You are given two dates as strings, each in the format YYYY-MM-DD. Write a function that returns the number of days be...
Find missing numbers in sequences
This question evaluates sequence pattern recognition, numerical reasoning with integers and rational numbers, and the ability to infer recurrences or ...
Design a circular queue data structure
This question evaluates understanding of circular buffer data structures and the ability to implement fixed-capacity queue operations with O(1) time a...
Solve a Skyscraper puzzle efficiently
Design and implement a solver for the Skyscraper logic puzzle on an $N \times N$ grid, where $3 \le N \le 7$. The board is a grid of building heights....
Design a satellite propagation simulator
Question Implement a SatelliteNetwork class that simulates message propagation over an undirected satellite graph. The class consumes a stream of inst...
Decide and implement DP/heap and approximation
You have 90 minutes to complete three related coding tasks: a) Dynamic programming: Given an integer array nums (n ≤ 2e 5) and a threshold T, design a...
Stone Pile Doubling Game: Can One Pile Be Emptied?
You are given two piles of stones containing a and b stones respectively (both piles start non-empty). You repeatedly apply the following move: - Let ...
Count the Days Between Two Dates
Count the Days Between Two Dates You are given two calendar dates as strings in YYYY-MM-DD format. Return the number of days between them as a non-neg...