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Optiver
Optiver Software Engineer Interview Guide 2026
Complete Optiver Software Engineer interview guide. Learn about the interview process, question types, and preparation tips. Practice 290+ real interview questions covering algorithms, low-latency systems, C++, and quantitative reasoning.
6 min read
Updated Apr 2026
294+ practice questions
294+
Practice Questions6
Rounds6
Categories6 min
ReadTL;DR
Optiver's Software Engineer interview is intense and heavily focused on C++, low-latency systems, and quantitative reasoning. As a global market maker, Optiver builds some of the fastest trading systems in the world, and they need engineers who understand performance at every level of the stack. The process typically includes an online assessment (coding and math), one or two technical phone screens, and a full-day onsite with five to six rounds. Expect hard algorithmic problems in C++, systems design questions focused on microsecond-level latency, and probability and mental math tests. Optiver also values cultural fit and tests for intellectual curiosity, teamwork, and competitive drive. The process usually takes 4 to 8 weeks. Compensation is extremely competitive, with large performance bonuses.
4-8 weeks
294+ questions
Sample Questions
294+ in practice bank
Design a low-latency order book data structure
Implement an order book that supports add, cancel, and modify operations in O(1) or O(log n) time. Discuss memory layout, cache optimization, and how to minimize allocations in the hot path.
Implement a ring buffer optimized for single-producer single-consumer use
Design a lock-free SPSC queue using atomic operations. Discuss cache line padding, memory ordering (acquire/release), and how to avoid false sharing.
Design a market data feed handler that normalizes data from multiple exchanges
Design a system that receives market data via multicast UDP, parses exchange-specific protocols, normalizes into a common format, and distributes to downstream consumers with minimal latency.
Explain how TCP Nagle's algorithm can cause latency issues and how to mitigate it
Discuss Nagle's algorithm, TCP_NODELAY, delayed ACKs, and how these interact to cause latency spikes in trading systems.
Given two sorted arrays, find the median of the combined sorted array in O(log(min(m,n))) time.
LRU Cache
Design a data structure that follows the constraints of a Least Recently Used cache with O(1) get and put operations.
Given n non-negative integers representing an elevation map, compute how much water can be trapped. Solve in O(n) time and O(1) space.
Compute 37 x 48 in your head within 10 seconds
Optiver includes a mental arithmetic test. Practice multiplying two-digit numbers, percentages, and quick estimations. Speed and accuracy both matter.
You have 10 coins, 3 of which are biased (60% heads). You pick a coin at random and flip it 5 times, getting 4 heads. What's the probability the coin is biased?
Apply Bayes' theorem with binomial probabilities. Set up the prior, compute the likelihoods, and calculate the posterior probability.
What's the expected value of the maximum of N uniform random variables on [0,1]?
Derive the CDF of the maximum, compute the expected value using integration, and verify with the formula N/(N+1).
Implement a memory pool allocator for fixed-size objects
Design an allocator that pre-allocates a chunk of memory and serves fixed-size allocations in O(1). Discuss how this eliminates malloc overhead in the hot path.
What happens when you call a virtual function in C++? Explain the vtable mechanism.
Explain virtual dispatch, vtable layout, vptr overhead, and why virtual functions have performance implications in latency-critical code. Discuss alternatives like CRTP.
About the Interview Process
Optiver's interview is one of the most demanding in trading technology. They test the full spectrum: algorithmic coding, systems programming, mathematical reasoning, and mental arithmetic. The process is thorough and the bar is very high. They're looking for engineers who can build systems that compete at nanosecond precision in global markets.
Online Assessment
Coding problems (typically in C++ or your preferred language) plus a mental arithmetic test. The coding problems range from medium to hard. The mental math section tests speed: multiplication, division, percentages, and estimation. Both matter.
Technical Phone Screen
One to two coding problems, often with C++ flavor. Expect questions about memory management, data structures, and algorithm optimization. The interviewer may also ask C++-specific questions about move semantics, templates, or concurrency primitives.
Onsite: Coding Rounds (2-3)
Hard algorithmic problems, often requiring optimal solutions. Optiver values both correctness and performance. Common topics: advanced data structures, graph algorithms, dynamic programming, and bit manipulation. C++ is preferred but not always required.
Onsite: Low-Latency Systems Design
Design a trading system component. Topics include order book implementation, market data handling, risk calculation engines, and networking. Optiver cares about nanosecond-level optimization: cache layout, lock-free programming, kernel bypass, and FPGA awareness.
Onsite: Math & Probability
Probability theory, combinatorics, and brain teasers. The problems test logical reasoning and mathematical intuition. Mental arithmetic may also be tested separately. Optiver expects quantitative fluency from all engineers, not just quants.
Onsite: Behavioral & Culture Fit
Optiver evaluates teamwork, competitiveness, and intellectual curiosity. They want people who are passionate about building the fastest systems, enjoy problem-solving, and work well in a high-performance team environment.
Timeline
4 to 8 weeks from application to offer. The onsite is typically a full day, and scheduling can take time.
Tips
Practice mental arithmetic daily. Optiver's math test catches many candidates off guard. Use apps or flashcards for speed drills.
C++ proficiency is nearly essential. Study modern C++ (17/20), move semantics, RAII, templates, and constexpr.
Learn about kernel bypass networking (DPDK), lock-free data structures, and NUMA-aware programming.
Practice hard LeetCode problems with a focus on optimal solutions and clean code.
Study probability from 'A Practical Guide to Quantitative Finance Interviews' or 'Heard on the Street.'
Understand how modern CPUs work: cache hierarchies, branch prediction, out-of-order execution, and SIMD.
Why low-latency matters at Optiver
Optiver is a global market maker, which means they continuously provide buy and sell prices on financial instruments. In this business, speed is directly tied to profitability and risk management. If your system is slower than a competitor's, you lose trades you should have won or take on risk you didn't intend to.
This creates genuinely interesting engineering challenges. You're optimizing at every level of the stack: custom network drivers to bypass the kernel, memory pools to avoid malloc, cache-aligned data structures to minimize misses, and lock-free algorithms to eliminate contention. Every nanosecond matters, and the problems are technically deep.
The mental arithmetic component
Optiver is one of the few tech companies that tests mental arithmetic as part of their engineering interviews. The test involves rapid-fire math problems: multi-digit multiplication, division, percentages, and quick estimation.
This isn't arbitrary. Market makers need to think quantitatively and react quickly. The mental math test evaluates your numerical fluency and ability to perform under time pressure. Many technically strong candidates are surprised by this round, so dedicated practice is important. Use apps like Zetamac or similar tools to build speed. The bar is high: you need to be both fast and accurate.
Leveling & Compensation
| Level | Title | YoE | Total Comp (USD/yr) |
|---|---|---|---|
Graduate | Graduate Software Engineer | 0-2 yrs | $180k - $350k |
SDE | Software Engineer | 2-5 yrs | $300k - $600k |
Senior | Senior Software Engineer | 5-10 yrs | $450k - $950k |
Lead | Lead Software Engineer | 10+ yrs | $650k - $1500k |
Graduate Software Engineer
Strong CS fundamentals and eagerness to learn. Can write clean C++ code and has basic understanding of systems programming. Competitive programming background is a plus.
Software Engineer
Independently develops trading system components. Deep C++ skills, understanding of low-latency patterns, and ability to optimize for performance. Can debug complex production issues.
Senior Software Engineer
Leads the design of critical trading infrastructure. Expert in low-latency systems and C++. Drives architectural decisions and mentors engineers. Deep understanding of market microstructure.
Lead Software Engineer
Sets technical direction for the engineering organization. Recognized expert in trading systems and low-latency computing. Drives innovation that gives Optiver a competitive edge.
How to Stand Out
Behavioral Focus Areas
Competitive drive: passion for building the fastest, most reliable systems
Teamwork: collaborating closely with traders and researchers to deliver results
Intellectual curiosity: genuine interest in markets, systems, and problem-solving
Ownership: taking responsibility for system performance and reliability
Continuous improvement: always looking for ways to shave off another nanosecond
1.
Mental math practice is non-negotiable. Start early and practice daily with timed exercises.
2.
C++ is the primary language. Know the difference between std::move and std::forward, understand template metaprogramming basics, and be comfortable with memory management.
3.
For systems design, think at the hardware level: L1/L2/L3 cache sizes, memory bandwidth, and PCIe latency. These numbers matter.
4.
Practice probability problems regularly. Bayesian reasoning and expected value calculations come up frequently.
5.
Understand how network stacks work: TCP vs. UDP, multicast, and kernel bypass options.
6.
Competitive programming experience is valued. If you have Codeforces or TopCoder ratings, mention them.
7.
Optiver has offices in Amsterdam, Chicago, Austin, and Sydney. Each has a distinct culture but the same technical bar.
Recommended Resources
Effective Modern C++ by Scott Meyers
A Practical Guide to Quantitative Finance Interviews by Xinfeng Zhou
Cracking the Coding Interview by Gayle Laakmann McDowell
FAQ
Do I need to know C++ for Optiver?
C++ is the primary language for trading systems at Optiver, and it's strongly preferred for interviews. You might be able to use another language for the coding assessment, but systems design and many onsite questions assume C++ knowledge. If you're serious about Optiver, invest time in learning modern C++ well.
How important is the mental math test?
Very important. It's a real filter. Candidates who can't pass the mental arithmetic assessment are typically not advanced to the onsite regardless of coding ability. Practice is essential. Use Zetamac or similar tools and aim for consistently high scores. The good news is that it's a learnable skill with practice.
How does Optiver compensation compare to FAANG?
Optiver typically pays more than FAANG, especially for mid-career and senior engineers. Total compensation includes base salary plus a performance bonus that can be 50-200%+ of base. The bonus is directly tied to firm performance and your individual contribution. In strong years, total comp can significantly exceed FAANG equivalents.
Do I need a finance background?
No. Optiver hires many engineers with pure CS or competitive programming backgrounds. You don't need to know about financial markets before joining. What you do need is strong systems skills, C++ proficiency, and quantitative reasoning ability. You'll learn the financial domain on the job.
What's the difference between SWE and Quant Trader at Optiver?
Software Engineers build the trading infrastructure: matching engines, market data systems, risk calculators, and networking stack. Quant Traders develop trading strategies and pricing models. Both roles require quantitative skills, but SWE is more systems-focused while trading is more math and strategy-focused. The interviews overlap in math and probability but diverge in systems vs. trading knowledge.
How is the work culture at Optiver?
Optiver has a collaborative, high-performance culture. Engineers work closely with traders and researchers. The pace is fast and expectations are high, but the environment is collegial. Work-life balance is generally better than investment banks. Optiver invests in social events, office amenities, and team building. The offices in Amsterdam and Chicago are well-regarded.
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