Quant Interview Practice Questions

500+ quant interview questions for Jane Street, Citadel, Two Sigma, DE Shaw, and other top quantitative finance firms.

Quant Developer Questions (90)

C++ and Python coding challenges for quant developer interviews

Binary Header Cast - easy memory_optimization question
Compacting Memory Allocator - very_hard memory_optimization question
Placement New in Buffer - easy memory_optimization question
Weak Pointer Cache - medium memory_optimization question
Custom STL Allocator - medium memory_optimization question
Flyweight Symbol Pool - hard memory_optimization question
Stack-Allocated Fixed Array - easy memory_optimization question
Reference-Counted Object Pool - hard memory_optimization question
Shared Pointer Basics - easy memory_optimization question
Memory-Mapped File Allocator - medium memory_optimization question
Chained PMR Resources - hard memory_optimization question
Cross-Venue Arbitrage Detector - very_hard architecture & logic question
FX Currency Converter - medium architecture & logic question
Order State Machine - easy architecture & logic question
Leaky Bucket Rate Limiter - medium architecture & logic question
Position Netting Engine - medium architecture & logic question
Smart Order Router - hard architecture & logic question
Full Order Book Reconstruction - hard architecture & logic question
Exchange Fee Model - medium architecture & logic question
Binary Protocol Codec - medium architecture & logic question
TWAP Order Scheduler - medium architecture & logic question
Full Price-Time Matching Engine - very_hard architecture & logic question
Basic PnL Calculator - easy architecture & logic question
FIX Message Builder - medium architecture & logic question
Tick-to-Trade Latency Measurer - hard architecture & logic question
Circuit Breaker for Exchange Gateway - hard architecture & logic question
Order Book Snapshot Builder - medium architecture & logic question
VWAP Calculator - easy architecture & logic question
FIX Session State Machine - hard architecture & logic question
Drop Copy Trade Reconciler - hard architecture & logic question
FIX Checksum Validator - easy architecture & logic question
Multi-Leg Order Builder - hard architecture & logic question
Iceberg Order Slicer - medium architecture & logic question
Cancel-Replace Order Logic - medium architecture & logic question
Sliding Window Rate Limiter - medium architecture & logic question
Implied Price Crossing Engine - hard architecture & logic question
Event-Driven Strategy Backtester - very_hard architecture & logic question
Bid-Ask Spread Calculator - medium architecture & logic question
POV Execution Algorithm - medium architecture & logic question
Strongly Typed Order Side - easy architecture & logic question
Pre-Trade Risk Limit Checker - medium architecture & logic question
Epoch-Based Memory Reclamation - hard concurrency question
Barrier Phase Synchronization - medium concurrency question
Atomic Flag Spin-Wait - easy concurrency question
Shared Mutex for Read-Heavy Data - medium concurrency question
Once-Flag Singleton Init - medium concurrency question
Atomic Shared Pointer Config - medium concurrency question
Flat Combining Order Book - very_hard concurrency question
Cooperative Queue Cancellation - easy concurrency question
Counting Semaphore Throttle - medium concurrency question
Fixed Thread Pool Executor - medium concurrency question
Work-Stealing Deque - hard concurrency question
Scoped Lock Portfolio Update - easy concurrency question
Atomic Fetch-Add Statistics - medium concurrency question
Try-Lock Spinlock with Timeout - medium concurrency question
Bounded Producer-Consumer Queue - medium concurrency question
Double-Buffer Atomic Swap - hard concurrency question
Lock-Free MPSC Queue - hard concurrency question
Hazard Pointer Reclamation - hard concurrency question
Condition Variable Event Queue - easy concurrency question
Wait-Free SPSC Queue - very_hard concurrency question
Atomic Price Publisher - easy concurrency question
Latch-Based Service Startup - medium concurrency question
Left-Right Concurrency Pattern - very_hard concurrency question
Future/Promise Async Pricing - medium concurrency question
Userfaultfd Lazy Page Loading - hard systems question
Timestamped Console Logger - easy systems question
Custom Page Table Allocator - very_hard systems question
Structured Syslog Logger - medium systems question
Daemon Process Setup - medium systems question
Process CPU Usage Monitor - easy systems question
eBPF Market Data Packet Filter - very_hard systems question
File Descriptor RAII Wrapper - easy systems question
Stack Size Configuration - medium systems question
io_uring Async Network Stack - very_hard systems question
EventFD & Circular Buffer Simulation - medium systems question
Environment Config Loader - easy systems question
Simulated io_uring Batch Reader - hard systems question
Timer FD Periodic Scheduler - medium systems question
Cgroup Memory Limit Enforcer - hard systems question
C++20 Coroutine Async Reader - medium systems question
Hot-Reload Risk Configuration - medium systems question
Memory-Mapped Tick Data Reader - medium systems question
Pipe-Based IPC Order Relay - medium systems question
Seccomp Sandbox for Strategy - hard systems question
Hardware Counters with Perf Events - hard systems question
Shared Memory Config Store - medium systems question
Process Memory Statistics - medium systems question
Coroutine Price Generator - medium systems question
Graceful Shutdown Handler - easy systems question

Quant Researcher Questions (10)

Statistical analysis and quantitative modeling problems

Liquidity Hole Simulation - hard backtesting question
Calculate Sortino Ratio - medium backtesting question
Calculate Calmar Ratio - easy backtesting question
Maximum Drawdown Calculation - easy backtesting question
Vectorized Backtest Engine - medium backtesting question
Trade Classification (Lee-Ready) - hard market_microstructure question
Order Book Imbalance Alpha - medium market_microstructure question
Slippage & Transaction Cost Modeling - medium market_microstructure question
Almgren-Chriss Optimal Execution - hard market_microstructure question
POV Execution with Market Impact - hard market_microstructure question

Quant Trader Questions (50)

Trading MCQs, probability brainteasers, and market scenarios

Expected Value of Perfect Information - hard Conditional Expected Value question
Zipf Distribution in Order Flow - hard Market Microstructure question
One-Step Binomial Model: Risk-Neutral Probability - medium Options & Greeks question
Curse of Dimensionality in Finance - medium Data Science question
Markov Chain Steady State - hard Probability & Statistics question
Dark Pool Midpoint Fill - medium Market Microstructure question
Contango and Roll Yield - easy Finance question
Drunkard's Walk - hard Probability & Statistics question
Order Book Data Structure - medium Number Theory & Algorithms question
Portfolio Aggregate Delta Calculation - medium Options & Greeks question
Entropy of a Fair Die - medium Probability & Statistics question
S&P 500 Backtest Bias - medium Regression Analysis question
Lévy Flight Trader - hard Probability & Statistics question
Conditional Independence and Marginal Independence - medium Conditional Probability question
False Discovery Rate Control - hard Regression Analysis question
Covariance Calculation - easy Probability & Statistics question
Jensen's Inequality and Log Returns - medium Probability & Statistics question
Poisson Arrival Probability - easy Probability & Statistics question
Volatility Drag Calculation - medium Finance question
Memory-Mapped Tick Data - medium Networking & Systems question
Jumbo Frames and Throughput - easy Networking & Systems question
TCP Congestion Control Impact - medium Networking & Systems question
Kernel Ring Buffer Performance - hard Networking & Systems question
NUMA-Aware Memory Allocation - hard Networking & Systems question
Spin Lock vs Mutex - medium Networking & Systems question
Context Switching and Thread Pinning - medium Networking & Systems question
MESI Protocol and False Sharing - hard Networking & Systems question
Zero-Copy Latency Impact - hard Networking & Systems question
Nagle's Algorithm Latency Impact - medium Networking & Systems question
PTP vs NTP Precision - medium Networking & Systems question
FPGA vs CPU Order Processing - medium Networking & Systems question
Multicast vs. Unicast Market Data - medium Networking & Systems question
DPDK Latency Reduction - hard Networking & Systems question
TCP vs UDP for Market Data - easy Networking & Systems question
Swaption Pricing Model - hard Algorithms & Data Structures question
Cross-Currency Swap Features - hard Financial Instruments question
TIPS Principal Adjustment - medium Algorithms & Data Structures question
Callable Bond Convexity - hard Algorithms & Data Structures question
Convertible Bond Embedded Option - hard Algorithms & Data Structures question
Repo Rate and Financing - medium Algorithms & Data Structures question
Immunization with Duration Matching - medium Algorithms & Data Structures question
Bootstrapping a Yield Curve - hard Algorithms & Data Structures question
Z-Spread vs OAS on Callable Bonds - hard Algorithms & Data Structures question
Credit Default Swap Trigger Event - medium Algorithms & Data Structures question
OIS-SOFR Spread Interpretation - medium Algorithms & Data Structures question
Swap Rate vs. Par Rate - medium Algorithms & Data Structures question
Key Rate Duration vs. Effective Duration - hard Algorithms & Data Structures question
DV01 Calculation - medium Algorithms & Data Structures question
Bond Price Change Approximation - medium Algorithms & Data Structures question
Decimal Precision in Trading - easy Code Analysis question

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Essential C++ challenges for high-frequency trading systems and low-latency infrastructure.

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