Citadel System Design Interview Questions

Practice the exact questions companies are asking right now.

8 Questions 1 Company07.12.2026
Showing 8 results
Role
Citadel logo
Citadel
Medium
Software EngineerSenior+

Design a Low-Latency Metrics and Alerting Platform

Design a Low-Latency Metrics and Alerting Platform Design a multi-tenant platform that collects host and application metrics, stores time-series data,...

System Design
33
0
343 people solved
Jul 12, 2026
Citadel logo
Citadel
Medium
Software Engineer

Design Inventory Availability and Order Placement

Design Inventory Availability and Order Placement Design the inventory portion of an e-commerce system with two core operations: 1. Query the currentl...

System Design
18
0
143 people solved
Apr 6, 2026
Citadel logo
Citadel
Medium
Software EngineerIntern

Design alerting for application-to-exchange mappings

Problem: Alerting design for application→exchange mappings You are building a service that receives an ordered stream of mapping events: - register(ap...

System Design
29
0
528 people solved
Feb 11, 2026
Citadel logo
Citadel
Easy
Software Engineer Locked

Design stock price time-series store and query

This question evaluates system design skills for time-series data storage and querying, covering scalability, partitioning, indexing, event-time handl...

System Design
40
0
314 people solved
Jan 22, 2026
Citadel logo
Citadel
Hard
Software Engineer

Design a low-latency trading system

System Design: Low-Latency Electronic Trading Platform (Equities) You are designing a single-region electronic trading platform (exchange/ATS-like) th...

System Design
104
0
1090 people solved
Aug 9, 2025
Citadel logo
Citadel
Hard
Software EngineerSenior+ Locked

Design a low-latency trading platform

This question evaluates a candidate's ability to design a low-latency, real-time trading system, covering competencies in distributed systems, streami...

System Design
21
0
186 people solved
Jan 26, 2026
Citadel logo
Citadel
Medium
Site Reliability Engineer

Design Safe Configuration and Deployment for Hundreds of Services

Design Safe Configuration and Deployment for Hundreds of Services Replace hand-edited files, environment variables, NFS, and SSH scripts for 200-plus ...

System Design
0
0
3 people solved
May 8, 2026
Citadel logo
Citadel
Hard
Software Engineer

Discuss queues, NoSQL, and concurrency

System Design Concepts: Messaging, Storage Choices, and Concurrency Context: You are designing distributed services that communicate via events and mu...

System Design
20
0
161 people solved
Sep 6, 2025

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