Citadel Software Engineer Interview Questions

Citadel Summer 2026 SWE Internship Technical Phone Screen Experience

The first interview asked about merging k lists, but binary search can't be used because the space complexity needs to be O(k) instead of O(n). I just received my Superday offer after a month. Anyone

Just completed Citadel Launch HackerRank OA and passed all test cases what are my chances?

Hey everyone, I wanted to share my experience and get some honest feedback on my chances. Background: \-Sophomore at University of Waterloo (Electrical Engineering) \-CEGEP( preuniversity program in Q

citadel software engineer tech phone screen interview questions

几周前面的，东欧女，口音比较重。 以下内容需要积分高于 200 您已经可以浏览 write a counter, return how many times a key called so far; make it thread safe, compare options on one host, multiple apps call it, how to make it work 从第二个就开始答得不好，第三个完全不知道，问了下gpt，工作中没接触过相关东西；和我技术栈差别挺大，就当练习了。

Citadel Fulltime SDE Tech Phone Screen Interview Experience

Recruiter reach-out, 90 minutes, 3 questions, all coding. The following content requires a score higher than 150. You can already view it. The first question was Li Kou, exactly the same as Liu Siqi.

Citadel GQS QR First-Round Technical Phone Screen Interview

This post was last edited by Anonymous on 2025-10-10 17:21. The first round of interviews lasted 60 minutes. First, they copied my resume, which took a while because I didn't have a Coderpad link. The

Citadel Tech Phone Screen for Software Engineer Intern

The interview lasted 45 minutes. The interviewer seemed unfriendly, and I felt a lot of pressure. After scrutinizing my resume, they started asking technical questions. The first question was a simple

Citadel Securities C++ Engineer Online Assessment Experience

The task required refactoring and optimizing a convoluted C++ codebase within a 1.5-hour limit to prevent execution timeouts. The code relied heavily on obfuscation to conceal the actual logic, utiliz

Option Software Engineer C++ | Citadel Securities

First Coding Interview I was given a to reverse a given string. It was easy. void reverse(char begin, char end) { \t\t\t// to do function } void reverseString(std::string str) { \treverse(str.data(), str.data() + str.size()); } int main() { std::string str = "Reverse"...

What kind of performance do trading firms look for in their hiring process?

So I gave the online assessment for Explore HRT, which is a 2-3 day program by Hudson River Trading for sophomores to get a hands on experience into how HRT works and learn about the field. There were

I have no C++ or Python experience, why did I receive an interview from Citadel (internship)?

I have virtually zero C++, C, or Python experience or projects on my resume, and nothing low-level like what Citadel does. My resume is full of TypeScript, app dev, React, cloud, etc. I also did not g

Citadel Software Engineering Campus Assesment

A data processing pipeline consists of n services connected in a series where the output of the ith service serves as the input to the (i+ 1)th service. However, the...

Citadel | Senior Software Engineer | Reject

Hi, I had two coding rounds at Citadel. Round 1: I was asked one medium question: A list of currency relationships with exchange values. (BTC - USD) find the best exchange rate from currency1 to...

Citadel 2024 summer internship OA

Just finished OA but didn\'t pass all the test cases. Tho I finished doing this, still wanna know how to solve Q1... 1. Hacker\'s Team \tSimilar to https://leetcode.com/problems/longest-increasing-subsequence/ \tThe transformation is there are 2...

Visiting Cities Hackerrank 2023 OA - New Grad

Visiting Cities There are a number of cities in a row, and there are two bus lines that go between them. They both visit all cities in order, but one may take longer...

Citadel onsite but it's only one interview

Hi! I received a virtual onsite invite at Citadel after passing the first interview, and I've heard that onsites are always three rounds, but my onsite is only one 45-min round. (I also thought I bomb