Scale Engineer

Software Engineer

Software EngineerL1Medium

This interview process is for a Software Engineer (L1) role at Citadel. It is designed to assess foundational technical skills, problem-solving abilities, and cultural fit.

Rounds·2

Timeline·~7d

Experience·0 - 2 yrs

Comp band·US$75000 - US$95000

Interview time·75 min

Evaluation

What they measure.

  • Problem-solving approach
  • Code quality and efficiency
  • Understanding of fundamental data structures and algorithms
  • Ability to articulate thought process

Preparation

How to prepare.

Tips

  1. Review fundamental computer science concepts (data structures, algorithms, operating systems, databases).
  2. Practice coding problems on platforms like LeetCode, HackerRank, or similar.
  3. Understand object-oriented programming principles.
  4. Prepare to discuss your past projects and technical experiences in detail.
  5. Research Citadel's mission, values, and recent work.
  6. Practice behavioral questions using the STAR method (Situation, Task, Action, Result).

Study plan

Fig · Study plan — 04 phases

01 / 04
01

Phase 01 of 04

Data Structures and Algorithms

Weeks 1-2: Data Structures & Algorithms fundamentals. Practice implementations and complexity analysis.

Weeks 1-2: Focus on core data structures (arrays, linked lists, stacks, queues, trees, graphs, hash tables) and their common algorithms (sorting, searching, traversal). Practice implementing these from scratch and analyze their time and space complexity.

Questions

Commonly asked.

  • Write a function to reverse a linked list.
  • Explain the difference between a process and a thread.
  • What is Big O notation and why is it important?
  • Describe a time you had to debug a complex issue.
  • How would you design a URL shortener?
  • Tell me about a project you are proud of.
  • What are your strengths and weaknesses?

Locations

Regional differences.

Fig · Regions — 02 locations

01 / 02

Location

New York

Interview focus

Adaptability to local work cultureCommunication skills in the local language (if applicable)Understanding of local market trends

Common questions

  • Tell me about a challenging project you worked on.
  • How do you handle tight deadlines?
  • Describe a time you disagreed with a teammate.

Tips

  • Research Citadel's presence and projects in this specific region.
  • Be prepared to discuss your understanding of the local tech ecosystem.
  • Highlight any experience working in diverse or international teams.

Rounds

Round-by-round.

Expand a step for evaluation criteria, sample questions, and prep notes.

Med

Technical Interview (Coding) · 45 min · Software Engineer

This round focuses on your core technical abilities. You will be asked to solve coding problems, typically involving data structures and algorithms. The interviewer will assess your problem-solving approach, your ability to write correct and efficient code, and how well you can explain your thought process.

What they look for

Clear and logical thinkingAbility to write clean, efficient codeUnderstanding of time and space complexityEffective communication of solutions

Evaluation

  • Problem-solving skills
  • Coding proficiency
  • Understanding of data structures and algorithms
  • Communication of approach

Sample questions

  • Given an array of integers, return indices of the two numbers such that they add up to a specific target.

    ArrayHash TableTwo Pointers

  • Implement a queue using two stacks.

    StackQueueData Structures

  • Find the kth smallest element in a binary search tree.

    TreeBinary Search TreeRecursion

Prep for this round

  1. 01Practice coding problems extensively.
  2. 02Be prepared to explain your code line by line.
  3. 03Think out loud and communicate your strategy before coding.
  4. 04Consider edge cases and test your code mentally.

Common rejection reasons

  • ×Inability to articulate thought process
  • ×Poor understanding of fundamental algorithms
  • ×Code with significant bugs or inefficiencies

DSA

Coding questions at Citadel.

Frequently reported on Citadel loops

View all at Citadel

Other guides

More at Citadel.