Large

Citadel Securities is the next-generation capital markets firm. Our work is powered by the deepest integration of financial, mathematical and engineering expertise. Combining deep trading acumen with cutting-edge analytics and technology, we at Citadel Securities deliver critical liquidity to the world’s most important financial institutions—while helping shape the global markets of tomorrow.


Finance

Citadel Securities

You need a PhD in a quantitative field, strong knowledge of stats/probability, coding skills (Python/R/C++), and experience in data-driven research and independent projects. Excellent analytical and communication skills are essential.

You will develop and enhance valuation models, backtest trading strategies, analyze unconventional data, and refine monetization systems for trading signals in a live environment.

Data

Research & Development

Miami

<div>
 <div>
  <h2 class="jobSectionHeader"><b>Job Description</b></h2>
  <div>
   At Citadel Securities, a leading global market maker, our team of quantitative researchers models the markets and brings trading strategies to life every day. Specifically, this team develops and tests automated quant trading strategies using sophisticated statistical techniques. You’ll get to challenge the impossible in quantitative research by applying sophisticated and complex statistical techniques to financial markets, some of the most complex data sets in the world.
  </div>
  <div></div>
  <div>
   As an intern, you’ll get to challenge the impossible in research through an 11 week program that will allow you to collaborate and connect with senior team members. In addition, you’ll get the opportunity to network and socialize with peers throughout the internship.
  </div>
  <div></div>
  <div>
   <b>Your Objectives</b>
  </div>
  <ul>
   <li>Conceptualize valuation strategies, develop and continuously improve upon mathematical models, and help translate algorithms into code</li>
   <li>Back test and implement trading models and signals in a live trading environment</li>
   <li>Use unconventional data sources to drive innovation</li>
   <li>Conduct research and statistical analysis to build and refine monetization systems for trading signals</li>
  </ul>
  <div></div>
  <div>
   <b>Your Skills &amp; Talents</b>
  </div>
  <ul>
   <li>PhD degree in mathematics, statistics, physics, computer science, or another highly quantitative field</li>
   <li>Strong knowledge of probability and statistics (e.g., machine learning, time-series analysis, pattern recognition, NLP)</li>
   <li>Prior experience working in a data driven research environment</li>
  </ul>
  <ul>
   <li>Experience with translating mathematical models and algorithms into code (Python, R or C++)</li>
   <li>Independent research experience</li>
   <li>Ability to manage multiple tasks and thrive in a fast-paced team environment</li>
   <li>Excellent analytical skills, with strong attention to detail</li>
   <li>Strong written and verbal communication skills</li>
  </ul>
  <div></div>
  <div>
   Opportunities available in Miami, New York.
  </div>
  <p></p>
  <div>
   <i>In accordance with New York City’s Pay Transparency Law, the base salary range for this role is $4,325 to $5,750 per week. Base salary does not include other forms of compensation or benefits.</i>
  </div>
  <h2 class="jobSectionHeader"><b>About Citadel Securities</b></h2>
  <p>Citadel Securities is the next-generation capital markets firm and a leading global market maker. We provide institutional and retail investors with the liquidity they need to trade a broad array of equity and fixed income products in any market condition. The brightest minds in finance, science and technology use powerful, advanced analytics to solve the market’s most critical challenges, turning big ideas into real-world outcomes.</p>
 </div>
</div>
<div></div>


 
  Job Description
  
   At Citadel Securities, a leading global market maker, our team of quantitative researchers models the markets and brings trading strategies to life every day. Specifically, this team develops and tests automated quant trading strategies using sophisticated statistical techniques. You’ll get to challenge the impossible in quantitative research by applying sophisticated and complex statistical techniques to financial markets, some of the most complex data sets in the world.
  
  
  
   As an intern, you’ll get to challenge the impossible in research through an 11 week program that will allow you to collaborate and connect with senior team members. In addition, you’ll get the opportunity to network and socialize with peers throughout the internship.
  
  
  
   Your Objectives
  
  
   Conceptualize valuation strategies, develop and continuously improve upon mathematical models, and help translate algorithms into code
   Back test and implement trading models and signals in a live trading environment
   Use unconventional data sources to drive innovation
   Conduct research and statistical analysis to build and refine monetization systems for trading signals
  
  
  
   Your Skills & Talents
  
  
   PhD degree in mathematics, statistics, physics, computer science, or another highly quantitative field
   Strong knowledge of probability and statistics (e.g., machine learning, time-series analysis, pattern recognition, NLP)
   Prior experience working in a data driven research environment
  
  
   Experience with translating mathematical models and algorithms into code (Python, R or C++)
   Independent research experience
   Ability to manage multiple tasks and thrive in a fast-paced team environment
   Excellent analytical skills, with strong attention to detail
   Strong written and verbal communication skills
  
  
  
   Opportunities available in Miami, New York.
  
  
  
   In accordance with New York City’s Pay Transparency Law, the base salary range for this role is $4,325 to $5,750 per week. Base salary does not include other forms of compensation or benefits.
  
  About Citadel Securities
  Citadel Securities is the next-generation capital markets firm and a leading global market maker. We provide institutional and retail investors with the liquidity they need to trade a broad array of equity and fixed income products in any market condition. The brightest minds in finance, science and technology use powerful, advanced analytics to solve the market’s most critical challenges, turning big ideas into real-world outcomes.
 



Quantitative Researcher – 2025 PhD Intern - Citadel Securities

Quantitative Researcher – 2025 PhD Intern

You should have a degree in Computer Science or related field, strong programming and analytical skills, and the ability to communicate effectively in a complex, collaborative environment.

You will develop trading tools, create high-performance data platforms, and collaborate in small teams to innovate finance technology.

Software Engineering

London

<div>
 <div>
  <h2 class="jobSectionHeader"><b>Job Description</b></h2>
  <div>
   At Citadel Securities, our engineers work in small teams to turn the best ideas into high-performing and resilient technology. With short development cycles, work rapidly goes into production. As an engineer, you can create systems architectures, develop platforms and build web frameworks. You’ll have access to state-of-the-art tools and apply innovative techniques including distributed computing, natural language processing, machine learning and more.
  </div>
  <div></div>
  <div>
   As an intern, you’ll get to challenge the impossible in technology through an 11 week program that will allow you to collaborate and connect with senior team members. In addition, you’ll get the opportunity to network and socialize with peers throughout the internship.
  </div>
  <div></div>
  <div>
   <b>Your Objectives:</b>
  </div>
  <ul>
   <li>Create technological tools that bring trading strategies to life</li>
   <li>Develop high-performance, large data research platforms</li>
   <li>Work in small teams to build the future of finance</li>
  </ul>
  <div></div>
  <div>
   <b>Your Skills &amp; Talents:</b>
  </div>
  <ul>
   <li>Degree in Computer Science, Computer Engineering or related fields (Bachelor’s, Master’s, PhD)</li>
   <li>Exceptional programming and design skills</li>
   <li>Strong analytical skills and familiarity with probability and statistics</li>
   <li>Ability to communicate effectively in a collaborative, complex and highly technical team environment</li>
   <li>Intellectual curiosity and passion for solving challenging problems using technology</li>
  </ul>
  <div></div>
  <div>
   Opportunities available in London.
  </div>
  <h2 class="jobSectionHeader"><b>About Citadel Securities</b></h2>
  <p>Citadel Securities is the next-generation capital markets firm and a leading global market maker. We provide institutional and retail investors with the liquidity they need to trade a broad array of equity and fixed income products in any market condition. The brightest minds in finance, science and technology use powerful, advanced analytics to solve the market’s most critical challenges, turning big ideas into real-world outcomes.</p>
 </div>
</div>
<div></div>


 
  Job Description
  
   At Citadel Securities, our engineers work in small teams to turn the best ideas into high-performing and resilient technology. With short development cycles, work rapidly goes into production. As an engineer, you can create systems architectures, develop platforms and build web frameworks. You’ll have access to state-of-the-art tools and apply innovative techniques including distributed computing, natural language processing, machine learning and more.
  
  
  
   As an intern, you’ll get to challenge the impossible in technology through an 11 week program that will allow you to collaborate and connect with senior team members. In addition, you’ll get the opportunity to network and socialize with peers throughout the internship.
  
  
  
   Your Objectives:
  
  
   Create technological tools that bring trading strategies to life
   Develop high-performance, large data research platforms
   Work in small teams to build the future of finance
  
  
  
   Your Skills & Talents:
  
  
   Degree in Computer Science, Computer Engineering or related fields (Bachelor’s, Master’s, PhD)
   Exceptional programming and design skills
   Strong analytical skills and familiarity with probability and statistics
   Ability to communicate effectively in a collaborative, complex and highly technical team environment
   Intellectual curiosity and passion for solving challenging problems using technology
  
  
  
   Opportunities available in London.
  
  About Citadel Securities
  Citadel Securities is the next-generation capital markets firm and a leading global market maker. We provide institutional and retail investors with the liquidity they need to trade a broad array of equity and fixed income products in any market condition. The brightest minds in finance, science and technology use powerful, advanced analytics to solve the market’s most critical challenges, turning big ideas into real-world outcomes.
 



Software Engineer – 2025 Intern - Citadel Securities

Software Engineer – 2025 Intern

You need a PhD in a quantitative field, strong research in machine learning/statistics, programming skills (Python/C++), problem-solving ability, and clear communication of complex concepts.

You will extract patterns using machine learning, implement algorithms, work with large data sets, back-test models, and document your research findings.

<div>
 <div>
  <h2 class="jobSectionHeader"><b>Job Description</b></h2>
  <div>
   At Citadel Securities, a leading global market maker, our team of quantitative researchers models the markets and brings trading strategies to life every day. Specifically, the goal of this team is to leverage and tailor the state-of-the-art machine learning and AI algorithms to modernize the quantitative trading industry. We’re looking for extraordinary and highly motivated researchers who are excited about solving challenging problems and iterating in a fast-paced environment.
  </div>
  <div></div>
  <div>
   As an intern, you’ll get to challenge the impossible in research through an 11 week program that will allow you to collaborate and connect with senior team members. In addition, you’ll get the opportunity to network and socialize with peers throughout the internship.
  </div>
  <div></div>
  <div>
   Your Objectives
  </div>
  <ul>
   <li>Use statistics, machine learning or AI (e.g. deep learning, NLP) to extract patterns from various kinds of datasets through innovative and rigorous research</li>
   <li>Implement algorithms in high-quality code</li>
   <li>Work with large data sets, including unconventional and unstructured data sources</li>
   <li>Back-test models and document research findings</li>
  </ul>
  <div></div>
  <div>
   Your Skills &amp; Talents
  </div>
  <ul>
   <li>PhD degree in mathematics, statistics, physics, computer science, or another highly quantitative field</li>
   <li>Advanced training and strong research track record in statistics, machine learning, AI, or another highly quantitative field</li>
  </ul>
  <ul>
   <li>Hands on programming experience in scripting (e.g. Python) and/or compiled languages (e.g. C++)</li>
   <li>A background demonstrating strong problem-solving skills</li>
   <li>An ability to communicate advanced concepts in a concise and logical way</li>
   <li>Proficiency in creating and using algorithms to meticulously investigate and work through large data or error-checking problems</li>
  </ul>
  <div></div>
  <div>
   Opportunities available in Miami
  </div>
  <h2 class="jobSectionHeader"><b>About Citadel Securities</b></h2>
  <p>Citadel Securities is the next-generation capital markets firm and a leading global market maker. We provide institutional and retail investors with the liquidity they need to trade a broad array of equity and fixed income products in any market condition. The brightest minds in finance, science and technology use powerful, advanced analytics to solve the market’s most critical challenges, turning big ideas into real-world outcomes.</p>
 </div>
</div>
<div></div>


 
  Job Description
  
   At Citadel Securities, a leading global market maker, our team of quantitative researchers models the markets and brings trading strategies to life every day. Specifically, the goal of this team is to leverage and tailor the state-of-the-art machine learning and AI algorithms to modernize the quantitative trading industry. We’re looking for extraordinary and highly motivated researchers who are excited about solving challenging problems and iterating in a fast-paced environment.
  
  
  
   As an intern, you’ll get to challenge the impossible in research through an 11 week program that will allow you to collaborate and connect with senior team members. In addition, you’ll get the opportunity to network and socialize with peers throughout the internship.
  
  
  
   Your Objectives
  
  
   Use statistics, machine learning or AI (e.g. deep learning, NLP) to extract patterns from various kinds of datasets through innovative and rigorous research
   Implement algorithms in high-quality code
   Work with large data sets, including unconventional and unstructured data sources
   Back-test models and document research findings
  
  
  
   Your Skills & Talents
  
  
   PhD degree in mathematics, statistics, physics, computer science, or another highly quantitative field
   Advanced training and strong research track record in statistics, machine learning, AI, or another highly quantitative field
  
  
   Hands on programming experience in scripting (e.g. Python) and/or compiled languages (e.g. C++)
   A background demonstrating strong problem-solving skills
   An ability to communicate advanced concepts in a concise and logical way
   Proficiency in creating and using algorithms to meticulously investigate and work through large data or error-checking problems
  
  
  
   Opportunities available in Miami
  
  About Citadel Securities
  Citadel Securities is the next-generation capital markets firm and a leading global market maker. We provide institutional and retail investors with the liquidity they need to trade a broad array of equity and fixed income products in any market condition. The brightest minds in finance, science and technology use powerful, advanced analytics to solve the market’s most critical challenges, turning big ideas into real-world outcomes.
 



Citadel Securities

navigation.mission