Job Description

At Citadel, Quantitative Research Engineers work closely with Quantitative Researchers to develop and implement automated trading system software solutions. These solutions utilize advanced statistical and quantitative techniques to tackle complex financial challenges. We seek candidates with a proven track record of excellence in their field and a strong desire to apply their advanced software engineering skills to systematic investing.

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.

Our signature internship program takes place June through August. Occasionally, we can be flexible to other times of the year. You will be able to indicate your timing preference in the application.

Your Objectives

• Design, develop, test, and deploy elegant software solutions for automated trading systems
• Partner with the Quantitative Research team to define priorities and deliver custom software solutions

Your Skills & Talents

• PhD degree in computer science, mathematics, statistics, physics, or another highly quantitative field
• Strong programming skills with proficiency in one or more programming languages, including C++, Python, and R
• A deep passion for technology, software development, and mathematics
• Strong computer science fundamentals and software development experience
• Experience with some of the following areas: Distributed Computing, Natural Language Processing, Machine Learning, Platform Development, Networking, System Design, and/or Web Development
• Proven track record of creatively solving problems by understanding and prioritizing business value and applying technology solutions
• Strong written and verbal communications skills

Opportunities available in New York, Miami, Greenwich, and Houston.

In accordance with applicable law, the base salary range for this role is $4,500 to $5,800 per week.

About Citadel

Citadel is one of the world's leading alternative investment managers. We manage capital on behalf of many of the world's preeminent private, public and nonprofit institutions. We seek the highest and best use of investor capital in order to deliver market leading results and contribute to broader economic growth. For over 30 years, Citadel has cultivated a culture of learning and collaboration among some of the most talented and accomplished investment professionals, researchers and engineers in the world. Our colleagues are empowered to test their ideas and develop commercial solutions that accelerate their growth and drive real impact.

For over 35 years, we’ve been helping the world’s preeminent institutions identify the highest and best uses of capital. Our innovative investment strategies and market-leading technology, backed by a global network of elite quantitative researchers, provide exceptional risk-adjusted returns that help our partners succeed.

With more than $67 billion in investment capital as of early 2026, Citadel is the world’s most successful hedge fund manager by net gains since inception. We operate at the intersection of finance and technology to capture undiscovered opportunities across global markets.

Citadel does business in every major financial hub, principally operating through five primary investment strategies—Equities, Fixed Income & Macro, Commodities, Credit & Convertibles, and Global Quantitative Strategies—and provides essential liquidity to the broader economy through its market-making affiliate, Citadel Securities.