Quantitative Researcher Engineer – PhD Intern (Europe)

Citadel Securities·London·United Kingdom·Backend

Citadel Securities is hiring a Quantitative Researcher Engineer – PhD Intern (Europe) in London. Posted 2026-05-29; applications close 2026-07-28 (in 59 days).

Role details

Overview

At Citadel Securities, 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.

Internship Overview

As an intern, you’ll challenge the impossible in research through an 11-week program that enables collaboration with senior team members. You’ll also have opportunities to network and socialize with peers throughout the internship. Our signature internship program runs from June through August, with some flexibility to accommodate 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 in areas such as 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 communication skills

Opportunities available in Zurich and London.

About Citadel Securities

Citadel Securities is a technology-driven, next-generation global market maker. We provide institutional and retail investors with world-class liquidity, competitive pricing, and seamless front-to-back execution across a broad array of financial products. Our teams of engineers, traders, and researchers harness leading-edge quantitative research and the power of compute, machine learning, and AI to power our analytics and tackle the market’s and our clients’ most critical challenges. We are shaping the future of capital markets. For more information, visit citadelsecurities.com.

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This Quantitative Researcher Engineer – PhD Intern (Europe) role at Citadel Securities runs through the firm's own careers portal and expects a CV and cover letter written specifically for the posting, not a portable submission carried across firms. Jorb AI's application agent tailors a CV and cover letter from your background to this posting and tracks the role alongside the rest of your applications.

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