Quantitative Researcher - PhD Intern (Europe)

InternHunt; Greater London; Hybrid; GBP 28,000 - 35,000; Full time

Job summary

Citadel Securities in London invites applications for a PhD Intern in Quantitative Research. The program runs for 11 weeks, focusing on developing and testing automated quant trading strategies using advanced statistical techniques.

You will conceptualize valuation models, backtest signals, and explore unconventional data sources to drive innovation. Collaboration with senior team members and networking with peers are key features of the internship.

Qualifications

• PhD in a highly quantitative field such as mathematics, statistics, physics, or CS.
• Strong knowledge of probability and statistics, including ML, time-series, pattern recognition, NLP.
• Experience translating models into executable code and backtesting in live environments.

Responsibilities

• Conceptualize valuation strategies, develop mathematical models, and translate algorithms into code.
• Back test and implement trading models and signals in a live trading environment.
• Use unconventional data sources to drive innovation in research.
• Conduct research and statistical analysis to build monetization systems for trading signals.

Skills

PhD in quantitative field

Probability & statistics

Data-driven research

Python / R / C++ coding

Multitasking

Analytical skills

Communication skills

Education

PhD in mathematics / statistics / physics / CS

Tools

Python

R

C++

Job description

Quantitative Researcher - PhD Intern (Europe)

London, United Kingdom

2026-10-03

Role 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 dive into 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

• 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++)
• 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 may be available from time to time in any location in which the business is based for suitable candidates. If you are interested in a career with Citadel Securities, please share your details and we will contact you if there is a vacancy available.

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 in a broad array of financial products. Our teams of engineers, traders and researchers harness leading-edge quantitative research and the accelerating power of compute, machine learning and AI to power our analytics and tackle the market’s and our clients’ most critical challenges. Together, we are forging the future of capital markets. For more information, visit citadelsecurities.com.

Citadel is an equal opportunity employer. The company prohibits discrimination in employment and advancement opportunities on the basis of race, religious creed, color, national origin, citizenship status, ancestry, disability, medical condition, genetic information, marital status, sex, gender, gender identity, gender expression, age, sexual orientation, or military or veteran status, or any other legally protected status or characteristic under applicable federal, state, provincial, or local law. It also prohibits unlawful discrimination based on the perception that anyone has any of those characteristics, or is associated with a person who has or is perceived as having any of those characteristics.

For Massachusetts applicants: it is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.