# Quantitative Researcher Engineer – PhD Intern (Europe) [Citadel Securities](https://www.jorb.ai/firms/citadel-securities.md) · London · United Kingdom · [Backend](https://www.jorb.ai/jobs/backend.md) Citadel Securities is hiring a Quantitative Researcher Engineer – PhD Intern (Europe) in London. Posted 2026-05-29; applications close 2026-07-28. **Apply**: https://www.citadelsecurities.com/careers/details/quantitative-researcher-engineer-phd-intern-europe/ Posted 1d ago. ## 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. ## Applying to this role 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. [Tailor this application](https://www.jorb.ai/signup?ref=job-atom&firm=citadel-securities&job=6a198039471c722e4024ddaf) ## More open roles at Citadel Securities - [Fixed Income Sales, Senior Analyst](https://www.jorb.ai/jobs/6a198039471c722e4024ddb3.md) – London, posted 1d ago - [Quantitative Researcher – PhD Intern (Europe)](https://www.jorb.ai/jobs/6a198039471c722e4024ddb9.md) – London, posted 1d ago - [Quantitative Research Analyst Intern – BS/MS (Asia)](https://www.jorb.ai/jobs/6a198039471c722e4024ddcc.md) – Hong Kong, posted 1d ago - [Quantitative Researcher – PhD Intern (Asia)](https://www.jorb.ai/jobs/6a198039471c722e4024ddcd.md) – Hong Kong, posted 1d ago - [Machine Learning Researcher – PhD Intern (US)](https://www.jorb.ai/jobs/6a198039471c722e4024ddd9.md) – New York, posted 1d ago ## Other open Backend roles - [Smart Contract Auditor](https://www.jorb.ai/jobs/69558686755b78493f7d0ea8.md) at [Binance](https://www.jorb.ai/firms/binance.md) – Hong Kong, posted 4mo ago - [Pioneer Talent Program - AI Engineer, Dev Tools](https://www.jorb.ai/jobs/69e5f1b05c7784e05a1dd11c.md) at [Binance](https://www.jorb.ai/firms/binance.md) – Hong Kong, posted 1mo ago - [Microsoft D365 Developer - Senior - Consulting - Location OPEN](https://www.jorb.ai/jobs/6a1712ebf3083ad8f9c5972b.md) at [EY](https://www.jorb.ai/firms/ey.md) – New York, posted 2d ago - [Binance Accelerator Program - AI Engineer, Dev Tools](https://www.jorb.ai/jobs/69e5f1b05c7784e05a1dd121.md) at [Binance](https://www.jorb.ai/firms/binance.md) – Hong Kong, posted 1mo ago - [Pioneer Talent Program - AI-powered Productivity Platform Engineer](https://www.jorb.ai/jobs/69e5f1b05c7784e05a1dd11d.md) at [Binance](https://www.jorb.ai/firms/binance.md) – Hong Kong, posted 1mo ago --- Updated: 2026-05-30 Canonical: https://www.jorb.ai/jobs/6a198039471c722e4024ddaf