
About this role
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, please share your details and we will contact you if there is a vacancy available.
Researchers build and deploy models across equities, options, fixed income, and derivatives domains, often working with petabyte-scale data.
Models incorporate advanced techniques: deep learning, sequence / time-series models, representation learning, and methods to tame overfitting and ensure robustness in financial regimes.
The goal: each model isn’t a theoretical exercise — it has a measurable P&L impact (or reduces risk / cost) when deployed in live market-making or trading contexts.
Key Responsibilities:
• Conduct cutting-edge research and development in machine learning, with a focus on large language models (LLMs) and Deep learning and their applications in quantitative finance.
• Design, implement, and optimize machine learning models for performance and scalability, particularly in financial contexts.
• Collaborate with cross-functional teams to integrate ML solutions into business processes and trading strategies.
Skillset Requirements:
Proficiency in creating and using algorithms to meticulously investigate and work through large data or error-checking problems
Deep knowledge of LLM architectures, including transformers.
Familiarity with attention mechanisms, normalization techniques, and model architecture design.
Training techniques (pre-training, fine-tuning, RLHF), and optimization methods.
Understanding of low-level details like GPU memory management, precision types (float16, bfloat16), and parallelization techniques.
Proficiency in advanced training techniques such as pre-training, fine-tuning, RLHF, and DPO.
Expertise in Python and ML frameworks like PyTorch or TensorFlow.
Familiarity with Retrieval Augmented Generation (RAG) systems and their implementation.
Proven ability to approach open-ended problems and design end-to-end solutions in ML/AI.
Strong mathematical and statistical foundations, particularly in areas relevant to quantitative finance.
More roles at Citadel Securities
- Cloud Platform Engineer — Miami · Dev · Entry Lvl
- Quantitative Researcher – PhD Intern (US) — Miami · Quant · Intern
- Crypto Quant Researcher — Hong Kong · Quant · Entry Lvl
- Software Engineer – Intern (Asia) — Hong Kong · Dev · Intern
- Software Engineer – Intern (Europe) — London · Dev · Intern
- Quantitative Trader – University Graduate (US – New York) — New York · Quant · New Grad