• Process daily threat-feeds related to newly created malware and write detection rules for various technologies. • Investigate and resolve customer-related inquiries related to protection, performance, and usability. • Conduct research and threat hunting for the latest cybersecurity threats affecting our customers, including static and dynamic analysis of PE and other filetypes. • Provide feedback on new projects and tools related to your daily work, and suggest ideas on how to handle new threat types. • Support content creation efforts incl. threat descriptions, blogs, and presentations. • Investigate phishing and other web-based threats, and develop internal streams to collect new data. • Be a leader in the web protection space. • Utilize AI tools including LLM and machine learning to enhance and automate aspects of your workflow. • Respond to internal and external inquiries via a ticket management system, working on a 24/7/365 rotation to ensure full coverage.

• Your work sits directly at the intersection of AI research and scalable software engineering. You will define how natural, fast, and reliable our models perform in production. • Research & Train: Design, train, and evaluate our proprietary deep learning models. You will drive the development of new capabilities, such as emotion recognition, and integrate them into our core architecture. • High-Performance ML Systems: Optimize our models for maximum inference speed and efficiency, ensuring they can handle massive datasets and real-time workloads at scale. • Software Engineering: Write clean, production-ready code. We need researchers who are also strong software engineers, capable of translating complex research into highly available architectures. • MLOps & Tooling: Build and maintain the internal pipelines for data processing, model training, and evaluation to make our iteration cycles fast and reliable.

• Contribution to research into 5G/6G research projects (RAN related) • Design, validation of RAN related algorithms/architectures (e.g. RRM) • Development of simulations (or prototypes) related to 5G/6G • Responsibility for selected tasks in EU projects • Writing reports, papers, contributing to patents • Good command of Python or Matlab scripting is required • Knowledge of C/C++/Java will be a plus

Job Description Role Summary At Citadel Securities, a leading global market maker, our team of Quantitative Developers and Research Engineers partner with Quantitative Researchers to create and implement automated trading system software solutions that leverage sophisticated statistical techniques and technologies. Opportunities available in Miami, Chicago, London, New York, Hong Kong, Sydney, Singapore 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 solution Skills and Preferred Qualifications - A deep passion for technology, software development, and mathematics - Proficiency within one or more programming languages, including C++, Python, and R - Experience with some of the following areas: Distributed Computing, Natural Language Processing, Machine Learning, Platform Development, Networking, System Design, and/or Web Development - Exceptional quantitative and analytical skills - Bachelor's, Master's or PhD degree in Computer Science, Mathematics, Statistics, or equivalent experience - Strong written and verbal communications skills In accordance with applicable law, the base salary range for this role is $250,000 to $350,000. In addition, the employee who fills this role will be eligible to participate in a discretionary incentive compensation program, as well as a wide array of benefit programs, such as medical and life insurance, retirement and tax-free savings plans, and access to other healthcare programs. 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 .