Citadel · Hedge fund · New York, Hong Kong, London, Singapore · Mid-level · Posted 2026-06-24

Job Description

At Citadel, a leading investor in the world’s financial markets, we aim to win together as one team to earn the long-term trust of our capital partners and each other. Our collaborative approach allows technologists to grow alongside other team members and execute on big, innovative ideas.

Site Reliability Engineers (SREs) combine software and systems engineering expertise to build and operate the systems that power the firm’s investment strategies at the speed and scale required in fast-evolving markets. SREs are responsible for reducing complexity and improving performance in all corners of Citadel, providing early support for applications in development and ensuring crisp functioning of applications in production.

Members of the Citadel SRE team have software development backgrounds and varied experience across production engineering, software quality metrics, chaos engineering, networking, UNIX internals, cloud application architecture, and much more. A Citadel SRE’s work includes automation, instrumentation, optimization, incident response, and consultative support for other engineering teams. Crucially, Citadel SREs are commercial thinkers who partner closely with investment teams and enterprise functional teams to develop deep understanding of how applications work and to promote the SRE mindset, helping to build applications for stability and resiliency from their first stages.

When you join our team, you will be part of a cohesive group of engineers and investment professionals who are partnering to build world class tools and systems. If you have a mind for innovation and automation and enjoy using measurements and statistics to drive constant improvement, we are eager to hear from you.

YOUR OPPORTUNITY:

Understand the end-to-end flow across applications at a business level
Ensure the reliability, availability, and performance of applications in production
Own the automation of repetitive tasks and resolution of systematic issues
Investigate new ways to improve operations and define new solutions to solve technically complex systems issues
Identify and deliver green-field engineering solutions for issues based on root cause analyses
Own incident management and drive tactical and strategic solutions
Lead by evangelizing the SRE mindset to other teams
Learn from industry leaders, distinguished engineers and investment professionals

YOUR SKILLS & TALENTS:

Minimum of a Bachelor’s degree in Computer Science, or a related STEM discipline, or equivalent experience
Strong background in computer science fundamentals, data structures, algorithms, distributed systems
Fully proficient in at least one modern structured programming language (Python preferred)
Comfortable with a range of current software development tools and practices (testing, source control, build systems, CI/CD, etc.)
SQL and database experience is a strong plus
Web UI experience (JavaScript, CSS, React) is a plus
Excellent written and verbal communication skills and a passion for solving problems
Strong entrepreneurial spirit and the ability to adapt to changing requirements and technologies
A passion for learning and inventing novel approaches to hard problems

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.

In accordance with applicable law, the base salary range for this role is $105,000 to $300,000.

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

Citadel is one of the world’s leading alternative investment managers. We manage capital on behalf of many of the world’s preeminent private, public and nonprofit institutions. We seek the highest and best use of investor capital in order to deliver market leading results and contribute to broader economic growth. For over 30 years, Citadel has cultivated a culture of learning and collaboration among some of the most talented and accomplished investment professionals, researchers and engineers in the world. Our colleagues are empowered to test their ideas and develop commercial solutions that accelerate their growth and drive real impact.