Exercise your creativity and build sophisticated technology


Develop and deliver custom solutions that power one of the world’s leading market makers.

Every day, the markets present exciting and meaningful challenges.

The markets move quickly and so does our business. Our engineers build the systems and tools that power our business to operate in real time. They also create market-leading experiences for our clients and partners so markets function efficiently.

Our engineers work in small teams to turn the best ideas into high-performing and resilient technology. With short development cycles, work rapidly goes into production.

As an engineer, you can create systems architectures, develop platforms and build web frameworks. You’ll have access to state-of-the-art tools and apply innovative techniques including distributed computing, natural language processing, machine learning and more.

Starting on a dedicated team, you can learn the business quickly and build relationships with colleagues who will invest in your success and help you grow. We work with you to find the role that best fits your strengths.

Software Engineer

Design, develop, test and deploy elegant software solutions that optimize performance and efficiency.

Quantitative Developer

Partner with Quantitative Researchers to create and implement trading system software solutions that leverage cutting-edge statistical techniques and technologies.

User Interface Engineer

Leverage advanced JavaScript knowledge and visualization skills to build scalable and performant web applications.

Growth and development

We make bold investments in extraordinary people and provide the tools and resources you need to take ownership of your work and career.

We are committed to helping new graduates build meaningful engineering careers on an accelerated learning curve. Many engineers who joined us right out of school have gone on to develop some of our most valuable technology and lead our most successful teams. Are you next?

From day one, you will have the opportunity to learn the industry and gain skills to grow as an engineer and as a leader.


Learn the fundamentals of capital markets, statistics and investments. Become fluent in the languages of finance and financial technology.


Receive intermediate and advanced skill-boosters for Python and C++ and hands-on training in Clean Code that will help you navigate the firm’s advanced internal systems and custom tools.


Benefit from practical instruction and guidance on leading teams, managing projects and communicating with colleagues.

Frequently asked questions

We interview top engineering talent around the world. These are some of their frequently asked questions, answered by engineers here at Citadel Securities.

What are the skills and traits that make someone a successful engineer?

Confidence and a commercial mindset: Being able to operate confidently in a fast, dynamic environment is necessary. You should feel comfortable making decisions, assessing risk and trusting your intuition as you design systems.

Quick learning and comfort with ambiguity: You must possess the ability to learn quickly and be comfortable operating in unfamiliar situations. You are building solutions for problems we identify in real time. There is often no playbook, so constant learning and adaptability are key. We want candidates who are excited by the fact that it is often those moments with the least definition that yield the most innovation.

Problem solving and ownership: You will face challenging, exciting and sometimes ambiguous problems. Being a motivated problem solver is critical. You’ll be able to tap into the best tools and resources available, including bright teammates who want to see you succeed.

We encourage initiative. People who take responsibility and accountability for projects grow the fastest.

Technical proficiency: Excellence is our baseline—you need to be an amazing engineer. But you don’t need to be an expert in many specific program languages on day one; we’ll teach you. We want talented engineers who want to learn, master new skills and continue to raise the bar together.

What are some of the reasons a software engineer would want to work at Citadel Securities?

Rapid production cycle: It may take months to see your work come to fruition at a tech organization, but with us, our engineers have more ownership over their work and can quickly see its impact. Our teams thrive with the ability to innovate and execute, constantly pursuing new, better ways of working.

Learning opportunities: We work with brilliant teammates at a scale where the opportunity to collaborate, including with senior leaders, is unrivaled. Learning and growth are an everyday experience, rather than one-off training sessions. Everyone you work with is extremely smart, driven and focused on achieving results. We focus on hiring extraordinary people, without compromise. This means you’re working with and learning from only the best. By contrast, in the tech industry, it’s hard to keep the bar as consistently high when you’re at the scale of many of the big tech companies.

Innovation: One of the best aspects of our approach is that you’re hardly ever given a document that says, “Here’s what you should build.” Instead, we partner with traders to understand the problems we need to solve. Our engineers get to ask questions, clarify the problem with them and then build a technical solution that’s stronger because they understand the business problem they are solving.

Practically speaking, we sit with the business to understand their needs and work with quant researchers to spec out systematic and semi-systematic trading algorithms. We then build out these trading engines from the ground up.

Our work equips teams within the organization and helps Citadel Securities meet the needs of clients and counterparties like retail brokers and banks. It’s exciting to be part of a team that drives benefits for retail and institutional investors around the world and global financial markets overall.

Engineers wear a variety of hats depending on their team or specialty. All software engineers play important roles in driving the firm’s performance.

Our process is simple: we start with a goal and build technology to achieve it. For example:

  • Building products that connect to exchanges to support a variety of trading approaches
  • Developing systems to help to consume and assign meaning to market data in real time
  • Creating tools that help prepare for market events and model the impact of specific scenarios
  • Building trading engines that connect buyers and sellers, allowing them to send orders and receive executions. This keeps markets free flowing for all participants.

Our work drives proactive, big ideas that have an outsized impact. The opportunity to convert thoughtful ideas from theory into real-world applications is both challenging and exciting.

For example, we recently proposed a framework that could turn our research models into high-performance, production-ready components. The management team empowered us to deliver on this solution in a fully dedicated fashion for a year, delivering significant impact to the firm’s bottom line.

Technology is at the very heart of what we do.

Engineers at Citadel Securities are true partners with the business, not a support function. We eliminate the middlemen to drive collaboration, innovation and creativity. From the top of the organization down, engineering is appreciated as the lifeblood of the firm.


  • BS/MS in Computer Science, Electrical Engineering, Engineering, Statistics, Mathematics, Physics or similar majors
  • Previous internship at a tech or finance company; or research experience
  • Exceptional programming and design skills
  • Strong analytical skills and familiarity with probability and statistics
  • Ability to communicate effectively in a collaborative, complex and highly technical team environment
  • Intellectual curiosity and passion for solving challenging problems using technology
  • Motivation and desire to learn

Ready to apply?

Apply Now

Interested in other role types?

Quantitative Research

Markets & Trading