Senior Software Engineer

Job Description
About the Role
Citadel Securities is seeking a Senior Software Engineer to design and build critical data platforms in a high-performance, time-sensitive environment. This is a hands-on engineering role with a strong emphasis on development, paired with end-to-end ownership of the systems you create in production.
You will work closely with senior business and operational stakeholders to translate urgent, real-world data needs into scalable, reliable, and production-grade software.
What You'll Do
Core Responsibilities (Development-Focused)

• Design, build, and maintain high-performance data services and platforms with a focus on correctness, scalability, and efficiency
• Develop Python-based services, libraries, and tooling to support data delivery and operational workflows
• Architect systems that interact with large-scale databases and distributed data stores
• Collaborate with engineering teams to improve system architecture, deployment strategies, and production readiness
• Own systems end-to-end, from initial design through deployment and ongoing production support

Reliability & Operations (SRE-Oriented)

• Ensure the reliability and availability of production systems through monitoring, alerting, and incident response
• Participate in incident management and rapid-response troubleshooting
• Improve system resilience through automation, observability, and operational tooling
• Support Linux-based environments, containerized services, and networking infrastructure

What We're Looking For
Technical Skills

• Strong software engineering experience with deep expertise in Python
• Extensive experience working with databases and data-intensive systems
• Deep understanding of Linux systems and production environments
• Experience with Kubernetes, containerization, and service networking (e.g., NGINX, load balancing)
• Familiarity with SRE best practices, including monitoring, alerting, on-call support, and post-incident analysis

Experience & Attributes

• 10+ years of experience building and operating production systems
• Proven ability to perform under pressure and deliver in time-critical situations
• Experience working directly with senior stakeholders and business leaders
• Strong sense of ownership with the ability to drive ambiguous problems to completion
• Clear and effective communicator, especially during high-stakes or time-sensitive situations

Why Join Us
This role offers the opportunity to build impactful, business-critical systems while maintaining full ownership of their performance in production. You'll operate in an environment that values execution, precision, and reliability-where your work has immediate and visible impact.
In accordance with applicable law, the base salary range for this role is $150,000 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 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 .