Senior Network Engineer

Role Overview

As a Senior Network Engineer, you will play a critical role in designing, implementing, and maintaining our complex network infrastructure to ensure low-latency, high-performance trading systems. Your expertise will be instrumental in driving the success of our trading strategies and maintaining our competitive edge in the financial markets.

Location

New York

Responsibilities

• Design, implement, and support high-performance network infrastructure and services that enable reliable, low latency connectivity across trading, market data, and enterprise platforms.
• Partner with software engineering, infrastructure, and business teams to build scalable platforms, improve system reliability, and streamline operational workflows.
• Develop automation, tooling, and observability solutions to improve infrastructure management, deployment processes, monitoring, and incident response.
• Monitor and optimize network and system performance, proactively identify bottlenecks, and implement improvements to enhance reliability and efficiency.
• Troubleshoot complex issues across network, systems, and application layers to minimize operational impact and improve service availability.
• Contribute to the design and operation of resilient infrastructure platforms, including capacity planning, lifecycle management, and technology modernization initiatives.
• Implement and maintain security controls and operational best practices to protect critical infrastructure and data.
• Evaluate emerging technologies and industry trends, recommending solutions that improve performance, scalability, and operational excellence.

Qualifications

• Experience designing, operating, and troubleshooting large-scale networked infrastructure in financial services, technology, cloud, telecommunications, or other performance-sensitive environments.
• Strong understanding of networking fundamentals, including routing, switching, network protocols, and traffic engineering.
• Experience working with Linux-based systems and distributed infrastructure environments.
• Familiarity with automation and software development practices; experience with Python, Go, or similar languages is a plus.
• Experience with observability, monitoring, incident management, and reliability engineering practices.
• Ability to diagnose and resolve issues across infrastructure, network, and application layers.
• Familiarity with cloud, hybrid infrastructure, or platform engineering concepts is beneficial.
• Exposure to market data systems, exchange connectivity, trading platforms, or financial services technology is a plus, but not required.
• Strong communication, collaboration, and problem-solving skills in fast-paced environments.

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.

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.