Citadel Securities is seeking a Senior Platform Infrastructure Engineer to design, build, and maintain scalable infrastructure supporting their trading platform. The role involves developing automation tools, enhancing system reliability, and collaborating across teams to deliver high-performance solutions. Candidates should have strong expertise in distributed systems, cloud technologies, and programming languages such as Python and C++, along with experience in Linux environments. This full-time position offers the opportunity to work at the forefront of financial technology innovation.