Citadel Securities is seeking a Senior Platform Infrastructure Engineer to design, build, and maintain robust infrastructure supporting their trading platforms. The role involves collaborating with cross-functional teams to ensure high availability, scalability, and performance of critical systems. Candidates must have strong expertise in systems engineering, cloud technologies, automation, and scripting, with experience in Linux environments and container orchestration. This full-time position offers the opportunity to work in a dynamic, fast-paced environment focused on cutting-edge financial technology.