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Site Reliability Engineer

Citadel Securities
🇦🇺SydneyMediorFull-timePosted June 5, 2026

About the Role

Citadel Securities is seeking a Site Reliability Engineer to support its technology-driven global market-making operations. This role involves first-line support and root cause problem diagnosis within real-time, distributed environments, managing large-scale application and infrastructure capacity planning and deployment, and organizing application migrations and infrastructure upgrades. The successful candidate will collaborate with multiple colleagues on live troubleshooting sessions and stay current with technology trends in a fast-paced financial services environment.

Requirements

  • Good knowledge of UNIX/Linux command line
  • Good understanding of TCP/IP and UDP networking in applications
  • Basic understanding of network routing and troubleshooting
  • Basic experience in writing SQL database queries
  • Basic experience in Bash, Python or other scripting language
  • First line support and root cause problem diagnosis within a real-time, distributed environment
  • Large-scale application and infrastructure capacity planning and deployment
  • Organizing application migrations and infrastructure upgrades
  • Clear ability to collaborate with multiple colleagues and lead brainstorming and other live troubleshooting sessions
  • Good verbal communication skills with a self-driven, inquisitive attitude to problem-solving
  • Clear ability to manage multiple priorities and deadlines
  • Genuine curiosity in technology and staying abreast of current technology trends
  • Trading desk support experience and knowledge of trading systems and applications (preferred)
  • Intermediate-level Python development experience (preferred)
  • Understanding of operating system performance tuning (preferred)