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Site Reliability Engineer

Citadel Securities
🇺🇸New York🇺🇸Miami🇬🇧London🇸🇬Singapore🇦🇺SydneyJuniorFull-time$125k–$350kPosted June 5, 2026

About the Role

Citadel Securities is seeking a Site Reliability Engineer to support our technology-driven global market-making operations. This role involves first-line support, root cause problem diagnosis, and infrastructure management within a real-time, distributed environment. Successful candidates will organize application migrations, manage large-scale capacity planning and deployments, and collaborate with multiple teams on troubleshooting and brainstorming sessions.

  • UNIX/Linux command line expertise and TCP/IP networking knowledge
  • First-line support and problem diagnosis in distributed systems
  • Large-scale application and infrastructure capacity planning
  • Application migrations and infrastructure upgrades
  • Strong communication and collaborative problem-solving skills

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 (3+ years experience)
  • Large-scale application and infrastructure capacity planning and deployment (3+ years experience)
  • Organizing application migrations and infrastructure upgrades (3+ years experience)
  • Clear ability to collaborate with multiple colleagues and lead brainstorming and troubleshooting sessions
  • Good verbal communication skills with 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)

What You'll Get

  • $125k–$350k base salary
  • Medical insurance
  • Life insurance
  • Retirement plans
  • Tax-free savings plans
  • Access to other healthcare programs
  • Discretionary incentive compensation program