Linux System Administrator

Location: New York, in office full time

About Selini:

Selini is a global trading firm focused on systematic trading and venture investing - all within the digital assets space.

We are seeking a Linux System Administrator with 3–15 years of experience to support and optimize our trading infrastructure. This role will focus on managing and improving our on-prem and cloud-based systems, ensuring high availability, security, and performance for our trading environment.

• Administer and maintain Rocky Linux-based infrastructure for trading and research environments.
• Manage on-prem clusters (HTCondor) and AWS-based infrastructure, ensuring reliability and efficiency.
• Automate system administration tasks using Bash, Python, or Ansible.
• Monitor system performance, troubleshoot issues, and implement optimizations.
• Ensure security best practices are followed for system hardening and access control.
• Handle network configuration, performance tuning, and troubleshooting.
• Work closely with developers and traders to support infrastructure needs.
• Manage user accounts, permissions, and system-level access controls.

• 3–15 years of experience in Linux system administration (Rocky Linux preferred).
• Strong experience with system automation and scripting (Bash, Python, or Ansible).
• Experience managing on-prem clusters and AWS-based environments.
• Deep understanding of networking fundamentals, system security, and performance tuning.
• Experience with monitoring and logging tools to ensure system health and availability.

• Familiarity with HTCondor or other high-performance compute clusters.
• Experience with low-latency or high-performance trading environments is a plus.
• Strong troubleshooting and problem-solving skills in production-critical environments.
• Ability to work independently and collaborate across teams.

• Strong analytical mindset and ability to work in high-pressure, real-time environments.
• Team-oriented, with a focus on collaboration and proactive problem-solving.

We’re a close-knit team that values:

• High ownership and initiative
• Curiosity, intellectual honesty, and rapid learning
• Clear, direct communication
• Working together toward shared goals — no ego, no politics

We hire people who love building, solving, and improving — and who want to learn from and contribute to a team of exceptional peers.
Compensation & Benefits:

• Very competitive compensation, with strong upside based on contribution and performance
• Competitive holiday allowance 
• Free daily Deliveroo lunch
• High-spec office and technology
• Team socials
• Global company offsites and development opportunities