Sr. Linux System Engineer

***5 Days Onsite***

***We are unable to sponsor as this is a permanent full-time role***

A prestigious company is looking for a Sr. Linux System Engineer. This is with a trading company, and this engineer needs previous industry experience in trading. The role is focused on Linux system administration, networking, scripting, etc.

Responsibilities

• Administer the firm s Linux server fleet, including provisioning, patching, package management and storage
• Perform performance tuning, capacity planning, log analysis, and root-cause analysis on Linux hosts
• Administer NFS storage on Linux: export configuration, client mounts, permissions, quotas, performance tuning, and troubleshooting
• Administer the firm s Microsoft 365 tenant, including Entra ID (Azure AD), Exchange Online, Teams, SharePoint Online, and OneDrive
• Configure and maintain Intune / endpoint management policies for Windows devices
• Maintain mail flow, anti-spam, anti-phishing, retention, and data-loss-prevention policies
• Administer the firm s network infrastructure: switches, routers, firewalls, VPN, VLANs, and wireless
• Manage core network services including DNS, DHCP, NTP, and certificate infrastructure
• Monitor network performance, troubleshoot connectivity and latency issues, and coordinate with carriers, ISPs, and market-data vendors as needed
• Implement and maintain network segmentation, ACLs, and firewall rules aligned with the firm s security policy
• Own the end-to-end identity lifecycle: onboarding, offboarding, role changes, and periodic access reviews across Linux, Windows, and M365
• Manage SSO, MFA, password policies, and privileged-access controls
• Administer access to internal applications, file shares, mailing lists, and shared mailboxes
• Run monitoring, alerting, and on-call/incident response for infrastructure and end-user systems
• Manage workstation and laptop imaging, deployment, and full hardware lifecycle
• Maintain technical documentation, runbooks, and disaster-recovery procedures

Qualifications

• Bachelor s degree in Computer Science, Engineering, Information Systems, or a related technical field
• 5+ years of experience in systems engineering, infrastructure engineering, site reliability engineering, or technical operations
• Deep expertise administering Linux environments across multiple distributions
• Strong experience with scripting and automation using Python, Bash, or similar languages
• Experience within proprietary trading, hedge funds, market making, fintech, or other low-latency environments
• Strong understanding of networking fundamentals including TCP/IP, multicast, routing, switching, and performance troubleshooting
• Familiarity with configuration management and orchestration tools such as Ansible, Kubernetes, Docker, or similar platforms
• Experience with monitoring and observability platforms such as Prometheus, Grafana, Nagios, Icinga, InfluxDB, or similar tools
• Strong troubleshooting and problem-solving skills with the ability to operate independently under pressure