Senior Linux Network Systems Administrator

Overview This role requires working onsite 5 days each week. We are unable to sponsor for this permanent full-time role. Position is bonus eligible. Prestigious Financial Institution is currently seeking a Senior Linux Network Systems Administrator. Candidate will be responsible for designing, maintaining, and optimizing the firm’s high-performance trading infrastructure across on-premise and hosted environments. The ideal candidate thrives in fast-paced, mission-critical environments and possesses deep Linux systems expertise, strong automation skills, and experience supporting low-latency trading systems. The Senior Systems Engineer will work closely with traders, quantitative researchers, developers, and infrastructure vendors to ensure the stability, scalability, and performance of the firm’s global trading environment. Responsibilities Systems Administration: Administer the firm’s Linux server fleet, including provisioning, patching, package management and storage Systems Administration: Perform performance tuning, capacity planning, log analysis, and root-cause analysis on Linux hosts Systems Administration: Administer NFS storage on Linux: export configuration, client mounts, permissions, quotas, performance tuning, and troubleshooting Systems Administration: Administer the firm’s Microsoft 365 tenant, including Entra ID (Azure AD), Exchange Online, Teams, SharePoint Online, and OneDrive Systems Administration: Configure and maintain Intune / endpoint management policies for Windows devices Systems Administration: Maintain mail flow, anti-spam, anti-phishing, retention, and data-loss-prevention policies Network Administration: Administer the firm’s network infrastructure: switches, routers, firewalls, VPN, VLANs, and wireless Network Administration: Manage core network services including DNS, DHCP, NTP, and certificate infrastructure Network Administration: Monitor network performance, troubleshoot connectivity and latency issues, and coordinate with carriers, ISPs, and market-data vendors as needed Network Administration: Implement and maintain network segmentation, ACLs, and firewall rules aligned with the firm’s security policy Identity and access management: Own the end-to-end identity lifecycle: onboarding, offboarding, role changes, and periodic access reviews across Linux, Windows, and M365 Security and access controls: Manage SSO, MFA, password policies, and privileged-access controls Access management: Administer access to internal applications, file shares, mailing lists, and shared mailboxes Operations: Run monitoring, alerting, and on-call/incident response for infrastructure and end-user systems Operations: Manage workstation and laptop imaging, deployment, and full hardware lifecycle Documentation: 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 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 Excellent communication skills and ability to collaborate with both technical and non-technical stakeholders Preferred Qualifications Experience with cloud infrastructure platforms such as AWS or Google Cloud Platform Experience with storage systems and high-throughput data environments Knowledge of low-latency performance tuning and systems optimization Exposure to cybersecurity best practices and infrastructure hardening #J-18808-Ljbffr Request Technology, LLC