• As a Senior Systems Administrator, you will be responsible for the design, operation, hardening, and reliability of our Linux infrastructure across multiple networks and data centers including: • Administer and harden Red Hat Enterprise Linux/Rocky Linux systems across production, staging, and internal networks • Operate infrastructure spanning multiple data centers, including segmented networks, DMZs, and private backend tiers • Manage and secure services including: • Apache / PHP-FPM • SFTP / FTPS (ProFTPD or equivalent) • MySQL / Percona (including Galera clusters and proxies) • HAProxy / reverse proxies / WAF-style architectures • Design and maintain high-availability and fault-tolerant systems • Implement and maintain security controls: • SELinux (enforcing, custom policies) • iptables / nftables / ipset • TLS hardening (FIPS-aware where applicable) • MFA, access controls, and least-privilege enforcement • Support and contribute to compliance efforts (SOC 2, HIPAA, FedRAMP-aligned controls), including evidence collection and control validation • Automate system configuration and maintenance using Ansible, shell scripting, and/or Python • Troubleshoot complex production issues across OS, network, and application layers • Participate in change management, incident response, and root cause analysis • Collaborate closely with engineering, support, and compliance teams to keep systems stable, secure, and auditable • Log into systems, read logs, understand packet flow, and know *why* something is not working as expected.