Senior Systems Administrator

Senior Systems Administrator, Secure Managed File Transfer (MFT) Platform

Sharetru operates a secure Managed File Transfer (MFT) platform, trusted by organizations requiring high standards for security, compliance, and availability. Our infrastructure spans multiple data centers and network providers, supporting customers subject to stringent controls aligned with SOC 2, HIPAA, and FedRAMP.

Our environment is Linux-first, built for reliability at scale, and intensely security-focused. This role is ideal for a professional who excels in complex systems, prioritizes automation, and understands that production stability is paramount.

Why This Role Matters

This Senior Systems Administrator position is critical to maintaining the reliability and security of the Sharetru platform. The systems under your management directly support customer data integrity, compliance commitments, and business continuity. We seek an individual who values infrastructure that is quiet, deliberate, and robust.

Key Responsibilities: What You'll Do

You will be responsible for the design, operation, hardening, and reliability of our Linux infrastructure across multiple networks and data centers, including:

• Administering and hardening Red Hat Enterprise Linux (RHEL)/Rocky Linux systems across production, staging, and internal networks.
• Operating infrastructure spanning multiple data centers, including segmented networks, DMZs, and private backend tiers.
• Managing and securing core services such as: Apache / PHP-FPM; SFTP / FTPS (ProFTPD or equivalent); MySQL / Percona (including Galera clusters and proxies); and HAProxy / reverse proxies / WAF-style architectures.
• Designing and maintaining high-availability (HA) and fault-tolerant systems.
• Implementing and maintaining advanced security controls: SELinux (enforcing, custom policies); iptables / nftables / ipset; TLS hardening (FIPS-aware where applicable); and MFA, access controls, and least-privilege enforcement.
• Supporting and contributing to compliance efforts (SOC 2, HIPAA, FedRAMP-aligned controls), including evidence collection and control validation.
• Automating system configuration and maintenance using Ansible, shell scripting, and/or Python.
• Troubleshooting complex production issues across OS, network, and application layers.
• Participating actively in change management, incident response, and root cause analysis (RCA).
• Collaborating closely with engineering, support, and compliance teams to ensure systems are stable, secure, and auditable.
• Performing hands-on system diagnostics, including reading logs and understanding packet flow, to resolve unexpected issues.

Required Skills & Experience:

• 7+ years of professional Linux systems administration experience.
• Strong experience with RHEL-based distributions (RHEL, Rocky, CentOS).
• Deep understanding of Linux Networking (routing, firewalls, NAT, VPN concepts), system performance, troubleshooting, filesystems, storage, and backups.
• Proven experience securing Linux systems within regulated environments.
• Experience utilizing SELinux beyond permissive mode.
• Production experience with iptables/nftables/ipset.
• Strong knowledge of TLS, certificates, and cryptography basics.
• Experience operating high-availability systems (clusters, failover, redundancy).
• Solid scripting skills (Bash required; Python a strong plus).
• Familiarity with configuration management tools (Ansible preferred).

Operational & Compliance Expertise

• Experience supporting environments subject to SOC 2, HIPAA, or PCI regulations.
• Understanding of change management, access controls, and audit requirements.
• Comfortable producing documentation and evidence for auditors.
• Ability to implement changes carefully in shared, customer-impacting systems.

Nice to Have Qualifications

• Experience with FedRAMP or NIST 800-53–aligned environments.
• Experience with Percona XtraDB Cluster / Galera / ProxySQL / HAProxy.
• Experience in multi-datacenter or SaaS environments.
• Exposure to Proxmox, VMware, or similar virtualization platforms.
• Experience building or maintaining internal administration tooling.

Professional Expectations

• Strong troubleshooting and critical thinking skills.
• Comfortable working independently and owning systems end-to-end.
• Clear communicator who documents decisions and changes thoroughly.
• Security-first mindset—understanding that functionality alone is insufficient.
• Ability to remain calm under pressure during incidents and outages.

Benefits

• Health Care Plan (Employer-paid Medical, Dental, & Vision).
• Retirement Plan (401k, IRA).
• Paid Time Off (Vacation, Sick Time & Public Holidays).
• Work From Home flexibility.
• Reimbursement for mobile phone and home internet.
• Company-issued computer and necessary technology.