Senior Linux Systems Administrator

🔥 12 hours ago

🇺🇸 United States – Remote

💵 $125k - $165k / year

⏰ Full Time

🟠 Senior

⌨️ Systems Administrator

🦅 H1B Visa Sponsor

This company has sponsored H1B visas in the past.

👻 Ghost score 4%

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RAPIDFORT

WebsiteLinkedInAll Job Openings

51 - 200 employees

Founded 2020

💼 Consulting

🎖️ Defense

🏥 Healthcare

Consulting • Defense • Healthcare

RAPIDFORT is a software supply chain security company that delivers a SaaS platform to secure containerized applications from build-time through runtime. It provides curated near-zero‑CVE base images, CI/CD image scanning and execution profiling (SBOM/RBOM), automated CVE remediation, runtime hardening and attack-surface reduction, and compliance automation for standards like FedRAMP, SOC 2 and CMMC. The platform is aimed at enterprise engineering and security teams to automate vulnerability remediation, accelerate secure releases, and maintain continuous protection in production.

📋 Description

• Own and operate RapidFort's infrastructure, including bare-metal Linux servers in data centers, virtual machines, containers, networks, self-hosted development services and AWS resources • Build, configure, administer and harden Linux systems • Operate remotely managed physical servers, VMs and containers, including storage, capacity planning and hardware replacement • Manage operating-system lifecycle, patch testing, staged deployment, upgrades, exceptions and end-of-life migrations • Maintain configuration consistency and correct configuration drift • Design, operate and troubleshoot routing, traffic shaping, firewalls, DHCP, DNS and overlay networks • Manage AWS resources, primarily EC2 and S3 • Run self-hosted GitLab, CI runners, build machines and package mirrors • Diagnose production issues involving CPU, memory, disk I/O, filesystems, systemd, networking and service dependencies • Use logs, metrics and command-line tools to identify root causes and validate fixes • Improve monitoring and alerting • Lead incident response, incident reviews and corrective actions • Collaborate with developers, IT, data-center staff and hardware vendors; escalate with clear findings and evidence • Develop and maintain Bash and Python automation • Maintain Ansible roles and playbooks • Store configuration and automation in Git and use merge requests, reviews and automated deployment • Own access control and security practices, including SSH keys, hardware security keys, network policies, least privilege, patching, vulnerability scanning and supply-chain risk • Run and test backups and restores • Plan maintenance with documented procedures, validation steps and rollback plans • Maintain runbooks, configuration records and troubleshooting documentation; review other engineers' changes • Participate in shared on-call rotation and scheduled maintenance windows

🎯 Requirements

• 8+ years of relevant hands-on experience administering Linux servers in production with root responsibility • Experience with physical hardware, not only cloud instances • In-depth knowledge of Linux processes, services, users and permissions, package management, filesystems and logging • Strong experience with Debian and other Linux distributions • Knowledge of UEFI, GRUB, initramfs, kernel configuration and building, kernel modules including DKMS, and sysctl • Experience with cgroups v2, memory management, OOM killer, PSI, strace, perf, iostat, ss and /proc • Experience with systemd and sysvinit • Knowledge of TCP/IP, IPv4/IPv6, subnetting, bridges, VLANs, bonding, NAT and connectivity troubleshooting • Experience with Linux routing, policy routing, traffic shaping with tc, nftables, iptables, DNS and DHCP • Experience with WireGuard and NetBird or similar overlay networks • Experience reading packet captures with tcpdump or Wireshark • In-depth ZFS knowledge; experience with mdadm RAID, LVM, ext4, XFS, filesystem repair, SSD caching and failing-disk handling • Experience with KVM/QEMU or Xen, LXC and Docker, and enough Kubernetes to debug a cluster • Experience with monitoring, alerting, backup and recovery, including restore testing • AWS knowledge including EC2, S3, IAM, EBS and IMDSv2 • Expert Git and GitLab administration experience • Experience with GitOps, infrastructure as code, OpenTofu or Terraform, and configuration management • Experience writing and maintaining Ansible roles and playbooks or using a comparable tool • Knowledge of host hardening, least privilege, firewall design, SSH, SSH certificates, FIDO2 hardware keys, GPG, TLS certificates, secrets management, patch management, vulnerability scanning and supply-chain risk • Expert Bash scripting and good working Python for systems automation • Record of resolving complex technical problems and completing corrective actions • Sound judgment regarding change risk, testing, rollback and escalation • Clear, precise written English • Ability to work independently within a remote team • U.S. citizenship required • Preferred: IPMI, iDRAC, iLO, RAID/HBA controllers, PCIe diagnostics, physical data-center work, GPU/CUDA infrastructure, Proxmox/VMware, SAN/NAS, monitoring tools, Jenkins/build farms, backup tools, SOC 2/ISO 27001 infrastructure, Debian derivatives and other cloud providers

🏖️ Benefits

• Equity • Benefits • Shared on-call rotation • Scheduled maintenance windows

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