Senior Linux Systems Administrator

RAPIDFORT

. 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 .

Posted 11/4/2026full-timeRemote • United StatesSenior💰 $125,000 - $165,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates extensive expertise in administering and hardening Linux servers, managing AWS resources, and implementing automation through Bash and Python. Proficient in incident response, configuration management, and maintaining security practices within a remote infrastructure environment.

Highest-signal resume keywords

Linux Server AdministrationAWS Resource ManagementBash ScriptingAnsible AutomationIncident Response Leadership

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Linux ProcessesDebian AdministrationTCP/IP NetworkingKVM/QEMU VirtualizationMonitoring and AlertingGitLab AdministrationInfrastructure as CodeZFS Filesystem ManagementSystemd ManagementTraffic Shaping

Soft Skills

Clear Written CommunicationIndependent Work

Tools & Technologies

AWS EC2AWS S3DockerGitTcpdumpWiresharkTerraformOpenTofuJenkinsProxmox

Industry Keywords

Infrastructure ManagementConfiguration ManagementIncident ResponseSecurity PracticesData Center Operations

Tech Stack

Tools & technologies

AnsibleAWSCloudDNSDockerEC2FirewallsJenkinsKubernetesLinuxPythonTCP/IPTerraformVMware

About the role

Key responsibilities & impact

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

What you’ll need

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

Comp & perks

Equity
Benefits
Shared on-call rotation
Scheduled maintenance windows