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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Linux & Infrastructure Engineer - **Company:** Aria, Limited Liability Company - **Location:** Madison, VA, United States - **Experience:** Expert - **Salary:** $128,000.0 - $158,000.0 - **Contract:** Permanent contract - **Skills:** Bash Shell, Ubuntu (Operating System), Command-Line Interface, Computer Clusters, Configuration Management, Cyber Security, System Configuration, Software Debugging, Linux, Domain Name System (DNS), Identity and Access Management, Virtual Private Networks (VPN), Python (Programming Language), Network Security, Lightweight Directory Access Protocols (LDAP), Linux System Administration, Networking Basics, Routing, Ansible, Prometheus, Simple Network Management Protocols, Systems Architecture, Virtual Local Area Networks, Ceph (Software), Scripting, Google Cloud, Data Storage Technologies, Sysadmin, Grafana, Firewalls (Computer Science), Gitlab, Git, Containerization, Gitlab-ci, Kubernetes, Information Technology, Bare Metal, Firewall Services Module, Docker, Elk Stack - **Published:** September 6, 2026 - **Apply:** https://www.indeed.com/viewjob?jk=9f167aae092860e3 ## About the Role This is a boots-on-the-ground engineering role for a Senior Linux & Infrastructure Engineer who thrives on execution but values team alignment. You must be equally comfortable racking physical hardware, routing a local firewall, configuring an Ubuntu server from the command line, and debugging a broken Git repository., * U.S. Citizenship Required: Applicants must be U.S. citizens. Due to immediate operational timelines, you must possess an active Secret (or higher) clearance, OR be fully eligible for immediate reinstatement (separated from a cleared GovCon/DoD role within the last 24 months under favorable conditions). We cannot accommodate initial clearance sponsorships or prolonged adjudicative delays for this vacancy. * Education & Experience: Bachelor's degree in a relevant technical field or equivalent professional training and experience in systems administration/security operations. * Practitioner Role: This is an individual contributor role focused on technical execution, not personnel management. You are the person who configures the hardware and writes the scripts that automate your workflows., * Linux Focus: 2+ years of experience in Linux-heavy environments with a focus on automation and security * Modern Sysadmin Toolkit: Proven experience with Linux administration, GitLab CI/CD, and Containerization (Docker) * Networking Expertise: Demonstrated ability to configure and troubleshoot complex firewall rules and secure network architectures. Knowledge of networking fundamentals (VPN, Firewalls, VLANs) and secure system architecture * Automation Mindset: Proven ability to use scripting (Bash, Python) and configuration management to eliminate manual tasks * Collaborative Humility: Demonstrated ability to communicate technical solutions to non-IT peers with patience and a focus on collective success. Ability to partner with software engineers to optimize pipelines and remove technical bottlenecks * Certifications: IAM Level I or II certification (or ability to obtain within 6 months) Desirable Skills, Qualifications, and Experience * Security Experience: Prior experience as an ISSO or working within RMF/CMMC frameworks * Security-First Automation: Experience automating STIG and/or NIST compliance via scripting or Ansible * HPC Support: Experience managing GPU-accelerated clusters and high-speed data storage (Ceph/Gluster) * Monitoring: Experience with Grafana, Prometheus, or ELK stack for system health and security auditing Professionalism * Feedback Resilience & Growth Mindset: A demonstrable history of actively seeking out constructive critique, learning from mistakes, and continuously adapting your technical process based on feedback. * Peer Appreciation: A track record of working effectively in cross-functional environments, with a demonstrated ability to recognize, value, and learn from the diverse skills of your teammates. * Accountable Execution: A proven track record of taking complete, reliable ownership of IT systems from concept to delivery, while proactively communicating progress and potential roadblocks to the team and meticulously documening your own work. ## Description ARiA is seeking a Senior Linux & Infrastructure Engineer to design, deploy, and maintain the high-performance computing (HPC) environments that power our research. As a key member of our 20-person team, you will serve as a technical enabler, building the automated, resilient systems that allow our scientists to work at scale. We are looking for a true infrastructure builder, not just a maintainer. You will be spearheading the stand-up of a new server room in our renovated Madison facility, configuring bare-metal Kubernetes (K8s) and GPU clusters, and managing racks of GPU servers delivering petaflops of processing power. The ideal candidate is a highly sophisticated Linux generalist who prioritizes system usability and engineering efficiency alongside rigorous security. We value those who take pride in technical stewardship-the practice of engineering complex bare-metal and virtualized systems through transparency, high-quality documentation, and reproducible code. Our Culture We operate as an agile, highly communicative team rather than a rigid bureaucracy. We seek "principled pragmatists"-low-ego individuals who have the confidence to design and defend a secure technical architecture, but the humility to pivot or change a process when a teammate, an audit, or new data exposes a superior approach. We value those who love learning, actively seek out constructive feedback to master their craft, and remain calm and collaborative when operational or security challenges arise. At ARiA, we celebrate team wins and value the unique contributions of every colleague., * Technical Stewardship: Lead the design, deployment, and administration of ARiA's IT infrastructure, focusing on creating frictionless workflows for researchers within our high-performance Linux environments using containerization and automation * Security Implementation (ISSO): Serve as the local ISSO, working with the ISSM and our Seattle-based SecOps Engineer (who drives enterprise eMASS reporting, RMF A&A, and Google Cloud administration) to execute local hardware STIGs, configure secure network boundaries, and apply technical controls for Classified (NIST 800-53) and CUI (NIST 800-171/CMMC) environments. Lead the configuration and auditing of firewalls and secure network boundaries * Automation-First Operations: Manage DNS, LDAP, and configuration management through IaC (Ansible/Nix), ensuring all systems are reproducible, documented, and easily audited * Research Support: Provide high-tier support for GPU-accelerated HPC clusters, containerized workloads (Docker/Kubernetes), and CI/CD pipelines (GitLab) * Resilience: Maintain and regularly test backup/recovery solutions and central monitoring (Grafana/SNMP) to ensure 24/7 mission readiness