> Markdown version of [/jobs/ext/2153698-senior-information-systems-engineer-onsite-el-segundo-ca](https://www.wearedevelopers.com/jobs/ext/2153698-senior-information-systems-engineer-onsite-el-segundo-ca). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Information Systems Engineer - Onsite El Segundo, CA - **Company:** RTX - **Location:** El Segundo, CA, United States - **Experience:** Expert - **Salary:** $95,500.0 - $181,700.0 - **Contract:** Permanent contract - **Skills:** Microsoft Windows, Apple IOS, Systems Engineering, Configuration Management, Cyber Security, Information Systems, Dynamic Host Configuration Protocol, Linux, Disaster Recovery, Domain Name System (DNS), Linux System Administration, Networking Basics, Routing, Package Management Systems, Ansible, Software Configuration Management, TCP/IP, Firewalls (Computer Science), Selinux, Infrastructure Automation Frameworks, Information Technology, Iptables, Patch Management, Nessus, Operational Systems, CIS Benchmarks, Splunk, User Administration, Vulnerability Analysis - **Published:** August 20, 2026 - **Apply:** https://globalhr.wd5.myworkdayjobs.com/REC_RTX_Ext_Gateway/job/US-CA-EL-SEGUNDO-E01--2000-E-El-Segundo-Blvd--BLDG-E01/Senior-Information-Systems-Engineer---Onsite-El-Segundo--CA_01868008 ## About the Role Active and transferable U.S. government issued security clearance is required prior to start date. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance, * Bachelor's Degree in Science, Technology, Engineering, or Mathematics (STEM) * Minimum of five (5) years of relevant experience OR an advanced degree in STEM and a minimum of 3 years relevant experience * Minimum 3 years of Linux systems administration experience * Networking fundamentals such as TCP/IP, DNS, DHCP, routing, and/or firewalls such as iptables/firewalld * Package management such as yum/dnf, apt and/or repository management * Experience with user account management, software installation and or technical customer support * U.S. Citizen with current DoD Government issued Secret security clearance day one Qualifications We Prefer * Certifications: DoD 8570.01M IAT II certified credentials (Security+, CISM, etc.), or ability to obtain within 6 months of start * Systems Engineering Experience: Systems Engineer managing Operational Technology (OT) experience and/or test systems in a production environment * OS & Systems Administration: Experience with Windows and Linux (desktop and server), including networking administration and user/permissions management such as AD integration, sudo, SELinux/AppArmor basics * Security & Hardening Practices: Experience with backup/recovery procedures, baseline hardening such as CIS benchmarks, STIGs, and vulnerability scanning tools such as Nessus, OpenSCAP * Automation/Configuration Management: Experience with configuration management tools (e.g., Ansible), including writing and maintaining playbooks for patch management and routine configuration * Troubleshooting & Communication: Troubleshooting skills across Windows/Linux systems, customer service orientation, and oral/written technical communication with independent problem-solving ability ## Description * Provide Cybersecurity compliance guidance to engineering for production and procurement of Test Equipment (TE) * Support Flight Test capabilities and processes for Raytheon test systems * Develop Cybersecurity Compliant TE (Linux, IOS, Windows) * Install software packages/updates to enhance operations and testing of production hardware * Troubleshoot production and development TE to ensure connectivity, functionality, compliance, and test integrity * Collaborate with Digital Technologies to integrate TE into controlled networks or enterprises * Collaborate with Cybersecurity to ensure TE compliance (using tools such as Nessus, Splunk, Ivanti, and locally procured software * Collaborate with engineering to ensure changes do not affect the availability or test integrity on the TE * Support all reviews required prior for implementation of any changes to the TE ## Related Videos - [Our journey with Spring Boot in a microservice architecture](https://www.wearedevelopers.com/videos/511-our-journey-with-spring-boot-in-a-microservice-architecture) - [Docker network without Docker](https://www.wearedevelopers.com/videos/1418-docker-network-without-docker) - [Security Pitfalls for Software Engineers](https://www.wearedevelopers.com/videos/726-security-pitfalls-for-software-engineers) - [Docker exec without Docker](https://www.wearedevelopers.com/videos/1094-docker-exec-without-docker) - [What makes Cybersecurity different for critical infrastructure?](https://www.wearedevelopers.com/videos/571-what-makes-cybersecurity-different-for-critical-infrastructure) - [Discover the open source trio you didn’t expect: .NET and PostgreSQL on Linux](https://www.wearedevelopers.com/videos/2042-discover-the-open-source-trio-you-didn-t-expect-net-and-postgresql-on-linux) ## Related Articles - [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated) - [Where to Find Entry-Level Software Engineering Jobs](https://www.wearedevelopers.com/magazine/397-where-to-find-entry-level-software-engineering-jobs) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Top-Paying Tech Jobs (with Salaries)](https://www.wearedevelopers.com/magazine/372-top-paying-tech-jobs-with-salaries) - [Dev Digest 134 - Where pixels sing?](https://www.wearedevelopers.com/magazine/477-dev-digest-134-where-pixels-sing)