Senior System Administrator/ Developer (DISA)
Confirmed on the employer's own hiring board on Oct 15, 2026. First seen by Alion on Sep 25, 2026.
Senior System Administrator/Developer
Location: Remote, USA
Type --- Future Opportunities -- Proposal
Security Clearance: Must possess an active Secret Clearance.
_______________________________________________________________
Who we are:
Horizon Industries Limited (Horizon) is a dynamic IT and Management Consulting firm based in the Washington, DC area. Founded in 1996, Horizon Industries Limited (Horizon) has evolved into a company of highly qualified professionals that provides full-cycle IT Consultant and Management support in both the private and public sectors.
Horizon’s culture is based on our core values, and we PRIDE ourselves on a diverse, employee, and family-centric approach.
Who we are looking for:
IDEAS is the Defense Information Systems Agency’s Appian-based contract writing system, hosted in the Impact Level 5 Appian Government Cloud with a Data Integration layer in DISA’s Stratus cloud. The Senior System Administrator is a Key Personnel position that owns system administration for IDEAS, keeps the environments patched, secure, and compliant, and serves as the named alternate to the ISSO for STIG, ACAS, and IAVA execution.
Responsibilities
- Own execution of system administration for IDEAS as Key Personnel, directing System Administrator support and coordinating with the Database Administrator and ISSO
- Administer RHEL, Apache HTTP, Oracle Java, and Oracle WebLogic in the Performance, Staging, and Development environments, including system builds and decommissions, user accounts, security groups, and file permissions
- In Staging and Production, administer application-layer components (Appian, Oracle applications, WebLogic) and submit Enterprise Change Requests to the Change Advisory Board and DISA OS, database, and web administration groups
- Test and document security patches for RHEL, Apache, Appian, Java, WebLogic, Oracle Service Bus, Tomcat, and ANT in lower environments using automated scripts, and schedule production deployment through the hosting provider’s Application Service Interruption process
- Serve as the named alternate to the ISSO for STIG checklist reviews, ACAS and HBSS findings, IAVA remediation, and POA&M inputs
- Manage the DoD PKI certificate lifecycle, including certificate signing requests, installation, expiration tracking, Certificate Revocation List updates, and removal of expired or revoked certificates
- Automate log inspection with shell scripting and Splunk, and produce ranked "worst actor" risk and trend reports
- Keep server application components within two releases of the vendor baseline
- Produce and maintain System Administration documentation, SOPs, System Security Plan inputs, system diagrams, administration and troubleshooting guides, and lists of critical services
- Support the base-year effort to achieve and maintain Authority to Operate
Required Qualifications
- 10+ years of IT experience, including 5+ years administering Red Hat Enterprise Linux in production
- 5+ years administering Oracle WebLogic Server
- Experience patching, tuning, and securing Apache HTTP and Java applications
- Hands-on DISA STIG implementation, ACAS remediation, and IAVA compliance in a DoD Risk Management Framework environment
- DoD PKI and SSL/TLS certificate management
- Bash scripting for automation, and Splunk or a comparable log analysis tool
- Experience working through formal change control in a government-hosted environment
- Experience on at least two projects in a large organization administering, operating, maintaining, and securing a large-scale application
Preferred Qualifications
- Oracle Service Bus and Apache Tomcat administration
- Prior DISA experience, including the Stratus cloud or DISA hosting coordination
- Prior IDEAS support
- eMASS, HBSS/ENS, and IAVA workflow experience
- Familiarity with Appian Cloud administration
- RHCSA or RHCE certification
Why you will succeed at Horizon:
Horizon works at the forefront of new features and development practices and supports its employees in being trained and certified in the latest and greatest. As we continue to expand and grow the Horizon brand around the globe, we want to ensure that our team members are growing with us as you are a vital part of our success story. This is a great opportunity for us to invest in our employees by supporting you with the right skills and tools to be successful in your careers. .
Why you will love working with us/ Perks:
- A comprehensive benefits package including healthcare (medical, dental, vision, and disability)
- a 401k program where you are 100% vested from day one with an employer match after 90 days.
- an Educational Assistance program.
- a Student Loan Repayment Program
- Gym Reimbursement Program.
- Paid Time off
- Dynamics, passionate, multi-disciplinary team of creative minds to work with, and many more.
Horizon is an Equal Employment Opportunity employer, and it is our policy to consider all applicants for employment. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, or national origin.
EOE/Vet/Disabled