HR Administrator

Founded in 1989 and headquartered in Reston, Virginia, SOSi is a private defense and government solutions business specializing in advanced technology systems and mission support. Its capabilities include data science, software development, network engineering, intelligence, surveillance, and reconnaissance (ISR), and logistics.

Job Description

Ready to be the heartbeat of an HR team that moves fast, cares deeply, and makes a real difference for every employee — from day one?

At SOSi, our people are our mission. As our HR Administrator, you'll shape how every new hire experiences joining this company, champion the programs that keep our team engaged and recognized and be the trusted go-to resource employees turn to when it matters most. We're a team that embraces smarter ways of working: we expect you to bring curiosity and confidence in applying AI tools to streamline the manual, repetitive work that has historically defined HR administration — so you can spend more of your energy on the human side of HR. If you're organized, energized by variety, love being the person who makes things happen, and are excited about working at the intersection of people and technology, this role was built for you.

What you'll do

Hit the ground running managing our full recruiting administration — posting and monitoring requisitions in the ATS, generating offer letters, and owning pre-employment documentation with precision. You'll leverage AI-assisted tools to accelerate drafting, tracking, and reporting across these workflows, cutting cycle times without sacrificing accuracy. You'll be the architect of an onboarding experience that sets new hires up for success: guiding employees through the SOSi SPARK program, leading orientation sessions and making sure every piece of compliance documentation — including I-9 and E-Verify — is buttoned up.

Beyond onboarding, you'll keep the engine running across a wide range of HR operations — and you'll look for every opportunity to make those operations faster and more consistent through intelligent automation:

• Maintain accurate employee data and personnel files in HR systems, applying AI-driven auditing and data hygiene practices to reduce manual error.
• Manage the HR inbox, incoming mail, employment verifications, and unemployment claims — using smart triage and templating tools to handle volume efficiently.
• Process purchasing requests.
• Actively participate in HR led employee communication efforts in SOSi Scope reports, and oversee HR content on SOSi Connect.
• Support our Total Rewards team through compensation actions, track performance dates, and create job codes in UKG.
• Assist with Defense Base Act claims administration.
• Oversee various areas supporting Talent Development such as our SOSi Education Reimbursement program.

You'll also play a visible, high-impact role in our people culture — bringing employee recognition programs to life, including the SOSi High Five Awards, coordinating the global engagement initiatives defined in SOSi IGNITE, and being the kind of HR professional employees genuinely trust working with.

Qualifications

What you bring

• Two+ years in an HR coordination or administrative role.
• Demonstrated ability to apply AI tools (such as Microsoft Copilot, ChatGPT, or similar) to automate routine tasks, synthesize information, and improve process efficiency.
• Sharp attention to detail and sound, independent judgment.
• Enthusiasm, drive, and energy for growth.
• Excellent written and verbal communication skills.
• Proven ability to manage competing deadlines in a fast-paced environment.
• Proficiency in Microsoft Office Suite.
• Absolute discretion with sensitive and confidential information.
• Experience with HR or talent management platforms.
• Background supporting government, defense, or large-scale service contracts.

Additional Information

The environment

• This is a fast-paced, dynamic office where no two days look the same — and where a willingness to continuously improve how work gets done is just as valued as getting it done.
• Hybrid work schedule with 2 days in office and 3 days of remote work.

Working at SOSi

All interested individuals will receive consideration and will not be discriminated against for any reason.