Human Resources Generalist - Payroll/Recruitment (Full Time)

Castelion is moving incredibly fast to develop and deliver advanced defense systems at a time when execution matters more than ever. We believe focus, ownership, and excellence are decisive advantages - and we're building a world-class team to turn bold ideas into real capability.

Castelion is moving incredibly fast to develop and deliver advanced defense systems at a time when execution matters more than ever. We believe focus, ownership, and excellence are decisive advantages - and we're building a world-class team to turn bold ideas into real capability.

As an HR Coordinator at Castelion , you’ll play a critical role in keeping our people operations running smoothly while helping build the infrastructure needed for our next stage of growth. You’ll own key processes across the employee lifecycle, including I-9 and E-Verify compliance, benefits administration, onboarding, time and attendance, offboarding, employee support, and HR reporting. You’ll be a trusted resource for employees and a key operational partner to the HR team. HR Operations & Employee Support

Serve as support for employee questions related to HR, payroll, benefits, policies, time and attendance, and other workplace needs.

Process employee lifecycle changes, including hires, transfers, promotions, manager changes, status changes, and separations.

Maintain accurate HRIS data and employee records while handling sensitive information with discretion.

Triage workplace concerns and elevate complex or sensitive matters to the appropriate HR team member.

Track and drive completion of required employee training, including compliance, safety, and company‑mandated training, ensuring deadlines are met and records remain accurate and audit‑ready.

Support Workers’ Compensation claims, including documentation, claim tracking, employee follow‑up, and coordination with the Workers’ Compensation carrier.

Partner with Recruiting to deliver a seamless transition from offer acceptance through onboarding, including pre‑employment requirements, HRIS setup, employment documentation, and required acknowledgements.

Support offboarding coordination, including separation documentation, HRIS transactions, payroll inputs, benefits notifications, and cross‑functional workflows.

Review hourly employee timesheets in preparation for bi‑weekly payroll and support time and attendance compliance.

HR Reporting & Process Improvement

Build and maintain HR reports, dashboards, and KPIs, including headcount, turnover, attendance, and other workforce metrics.

Analyze HR data to identify trends, discrepancies, and opportunities for improvement.

Improve HR processes, tools, and workflows through stronger controls, automation, and scalable solutions.

Associate’s or Bachelor’s degree in Human Resources, Business, or a related field, or equivalent professional experience.

2+ years of HR, People Operations, or related experience.

Excellent written and verbal communication and relationship‑building skills.

Strong judgment and discretion when handling confidential information.

Proficiency with HR systems, spreadsheets, reporting, and employee data.

Ability to work onsite full‑time. Experience supporting hourly and non‑exempt employee populations.

Strong Excel skills, including formulas, XLOOKUP/VLOOKUP, pivot tables, data analysis, and reporting

Government sites, systems, or information, as determined by the Company and/or applicable U.Government security clearance or other government authorization, and to satisfy any citizenship or other eligibility requirements imposed by applicable law, regulation, executive order, or government contract requirements. We are committed to providing equal employment opportunities to all applicants and employees without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, genetic information, protected veteran status, or any other characteristic protected by applicable federal, state, or local law.

Castelion is committed to providing reasonable accommodations to qualified individuals with disabilities throughout the application and hiring process. If you require a reasonable accommodation to complete an application, participate in the interview process, or otherwise participate in the hiring process, please contact View email address on click.appcast.io position requires access to export‑controlled information, and as such, employment (or hiring of a contractor) is contingent upon the candidate’s ability to access all applicable export‑controlled information without additional export licensing being required by the Bureau of Industry and Security and/or the Directorate of Defense Trade Controls.

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