Human Resources Assistant II

Amentum is seeking a Human Resources Assistant II for the Las Vegas, NV office to provide clerical, administrative, and technical support to the Human Resources function. Works under general supervision.

The selected candidate will provide clerical, administrative, and technical support to the Human Resources function. He/she will report directly to the with functional s HR/LR Manager with functional supervision and strategic guidance provided by the HR Business Partner (HRBP). Duties and responsibilities listed below are not mutually exclusive.

Essential Responsibilities:

• Handles incoming and outgoing correspondence. Opens, date stamps, and distributes incoming mail. Prepares and sends outgoing mail including benefit change information.
• Performs typing, word processing, spreadsheet, and database work. Maintains correspondence, forms, listings, files, reports, and automated personnel records and information. Reconciles data in the automated Human Resources Information Systems (HRIS) and other sources of employee information.
• Maintains data integrity and ensures accurate and consistent data entry.
• Verifies HRIS data entered against source documents.
• Prepares and processes a complete range of personnel actions including hires (i.e., regular full-time, temporary, and part-time employees), rehires, terminations, transfers, pay changes, status changes, etc.
• Ensures and maintains compliance of I-9s, W-4s, contracts, etc.
• Partners with recruitment/talent acquisition to ensure pre-boarding process goes smoothly.
• Partners and collaborates with Payroll to ensure timely submittals of required documents and employment changes
• Prepares and processes new hire, onboarding, paperwork, and coordinates logistics to conduct new hire orientation sessions.
• Serves as the primary point of contact for new employee inquiries.
• Assists with payroll and benefit deductions, allocations, reconciliations, audits, and payment approvals and collections.
• Provides and obtains employee information to facilitate and support the daily administrative, operational, and legal functions of the HR department.
• Assists in the compilation and preparation of forms, reports, and projects.
• Perform all other position-related duties as assigned or requested.

Minimum Position Knowledge, Skills, and Abilities Required:

• Associate's degree in HR or related field and equivalent training/experience with 3 years of related experience.
• Proficient knowledge of Federal Acquisition Regulations, including labor laws for construction and services.
• Ability to clearly communicate, both orally and in writing.
• Advanced skills in the use of general office equipment, including copiers, fax machines, and computers.
• Analytical, negotiating, and organizational skills at an intermediate level.
• Ability to create and maintain a positive team atmosphere with effective interpersonal skills, and the ability to work professionally with a variety of people and personalities.
• Ability to exercise independent judgment and prioritize work assignments/tasks.
• Demonstrates initiative and problem-solving skills.
• Ability to maintain accurate records and prepare required reports.
• Ability to meet deadlines and handle potentially stressful situations.
• Good communication, organizational, and analytical skills.
• Proficient in the use of Microsoft Excel and Word, Workday, ADP Payroll at an advanced level or higher.
• Valid State driver's license.
• Position may require the ability to pass and maintain a Secret Security Clearance.

Preferred:

• 1 - 3 years of experience in a fast-paced, high-turnover setting.
• Previous experience working with union (represented) employees.
• Ability to manage rapid onboarding/offboarding cycles and high-volume digital communication, including HR support services.
• PHR or SHRM-CP certification.

Work Environment, Physical Demands, and Mental Demands:

• Physical effort involving able average standing, sitting, walking or detail work.
• Must be able to lift and carry up to 20 lbs.
• Dexterity to operate office equipment as required by the position.
• Occasional risk of injury due to hazards.
• Ability to maintain focus, make timely decisions, or apply established protocols in high-stress situations.
• Ability to read, write, and verbally communicate English proficiently

Other Responsibilities:

Safety - Amentum enforces a safety culture whereby all employees have the responsibility for continuously developing and maintaining a safe work environment. As appropriate, each employee is responsible for completing all training requirements and fulfilling all self-aid/buddy aid responsibilities, participating in emergency response tasks and serving on safety committees and teams.

Quality - Quality is the foundation for the management of our business and the keystone to our goal of customer satisfaction. It is our policy to consistently provide services that meet customer expectations. Accordingly, each employee must conform to the Amentum Quality Policy and carry out job activities in compliance with applicable Amentum Quality System documents and customer contracts. Each employee must read and understand his/her Quality Management and Customer Satisfaction responsibilities.

Procedure Compliance - Each employee must read, understand and implement the general and specific operational, safety, quality and environmental requirements of all plans, procedures and policies pertaining to his/her job.

Compensation Details:
$25 - $27

The compensation range or hourly rate listed for this position is provided as a good-faith estimate of what the company intends to offer for this role at the time this posting was issued. Actual compensation may vary based on factors such as job responsibilities, education, experience, skills, internal equity, market data, applicable collective bargaining agreements, and relevant laws.

Benefits Overview:

Our health and welfare benefits are designed to support you and your priorities. Offerings include:

• Health, dental, and vision insurance
• Paid time off and holidays
• Retirement benefits (including 401(k) matching)
• Educational reimbursement
• Parental leave
• Employee stock purchase plan
• Tax-saving options
• Disability and life insurance
• Pet insurance

Note: Benefits may vary based on employment type, location, and applicable agreements. Positions governed by a Collective Bargaining Agreement (CBA), the McNamara-O'Hara Service Contract Act (SCA), or other employment contracts may include different provisions/benefits.

Original Posting:
04/07/2026 - Until Filled
Amentum anticipates this job requisition will remain open for at least three days, with a closing date no earlier than three days after the original posting. This timeline may change based on business needs.

Amentum is proud to be an Equal Opportunity Employer. Our hiring practices provide equal opportunity for employment without regard to race, sex, sexual orientation, pregnancy (including pregnancy, childbirth, breastfeeding, or medical conditions related to pregnancy, childbirth, or breastfeeding), age, ancestry, United States military or veteran status, color, religion, creed, marital or domestic partner status, medical condition, genetic information, national origin, citizenship status, low-income status, or mental or physical disability so long as the essential functions of the job can be performed with or without reasonable accommodation, or any other protected category under federal, state, or local law. Learn more about your rights under Federal laws and supplemental language at Labor Laws Posters .