HR Assistant: In-Office Support & Onboarding

Gtsc; Chantilly (VA); On-site; USD 42,000 - 52,000; Full time

Job summary

GTSC seeks an HR Assistant for its Chantilly, Virginia headquarters. The role provides administrative and operational support across the HR department, assisting with onboarding, offboarding, responsibilities, and communications.

You will work with HR teammates across programs, handling confidential information with discretion and coordinating multiple HR initiatives. A degree in HR or related field is preferred, with 1–2 years of relevant experience.

Qualifications

• Bachelor's degree preferred in HR, Communications, Business Administration or related field.
• 1–2 years of professional HR/administration experience.
• Strong written and verbal communication; ability to draft professional employee communications.
• Excellent organizational skills; manage multiple deadlines and follow-up items.
• High attention to detail and accuracy.
• Ability to learn new systems and HR concepts quickly.
• Ability to handle confidential information with discretion.
• Ability to work with multiple stakeholders including managers and vendors.

Responsibilities

• Provide day-to-day administrative and operational support to HR staff.
• Monitor HR inboxes and route inquiries to the appropriate HR team member.
• Assist with onboarding and offboarding activities and communications.
• Process routine HR transactions in HR systems (new hires, terminations, changes, promotions).
• Assist with employment verifications and documentation requests.
• Assist with I-9 verification and E-Verify processing and records.
• Prepare HR correspondence, forms, letters, and communications using templates.
• Maintain electronic personnel records and filing in systems.
• Support benefits invoice reconciliation and eligibility checks.
• Track completion of corporate, compliance, and employee training.
• Assist with performance review tracking and recurring HR processes.
• Maintain HR trackers, calendars, reports and deadlines.
• Assist with HR audits, document reviews, and records maintenance.
• Support distribution of HR announcements and internal communications.
• Assist with HR projects by gathering information and coordinating with stakeholders.
• Maintain strict confidentiality of information.
• Perform other duties as assigned.

Skills

Written communication

Oral communication

Organizational skills

Attention to detail

Discretion with confidential info

Ability to learn new systems

Team collaboration

Multitasking

Education

Bachelor's degree in Human Resources or related field

Tools

Microsoft Office Suite

HRIS

ATS

SharePoint

Job description

GTSC seeks an HR Assistant for its Chantilly, Virginia headquarters. The role provides administrative and operational support across the HR department, assisting with onboarding, offboarding, responsibilities, and communications.

You will work with HR teammates across programs, handling confidential information with discretion and coordinating multiple HR initiatives. A degree in HR or related field is preferred, with 1–2 years of relevant experience.