Administrative Assistant III

CorSource; Richland (WA); On-site; USD 42,000 - 65,000; Part time

Job summary

CorSource is seeking an Administrative Assistant III for an on-site, contract role in Richland, WA. The position supports department leadership and staff with confidential administrative duties and cross-functional coordination.

Responsibilities include document control, travel and expense processing, onboarding support, reporting, and office management. The role requires strong discretion, advanced MS Office skills, and the ability to handle tight deadlines in a fast-paced environment.

Qualifications

• 5+ years in progressive administrative roles with leadership responsibilities.
• Strong discretion with sensitive information.
• Proficient in Word, Excel, PowerPoint, Outlook.
• Able to manage complex projects and meet tight deadlines.

Responsibilities

• Maintain documents per recordkeeping requirements.
• Prepare travel authorizations and coordinate travel arrangements.
• Monitor qualifications and ensure compliance/maintenance.
• Support onboarding activities for new staff.
• Schedule performance appraisals and prepare personnel records.
• Prepare reports and presentations for senior leadership.
• Provide office management support (phones, visitors, calendars).
• Triage inquiries promptly and professionally.
• Distribute mail/faxes and handle sensitive items appropriately.
• Manage office supplies and inventory within budget.
• Coordinate facility/equipment needs and maintenance.
• Serve as admin SME for action tracking/AR processes; close items.
• Maintain department SharePoint site and search for improvements.
• Initiate contract requisitions/changes and funding coordination.

Skills

Discretion

Communication

Organization

Time management

Independent decision-making

Attention to detail

Education

High school diploma or GED

Tools

MS Office

SharePoint

Access

Job description

Administrative Assistant III

Industry: Commercial Nuclear Power / Energy
Job Type: Contract
Location: Richland, WA (On-site)
Contract Duration: Approx. 6 months. Potential to extend and/or convert to permanent.
Schedule: 4 days/week, 10 hours/day (Mon–Thurs) | Approx. 40 hrs/week

Position Summary

Under minimal supervision, performs advanced, diversified, and confidential administrative duties. Provides day-to-day administrative support for department leadership and staff, including coordination with internal teams and external stakeholders.

Key Responsibilities

• Maintain documents in accordance with recordkeeping requirements.
• Prepare travel authorizations/expense forms and coordinate travel arrangements per established procedures.
• Monitor department personnel qualifications and ensure compliance/maintenance.
• Support onboarding activities for new staff (supplies, equipment, orientation).
• Schedule performance appraisals and prepare personnel-related paperwork/records.
• Prepare reports, correspondence, and presentations (including confidential materials) for audiences including senior leadership.
• Provide office management support (phones, visitors, meeting coordination, calendars).
• Triage and route inquiries (including a must-answer line) promptly and professionally.
• Distribute and monitor mail/faxes; elevate sensitive items appropriately.
• Manage office supplies and inventory; place orders within budget/approval.
• Coordinate facility/equipment needs (furniture, printers, work orders).
• Serve as an administrative subject matter expert for action tracking / AR processes; generate and track items to closure.
• Maintain department SharePoint site.
• Initiate contract requisitions/changes; coordinate annual contract funding.
• Serve as credit card custodian; reconcile monthly billing.
• Register staff for training.
• Other duties as assigned.

Required Skills & Qualifications

• High school diploma or GED.
• Minimum 5 years of progressive administrative experience, including independent decision-making and leadership responsibilities.
• Strong discretion and professionalism with sensitive/confidential information.
• Proficiency with Microsoft Office (Word, Excel, PowerPoint, Outlook; Access preferred).
• Strong organization, planning, time management, and attention to detail.
• Ability to manage complex projects and work under pressure/tight deadlines.
• Excellent written and verbal communication skills; strong interpersonal skills.

Additional Requirements

• U.S. Citizenship required.
• No remote work (on-site role).