Administrative Assistant — AR & Payroll Support

One-Source-Security; Merrimack (NH); On-site; USD 28,000 - 34,000; Full time

Benefits offered by this job

Medical insurance

Dental insurance

Vision insurance

401k with company match

Paid time off

Job summary

One Source Security in Merrimack, NH is seeking an Administrative Assistant to provide branch-wide support, handle phones, greet visitors, manage files, and assist with data entry, scheduling, and vendor coordination.

You will monitor customer accounts, follow up on past-due invoices, assist with accounts receivable reporting, process payroll time entries, and ensure time-entry accuracy while protecting confidential information.

Qualifications

• High school diploma or equivalent required.
• 2+ years of administrative/office experience.
• Proficiency with Microsoft Office (Word, Excel, Outlook).
• Strong organizational, communication, and time-management skills.
• Ability to manage multiple priorities in a fast-paced environment.
• Ability to handle confidential information with discretion.

Responsibilities

• Provide general administrative support to branch employees and management.
• Answer phones, greet visitors, and handle correspondence.
• Maintain accurate files and records; assist with data entry and scheduling.
• Order and manage office supplies; coordinate with vendors.
• Monitor customer accounts and follow up on outstanding balances.
• Contact customers regarding past-due invoices and document collection efforts.
• Assist with accounts receivable reporting and month-end processes.
• Collect, review, and enter employee time into the payroll system.

Skills

Microsoft Excel

Microsoft Word

Microsoft Outlook

Organizational skills

Communication skills

Time management

Education

High school diploma or equivalent

Tools

Payroll time-entry systems

Job description

One Source Security in Merrimack, NH is seeking an Administrative Assistant to provide branch-wide support, handle phones, greet visitors, manage files, and assist with data entry, scheduling, and vendor coordination.

You will monitor customer accounts, follow up on past-due invoices, assist with accounts receivable reporting, process payroll time entries, and ensure time-entry accuracy while protecting confidential information.