Office Administrator​/Bookkeeper

Office Administrator / Bookkeeper

Guardian Security Services, Inc. | Blue Island, IL

Pay: Commensurate with experience

Position: Full-Time | On-Site

Hiring: Immediate Opening

Guardian Security Services, Inc. is seeking a highly organized, motivated, and detail-oriented Office Administrator / Bookkeeper to work closely with company leadership and support the daily administrative and bookkeeping functions of our business. This is a hands‑on administrative position with an emphasis on bookkeeping, financial recordkeeping, and general office operations. Responsibilities will include maintaining accurate financial records, processing accounts payable, assisting with payroll and billing activities, preparing documents and reports, and providing administrative support to management.

The ideal candidate is dependable, proactive, professional,

and comfortable managing multiple responsibilities in a fast‑paced office environment. Strong organizational skills, attention to detail, discretion, and the ability to communicate effectively with employees, clients, and management are essential. We are looking for someone who takes initiative, enjoys keeping an office organized and running efficiently, and takes pride in producing accurate, high‑quality work.

Good Business Is About Making Smart Investments. At Guardian Security, We Invest In People!

Guardian Security Services is a family‑owned company with more than 50 years of experience providing professional security services. We believe our employees are our most important assets, and we are committed to building a supportive workplace where people are valued, respected, and recognized for their contributions. Our success is built on strong relationships, teamwork, accountability, and finding the right people to support our clients and our business.

• Competitive hourly compensation based on experience.
• Health, dental, and vision insurance.
• Paid time off.
• IRA retirement plan.
• A supportive, team‑oriented work environment.
• The opportunity to work directly with company leadership and contribute to the continued success of an established business.

• Maintain accurate and organized financial records.
• Process accounts payable, including reviewing, coding, and entering invoices and preparing payments.
• Assist with accounts receivable, client billing, invoicing, deposits, and payment tracking.
• Assist with maintaining the general ledger and performing bank and account reconciliations.
• Maintain accurate employee wage rates, client billing rates, and related financial records.
• Assist with financial reports, budgets, proposals, and other management reporting.
• Maintain organized documentation for financial transactions and accounting records.
• Assist with payroll processing, employee deductions, wage garnishments, and related recordkeeping in coordination with other team members.
• Assist with payroll tax documentation, required filings, and year-end reporting as needed.

• Provide day‑to‑day administrative support to company leadership.
• Prepare, format, and maintain business correspondence, proposals, budgets, reports, and other documents.
• Communicate professionally with clients, employees, vendors, and management.
• Maintain organized electronic and physical filing systems.
• Handle confidential employee, financial, and company information with discretion and sound judgment.
• Assist with employee benefit records and related administrative documentation.
• Maintain business insurance records and assist with insurance audits, including general liability, workers' compensation, umbrella, and automobile coverage.
• Assist with data entry, document…