Senior Accountant

Join One of the Fastest-Growing Companies in Government Services!

At ISN Corporation, headquartered in Bethesda, Maryland, we deliver specialized professional services to over 100 federal government agencies. We have been recognized on the Washington Business Journal’s list of 50 Fastest Growing Government Contractors and the Inc. 5000 list of Fastest Growing Private Companies.

We’re building something great.

Why You’ll Love Working at ISN:

We believe great work starts with a great workplace. Here’s what we offer to support you:

• Comprehensive medical coverage with prescription benefits
• Dental plan to keep you smiling
• Flexible spending accounts for smarter saving
• Company-paid short- and long-term disability insurance
• Free basic life insurance—because we’ve got your back
• Solid retirement plan to help you plan ahead
• Paid time off starting on Day 1

Who We’re Looking For:

You’re organized, energetic, and ready to make an impact. You thrive in fast-paced environments, love checking things off your to-do list, and can juggle multiple priorities without breaking a sweat. Most importantly, you bring a positive attitude and a problem‑solving mindset to everything you do.

If you’re a self-starter with an eye for detail and a passion for excellence, we’d love to meet you.

Mission. Innovation. Impact. Grow with us today!

We are seeking an experienced Senior Accountant with strong knowledge of Deltek Costpoint, payroll reconciliation, general ledger accounting, and ADP payroll systems. The ideal candidate will be responsible for maintaining accurate financial records, performing account reconciliations, supporting month-end and year-end close activities, and ensuring compliance with company policies and government contracting requirements. This position reports to our Bethesda, Maryland office at least 3 days a week.

• Maintain and reconcile general ledger accounts.
• Prepare and post journal entries accurately and timely.
• Perform monthly, quarterly, and annual account reconciliations.
• Assist with month-end and year-end close processes.
• Prepare financial reports and supporting schedules for management review.
• Research and resolve accounting discrepancies and variances.

• Reconcile payroll transactions between ADP payroll system and General Ledger.
• Review payroll registers for accuracy and completeness.
• Reconcile payroll taxes, deductions, benefits, and garnishments.
• Investigate and resolve payroll-related discrepancies.
• Support payroll audits and compliance reporting.
• Prepare payroll accruals and related journal entries.

• Utilize Deltek Costpoint for accounting, project setup, and financial reporting.
• Ensure proper project cost allocation and labor charging.
• Reconcile labor distribution and project accounting data.
• Support indirect rate calculations and government contract reporting.
• Assist with incurred cost submissions and DCAA compliance requirements.
• Maintain accounting system integrity and data accuracy within Costpoint.

• Support internal and external audits.
• Prepare audit schedules and supporting documentation.
• Ensure compliance with GAAP, company policies, and federal contracting regulations.
• Assist with implementation and maintenance of internal controls.

• Bachelor's degree in Accounting, Finance, or related field required.
• CPA or CPA candidate preferred.
• 10+ years of progressive accounting experience.
• Minimum 3 years of Deltek Costpoint experience.
• Experience with ADP payroll processing and payroll reconciliations.
• Government contracting experience strongly preferred.
• Experience working with DCAA-compliant accounting systems preferred.

• Advanced knowledge of Deltek Costpoint.
• Strong working knowledge of ADP Workforce Now or ADP payroll platforms.
• Excellent understanding of General Ledger accounting.
• Proficiency in Microsoft Excel, including Pivot Tables, VLOOKUP/XLOOKUP, and financial reporting.
• Knowledge of GAAP and financial statement preparation.

• Strong analytical and problem-solving skills.
• Excellent attention to…