Job Locations US-VA-Chantilly
Job ID 2021-2378
# of Openings


REI Systems provides reliable, effective, and innovative technology solutions that advance federal, state, local, and nonprofit missions. Our technologists and consultants are passionate about solving complex challenges that impact millions of lives. We take a Mindful Modernization approach in delivering our application modernization, grants management systems, government data analytics, and advisory services. Mindful Modernization is the REI Way of delivering mission impact by aligning our government customers’ strategic objectives to measurable outcomes through people, processes, and technology. Learn more at 


Employees voted REI Systems a Washington Post Top Workplace in 2015, 2016, 2018, 2020, 2021 and 2022!


Reporting to the Accounting Manager, this position will perform a variety of technical and clerical accounting duties involving financial record keeping and/or transactions; specifically, the essential functions of the Accountant will be:


Accounts Receivable (AR) / Billing / Revenue Recognition

  • Prepare, review and submit monthly invoices to REI customers
  • Responsible for performing revenue recognition duties
  • Interact with internal and external stakeholders on project revenue, billing and unbillable
  • Conduct regular follow-ups with customers to ensure timely collection of receivables
  • Conduct regular receivables and unbillable reconciliations and provide reports as needed
  • Reconcile payments to pending Accounts Receivables (AR)
  • Enter and process cash receipts in Deltek Costpoint.

Other similar professional duties maybe assigned as needed


  • Minimum of four to five years of accounting work experience (required)
  • Prior experience working for Government contractor (required)
  • Prior experience in billing, invoicing and accounts receivable (required)
  • Knowledge and understanding of revenue recognition (required)
  • Prior recent work experience in Deltek Costpoint (required)
  • Prior experience and knowledge in contract closeout (preferred)
  • Prior knowledge and understanding of labor and timesheets (preferred)
  • Prior knowledge of using Cognos reporting tool or similar reporting tool (preferred)
  • Must be proficient in MS Office (Excel, Word, and Outlook)


Bachelor’s degree in Accounting or related field is required


The essential functions of this position require that the employee performing this role work on-site at REI’s Sterling location. In light of the ongoing COVID-19 pandemic, and as part of our continued efforts to maintain a safe workplace for employees, visitors, and customers, the individual holding the Administrative Assistant position must be fully vaccinated, as defined in CDC guidance, as a condition of continued employment. REI will consider requests to be excused from this policy whenever necessary to comply with legal requirements and will consider any requests for reasonable accommodations due to a disability, religion, or other exemptions on an individual basis in accordance with applicable legal requirements. Employees and applicants requesting accommodations should request the accommodation in writing and should explain in detail the reasons why they are seeking an accommodation. REI will request additional information or documentation it deems necessary to inform its decision on an employee’s or applicant’s accommodation request.


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