Billing Specialist

Job Title: Billing Specialist

Job Description

This role is ideal for an experienced billing specialist who thrives in a fast-paced, audit-driven environment and is highly skilled in complex contract billing. You will take ownership of billing execution for assigned programs, preparing accurate invoices, validating cost data, supporting audits, and ensuring strict compliance with contract terms and applicable accounting and billing regulations. Your work will directly support cash flow, contribute to overall financial health, and help maintain strong relationships with key customers. You will work across multiple contract types and industries, handling high-volume billing cycles while maintaining precision and audit-ready documentation.

Responsibilities

• Prepare and submit invoices for a variety of contract types, including Cost-Reimbursable, Time & Materials (T&M), Firm Fixed Price (FFP), Milestone-Based, Progress Payment, and Performance-Based agreements.

• Ensure all invoices fully comply with contract requirements, billing terms, and applicable accounting and billing regulations.

• Review and validate billed costs for accuracy, allowability, and alignment with contractual terms and cost principles.

• Reconcile billed amounts to project financial reports, Project Cost Reports, general ledger (GL) data, and other supporting documentation.

• Maintain and update billing schedules, billing matrices, project setup checklists, and contract-specific billing calendars.

• Prepare detailed invoice packages, including all required supporting documentation, for internal review, customer submission, and audit purposes.

• Manage high-volume billing cycles, typically handling approximately 150–250 billings per week, while meeting strict monthly deadlines.

• Assist with monthly billed and unbilled accounts receivable reconciliations to ensure accurate reporting of revenue and receivables.

• Partner with accounting teams to resolve cash application discrepancies and ensure timely and accurate posting of payments.

• Support collection efforts for outstanding customer balances by providing billing detail, resolving disputes, and coordinating with internal stakeholders.

• Maintain organized, audit-ready billing documentation, including invoice archives, billing schedules, and contract billing records.

• Prepare complete invoice support packages for internal and external auditors, ensuring all documentation is clear, accurate, and compliant.

• Follow established billing procedures, internal controls, and compliance requirements to minimize risk and ensure consistency.

• Collaborate closely with contracts, program and project management, finance, pricing, and operations teams to ensure accurate billing setup and execution.

• Resolve billing issues related to contract modifications, funding changes, collections, and revenue configuration in a timely and professional manner.

• Support contract closeout activities by confirming final billing, reconciliations, and documentation are complete and accurate.

• Provide input on process improvements and support system enhancements to increase efficiency, accuracy, and control in billing operations.

• Leverage advanced Excel skills and reporting tools to analyze billing data, perform reconciliations, and generate billing-related reports.

• Contribute to a culture of continuous improvement by identifying opportunities to streamline workflows and strengthen internal controls.

Essential Skills

• 1–3+ years of billing experience, ideally within complex contract environments such as government, aerospace/defense, manufacturing, or medical billing.

• Strong expertise in ERP systems, including billing modules and their interactions with general ledger (GL) and project ledger (PL), as well as reporting and project setup functionality.

• Proven experience preparing detailed invoice packages that include all required supporting documentation.

• Working knowledge of standard billing requirements, cost principles, and compliance frameworks relevant to complex contract billing.

• Strong reconciliation, analytical, and problem-solving skills, with the ability to validate costs against Project Cost Reports, GL data, and other financial records.

• Demonstrated ability to manage high-volume billing cycles with strict monthly deadlines while maintaining accuracy and compliance.

• Experience supporting internal and external audits and producing complete, well-organized billing documentation.

• Advanced proficiency in Microsoft Excel, including the ability to work with large data sets, perform complex reconciliations, and generate reports.

• Familiarity with reporting tools, contract lifecycle systems, or data warehouse environments used to support billing and financial reporting.

• Experience preparing and submitting invoices for multiple contract types, including Cost-Reimbursable, T&M, FFP, Milestone-Based, Progress Payment, and Performance-Based arrangements.

• Ability to maintain organized, audit-ready invoice archives, billing schedules, and contract billing records.

Job Type & Location

This is a Contract to Hire position based out of Sparks, NV.

Pay and Benefits

The pay range for this position is $20.00 - $23.00/hr.

Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may be subject to specific elections, plan, or program terms. If eligible, the benefits available for this temporary role may include the following: • Medical, dental & vision • Critical Illness, Accident, and Hospital • 401(k) Retirement Plan – Pre-tax and Roth post-tax contributions available • Life Insurance (Voluntary Life & AD&D for the employee and dependents) • Short and long-term disability • Health Spending Account (HSA) • Transportation benefits • Employee Assistance Program • Time Off/Leave (PTO, Vacation or Sick Leave)

Workplace Type

This is a fully onsite position in Sparks,NV.

Application Deadline

This position is anticipated to close on Jul 24, 2026.

About Aston Carter

Aston Carter provides world-class corporate talent solutions to thousands of clients across the globe. Specialized in accounting, finance, human resources, talent acquisition, procurement, supply chain and select administrative professions, we extend the capabilities of industry-leading companies. We draw on our deep recruiting expertise and expansive network to meet the evolving needs of our clients and talent community with agility and excellence. With offices across the U.S., Canada, Asia Pacific and Europe, Aston Carter serves many of the Fortune 500. We are proud to be a ClearlyRated Best of Staffing® Platinum Award winner for both client and talent service.

The company is an equal opportunity employer and will consider all applications without regard to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.

If you would like to request a reasonable accommodation, such as the modification or adjustment of the job application process or interviewing process due to a disability, please email View email address on click.appcast.io (%View email address on click.appcast.io) for other accommodation options.

San Francisco Fair Chance Ordinance: Pursuant to the San Francisco Fair Chance Ordinance, for all positions located in the city and county of San Francisco, we will consider for employment qualified applicants with arrest and conviction records.

Massachusetts Lie Detector: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.

Use of Artificial Intelligence (AI): We may use Artificial Intelligence (AI) to support parts of our hiring process, including sourcing, screening, and evaluating candidates. AI helps assess applications and qualifications, but final decisions are made by our hiring team. By applying, you acknowledge and agree that your application may be reviewed using AI tools.