Accounts Receivable Associate

Matrix Service Company; Tulsa (OK); On-site; USD 65,000 - 90,000; Full time

Benefits offered by this job

Medical benefits

Dental and vision

Disability benefits

Life and AD&D

401(k) with company match

Employee stock purchase plan

Wellness program

Tuition reimbursement

Paid time off

Performance bonus

Job summary

Matrix Service Company in Tulsa, OK seeks a Sr. Accounts Receivable Associate to manage complex EPC billing processes, including milestone, unit-price, and time-and-material billing.

You will partner with project management, engineering, procurement, and accounting teams to support order-to-cash performance and drive accurate invoicing and collections across the full project lifecycle. The role requires 4+ years of AR experience in a construction/ EPC environment, strong contract knowledge, and

Qualifications

• 4+ years’ general accounting and/or accounts receivable experience.
• Strong construction industry experience.
• Extensive knowledge of contract types (Lump Sum, AIA, T&M, Cost Plus and Unit Price).
• Experience with invoicing, cash applications, and AR reporting.
• Proficient with Excel and Outlook.

Responsibilities

• Manage complex EPC billing processes including milestone, unit-price, and time‑and‑materials billing.
• Invoice in compliance with contract terms and conditions.
• Monitor AR aging, collect past due invoices, and report results.
• Prepare AR reports and provide actionable insights for management.
• Collaborate cross-functionally with project management, engineering, procurement, and accounting teams.

Skills

Accounts receivable

Billing accuracy

Excel proficiency

Cross-functional collaboration

Education

Bachelor's degree in Accounting or related field

Tools

PENTA/Access

Job description

The Sr. Accounts Receivable Associate manages complex EPC billing processes such as milestone, unit-price, and time‑and‑materials billing. The position partners closely with project management, engineering, procurement, and accounting teams to support order‑to‑cash performance, enforce contract terms (e.g., retainage, payment schedules), and drive accurate invoicing, collections, and AR outcomes across the full project lifecycle.

This role will be filled in our Tulsa, OK location.

Essential Functions

• Actively supports the Company’s commitment to safety and its “Core Values”.
• Represents the Company at all times with high moral standards while adhering to the Company’s “Code of Business Conduct and Ethics”.
• Obtain an understanding of the setup of new job numbers based on OU (LS, T&M, AIA & Parent/Child) and cost code structures in relation to the customer’s invoicing requirements.
• Review job contracts and document invoicing procedures.
• Efficiently and accurately invoice Owner in compliance with contract agreements.
• Invoicing utilizing Owner systems. (CCM, CMS, E-Payables, Track, etc.)
• Assist with month end percent complete process.
• Support Project Managers with reports and job status analysis.
• Facilitate internal audit of projects as requested.
• Analyze weekly CIE/BIE report and provide feedback on potential issues.
• Manage customer aging report, follow up with customers and Project Managers with past due invoices and report results to Manager of Project Administration.
• Manage and execute multiple billing methodologies, including progress (percentage-of-completion), time & materials (T&M), unit-price, and milestone billing, ensuring accuracy and compliance with contract terms.
• Validate billable work by coordinating cross-functionally with project management, engineering, procurement, and accounting teams to confirm alignment with approved work packages, purchase orders, and contracts.
• Interpret and apply complex contract terms and payment provisions, including payment schedules, retainage clauses, liquidated damages, and back-charge provisions.
• Administer and process change orders, contract amendments, and addenda, ensuring accurate billing adjustments and proper documentation.
• Perform accounts receivable (AR) operations, including cash application, payment posting, and reconciliation of customer accounts.
• Monitor and analyze AR aging, identify delinquent accounts, and support credit review and escalation processes.
• Drive improvements in Days Sales Outstanding (DSO) through proactive collection and process optimization efforts.
• Prepare and deliver monthly and quarterly AR reporting, including variance analysis and actionable insights.
• Process and manage lien waivers (conditional and unconditional) in compliance with contractual and legal requirements.
• Support and ensure alignment with procure-to-pay (P2P) and order-to-cash (O2C) processes across project lifecycles
• Perform other duties as required or assigned.

Qualifications

• 4+ years’ general accounting and/or accounts receivable experience.
• Strong construction industry experience required.
• A strong understanding of contracts and hands‑on experience issuing Lump Sum, AIA, Time & Material, Cost Plus and Unit Price invoices required.
• Demonstrated knowledge of accounting procedures; knowledge of Sales/Use tax.
• Computer proficiency, including Excel, Outlook; experience with PENTA or Access a plus.
• Excellent organizational, analytical, and written skills required; must be a self‑motivated individual.
• Detail oriented; must have the ability to prioritize work, analyze information, identify discrepancies and meet deadlines.
• Experience in project‑based billing and accounts receivable within an EPC, construction, or engineering environment.
• Strong understanding of engineering deliverables, procurement schedules, and construction project phases.
• Advanced knowledge of contract structures, billing terms, and payment conditions in complex project environments.
• Demonstrated ability to work cross‑functionally with project, technical, and operational stakeholders.
• Advanced proficiency in Microsoft Excel, including Pivot tables and VLOOKUP.
• Effective communication skills with the ability to present information clearly to both financial and non‑financial stakeholders.
• Strong customer service mindset and approach to business.

In addition, full‑time employees are offered a comprehensive benefits package, including medical, dental and vision plans covering eligible employees and dependents, disability benefits, life and AD&D insurance, an employee assistance program (EAP), a 401(k) plan with company match, an employee stock purchase plan (ESPP), a robust wellness program and adoption assistance. Some employees may also be eligible for paid time off, tuition reimbursement and a performance or safety bonus program.

At Matrix, we are dedicated to building a culture of engagement, respect, collaboration and teamwork. We encourage all whose experience aligns with the listed qualifications to apply and explore joining our organization.

EEO/M/F/Disability/Vets Employer

We are an Equal Opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, national origin, age, genetic information, marital status, disability, veteran status, or other legally protected characteristic or category.

Applicants must be currently authorized to work in the United States on a full‑time basis.

Equal Opportunity Employer

This employer is required to notify all applicants of their rights pursuant to federal employment laws.

For further information, please review the Know Your Rights notice from the Department of Labor.