Senior Accounts Receivable Associate

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

Benefits offered by this job

Medical, dental and vision plans

401(k) plan with company match

ESPP

Wellness program

Tuition reimbursement

Paid time off

Performance or safety bonus program

Job summary

Matrix Service Company in Tulsa, OK is seeking a Sr. Accounts Receivable Associate to manage complex EPC billing—milestones, T&M, unit-price—and collaborate with project management, engineering, procurement and accounting to support order-to-cash performance.

The role emphasizes enforcing contract terms, accurate invoicing, collections, and AR outcomes across the full project lifecycle, including aging analysis and DSO improvements.

Qualifications

• 4+ years' general accounting and/or accounts receivable experience.
• Strong construction industry experience.
• Understanding of contract types (Lump Sum, AIA, T&M, Cost Plus, Unit Price) and invoicing.
• Knowledge of accounting procedures; Sales/Use tax.
• Excel and Outlook proficiency; familiar with PENTA or Access a plus.
• Excellent organizational, analytical, and written skills; self-motivated.

Responsibilities

• Manage complex AR processes including cash application, posting, and reconciliation.
• Invoice according to contract terms and collect on overdue accounts.
• Support month-end percent complete and project status reporting.
• Coordinate with project management, engineering, procurement, and accounting teams to validate billings.
• Administer change orders, amendments, and addenda for accurate billing.
• Prepare AR reporting and variance analysis; drive DSO improvements.

Skills

Accounts Receivable

Excel

Analytical Thinking

Communication

Cross-functional Collaboration

Education

Bachelor's degree in Accounting or related field

Tools

PENTA

Access

Job description

Job Summary

The Sr. Accounts Receivable Associate manages complex EPC billing processes such as milestone, unit-price, and timeandmaterials billing. The position partners closely with project management, engineering, procurement, and accounting teams to support ordertocash 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.

Follow us at Matrix Service Company to view all of our open positions and for the latest news about our operating companies and our teams.

• 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.

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.