Senior Accounts Receivable Specialist

Location: Escondido, CA (On-Site)
Department: Accounting & Finance
Reports To: Controller
Employment: Full-Time, Non-Exempt

About MARS Builder Solutions

MARS Builder Solutions partners with residential homebuilders to deliver high-quality roofing and solar solutions throughout new construction communities. We are committed to exceptional customer service, operational excellence, and building long-term relationships with our builder partners.

As we continue to grow, we are seeking an experienced Senior Accounts Receivable Specialist to support our roofing operations and play a key role in managing the full order-to-cash cycle.

This position is ideal for an accounting professional who enjoys taking ownership of billing, collections, and customer account management while working closely with operations, project managers, and leadership. If you have experience in construction, roofing, or a project-based environment and thrive in a fast-paced setting, we'd love to hear from you.

Essential Duties & Responsibilities

Customer Billing & Invoice Management

• Generate and issue customer invoices through NetSuite based on completed work, contract milestones, schedules of values, and approved change orders
• Prepare progress billings and AIA-style pay applications
• Track retention balances and retention releases
• Validate billing against contract requirements and customer agreements
• Submit invoices through customer and general contractor billing portals
• Ensure all required supporting documentation is attached, including lien waivers, compliance documents, photos, sign-offs, and certified payroll records
• Monitor unbilled work and change orders to ensure timely revenue capture

Cash Application & Reconciliations

• Apply ACH, wire, and check payments accurately and timely within NetSuite
• Research and resolve short pays, overpayments, unapplied cash, and billing discrepancies
• Process credit memos, write-offs, and billing adjustments in accordance with company policies
• Reconcile Accounts Receivable activity to the General Ledger and bank deposits
• Support month-end close activities and reporting requirements

Collections & Customer Account Management

• Manage aging and collections for assigned homebuilder, general contractor, and retail customer accounts
• Conduct proactive collection calls and email follow-up
• Partner with project managers and operations teams to resolve payment disputes
• Escalate delinquent accounts and collection risks to leadership
• Prepare and monitor California preliminary notices, lien waivers, and related documentation
• Coordinate mechanic's lien and bond claim filings within required deadlines
• Maintain thorough collection notes and account records within NetSuite

Reporting & Process Improvement

• Participate in Accounts Receivable review meetings with Finance and Operations
• Maintain accurate customer master records and billing information
• Help improve invoicing, collections, and cash application processes
• Assist with documenting and maintaining Accounts Receivable procedures

Required Qualifications

• 5+ years of Accounts Receivable experience
• Strong experience with invoicing, cash application, collections, and account reconciliations
• Demonstrated success managing a high-volume aging portfolio
• Advanced Excel skills including pivot tables, lookups, and account analysis
• Strong understanding of Accounts Receivable Accounting Principles and General Ledger impact
• Excellent communication and relationship-building skills
• Ability to prioritize competing deadlines and work effectively during month-end close

Preferred Qualifications

• Experience in roofing, solar, construction, homebuilding, or other project-based industries
• NetSuite ERP experience
• Knowledge of schedules of values, retention, WIP reporting, and change order billing
• Familiarity with AIA billing and construction payment platforms such as Procore, Textura, FullClarity, or GCPay
• Knowledge of California preliminary notices, lien waivers, mechanic's liens, and bond claims
• Experience supporting multi-entity organizations
• Associate or Bachelor's degree in accounting, Finance, Business, or related field
• Bilingual English/Spanish preferred

Physical Requirements

• Ability to remain seated and work at a computer for extended periods.
• Occasional travel to builder offices, jobsites, or company locations as needed.
• Ability to occasionally lift and carry office materials weighing up to 20 pounds.

Work Environment 

This is an on-site position located in our Escondido, California office. The role is primarily office-based and requires extended periods of computer work. Standard business hours apply, with occasional additional hours needed during month-end close and other peak accounting periods.

Benefits

• Medical, Dental, and Vision Insurance
• Company-Paid Life Insurance
• 401(k) with Company Match
• Paid Time Off and Sick Time
• Six Paid Company Holidays
• Cell Phone Reimbursement
• Opportunities for career growth and advancement