Accounts Receivable Specialist in Milwaukee, Wisconsin at Sigma Commercial LLC

Accounts Receivable Specialist
Sigma Commercial LLC | Milwaukee, WI (East Side) | Full-Time | On-Site

About Us

Sigma Commercial is a Milwaukee-based holding company. Our shared back office supports four operating businesses: LaBonte Construction (luxury residential remodeling), Property Prep (commercial maintenance and janitorial), Vandelay Group (residential property management), and Sigma Commercial itself. We're a small, hands-on team in a casual, practical environment where the work is varied and your impact is visible.

The Role

We're looking for an Accounts Receivable Specialist to own billing, cash application, and collections across our companies. Each business bills differently: project-based invoicing for remodeling work, recurring contract billing for commercial services, and rent and fee tracking for residential properties. You'll keep all of it accurate, current, and collected. This is an individual-contributor role for someone who is detail-oriented, comfortable following up on past-due accounts, and able to switch between entities without losing track.

What You'll Do

-Prepare and send customer invoices across all entities, including project-based billing, deposits, and change orders for LaBonte Construction and recurring monthly service billing for Property Prep
-Post and reconcile incoming payments (checks, ACH, credit card) to the correct entity, customer, and invoice
-Track tenant rent, fees, and security deposits for Vandelay Group properties and flag delinquencies
-Monitor AR aging reports and follow up on past-due balances by phone and email, escalating when needed
-Maintain accurate customer records, billing terms, and contact information
-Resolve billing discrepancies and customer questions professionally and quickly
-Prepare regular AR reports and cash collection summaries for leadership
-Support month-end close with AR reconciliations and accruals
-Record intercompany billing between entities
-Work closely with the Accounts Payable Specialist and project and operations teams to ensure billing matches work performed

What You Bring

-[2+] years of accounts receivable, billing, or collections experience
-Working knowledge of [QuickBooks / accounting software]
-Strong Excel skills (filters, lookups, basic pivot tables)
-High attention to detail and comfort working with numbers all day
-Confidence making collection calls and holding customers to payment terms while keeping relationships positive
-Ability to manage multiple entities, deadlines, and priorities without dropping details
-Clear written and verbal communication

Nice to Have

-Experience with construction billing (progress billing, draw schedules, retainage)
-Experience with property management software or rent collection
-Multi-entity accounting experience
-Associate degree or coursework in accounting or business