Accounts Receivable Specialist

**IGY SIX Consulting** is recruiting on behalf of our client, Vertex Security, a well\-established New York City security integrator. This is a direct\-hire position with Vertex Security. We are seeking an Accounts Receivable Specialist to own billing, collections, payment application, and account accuracy across QuickBooks Online and Vertex’s CRM systems. You’ll follow up with customers, resolve discrepancies, keep records and reporting current, and work with a remote assistant who supports the day\-to\-day legwork. The right person is organized, persistent, and comfortable figuring out unfamiliar issues without waiting for step\-by\-step instructions. Your work will help Vertex keep receivables moving and customer accounts accurate as the business grows. **About Vertex Security** Vertex Security is a New York City\-based B2B security integrator serving commercial clients with access control, video surveillance, intercom, intrusion, and related low\-voltage systems. The team values accountability, responsiveness, quality, and customer service. **About the Role** Own day\-to\-day accounts receivable for a growing service business. You will manage billing, collections, payment application, and account accuracy across QuickBooks Online and two CRM systems. A full\-time remote assistant supports the legwork, while you remain accountable for priorities, follow\-through, and reliable reporting. **What You Will Do** * Generate accurate invoices and manage recurring, subscription, license, and project\-related customer billing. * Monitor aging, follow up consistently on outstanding balances, document commitments and disputes, and escalate issues when needed. * Apply payments, investigate discrepancies, and keep cash receipts and reconciliations current in QuickBooks Online. * Keep customer contacts, billing details, and account changes aligned across QuickBooks and CRM systems. * Organize a high\-volume portfolio of small and large invoices; set weekly priorities and provide clear AR and collections updates. * Coordinate the remote assistant’s work, answer customer billing questions, and handle occasional office administration such as mail, account applications, and business inquiries. * Research unfamiliar issues, use available resources and outside advisors appropriately, and recommend a practical next step. **What You Bring** * At least 2 years of B2B accounts receivable, billing, collections, bookkeeping, or related accounting experience. * Hands\-on QuickBooks Online experience with invoicing, payment application, reconciliation, and reporting. * Experience keeping accurate records across accounting and CRM systems. * Strong written and verbal English communication, organization, attention to detail, and persistent follow\-through. * Ability to investigate new questions independently and take ownership without waiting for step\-by\-step direction. **Preferred Experience** * Experience in security systems, construction, field services, o