Bookkeeper Mahwah NJ IT Company; In-Office

Delaney Computer Services (DCS) is a Northern New Jersey–based Managed IT Services Provider serving small and mid-sized businesses throughout the New York Metro area. We deliver managed IT, cybersecurity, cloud, and professional services to clients who depend on us to keep their businesses operational and secure.

We are seeking a detail-oriented Bookkeeper to join our team and support our financial and billing operations. This is an opportunity to join a stable, growing company where accuracy, organization, and accountability are highly valued.

This is an in-office position in Mahwah, NJ. Remote candidates will not be considered.

The Bookkeeper is responsible for maintaining accurate financial records, supporting invoicing and billing processes, and ensuring that financial data remains organized and up to date.

Our environment includes recurring services, project-based work, vendor expenses, and contract-based billing. While deep MSP experience is not required, the right candidate should be comfortable working in a structured, detail-driven environment and able to understand how billing aligns with services and agreements.

You will also assist with internal coordination and may communicate with clients when questions arise, so professionalism and clarity are important.

• Manage and process monthly recurring service agreement (MSA) billing
• Invoice project-based and transactional work (hardware, software, renewals, domains, etc.)
• Reconcile vendor invoices and licensing to client agreements
• Maintain billing accuracy within Quick Books Online
• Audit contracts and ensure billing aligns with contract terms
• Resolve billing discrepancies proactively
• Communicate directly with clients regarding invoice questions, service relationships, and contract terms
• Identify when issues require escalation to management and when they can be handled independently
• Continuously improve billing processes and documentation

• Someone who is organized, detail-oriented, and reliable

• Comfortable working in a structured, professional environment
• Able to manage multiple tasks and stay on top of priorities
• A clear communicator who can work with internal staff and, when needed, clients
• Someone who takes ownership of their work and follows through. This is not a passive administrative role. It requires ownership, judgment, and professionalism.

• Experience using Quick Books Online
• Experience with Various Quick Books Desktop Versions
• Prior bookkeeping or accounting support experience
• Demonstrated ability to understand contract-based billing
• Experience with recurring revenue models
• Strong written and verbal communication skills
• Close attention to detail and process discipline
• Comfortable working in an office environment full-time
• Ability to work independently and take ownership of outcomes
• Willingness to learn

• 2+ years of billing / bookkeeping experience in a professional services firm
• Strong working knowledge of Quick Books Online
• Understanding of licensing, cloud subscriptions, and vendor reconciliation
• Experience explaining invoices to small business owners
• Familiarity with service agreements and contract structures

• Competitive salary based on experience
• Health, dental, and vision benefits
• 401(k) with company match
• Paid time off
• Long-term growth opportunity within a stable MSP