Billing Clerk/Administrative Assistant

National Mechanical is seeking a detail-oriented Billing Clerk/Administrative Assistant to support billing functions and provide general administrative support to our operations team. This role is responsible for accurate invoicing, organized recordkeeping, and day-to-day administrative assistance in a fast-paced service environment.

Primary Responsibilities

• Prepare and process customer invoices, including progress billing and change notices
• Review work orders and documentation to ensure billing accuracy and completeness
• Perform basic accounts payable tasks, including invoice entry and assisting with check processing
• Monitor open work orders and support timely month-end and year-end billing close
• Research and resolve billing or payment discrepancies
• Support operations with administrative and project-related tasks
• Maintain and update multiple data-tracking spreadsheets
• Provide general administrative support to the operations team
• Provide backup support to dispatch by answering phones and assisting customers
• Perform other related duties as assigned

• 1–2 years of billing and/or administrative experience preferred
• Experience in a service, construction, or trade environment is an asset
• Proficient in Microsoft Office, particularly Excel and Word
• Experience working with billing or accounting systems preferred
• Familiarity with basic accounting principles is beneficial
• Strong attention to detail and organizational skills
• Ability to manage multiple tasks and meet deadlines
• Clear, professional communication and a team-oriented, dependable work style