Accounting Assistant - Accounts Payable

Location: La Jolla, California
Employment Type: Full-Time
Work Arrangement: 100% Onsite — this is not a remote or hybrid position

We are seeking a dependable and detail-oriented Accounts Payable Associate / Accounting Assistant to support day-to-day accounting operations in our La Jolla office. This role is primarily responsible for accounts payable processing, bank and credit card reconciliations, and basic bookkeeping functions. The ideal candidate has experience handling transactional accounting tasks, maintaining accurate records, and working independently within assigned responsibilities.

This position is well suited for someone with strong organizational skills, basic accounting knowledge, and experience supporting client bill pay and accounting.

We’re also building the team of the future. That means this role is expected to be comfortable with technology and willing to learn and use automation and AI agents to reduce manual work, increase accuracy, and speed up turnaround times

• Payments, reconciliations, and supporting documentation are accurate and on time.
• Client records (vendors, notes, documents, approvals) are kept clean and current.
• You follow standardized workflows so the work is consistent and auditable.
• You help us automate: you use tools and agents, spot repeatable tasks, and suggest better ways to do the work.

• Review and process vendor invoices accurately and timely
• Verify invoice coding, approvals, and supporting documentation
• Enter invoices into the accounting system
• Prepare and process check, ACH, and electronic payments
• Maintain vendor files and records
• Respond to vendor inquiries and resolve routine payment issues
• Assist with maintaining AP aging and payment schedules

• Perform monthly bank account reconciliations
• Reconcile company credit card transactions and statements
• Research and resolve basic discrepancies and missing transactions
• Maintain accurate financial records and supporting documentation
• Assist with account coding and expense tracking

• Assist with data entry and bookkeeping activities
• Support month-end close preparation and documentation
• Prepare basic journal entries as assigned
• Maintain organized accounting files and records
• Assist with administrative accounting tasks and reporting

• 1–3 years of accounts payable, bookkeeping, or accounting support experience
• Experience with bank and/or credit card reconciliations
• Basic understanding of accounting principles and general ledger coding
• Experience with accounting software and Microsoft Excel
• Strong attention to detail and organizational skills
• Ability to manage routine tasks independently and meet deadlines

• Associate degree or coursework in Accounting or Bookkeeping
• Experience with Quick Books or similar accounting software
• Experience in small business accounting environments

• Bank reconciliations
• Credit card reconciliations
• Organization and time management
• Communication and follow-up
• Confidentiality and professionalism

Plumb provides bill pay, accounting, reporting, and financial administration services to high-net-worth individuals, families, and their advisors. Our clients entrust us with highly sensitive financial information and important financial responsibilities.

We are building a highly professional, technology-enabled operating organization that combines excellent people, strong controls, modern technology, and exceptional client service.

This position will play an important role in developing and leading our growing onsite operations team in La Jolla.