Office Assistant – Construction

Position Summary

We are a growing construction company based in the Concord/Martinez area looking for an energetic, focused, and driven Office Assistant to support the business at every level. This is a true catch-all role: one day you may be processing payroll in ADP and reconciling accounts, the next you may be at the bank, picking up supplies, or tracking down a missing lien release from a subcontractor.

The right person is accurate with numbers, comfortable juggling many moving parts, and brings a positive attitude to the office every day. If you like variety, take ownership of your work, and want to be the person the whole team relies on, we want to hear from you.

Location: Concord/Martinez, CA (on-site, office based) Reports to: Owner / Office Manager Employment type: Full-time

Key Responsibilities

• Process payroll through ADP and keep employee records current
• Handle accounts payable and accounts receivable, including invoicing, payments, and follow-up on outstanding balances
• Manage banking: deposits, transfers, check runs, and payments on accounts
• Prepare and track subcontracts, change orders, and conditional/unconditional lien releases
• Keep Monday.com up to date with job status, tasks, and deadlines
• Order office and job-site supplies and run errands: bank, post office, suppliers, pickups and drop-offs
• Answer phones and emails, maintain organized files, and support the owner and field team wherever needed

Required Qualifications

• 2+ years of office, bookkeeping, or administrative experience, preferably in construction or trades
• Hands-on experience running payroll in ADP
• Working knowledge of Monday.com (or similar project management platform) and willingness to become the office expert
• Strong with numbers: accurate data entry, basic accounting, and attention to detail are non-negotiable
• Experience with accounts payable, accounts receivable, and basic banking
• Familiarity with subcontract agreements and conditional/unconditional lien releases
• Proficient in Microsoft Office or Google Workspace, especially Excel/Sheets
• Valid driver's license, reliable vehicle, and clean driving record (errands are part of the job)
• Able to communicate clearly and professionally with vendors, subcontractors, customers, and crew

Preferred Experience

• Prior work in a general contractor, subcontractor, or construction office
• QuickBooks or similar accounting software
• Certified payroll, prevailing wage, or union reporting
• Preliminary notices, mechanics lien processes, and job-cost tracking
• Bilingual English/Spanish is a plus

Who You Are

• Positive attitude: mandatory. You bring energy to the office and handle the unexpected with a smile.
• Accurate. You double-check your numbers because you know a small mistake on payroll or a payment is a big deal.
• Driven and self-directed. You see what needs doing and do it without waiting to be asked.
• Organized. You can keep five things moving at once and nothing falls through the cracks.
• Trustworthy. You handle money, payroll, and confidential information with discretion.
• Flexible. No two days look the same, and you like it that way.

Expected hours: 40.0 per week

Work Location: In person