Top 1317 administrative assistant Jobs in walnut, ca

Finance Accounting Administration Coordinator
Brea Networks, LLC —Brea, CA
- $55,000 - $65,000 a year
- Full-time
- Background check
- Microsoft Excel
- CPA
- Health insurance
- Dental insurance
Quick Apply
Admin Assistant & Operations Coordinator
American Precast Concrete Inc. —Pomona, CA
- $33 - $38 an hour
- Full-time
- Spanish
- Google Workspace
- English
- Health insurance
- Dental insurance
Quick Apply
10d
Office Administrator
Digitalsystem Americas Inc —Diamond Bar, CA
- $25 - $30 an hour
- Full-time
- Computer literacy
- Office
- Organizational skills
- Paid time off
Quick Apply
Construction Administrative Assistant
NATIONAL RENOVATION INC —Anaheim, CA
- $27 - $30 an hour
- 8 hour shift
- Google Workspace
- Customer service
- 5 years
- Health insurance
- Dental insurance
Quick Apply
Office Assistant/Bilingual English and Mandarin
TC INTERNATIONAL INC —Whittier, CA
- $20 - $25 an hour
- Full-time
- Bilingual
- Microsoft Word
- Google Workspace
- Health insurance
- Dental insurance
Quick Apply
Accounting Assistant
Law Offices of Bin Li & Associates —Diamond Bar, CA
- $22.10 - $25.00 an hour
- Email
- Background check
- Finance
- Analysis skills
- Health insurance
- 401(k)
Quick Apply
Office Assistant
Jcosme International Inc. —City of Industry, CA
- From $20 an hour
- Full-time
- English
- Office
- Microsoft Office
- Health insurance
- 401(k)
Quick Apply
Administrative Assistant, General
Sysco —Walnut, CA
- $24 an hour
- Microsoft Outlook
- Writing skills
- English
Front Office Receptionist
Puente Hills Dental Center —Diamond Bar, CA
- $22 - $27 an hour
- Part-time
- English
- Administrative experience
- Organizational skills
- Health insurance
- Dental insurance
Quick Apply
Office Coordinator
Western University of Health Sciences —Pomona, CA
- $30.00 - $34.54 an hour
- Full-time
- Background check
- Mid-level
- Office
- Paid time off
- Retirement plan
Administrative Clerical
Walmart —Chino, CA
- $25.30 - $29.80 an hour
- Full-time
- High school
- Entry level
- Paid jury duty
- Disability insurance
District Representative/Executive Assistant - Office of Senator Rubio (West Covina, CA)
California State Senate, Office of Senator Rubio —West Covina, CA
- $5,384 - $10,244 a month
- Weekends as needed
- Bilingual
- Writing skills
- Mid-level
- 401(k)
Executive Assistant
Western University of Health Sciences —Pomona, CA
- $70,304 a year
- Weekends as needed
- Background check
- Bachelor of Science
- Research
- Paid time off
- Retirement plan
Administrative Specialist IV (Restricted Funds)
Mt. San Antonio College —Walnut, CA
- $16 an hour
- Online Application
- Word processing
- Writing skills
- English
Receptionist
Covina Kia —Covina, CA
- $16.90 - $18.00 an hour
- Full-time
- Background check
- Dealership
- In-person
- Health insurance
- Dental insurance
Quick Apply
9d
Administrative Program Coordinator
City of Hope —Monrovia, CA
- $33.80 - $52.29 an hour
- Full-time
- Mid-level
- Office
- 3 years
Receptionist / Front Office Coordinator
4k Aluminum California —Brea, CA
- $24 - $26 an hour
- Full-time
- Mid-level
- Office
- Microsoft Office
Quick Apply
10d
Temp Administrative Assistant III
Western University of Health Sciences —Pomona, CA
- $27.85 an hour
- Weekends as needed
- Background check
- Mid-level
- Office
- Paid time off
- Retirement plan
7d
Administrative Assistant II
Western University of Health Sciences —Pomona, CA
- $26.12 an hour
- Full-time
- Microsoft Word
- Background check
- Writing skills
- Paid time off
- Retirement plan
Front Office Desk Coordinator
Black Bird Fire Protection, Inc. —Brea, CA
- $21 - $25 an hour
- Full-time
- Microsoft PowerPoint
- Microsoft Word
- Spanish
- Health insurance
- Dental insurance
Quick Apply
2d

I want to receive the latest job alert for administrative assistant in walnut, ca

By signing in to your account, you agree to SimplyHired's Terms of Service and consent to our Cookie and Privacy Policy.

Explore jobs in more locations

administrative assistant jobs near walnut, ca

Administrative Assistant jobs in Walnut, CA

Accounting Assistant jobs in Diamond Bar, CA

Front Desk Receptionist jobs in Diamond Bar, CA

Administrative Assistant jobs in Pomona, CA

Receptionist jobs in Covina, CA

District Executive jobs in West Covina, CA

Executive Assistant jobs in Pomona, CA

Office Assistant jobs in Whittier, CA

Office Administrator jobs in Diamond Bar, CA

Medical Assistant jobs in Elkin, Nc

Remote Administrative jobs in Charlotte, Nc

Administrative Assistant jobs in Oviedo, Fl

Administrative Assistant jobs in Georgetown, Tx

Administrative Assistant jobs in Chattanooga, Tn

Administrative Assistant jobs in Columbus, Oh

Administrative Assistant jobs in Orange, Ca

Medical Assistant Part Time jobs in Madison, Wi

Accounting jobs in Williamsburg, Va

Accounting Assistant jobs in Mckinney, Tx

Accounting Assistant jobs in Sacramento, Ca

Finance Accounting Administration Coordinator

Brea Networks, LLC
Brea, CA

Quick Apply

Job Details

Full-time
$55,000 - $65,000 a year

Benefits

Health insurance
Dental insurance
Paid time off
Vision insurance
401(k) matching

Qualifications

Teamwork
Internal controls
Microsoft Excel
Spreadsheets
Administrative experience
Bachelor's degree
GAAP
QuickBooks Online
QuickBooks
Recruiting
Accounting and finance experience
Excel data analysis

Full Job Description

ABOUT BREA NETWORKS

Brea Networks, LLC is a professional Managed IT Services and Cybersecurity firm headquartered in Brea, California, serving clients nationwide. We operate as a Managed Service Provider (MSP), Managed Security Service Provider (MSSP), and CMMC Compliance Service Provider, specializing in NIST 800-171, DFARS, ITAR, and CMMC frameworks to help regulated organizations maintain secure and compliant operations.

Founded in 2010, Brea Networks has grown into a trusted partner for government contractors, financial institutions, and businesses across the United States. Our culture is defined by professionalism, thorough documentation, consistent communication, collaborative problem-solving, and operational discipline.

We are building scalable internal systems and leadership capabilities to support long-term growth, including strengthening our finance and administrative function.

POSITION SUMMARY

The Office Manager is a key operational leader responsible for overseeing financial administration, billing operations, compliance coordination, and internal business processes. This role requires strong accounting expertise, operational discipline, and the ability to work closely with executive leadership.

In a recurring revenue MSP/MSSP environment, precision in billing, revenue reconciliation, and contract alignment is critical. The Office Manager ensures that financial systems are accurate, auditable, and scalable.

This position is structured to evolve into a Financial Officer role as the company grows. The selected candidate must demonstrate the capability to manage current responsibilities while building structured financial systems for future scale.

CORE RESPONSIBILITIES

1. Financial Management & Accounting

Oversee all Accounts Payable (AP) and Accounts Receivable (AR) functions
Maintain accurate general ledger records
Assist with payroll processing and commission tracking
Update and maintain the company’s Daily Financial Dashboard
Support monthly close process and prepare financial summaries for leadership
Ensure financial documentation is organized, complete, and audit-ready
Coordinate with external accountants, tax advisors, and auditors
Maintain strong internal controls to safeguard company assets

2. Billing & Revenue Operations

In a Professional Services and Managed Services environment, billing accuracy directly impacts profitability.

Oversee monthly recurring managed services billing
Ensure proper contract setup within the Professional Services Automation (PSA) system
Reconcile service activity, technician billable time, and agreements within the PSA
Monitor revenue alignment between:
Managed Service Agreements (MSAs)
Statements of Work (SOWs)
Service Level Agreements (SLAs)
Identify discrepancies between time entries, contracts, and invoices
Reduce revenue leakage through proactive reconciliation
Monitor AR aging and assist in collections follow-up

3. Vendor & Contract Administration

Manage vendor contracts, software licensing, and subscription renewals
Track renewal timelines for:
Client agreements (MSAs, SLAs, SOWs)
Vendor software and service contracts
Support pricing documentation and margin analysis of service offerings
Maintain centralized documentation for financial and vendor records

4. HR & Administrative Oversight

Coordinate recruiting logistics and onboarding documentation
Maintain employee records, certification tracking, and licensing documentation
Coordinate benefits administration and enrollment processes
Maintain confidentiality of sensitive financial and personnel information
Support internal communication and documentation systems

5. Compliance & Risk Management

Maintain documentation for insurance, audits, and regulatory requirements
Track internal policy acknowledgments and compliance training completion
Support cybersecurity compliance documentation in coordination with compliance and security teams
Maintain documentation standards aligned with CMMC and internal audit readiness

REQUIRED QUALIFICATIONS

Bachelor’s degree in Accounting or Finance
Minimum 2+ years of accounting or financial management experience
Strong understanding of GAAP principles
Experience with accounting software (e.g., QuickBooks or similar platforms)
Advanced proficiency in Microsoft Excel
High attention to detail and strong internal controls mindset

Outstanding recent CPA graduates are encouraged to apply.

PREFERRED QUALIFICATIONS

CPA certification completed
Experience in a recurring revenue or service-based business model
Experience in IT services, managed services (MSP), or cybersecurity industries
Experience working with Professional Services Automation (PSA) systems

LEADERSHIP & GROWTH PATH

This position is structured as a foundational leadership role within the organization. As the company scales, the Office Manager may evolve into a Financial Officer role, taking ownership of:

Financial strategy and forecasting
Cash flow management
Financial Planning & Analysis (FP&A)
KPI reporting and executive decision support
Oversight of expanded accounting staff

This role requires long-term interest in leadership development within a growing technology services organization.

KEY COMPETENCIES

Financial discipline and analytical rigor
Operational leadership mindset
Professional discretion and integrity
Process development and scalability focus
Strong communication skills with both technical and non-technical teams
Ability to operate independently while partnering closely with executive leadership

Job Type: Full-time

Pay: $55,000.00 - $65,000.00 per year

Benefits:

401(k) matching
Dental insurance
Health insurance
Paid time off
Vision insurance

Application Question(s):

Have you worked in a Managed Service Provider (MSP), IT services, or recurring revenue business model?
Have you used a Professional Services Automation (PSA) system (e.g., ConnectWise, AutoTask) to reconcile billing and service agreements?
Briefly describe how you would reconcile technician time entries to recurring client billing in a service-based company.
What was the average Accounts Receivable aging (in days) in your previous role?
How many business days did your company take to complete monthly close?
Do you currently hold a CPA license?

Experience:

QuickBooks: 8 years (Required)

Work Location: In person

Quick Apply

Refine Your Search

administrative assistant jobs in walnut, ca

Finance Accounting Administration Coordinator

Admin Assistant & Operations Coordinator

Office Administrator

Construction Administrative Assistant

Office Assistant/Bilingual English and Mandarin

Accounting Assistant

Office Assistant

Administrative Assistant, General

Front Office Receptionist

Office Coordinator

Administrative Clerical

District Representative/Executive Assistant - Office of Senator Rubio (West Covina, CA)

Executive Assistant

Administrative Specialist IV (Restricted Funds)

Receptionist

Administrative Program Coordinator

Receptionist / Front Office Coordinator

Temp Administrative Assistant III

Administrative Assistant II

Front Office Desk Coordinator

I want to receive the latest job alert for administrative assistant in walnut, ca

Related Searches

Explore jobs in more locations

Job Seeker Tools

Employer Tools

Browse

Stay Connected