Office administrative assistant Jobs in Concord, CA

On-Board Services is hiring an Administrative Assistant in Bay Point, Ca

For immediate consideration please send your resume to

Subject Line : Position Title and State you are located

About Us :

On-Board Services, Incorporated is an on-site contract service provider for a local manufacturing entity providing full time positions to our employees. We offer benefits as well as k.

Position Details :

Title :  Administrative Assistant

Position Type : Contract

Job Location : Bay Point, CA

Shift : st Shift

Benefits : K, Dental insurance, Life Insurance, Medical Insurance, Vision Insurance

Compensation : $ / HR

Administrative & Office Support

• Execute administrative support tasks with minimal supervision, following established policies and procedures.
• Serve as the primary point of contact for internal and external inquiries via phone, email, and in person; triage issues and determine urgency.
• Manage the Site Director’s calendar, appointments, correspondence, and paperwork to ensure accuracy and timeliness.
• Organize and support meetings—including preparing agendas, taking accurate minutes, and proactively tracking action items.
• Coordinate business travel arrangements and process travel expenses for site leadership and designated team members.
• Perform general clerical duties such as filing, document preparation, data entry, and recordkeeping.
• Provide front-office coverage including greeting visitors, coordinating check-in, and partnering with Security on access needs (including badge issuance).

Operational & Financial Support

• Research, compile, and prepare reports, presentations, charts, and other documentation as needed.
• Support departmental and project financial processes, including monitoring budget spend and preparing / approving requisitions and invoices.
• Assist in managing department purchasing requests, vendor coordination, and cost tracking.
• Coordinate site tours, audits, and leadership visits; ensure required materials and safety protocols are in place.

Event & Engagement Coordination

• Plan and support internal / external business-critical events (, town halls, kaizen / S events, customer tours, trainings).
• Coordinate itineraries, logistics, accommodations, registrations, catering, and onsite materials for events and visiting personnel.
• Support employee engagement initiatives, volunteer activities, recognition programs, and site communications.

Site Logistics Support

• Assist with receiving and shipping coordination to manage incoming and outgoing mail and packages.
• Maintain office supplies inventory; oversee service requests for office equipment and meeting spaces.
• Collaborate with Human Resources on onboarding (badges, workstation readiness, orientation schedules) and other people-related initiatives as needed.

Qualifications :

The Administrative Assistant provides high-level administrative and operational support to the Director of Operations and the manufacturing leadership team . This role ensures efficient day-to-day operations by managing communications, coordinating schedules, supporting departmental processes, and assisting with site-wide activities. The ideal candidate thrives in a fast-paced plant environment, demonstrates strong organizational skills, and maintains a high degree of professionalism, confidentiality, safety awareness, and initiative.

• Associate degree in a related field or equivalent professional experience.
• years of administrative support experience, preferably supporting Director / Executive-level leaders in a fast-paced environment.
• Strong proficiency with Microsoft Office (Outlook, Word, Excel, PowerPoint, SharePoint, Teams).
• Experience with badge creation / access management systems.
• Excellent written and verbal communication skills and strong interpersonal abilities.
• Ability to multitask effectively while maintaining attention to detail.
• Self-starter with exceptional organizational and time-management skills.
• Demonstrated discretion, confidentiality, and professionalism.
• Ability to stand for extended periods as needed.
• Ability to lift up to pounds occasionally (, event setup, packages).

Preferred Skills

• Experience in a manufacturing, operations, or industrial environment.
• Familiarity with procurement systems (, Ariba, SAP).
• Experience supporting cross-functional leadership teams.
• Working knowledge of Lean or continuous improvement tools (, S, kaizen).
• Experience with expense and travel platforms (, Concur).