Administrative Coordinator/HR Generalist

As the Administrative Coordinator & HR Generalist at Gantri, you will play a critical role in ensuring the smooth day-to-day operations of our office while also supporting key HR functions. This hybrid role requires a blend of organizational efficiency, attention to detail, and people-first problem-solving to maintain a well-functioning, employee-friendly workplace. You’ll manage office logistics, support HR administration—including payroll and timesheet audits—and contribute to creating a positive, productive work environment.

This full-time, hybrid role is based in San Leandro and will report to our workplace manager. You’ll also collaborate with various teams across the company to address evolving office and HR needs as they arise.

• Maintain office inventory, including ordering supplies, snacks, and equipment to ensure a well-stocked and organized workplace.

• Plan and coordinate internal events, team-building activities, and office celebrations.

• Work with our facilities manager to oversee office vendors and service providers (cleaning services, maintenance, IT support, etc.).

• Manage incoming and outgoing mail and general office upkeep.

• Maintain and audit employee timesheets in our HRIS system to ensure accurate time tracking.

• Process bi-weekly payroll, ensuring timely and accurate submissions.

• Support onboarding, offboarding and position change tasks

• Help maintain HR records, compliance documents, and benefits administration.

• Assist with setting up and tracking review cycles, training and employee surveys

• Act as a point of contact for general HR and payroll inquiries, escalating issues as needed.

• Assist leadership with administrative tasks and special projects as they arise.

• Support internal communications related to office updates, policies, and HR initiatives.

• Continuously identify and implement improvements to office operations and workflows.

• Office Operations Expertise – Ability to efficiently manage workplace logistics, vendor relationships, and office organization.

• HRIS & Payroll Proficiency – Experience working with HRIS platforms for payroll processing and timesheet auditing. General knowledge of HR and payroll rules and regulations.

• Event Planning & Coordination – Strong organizational skills for coordinating team events, celebrations, and office gatherings.

• Problem-Solving Mindset – A proactive, adaptable approach to handling evolving office and HR needs.

• Attention to Detail – Accuracy in payroll processing, compliance tracking, and office management.

• 2+ years of experience in office management, HR administration, or a similar role.

• Experience working with HRIS and payroll systems (e.g., Rippling, Gusto, or similar platforms).

• Strong organizational, multitasking, and time management skills.

• Proficiency in Google Suite, Slack, and other office productivity tools.

• A proactive, self-starter mindset with the ability to anticipate and address workplace needs.