Executive Assistant

About ZBiotics

At ZBiotics, we make genetically engineered probiotics that improve daily life. As a group of motivated, yet down-to-earth people, we are fueled by two things: a love for science and a commitment to being people-first. GMO products like ours – built to create benefits for people in their daily lives – are the future. As the first to market, we believe it’s our duty to set a high bar for product quality, safety, and transparency for others to follow.

In 2019, ZBiotics launched Pre-Alcohol™ – the world's first genetically engineered probiotic drink – designed to break down acetaldehyde, an unwanted alcohol byproduct. In 2024, we launched Sugar-to-Fiber™, a genetically engineered probiotic drink mix that creates fiber from the sugar you already eat, contributing to microbiome health.

With a full line of genetically engineered probiotics in development, our team is growing. We’re looking for people as excited as we are to build this new category of consumer products. ZBiotics is headquartered in San Francisco and backed by Y Combinator and other venture investors.

About the Role

ZBiotics is growing, and so are the demands on our executive team and the operations that keep our company running smoothly. As our Executive Assistant, you’ll be the person who makes everything else possible: keeping our executives focused on what matters most, making our headquarters run seamlessly, and bringing our team together through well-planned company events and offsites.

You’ll serve as core support to the Executive team across communications, scheduling and priorities. Across the company, you’ll own company-wide calendaring for our operating cadence, act as our on-site lead for headquarters administration, and take a lead role in planning company offsites. Your impact will be measured in efficiency and enablement: fewer dropped balls, clearer priorities, and more time for our leaders and team to do their best work.

This role requires regular in-person presence at our San Francisco headquarters and Lab space in Brisbane, CA.

Your Responsibilities

The following are essential functions of this role:

Executive Support

- Manage complex, shifting calendars for the Executive team, proactively resolving conflicts and protecting time for high-priority work.

- Provide email and communications support, including triaging inboxes, drafting correspondence, and ensuring time-sensitive items are surfaced and addressed.

- Help executives prioritize their time and commitments, flagging what needs attention and what can wait or can be delegated. In other words, protect executive time; periodically audit recurring meetings and flag ones that execs can decline or delegate.

- Prepare for and capture key meetings, including agendas, pre-reads, notes, and action items. For high-stakes meetings (e.g., board meetings, Exec summits), also coordinate attendance, travel, rooms, breakfast/coffee, etc.

- Track follow-ups and chase action items to completion, keeping projects and commitments moving forward. Hold executives accountable to their commitments with persistent, friendly follow-up. You’re comfortable being the driver.

- Provide project management support on executive-led initiatives, including timelines, coordination, and status tracking. Build and set up projects and tasks in company project management tools.

- Manage high-touch and sometimes-urgent product shipments to investors and VIPs.

- Work closely with the Chief of Staff to help Executive leadership function. The EA owns administrative logistics and execution; the Chief of Staff owns leadership processes and strategic coordination.

Company Administrative Support

- Help manage company documentation and records (including filing documents in cloud-based file systems).

- Handle thoughtful relationship logistics, such as coordinating partner/vendor gifts, thank you notes, etc.

- Assist Finance with tracking down receipts and expense memos.

- Help coordinate