Executive Assistant and Office Administrator

About Tempo

Based in San Diego, California, Tempo develops thermochemical energy storage (TCES) systems designed for energy-intensive industries. The platform enables industrial operators to shift energy use over time by sourcing power when it is most cost-effective and enables the electrification of high-temperature industrial heat at a cost advantage to using fossil fuels. By storing electricity thermochemically, the system delivers a continuous stream of combustion-free, high-temperature air at up to 1,200°C.

Tempo is backed by leading climate and energy investors, including Breakthrough Energy Ventures, Khosla Ventures, and Prelude Ventures. For more information, visit

We are seeking a resourceful and highly organized Executive Assistant and Office Administrator to join our rapidly growing startup. As we develop cutting‑edge products for our thermochemical energy storage systems in our engineering and research facilities, we need someone who can keep our leadership team and our day‑to‑day operations running smoothly. This is a vital, multi‑fasceted role. You will serve as the administrative engine for our leadership team while also owning the systems that keep our office running and serving as the face of the company at the front desk.

The ideal candidate is equally comfortable managing complex international travel, scheduling high‑priority meetings, and making a strong first impression on investors, board members, and candidates walking through the door.

• Provide direct administrative support to the leadership team, including managing calendars, proactively scheduling internal and external meetings, and resolving scheduling conflicts with sound judgment on priorities.
• Coordinate complex domestic and international travel arrangements, including flights, accommodations, ground transportation, and detailed itineraries.
• Support board and investor logistics, including meeting preparation, materials coordination, and visitor arrangements.
• Handle sensitive and confidential information with consistent discretion.
• Coordinate meeting logistics, including physical and virtual room booking and required technology.

• Serve as the primary point of contact for all visitors and deliveries, maintaining a professional, organized, and welcoming reception area while directing guests to the appropriate host.
• Own the ordering and coordination of catering for office lunches, team events, board meetings, and daily executive meal orders.
• Maintain mailroom duties, receiving and sending office related mail and packages that are G&A related. This does not pertain to production or manufacturing.

• Keep the office and breakroom fully stocked by proactively monitoring and ordering office supplies, snacks, coffee, and beverages while ensuring cost‑effective purchasing.
• Act as the main point of contact for our cleaning crew and other facility vendors to ensure the office and common spaces are maintained to a high standard.
• Oversee maintenance for all office equipment, including printers and copiers.
• Maintain storage room cleanliness and ensure general office supplies are always accessible to employees.
• Assist with company events and team building, taking ownership of the process from start to finish once kicked off by tracking budget, logistics, and other critical moving pieces.

• 3+ years of experience as an executive assistant or in a senior administrative role, preferably within a startup or technical environment.
• Demonstrated experience managing executive calendars and coordinating complex domestic and international travel.
• Proven ability to manage a busy front desk while staying focused on detailed administrative…