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Series A Climate tech companies in San Francisco

Companies decarbonising power, transport, agriculture, and industry. Filtered to Series A-stage companies headquartered in San Francisco.

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Built from a search like: “Top Series A Climate tech companies in San Francisco”

Ranked by current headcount across Series A Climate tech companies in San Francisco. Refreshed daily.

  1. 1
    DayOne Response Inc.· San Francisco, California, United States

    Clean Water for Disaster Preparedness and ReliefDayOne Response develops and supplies innovative solutions for disaster relief specifically for clean drinking water and is the exclusive North America distributor of the P&G Purifier of WaterTM packets. DayOne Response also distributes water and sanitation products globally to relief organizations, government agencies, and public and private entities. DayOne Response supports the Procter & Gamble Children’s Safe Drinking Water Program’s goal to deliver more than 2 billion liters of clean drinking water each year by 2020.DayOne Response offers two water purification products globally, including the DayOne WaterbagTM and the P&GTM Purifier of Water treatment packet.For more information, please visit www.DayOneResponse.com. Our team is deeply committed to our partners, customers and those who use our products. We are based in San Francisco, CA but operate globally.

    • Series A
    • 3 employees
    • Founded 2010

Find engineers at Series A Climate tech companies in San Francisco

Searching for “engineers at top Series A Climate tech companies in San Francisco” surfaces this slice of the market. The list above ranks Climate tech companies headquartered in San Francisco whose latest disclosed round is Series A, by current headcount, drawn from public LinkedIn and Crunchbase records. With 1 matching companies in Refolk’s index, this is a tight read on where the Climate tech talent in San Francisco is heating up.

Three filters at once narrows the field hard. The companies that survive all three - Series A, Climate tech, in San Francisco - are usually the most targeted recruiting pool a hiring manager can ask for. Senior engineers, founding designers, and product leads here are about to become Climate tech’s next operators and angel investors.

Refolk converts this list into a live search. Ask for “senior engineers at Series A Climate tech companies in San Francisco hiring” or “founders of Series A Climate tech companies in San Francisco who left in the last year” and Refolk returns a ranked shortlist with the evidence behind each match.

How this list is built

Refolk pulled Climate tech companies headquartered in San Francisco whose latest disclosed funding round is Series A from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 3 employees. The list refreshes once a day.

Last refreshed: Wed, 05 Aug 2026 16:57:22 GMT

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How is this ranking built?

The list draws on the public company graph - headcount and growth signals, funding history, and recency. The criteria chips at the top show exactly which filters produced it, and the methodology section explains the ranking.

How fresh is the data?

The underlying index updates continuously and this page re-renders at least daily. Last refreshed: Wed, 05 Aug 2026 16:57:22 GMT.

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Yes. Ask in plain English - for example "engineering leaders at these companies who joined in the last year" - and I return the specific people, with context on each.

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