Rainer Sternfeld is the Managing Partner at NordicNinja VC, a Helsinki-based venture fund with Japanese roots that he. See sector focus and contact routes.
Rainer Sternfeld is the Managing Partner at NordicNinja VC, a Helsinki-based venture fund with Japanese roots that he joined in November 2019 after nearly two decades as a technology executive and entrepreneur. Before his VC role, he co-founded and served as CEO of Planet OS, a climate-forward data company acquired in 2017, and has co-founded a total of 10 companies or organizations. NordicNinja VC backs ambitious founders in Europe tackling global challenges, with a focus on deep tech and sustainable transformation. While specific check sizes and lead/follow behavior are not publicly detailed in available sources, the firm is described as “an engineer’s fund” targeting mission-driven startups. Notable portfolio companies include Varjo, where Sternfeld serves as a Board Member, and Planet OS, his own former company that was acquired by Intertrust. Sternfeld has publicly discussed the choice between venture capital and bootstrapping, emphasizing how to determine if fundraising is appropriate for a startup’s stage and goals.
Every field above is read from the StartupFundraising investor directory — disclosed location, recorded investments and stated focus — and re-checked as filings arrive. Founders pair it with investors in Helsinki when building a target list.
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