Jelmer de Jong. Partner to tech founders.

I've spent over two decades building companies and products, using technology and data to gain an edge -- as a founder, marketer, product manager, tech & data lead, and now as VC. I am not bound by a formal job description: I do what needs to be done.


I work with founders and VCs to build and bring product ideas to life -- to help you win. I enjoy firefighting and special projects.


Based in Amsterdam, London, and New York. Investor @ RTP.


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On Speed

Execution speed is the most powerful tool a startup has against competitors, against the market, and against incumbents. Execution speed shows quickly. Not in delivery, but already in the earlier planning phase. Execution speed shows when asking “when” or creating plans: where large companies create yearly plans or roadmaps with quarterly deliverables, others plan not for “next month” but for “tomorrow” or “give me an hour.” The test is simple. If you plan, do you plan in years, quarters, months, weeks, days, or hours? The smaller the planning unit, the higher the execution speed. ...

April 16, 2025 Âˇ Jelmer de Jong

Why We Believe in Data Driven Venture Capital

Venture capital (VC) is traditionally a people-based, non-scalable business. Do you want to do more deals? Hire more people. Want to do deals in a new region? Open a new office. Want to provide better support to your founders? Hire an ops team. For an industry that invested billions of dollars in technology companies, the venture capital industry lacks proper technology adoption. It is one of the last industries to embark on the digital transformation journey. ...

January 7, 2025 Âˇ Jelmer de Jong

Hello World

2025 will be the year of the revival of the blog. …or at least it will be for mine. Not for a particular reason; I’ve been blogging on and off since 2003, back when Blogger was still a thing, Twitter did not exist, and personal blogs didn’t receive spam but 10+ comments on every post, and that with only 20 visits. I stopped and restarted on different platforms to play with the tech or because I felt I had something to share. And that something always felt cringe a year later, which resulted in clicking ‘destroy’ (and no guarantee that will not happen this time). ...

January 2, 2025 Âˇ Jelmer de Jong