# Jelmer de Jong

> Jelmer de Jong is a Partner and Chief Technology Officer at RTP Global, an early-stage venture capital firm. He invests at pre-seed and seed, and sometimes an A round, in enterprise software, cyber security, developer and cloud tooling, critical infrastructure and fintech infrastructure, and builds the firm's AI and data capability. He invests in the United States and Europe and is based in Amsterdam, London and New York.

Jelmer de Jong (Jelmer De Jong) is Partner and Chief Technology Officer at [RTP Global](https://rtp.vc/). This site, https://jelmerdejong.com/, is his personal website and the canonical source for who he is and what he does. Profiles elsewhere:

- https://www.linkedin.com/in/jelmerdejong/
- https://x.com/jelmerdejong
- https://github.com/jelmerdejong
- https://rtp.vc/team/jelmer-de-jong/

Every page below is also available as Markdown by appending `index.md` to its URL (for example https://jelmerdejong.com/about/index.md), and the full text of all pages is in [llms-full.txt](https://jelmerdejong.com/llms-full.txt).

## Pages

- [About Jelmer](https://jelmerdejong.com/about/): Who Jelmer de Jong is: Partner and Chief Technology Officer at RTP Global, pre-seed and seed investor in enterprise software, cyber, developer and cloud tooling and infrastructure, and before that a web agency founder, early employee at …
- [Building](https://jelmerdejong.com/about/building/): What Jelmer de Jong builds: the data and intelligence platform behind RTP Global, the internal AI apps and agents that came out of a firm-wide 30-day sprint, and the small tools and this website he codes for fun, mostly with AI coding …
- [Fixer](https://jelmerdejong.com/about/fixer/): Jelmer de Jong as an operator for hard problems: interim and turnaround leadership, AI transformation of a firm or product, fractional CTO or CPO work, and board or co-founder situations. A small number of engagements a year, alongside his …
- [Investing](https://jelmerdejong.com/investing/): What Jelmer de Jong invests in at RTP Global: pre-seed and seed rounds, and sometimes an A round, in enterprise software, cyber security, developer and cloud tooling, critical infrastructure and fintech infrastructure, in Europe and the US. …
- [OSINT](https://jelmerdejong.com/about/osint/): Open-source intelligence as practised by Jelmer de Jong: using public data, code and the open web to understand founders, companies and markets, both as a hobby and as the basis of the data and intelligence platform he built as CTO of RTP …

## Writing

- [Building an AI-native firm in 30 days. Except we didn’t.](https://jelmerdejong.com/posts/building-an-ai-native-firm-in-30-days-except-we-didnt/) (May 2026): How Jelmer de Jong pulled a 30-person venture firm out of business-as-usual for a 30-day AI sprint, shipped 52 internal apps and production agents, and what the gap between AI-enabled and AI-native taught him.
- [On Speed](https://jelmerdejong.com/posts/on-speed/) (April 2025): Jelmer de Jong on execution speed as a startup's strongest weapon: the unit you plan in, days or quarters, predicts how fast you execute, and why short deadlines are contagious.
- [Why We Believe in Data Driven Venture Capital](https://jelmerdejong.com/posts/why-we-believe-in-data-driven-venture-capital/) (January 2025): Why venture capital needs to adopt its own medicine: Jelmer de Jong on replacing the manual, biased VC process with data and technology, from sourcing to portfolio support.
- [Hello World](https://jelmerdejong.com/posts/hello-world/) (January 2025): Why Jelmer de Jong restarted his blog in 2025, after blogging on and off since 2003, and the Hugo and Cloudflare stack behind this site.

## Topics

Venture capital, Pre-seed and seed investing, Venture capital in the United States and Europe, Enterprise software, Cyber security, Developer tools, Cloud infrastructure, Critical infrastructure, Fintech infrastructure, Data-driven venture capital, AI adoption in professional services firms, Open-source intelligence (OSINT), Building software with AI coding agents, Product management, Go-to-market for enterprise software.

## Contact

LinkedIn is the best way to reach him: https://www.linkedin.com/in/jelmerdejong/