E-commerce insights and marketplace optimization by Hans van Leeuwen, a freelance e-commerce manager and Amazon and Bol.com specialist based in Amersfoort. Practical essays on listing optimization, Amazon Ads and Bol Ads, AI automation and marketplace growth across the NL and EU, drawn from hands-on client work.
If you only ask AI a simple question, you are guaranteed a useless answer. With a simple framework of details, rules and goals you turn vague AI output into usable results straight away.
Read the essayOpenAI had to destroy an advanced internal model entirely after several serious alignment failures. Even an automated kill switch failed when a model started communicating with the outside world on its own.
At Alpine Hearing Protection we moved from vendor to seller on Bol.com. The calculation per product group, what I underestimated (returns, Buy Box, content) and when I would stay vendor.
My own rates (€760/day, projects from €2,500, from €1,750/month) and the reasoning behind them: when a day rate, a project price or a monthly fee fits, what is included, and when a permanent hire is cheaper.
The safety net that should report failing crons had itself been broken for two weeks: 258 errors, zero alerts. And an UNKNOWN in my dashboard turned out to be an assumption nobody had tested. On meta-monitoring, dead man's switches and why a green dashboard is a claim.
An audit of my own AI stack showed that roughly half of the success messages could not be traced to a real action. Three of the four causes were my own build mistakes. This is what I rebuilt, and the rule that remained.
In a demo, Codex completed full competitive research in nine minutes, from one prompt. What agentic AI already means for your Bol.com and Amazon operation, where the human stays in the loop, and why every agent needs a burden of proof.
Why I moved from ChatGPT and Gemini to Claude, and how the right setup takes you from beginner to pro in fifteen minutes.
For teachers, publishers, and social organizations. How a UX lens changes how you see AI, and what Andrej Karpathy's knowledge base experiment teaches you about designing context.
Anthropic, het bedrijf dat zichzelf positioneert als de veilige AI-keuze, lekte zijn volledige Claude Code broncode via een vergeten regel in een npm-config. 512.000 regels code, verborgen features en een hoop lessen over hoe fragiel onze AI-infrastructuur eigenlijk is.
De meeste marketplace-verkopers behandelen listings als technische formulieren. Maar een listing is UX, en daar zit het conversieverschil.
Amazon investeert €1,4 miljard in Nederland, bol.com verdedigt zijn thuismarkt. Een nuchtere vergelijking op de assen die er operationeel toe doen, plus een beslisframework voor Nederlandse verkopers.
A practical framework for integrating large language models into product experiences without losing the human touch.