https://semmy.io/posts Full-stack engineer from the Netherlands specializing in secure digital solutions, modern web development, and crafting intuitive applications that prioritize simplicity and ease of use. en Sun, 21 Jun 2026 00:00:00 GMT https://semmy.io/posts/chasing-the-lighthouse-score https://semmy.io/posts/chasing-the-lighthouse-score I dragged this portfolio to a perfect 100, and the report still yelled at me. The wins were boring and real; the flags that stuck around were a trap dressed up as a metric. Sun, 21 Jun 2026 00:00:00 GMT https://semmy.io/posts/watching-real-users-test-the-dashboard https://semmy.io/posts/watching-real-users-test-the-dashboard I put the dashboard in front of three people who will actually use it: a planner, an operational employee and a team lead. Finding information was a solved problem. Finishing an action was not. Wed, 10 Jun 2026 00:00:00 GMT https://semmy.io/posts/dashboards-people-use https://semmy.io/posts/dashboards-people-use What I learned researching enterprise dashboards before building one: KPIs first, the right chart for the job, instant filters, and never a blank white screen. Sat, 02 May 2026 00:00:00 GMT https://semmy.io/posts/anatomy-security-assessment https://semmy.io/posts/anatomy-security-assessment How a real-world assessment actually unfolds: OSINT, network mapping, physical security and a phishing test, and why the findings are almost never exotic. Fri, 10 Apr 2026 00:00:00 GMT https://semmy.io/posts/unglamorous-security-wins https://semmy.io/posts/unglamorous-security-wins Architecture, least privilege and client-side hashing did more for a system I built than any clever trick, and one default password undid a chunk of it. Wed, 18 Mar 2026 00:00:00 GMT https://semmy.io/posts/macros-wont-die https://semmy.io/posts/macros-wont-die A deep dive from my red-teaming research into why VBA macros are still a live attack vector, and how attackers slip past modern defenses. Thu, 12 Feb 2026 00:00:00 GMT https://semmy.io/posts/security-first-web-development https://semmy.io/posts/security-first-web-development Why I treat security as a design constraint, not an afterthought, and a few habits that make secure apps the default. Thu, 15 Jan 2026 00:00:00 GMT https://semmy.io/posts/building-cytric https://semmy.io/posts/building-cytric What I learned building a secure, scalable bot-hosting platform solo, from branding and frontend to infrastructure and payments. Thu, 20 Nov 2025 00:00:00 GMT