I’m Gerwin, a software engineer. I build and ship software end-to-end, from backend to infrastructure. Below you’ll find what I’m working on and what I’m thinking about. Want to know more? Check the about page. Want to reach me? Scroll down.
Software Engineer
Gerwin Kuijntjes
Software engineer who builds and ships software end-to-end, from backend to infrastructure.
NL / EN
About
Featured projects
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SaaSSlicekit: A Full-Stack .NET + React SaaS Template You Own
A production-grade SaaS template that ships the boring 80% already built: an event-driven .NET 10 API (vertical slices, DDD, CQRS, messaging) paired with a typed React 19 SPA, plus an Astro marketing site. Passkeys, TOTP, OAuth, granular permissions, a finished admin panel, a hash-chained audit trail, full observability and CI included. Built because I kept rebuilding the same foundation on every project, and sold once under a commercial license so you own the code.
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PersonalGeldhoek: Privacy-First Calculators for Dutch Money Questions
A free, privacy-first suite of Dutch financial calculators in one place: net salary, maximum mortgage, allowances, savings, and box 3. Every calculation runs client-side, with privacy-friendly analytics that only shows statistics and never your inputs, built on a single source of truth for fiscal figures that is verified each year against official sources.
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SaaSStaticForm: Form Backend With Spam Filtering and Full Observability
A SaaS platform that turns any HTML form into a reliable submission pipeline, with 10+ spam checks, complete action logging, failure alerts, and a flat monthly fee that never charges per submission. Built originally to stop rebuilding the same form backend for every client project; now used by developers and agencies managing forms across multiple sites.
Recent posts
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AI Is a Car, Not a Bike: How to Actually Use It as a Developer
Why AI coding is a skill, not a threat, and how thinking of it as a car instead of a bike makes you far more effective
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How to Fix Procrastination for Good: A Scientific Approach
Discover how to overcome procrastination by managing activation energy and entering flow, based on principles from physics and chemistry
Get in Touch
Let's Connect
Do you have a question, useful feedback, or an idea we could work on together? I intentionally don't use social media, but feel free to contact me via one of the options below.