hi, i'm
kylian de groot
software builder
working on winstwaker
location the coast
load time—ms
local time—
what i do
building productsfrom first idea to live in production
software & apisdata systems that stay up when it gets busy
automationfinancial processes that keep themselves current
synthetic datatraining data for foundation models
remote-first, hands-on in the product. ship fast, little theatre.
winstwaker
Online bookkeeping for Dutch entrepreneurs. Steady review, filings on time, and software that takes the heavy work away.
no fussbooks that keep themselves current, from receipt to filing
people + softwareautomation with a named bookkeeper watching over it
sharper every daybuilt to get a little better all the time
research
- 2026 Absence of Errors Is Not Evidence of Completeness A fiscal product that books webshop revenue without a human watching the feed has to answer a question that looks too simple to write down: how do we … working paper
- 2025 When Summation and Rounding Fail to Commute The questions in this paper are elementary. They can be stated in one line each, and a reader who has divided integers will already suspect the answer… working paper
investing
contact
prive@kyliandegroot.com personal
info@winstwaker.nl business
If you have my number, feel free to call. Then we know each other well enough, or we have done business before. Practical that way. :)