HARM MANDERS

Full-Stack
Developer
& AI Engineer

Background in AI, full-stack by trade. I build ChatAmsterdam, an LLM tool for the City of Amsterdam, and co-founded Shieldmaiden, a D&D SaaS I've kept alive for 7 years. 12 years of experience turning "someone should build this" into shipped software.

Harm Manders
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The toolbox

// things I reach for without thinking twice
Languages
JavaScriptTypeScriptPythonC#
Frontend
ReactVueHTML/CSS
Backend
Node.js.NETPostgreSQL
AI & ML
PyTorchComputer VisionClaude / LLM Engineering
Tooling
DockerGitCI/CD

My story so far

// drag sideways, I won't judge
2013 — 2018
Education

AI Bachelor

Artificial Intelligence

Learned the fundamentals of machine learning and caught the software bug for good — never looked back.

2014 — 2016
Work

Itsavirus

Front-end Web Developer

A software and interaction design company where I learned that pixels matter as much as logic.

2016 — 2017
Work

BIT Students

Web / Software Engineer

Built web solutions for everyone from scrappy startups to big corporations.

2018 — 2022
Work

Confocal.nl

Embedded Software Engineer

Pushed confocal microscopy forward, one embedded system at a time.

2019 — 2021
Education

Data Science Master

Deep Learning

Built a deep learning model that improved cell segmentation — my first real taste of AI research.

2019 — now
Work

Harmless Key

Co-founder

Making the game of D&D easier for both DM and player, one feature at a time.

2022 — now
Work

City of Amsterdam

Full-Stack Developer

Building software that impacts the citizens of one of Europe's most beautiful cities.

Things I've made

// mostly for D&D nerds, one for everyone else
Shieldmaiden screenshot

Shieldmaiden

↗ visit

A D&D combat tracker built to keep encounters fast and DMs sane.

Yggsil screenshot

Yggsil

in the lab

A smart knowledge graph for D&D worldbuilding. Not yet released.

Harmless Hitster screenshot

Harmless Hitster

in the lab

A Hitster-like card generator and player, for music guessing games.

Spellbook screenshot

Claude Skills Library

↗ visit

A GitHub Pages site collecting reusable Claude skills.

Let's build
something weird.

Always up for a good project, a hard problem, or a debate about the best D&D subclass.