Daan Lemmens

01 Mission log

My work experience, newest first.

1. Sep 2022 – now · St-Katelijne-Waver

   Full Stack Developer Paybix

   Working on Epix, a multi-tenant payroll and HR data platform that connects to payroll providers across Europe and the UK.

   • Most of the integration work runs through me in both directions: I implement and maintain integrations with external APIs, as well as the code used by external parties consuming our API
   • For new features and existing issues, I work directly with external teams and customers to clarify behaviour, explain functionality, and investigate bugs, including customer calls when needed
   • Mostly C# and .NET day to day: ASP.NET Core and EF Core on SQL Server, with REST and GraphQL on top, and React with TypeScript on the front end
   • Azure infrastructure as code in Bicep, with build and release pipelines in Azure DevOps
   • Multi-tenant throughout, so a feature has to hold up across customers on different payroll providers and in different countries

2. Sep 2022 – Sep 2023 · Mechelen

   IT Consultant ElmosExpert

   Placed at Paybix through ElmosExpert's hire-to-hire concept: a year on the team, and if both sides were happy, a permanent contract. They were, so that's where the Paybix entry above begins.

3. Oct 2020 – Aug 2022 · Kontich

   Software Developer Contribute NV

   Oracle APEX development for several clients.

   • Standards and customer management apps for NBN
   • Project-management automation for Sabam
   • Registration and online payment flow for walking federations (Cronolive)
   • Manual and automated testing for a Petronas application

4. Oct 2019 – Apr 2020 · Leuven

   Intern, then Front End Developer Cumul.io

   • Built an Angular library that embeds Cumul.io dashboards in a few lines of code, and wrote the tutorial and functional analysis that shipped with it
   • Migrated large parts of the Cumul.io Academy from AngularJS to Angular

02 Side quests

Personal projects, built in the evenings. AI tools are part of how I work on them.

Shipped

SWN Builder

A web companion for the tabletop RPG Stars Without Number: characters, ships and mechs, factions, sector and galaxy generation, a GM toolkit and PDF sheet export. Includes 3D procedural planets, offline PWA mode and Google Drive backup.

React 19 · TypeScript · Vite · Three.js · Zustand · Cloudflare Pages

Galaxy Flythrough Black hole Planets Sector Ships GM tools Characters

Live app Login required: the app ships licensed Stars Without Number material, so the source and the app stay closed.
Ask me for a walkthrough.

In progress

Star Rogue

An FTL-style sector-crawl roguelike with faction wars and a spreading corruption. So far: seeded procedural star systems with custom shaders for planets, nebulae and black holes.

Godot 4 · GDScript · GLSL shaders

Closed source while it is in development, since it may end up a commercial release.

Tinkering

Home dashboard & media server

I run InkyPi, an open-source e-ink dashboard, on a Raspberry Pi next to my media server. My additions: a macro-pad and knob controller daemon that switches views (weather, calendar, night sky, Home Assistant), a themed calendar plugin and patches to existing plugins.

Python · InkyPi · Raspberry Pi · Jinja2

03 Skill tree

What I reach for. Grouped by where it sits in the stack, not ranked.

How I work: I design and build with AI assistance, then review and test everything that lands.

Languages: Dutch (native) · English (C2) · French (basic)

04 Academy & off-duty

05 Get in touch

Send me a message straight from here, or find me elsewhere.