Work
7 systems. Each entry describes what was built and how it runs.
- 012026
A finance-content platform, in production
Marketing site, newsletter and news feed, with a members area behind Stripe billing. Postgres under default-deny row-level security, passwordless auth, and a news-ingestion pipeline feeding the published feed. The security model is covered by a SQL test suite that runs against a throwaway database.
Next.js 16SupabaseStripeResendVercel
- 022026
Bookkeeping for a Dutch sole proprietorship
An append-only ledger where corrections are booked as reversing entries rather than updates, Dutch tax rules written as pure functions of a tax year with every rate carrying its source, and gapless invoice numbering enforced in Postgres instead of application code.
TypeScriptNext.jsSupabaseTurborepo
- 032026
An AI and automation training programme
Ten live sessions, at least forty-eight hours, taught remotely and recorded in full. The presentation, the workbooks, the templates, the prompts and the context files are all handed over in editable form, so the material can be adapted and reused afterwards without asking permission.
Prompt engineeringContext engineeringExcelAutomation
- 042025
A containerised trading platform
MetaTrader 5 running under Wine behind a Flask API, orchestrated by Django and Celery across sixteen containers. Twenty-one scheduled tasks over three queues, a real-time tick pipeline on Redis pub/sub, and a full observability stack of Prometheus, Grafana, Loki and Alertmanager, with a Kubernetes deployment path alongside Compose.
PythonDjangoCeleryDockerKubernetes
- 052025
A B2B outreach and CRM system
Built for the Dutch market and in Dutch. Company enrichment driven by language models, a scheduled sending pipeline, and a CRM to track what happened next.
PythonPostgreSQLLLM tooling
- 062025
A microwave interface, taken apart and rebuilt
An existing combi microwave has nine controls and a display that changes meaning as you turn the dial. I analysed why it is hard to use, designed a replacement panel, and built the redesign as working hardware across two microcontrollers.
ArduinoC++I²C
- 072023
A cocktail bar that builds the drink itself
A machine that pours a cocktail you order from your phone. Built with one other student during a robotics course. The pumps were designed in CAD and 3D printed, the motion runs on an Arduino, and the ordering screen is served by the microcontroller itself.
OpenSCADBlenderArduinoC++ESP8266