Six systems, strongest first. Every one lists the decisions I made and what they cost.
.NET 9 · PostgreSQL 16 · Docker Compose · Supabase Auth · Hangfire
A containerised REST API where cross-user access is structurally impossible, slow work runs in the background, and the AI endpoint is tested for being right, not only well-formed.
ASP.NET Core MVC · EF Core · PostgreSQL · triggers & stored functions
Seven modules over one relational core, with the rules that matter — above all, no car booked twice for the same dates — enforced by the database itself rather than trusted to the UI.
ASP.NET Core 8 Web API · PostgreSQL · EF Core · JWT · team of eight
A campus platform — map, maintenance reporting with duplicate detection, events and transport — built by eight people to a fixed demo date. I manage the project and work in the backend team.
Spring Boot · Redis · MySQL · Hadoop HDFS · Ollama
Personnel data served through a Redis cache that flushes to MySQL, employee photos in Hadoop HDFS, and a chat page backed by a language model running on the same machine.
ASP.NET Core MVC + Web API · EF Core · PostgreSQL
One domain served two ways — Razor views for staff and a REST endpoint for other systems — without duplicating the data layer.
Spring Boot · MongoDB · R on GraalVM
A Spring Boot service that reads one MongoDB record per second and has R — running inside the same JVM on GraalVM — draw a live chart of the last 100 values.
Looking for the research? The machine-learning work is on the Research page.