Backend & platform engineerUtrecht, NL

I build systems from idea to production, then hand them over.

Ten years, seven products of my own, most of them built solo and launched together with others. Below: what each one was for, how it was built, and what it taught me.

Now freelance at The Optimiser Company, Rotterdam, building a deal-capture system for energy trading. Open to new work.

Johan van der Boog
Products

Seven products, built end to end.

Newest first, numbered in the order I started them. Each page: the problem, what I built, the outcome, the architecture, and a timeline.

Career

Where I've worked.

  • 2026 – nowFreelance Software Engineer · The Optimiser Company, RotterdamGreenfield deal-capture system for energy trading: one deal lifecycle from bid to settlement across day-ahead, intraday and balancing markets.
  • 2022 – 2026Lead Data Engineer · Aimwel, DPG MediaData platform for performance marketing: 1M+ events a day, tracking API under 50 ms, warehouse costs down 65 percent, team of six.
  • 2020 – 2021Data Analytics Consultant · RockfeatherPower BI and SQL for clients; cloud data infrastructure design; a Tagetik and Anaplan integration.
  • 2018 – 2020Freelance Data Engineer · LUMC Nephrology, LeidenDatabase and ETL from scratch for transplant research covering 5,000+ procedures; extended twice, handed over.
  • 2017 – 2018Backend & IoT Developer · Peeeks, EnecoCloud infrastructure for storing renewable energy in household boilers: IoT, Telegram bots, data streams on AWS. Video (Dutch)

BSc Mechanical Engineering, TU Delft, with a custom minor in programming and computational intelligence.

Platform

Running it was part of the work.

Rekindo, Fixmora and Kazengo ran on a self-managed Kubernetes cluster at Hetzner for under €100 a month: one person, three live products, GitOps from a single repository, Postgres on plain VMs, secrets and monitoring handled properly. Deliberate trade-offs for the scale, and the operations experience that shaped how I build.

How it was put together →

Self-managed Kubernetes on Hetzner with GitOps

The Hetzner platform. Full size and details →

Skills

What I work with.

Languages & frameworks

Python TypeScript SQL Django FastAPI HTMX Next.js React Native

Cloud & infrastructure

AWS Kubernetes OpenTofu / Terraform Docker Argo CD GitHub Actions Cloudflare Proxmox

Data & AI

PostgreSQL Snowflake dbt Redis LLM integration Claude Code
Contact

Let's talk.

Open to a new role as a senior backend or platform engineer, and to bounded 0→1 projects with a clear start and an explicit handover.