Freelance Developer
I build web applications, business tools, websites, and custom software.
What I do
From idea to production — I cover the full spectrum of custom software development.
Full-stack web apps built for real workflows — fast, reliable, and tailored to your exact needs.
Custom internal tools, ERP modules, dashboards, and automation systems that save your team time.
Clean, responsive, and performant websites and landing pages that represent your brand professionally.
My Work
A selection of things I've built — real tools, real use-cases.
B2B SaaS platform for architecture firms to inventory recoverable materials from demolition or renovation sites, enabling reuse with CO₂ tracking and AI-powered strategic reports.
Upload an invoice, receipt, or letter and let AI extract its fields into an editable form — live demo embedded right here in this portfolio.
A stock management system built for SMBs. Tracks inventory in real time, provides reporting dashboards, and integrates with existing infrastructure via REST.
A collection of small games built as part of teaching Python programming — Tic-Tac-Toe, Snake, and more, each reinforcing core language concepts.
Toolbox
The technologies I use to build reliable, modern software.
About
I'm Harold Delacroix, a Brussels-based developer with a background in industrial engineering and automation. After several years delivering and validating monitoring systems on client sites, I moved into software development and now focus on building backend services, internal tools, and web applications for teams and businesses.
I've worked on Java backends, geographic and banking applications, HR tools, and public-sector projects, collaborating closely with DevOps, support, and non-technical stakeholders. My stack spans Java / Spring Boot, Python, and Node.js on the server side, through to React, Next.js, and modern front-end tooling — usually with PostgreSQL or SQL databases underneath.
I enjoy understanding real-world constraints, translating them into clear requirements, and turning those into robust features that are easy to maintain. If you need someone who can talk to users, reason about systems, and ship code, I'd love to hear about your project.
Get in touch
Have a project in mind? Let's talk. I typically reply within 24 hours.
Fast response. I typically reply within 24 hours. For urgent work, mention it in your message.