01
No hype
I only use AI where it truly adds value. Otherwise I simply build good software.
Heijnex · Software & AI
actually works.
I build custom software with AI at its core — practical tools that automate work, make sense of data and keep running long after the demo.
What I stand for
No hype, no black boxes. Just software that understands your data, automates the boring parts and keeps getting smarter — built to run in the real world.
02
No black boxes
You always know what happens and why. Clear explanations, your own code and no vendor lock-in.
03
Built to last
Tested, documented and maintainable. It keeps working, even when I'm not looking.
Luca Heijnen
Founder & software developer
Available for new projects
Arnhem, the Netherlands
About
Practical AI. Built to just work.
I'm a software developer and the person behind Heijnex, working primarily in Python, with C# as a close second. I build software that puts AI to work where it actually helps: automating workflows, connecting systems and turning data into decisions.
From smart homes to energy installations, my software runs in the real world — not just in a demo.
How it looks
You do your work.
The software does the rest.
An example: invoices from your inbox are read, checked and booked automatically. No more retyping.
- Reads PDFs, scans and emails
- Checks and flags uncertain cases
- Books straight into your own system
1# Process incoming invoices automatically2from pathlib import Path3from app.ai import extract_fields4from app.erp import book_invoice, request_review56for pdf in Path("inbox").glob("*.pdf"):7 invoice = extract_fields(pdf)8 if invoice.confidence >= 0.95:9 book_invoice(invoice)10 else:11 request_review(invoice) # human in the loopSkills
AI
AI & Machine Learning
Language models, predictions and smart automation — applied where they add real value, not for show.
Language
Python
My primary language, used for AI, automation logic, data processing and integrations with hardware and APIs.
Language
C# / .NET
Backend services, web applications and tooling where a strongly-typed, compiled stack fits best.
Integration
Automation & Integrations
Connecting APIs, devices and platforms into automated flows that are dependable day to day.
Stack
My toolbox
The tools and platforms I use every day to build, test and ship.
Services
What I can build for you.
AI-Powered Software
Custom applications with AI built in: assistants, document processing, predictions and smart automation.
Automation & Integrations
Connecting your tools, APIs and devices so work flows by itself — from business processes to smart homes and energy systems.
Custom Software
Python and C# development for backend systems, internal tools and everything in between.
Process
How I work.
- 01
Discovery call
A no-obligation conversation about your idea, your goals and where AI or automation can truly help.
- 02
Proposal
A clear plan with approach, timeline and a fixed price or transparent estimate. No surprises.
- 03
Build
I work in short iterations and regularly show working versions, so you can steer along the way.
- 04
Delivery
You test the result, I fix any issues, and we take it live together.
- 05
Ongoing support
After launch I can take care of maintenance, support and improvements, so it keeps working.
Available for new projects
Let's build something smart.
Have an idea where AI or automation could make a difference? I'd like to hear about it.
- E-mailinfo@heijnex.tech
- LinkedInLuca Heijnen
- LocationArnhem, the Netherlands