My website is outdated
Let me build a fast, responsive site that converts.
Order website →what do you need?
I need a mobile app
Cross-platform Flutter apps, from idea to App Store.
Order app →
My backend can't keep up
Robust APIs & data pipelines that scale.
Order backend →
My data is scattered everywhere
MySQL, NoSQL & analysis that drives decisions.
Order data solutions →
My server is unreliable
Linux servers, SSL, email — all under one roof.
Order hosting →
I'm worried about security
Encryption, audits & ongoing maintenance.
Order security →
Manual processes waste my time
Let me automate your workflows.
Order automation →
My legacy system is holding me back
Let me modernize your stack.
Order modernization →
I need AI but don't know where to start
Responsible AI integration, designed for your needs.
Order AI integration →
AVAILABLE // FREELANCE \ ZZP
Senior Full-stack
& Flutter-developer.
Web · app · back-end · Linux-infra — A→Z, under one roof.
roleSenior full-stack & Flutter
stackPHP · Flutter/Dart · MySQL · REST · Linux
exp25+ years · 1-on-1 · no middlemen
regionSouth Holland · NL & BE
I’m Waldis Koodeen — for 25+ years I’ve built software that actually works. From the first line of code to the running server: web, apps, back-end and infrastructure, under one roof. No middlemen, no noise — you work 1-on-1 with the developer who actually builds and runs it.
More about me →
what i build
Web
Fast, responsive websites & web apps.
Apps · Flutter
Android & iOS apps in Flutter / Dart.
Back-end & API’s
Robust back-ends, REST APIs & integrations.
Data
MySQL, NoSQL & data analysis.
Infra & hosting
Linux servers, deployment, SSL & email.
Security
Encryption, hardening & ongoing maintenance.
availability
Available
freelance / zzp
1 Sep ’26
start date · indicative
32–40
hours / week
Hybrid
NL · BE · ±60 km
selected work
Voertuigenonline
Online vehicle platform — built, secured & hosted in-house across .com / .nl / .be.
View the case →
SAM Online
Cross-platform sports app, live on App Store & Google Play; Flutter + Firebase/PHP back-end.
Government & industry
Reliable back-end systems & large-scale data processing — from a ministry to Gist-Brocades.
mission & vision
// Mission
With expertise and a passion for ICT we build, improve and optimise systems, processes and standards that make organisations perform more efficiently — correcting flaws, reducing risk and giving people clear information and reliable solutions.
// Vision
To become the trusted technology partner for a select group of SME and government organisations in NL & BE — and, alongside hourly work, to grow my own reusable platforms, specialising in responsible AI integration and security/privacy-by-design.
what clients say
Waldis delivered our platform on time and beyond expectations. His 1-on-1 approach made the process smooth and transparent.
Professional, reliable, and technically excellent. We've worked together for multiple projects now.
The security audit and hardening work gave us peace of mind. Highly recommended for any organization.
Let’s talk
A project, an assignment or just a question? I usually reply within one business day.