Bert Devriese

I'm Bert Devriese, a web and app developer with 20+ years of experience . No agency, no layers in between: you work directly with the maker.

I build web and mobile apps that fit how your business actually works and make your systems talk to each other. The best proof is the software I've built and run myself. One of those products, Coachbox, grew into a company where I'm now full-time CTO.

20+ years building software · 90,000+ newsletter subscribers · 3,000+ coaches on a platform I built · ~1M downloads of my open-source invoicing library

See what I've built

Software I've built and run

Coachbox

CTO ♦ 2016 - now

The #1 platform for endurance coaches. 3,000+ coaches and 25,000+ athletes in 15+ countries, endorsed by IRONMAN world champion Frederik Van Lierde.

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UBLBuddy

Maker ♦ live

Open Peppol invoices on your own computer, just like you open a PDF or Word file. No hassle.

Visit UBLBuddy

Num•Num

Founder ♦ 2016 - 2021 Sold

Simple e-invoicing for freelancers and small businesses, a Peppol alternative that replaces spreadsheet admin. Built and sold in 2021.

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Berts Goedkope Vliegtickets

Maker ♦ since 2016

Belgium and the Netherlands' #1 cheap-flight newsletter. Automated price scanning sends 90,000+ subscribers the best deals by email.

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Tools for developers

OpenSolo

Maker ♦ live

A native macOS workspace that runs your coding agents, dev servers and terminals side by side, grouped per project. Schedule agents and spawn support agents on demand.

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Screenshot Shelf

Maker ♦ live

A screenshot shelf for macOS. It watches your screenshot folder and drops every new shot into a floating shelf at the edge of your screen (your choice of position), one drag away, so you can pull it straight into your AI coding agents while you build.

Download

I created num-num/ubl-invoice , an open-source PHP library for UBL and Peppol invoices with 130+ stars and close to a million downloads, and still help maintain it.

In the early days of Aikido Security I built their aikido-cli and the Bitbucket integration.

Currently building, not for hire