Selected work.

Denns BioMarkt runs 411 organic supermarkets across Germany, Austria and Luxembourg with a loyalty base of around 360,000 customers who had been carrying a plastic card.

We completed and launched the mobile platform that replaced it — the digital customer card, the offers behind it, and the middleware backend that had to hold from the first morning across four national markets at once.

There is no soft launch at this size. The app is live in every store on the same day, or it is not live.

• 411 — stores live across four markets
• 250,000 — app downloads in the first four weeks
• 30% — of them customers who had never been in the loyalty programme

Source: (BioHandel, AppBrain)

iOS · Android · Loyalty Middleware backend · Devops

A1 is one of Serbia's three national mobile operators. My A1 is self-care application where A1 users can maintain their subscription needs - check balance, pay bills, top-up credit and much more, in seconds..

Appex rebuilt it. Not an iteration on the old application, but a complete redesign delivered as a new project — and then carried past the hardest part, which is not the launch but everything the following months do to it.

The new app now runs on over two million active devices.

• 2,000,000+ — active devices on the new app
• 1 — application, rebuilt end to end

iOS · Android · Middleware backend · Frontend · Devops

A leading manufacturing company arrived with the question most manufacturers are quietly sitting on: where, if anywhere, does AI actually pay for itself here.

We ran an extended Validation Sprint across the whole operation rather than a single department — mapping the business end to end, finding where the real bottlenecks were, and defining five concrete AI use cases with the architecture and the implementation cost attached to each one.

They finished with a roadmap they could fund, and a clear view of which of the five to start with.

• 5 — AI use cases defined, architected and costed
• 1 — full operation assessed, not one department
• 4 — deliverables: specification, target architecture, roadmap, line-item budget

Amsterdam Dance Event is the largest electronic music conference and festival in the world — a record 600,000 visitors in 2025, spread across hundreds of venues in one city over five days.

The app is how one visitor turns that scale into a single navigable night — a personalised feed across thousands of events and artists, discovery that adapts to what you actually go to, and matchmaking for the industry that comes for the conference.

Built to absorb the traffic of an entire city moving at once, for five days, once a year.

• 600,000 — visitors in 2025, a record edition
• 5 — days, hundreds of venues, one city

Delivered in partnership with Bravoure, providing strategy and design, while technology provided by Appex.