I safely take over and gradually modernize your old business system built in FoxPro, Classic ASP, Delphi or Access, moving it to .NET. No downtime, with your data, business logic and established workflow intact.
public Task<List<Volno>> VolnaMista(DateOnly den) =>
db.Terminy
.Where(t => t.Datum == den)
.Select(t => new Volno(t.Id,
t.Kapacita - t.Rezervace.Count))
.ToListAsync();Plenty of companies still run on a system someone once wrote in FoxPro, Delphi or Classic ASP. It served them well for years, but today it is kept alive mostly by luck.
Microsoft has not patched it for a decade. It only runs thanks to Windows backward compatibility, and nobody can promise it will survive the next update.
DBF files on a shared drive, passwords in config files, no record of who changed what. Data protection law still applies to the personal data inside.
The original author has retired or moved on, and new FoxPro or Delphi developers are hard to find. Every change gets more expensive and riskier.
Online booking, mobile apps, e-shops, links to accounting or partners. The old system stays an isolated island.
The goal is not just new code, but a system that lasts another twenty years and that developers will still want to work on.
Already on .NET 8 or 9? Both reach end of support on 10 November 2026. Moving to .NET 10 LTS is usually a smaller step, but it is not worth postponing.
AI tools read tens of thousands of lines of old code in minutes. But I review every change and test it against the original system.
No AI will build your system from a single prompt without deep knowledge of your system and your processes. I will :)
I go through the code, the database and, above all, how you actually use the system. AI pulls out the business rules that were never written down, and I confirm them with you.
You get a clear document that is useful even if you order nothing more: what gets migrated, simplified or dropped, and what it will cost.
I migrate and clean the data into SQL Server or PostgreSQL. Duplicates, broken links and missing values are fixed now, not in the new system.
Module by module. The old system keeps running while new parts replace it step by step. No big weekend switchover, no stopped production.
Automated tests compare the results of the old and new system on real data. Then training, documentation and long-term support, if you want it.
A company booking system started in Visual FoxPro and later gained a separate SQL database. I'm merging both into one modern application while the business keeps running.
Native apps connected directly to your business system. For people in the field, in the warehouse or at the front desk who need data right away, without retyping it.
My own app for iOS, iPadOS and Windows
Control Soundcraft Ui12, Ui16 and Ui24R digital mixers with a hardware MIDI controller, a feature the manufacturer doesn't offer. The app talks to the mixer in real time and is used by sound engineers and bands.
For live performance
MIDI and MP3 player, set lists, virtual MIDI instruments with SF2 sound banks and DMX lighting control that builds its own scenes. More at beseda.us
A directory of businesses and services in Veselí nad Moravou, Strážnice and the surrounding area in South Moravia. I built the online edition and keep it running. The portal has its own admin panel for adding and editing listings, including managing and placing ads.
I've been programming since business systems were written in Delphi, FoxPro and C++. That's why I understand old applications: many of them were built with the same tools I started with. Today I work mainly in C# and .NET, and AI tools are part of my everyday work.
I'm an independent developer based in the Czech Republic. You talk to me directly, not to a salesperson, and I'm personally responsible for the design, the code and the operation.
And the name? Sax is the saxophone, tron is the tech. The hat comes with it.
I'll reply within two working days. The first consultation and a rough estimate are free. We can talk in English, German or Czech.