Company
All company information in one place — legal form, registration, founding, size, activity and location.
Who we are
We are two developers from Berlin. TJAX Labs is our joint studio: we build software that we use ourselves every day — small, fast and without unnecessary data collection. Our focus is on native apps for Apple's platforms, developed in Swift and SwiftUI. Concept, design, development and support come from the two of us.
We work without investors and without contract work. What we publish, we develop and maintain ourselves.
Founding and history
| 2026 | Maximilian Jonathan Bock and Tjark Sten Dieter Ruppe begin working together on their own iOS apps. |
|---|---|
| 21 July 2026 | Business registration (Gewerbeanmeldung) in Berlin via the portal “Gewerbeanzeigen Online über den Einheitlichen Ansprechpartner Berlin”. |
| 2026 | Founding of Maximilian Jonathan Bock & Tjark Sten Dieter Ruppe GbR as the joint legal entity. Adoption of the trading name “TJAX Labs”. |
| ongoing | Development of Packsy. A release on the App Store is planned; see Apps. |
Legal form and registration
| Company name (legal entity) | Maximilian Jonathan Bock & Tjark Sten Dieter Ruppe GbR |
|---|---|
| Trading name | TJAX Labs |
| Legal form | Gesellschaft bürgerlichen Rechts (GbR), a partnership under German civil law (sections 705 ff. of the German Civil Code, BGB) |
| Partners | Maximilian Jonathan Bock, Tjark Sten Dieter Ruppe |
| Authority to represent | Maximilian Jonathan Bock and Tjark Sten Dieter Ruppe are each individually authorised to represent the company. |
| Business registration | 21 July 2026, certified 28 July 2026 |
| Competent authority | Bezirksamt Treptow-Köpenick von Berlin, Ordnungsamt (district trade office) |
| File reference | gew-27261-2026 |
| Commercial / company register | A Gesellschaft bürgerlichen Rechts is not entered in the commercial register (Handelsregister). There is currently no entry in the company register (Gesellschaftsregister). |
The complete mandatory information under section 5 DDG (Digitale-Dienste-Gesetz, the German Digital Services Act) is set out in the Legal Notice.
Company size
The company has two partners and no employees. Last updated: July 2026.
Activity and industry
Registered business activity as filed with the trade office: development, design, publication and distribution of software, mobile applications and digital products, and related services (original German wording: „Entwicklung, Gestaltung, Veröffentlichung und Vertrieb von Software, mobilen Applikationen und digitalen Produkten sowie damit verbundene Dienstleistungen“).
Our focus is on our own applications for Apple's platforms (iOS, iPadOS, watchOS), which we develop, publish and maintain ourselves.
| WZ 2008 (Germany) | 62.01.9 — Other software development |
|---|---|
| NACE Rev. 2 (EU) | 62.01 — Computer programming activities |
| SIC | 7372 — Prepackaged Software |
Location
Maximilian Jonathan Bock & Tjark Sten Dieter Ruppe GbRRichterstraße 1
12524 Berlin
Germany
This is the business address and at the same time the address for service of process of the company. There are no further locations or branch offices.
Reachable by telephone Monday to Friday from 10:00 to 17:00 on +49 172 9894463, by e-mail at kontakt@tjaxlabs.de.