C#/.NET: modernise what runs, build what is new properly
From .NET Framework to current .NET – while the system stays live, without a big bang.
Many .NET systems have carried the business for years and are still hard to change. We modernise them step by step and build new services so they are not the same problem in five years.
Why .NET projects often get stuck
A .NET system rarely becomes a problem because of the language. It becomes a problem because it is pinned to a version that is no longer being developed, because nobody wants to touch the dependencies, and because every release is manual work.
Migration in steps: we move .NET Framework to current .NET – component by component, with a running system after each step. That is exactly how we modernised the TIPPTHEK backend without interrupting operations.
Linux and containers instead of a special case: current .NET runs cross-platform. That removes the tie to Windows Server and its licence costs – hosting on Linux containers is usually markedly cheaper.
Tests before rebuilding: where there are no tests, we pin the current behaviour down first. Without that net, every modernisation is a gamble.
New work too, not only old: for new services we use ASP.NET Core and Entity Framework Core – and we say plainly when Laravel would be the more pragmatic route for your case.
Your .NET agency for migration and new builds
We take on both existing systems and new builds: migration, further development, interfaces and operations – with a clear view of what is actually worth doing.
Migration & upgrades
New services with ASP.NET Core
Interfaces & integration
Database & Entity Framework
Tests & CI/CD
Team extension & reviews
Technologies around .NET
C# and .NET for application logic, plus relational databases and cloud infrastructure. We choose per project, not by house style.
How we approach a .NET modernisation
Four steps that turn a stuck system back into a changeable one:
Survey it, do not guess
We read the code, measure the runtime and talk to the people who operate the system. The result is a list of risks, effort estimates and a recommendation on what you are better off not touching.
Pin the behaviour down
Before anything moves, we capture today's behaviour in tests. That is the difference between a migration and a bet.
Move in increments
Component by component onto current .NET, each with a running system and the option to stop. No cut-over date on which everything has to go right at once.
Simplify operations
Containers, automated deployment and monitoring – so the next version jump is routine rather than a project.
Do you run a .NET system nobody likes touching – or are you planning a new service?
In a free first call we work out what is worth doing, and in which order.
Success stories
with measurable results
GUTEFRAGE.NET / HIGHFIVVE
Largest German-language question-and-answer portal
Anyone looking for an app development agency will be delighted with Johnny Bytes. We held a workshop with gutefrage.net on the topic of apps and app SDKs and had a very in-depth and detailed exchange. The knowledge and experience that Johnny Bytes brings to the table is remarkable.
Nepomuk Seiler
JUST HEALTH GMBH
Therapy management platform for leading German cancer centres
Johnny Bytes was a complete game-changer for our digital health app. Their expertise is outstanding; they got up to speed in record time and drove our development forward with decisive technical insights. We absolutely recommend them for any complex app project.
Maximilian Roederstein
EMPOWER GMBH
World-leading provider of Microsoft Office applications
In the development of our software suite, we faced complex challenges. Johnny Bytes provided more than just strategic advice; they actively supported our development process and were decisive in its successful execution.
Stephan Kuhnert
APOTHEKE LUX 99
Leading pharmacy for medical cannabis
We wanted more than just an off-the-shelf e-prescription app; we needed a solution perfectly tailored to our pharmacy's specific workflows. Johnny Bytes' expertise in digital health was clear as they understood and executed our vision in perfect detail. The result is our very own app, which is a tremendous asset for both our customers and our team. For anyone seeking a truly custom solution, you've come to the right place.
Tobias Loder
READFY
Pioneer and leader in ad-supported e-book readers
With Readfy, up to half a million users regularly read over 130,000 ebooks for free. Johnny Bytes took over the apps for iOS and Android from our previous nearshore partner and not only brought them and the backend up to date in a very short time, but also ensured that in-app sales increased by 500%.
Philipp Ortmaier
PAGOPACE
Leading provider of NFC payment rings.
We were already able to offer our customers good hardware with our payment ring. However, Johnny Bytes helped us to build the perfect complementary software to take our product to the next level. We were kept up to date at every stage of the app development and were able to make requests immediately. With the new app, we can also sell our rings in retail stores, as customers can link their rings directly to their payment card on their cell phone.
Steffen Kirilmaz
FIRST AVENUE
#1 media house in South Tyrol
Johnny Bytes has taken over the development and support of our guest information system TIPPTHEK and migrated it to a modern and sustainable architecture in a very short time. This allows us to install TIPPTHEK in thousands of South Tyrolean accommodations and provide up to 35,000 tourists a day with personalized information about their accommodation and the surrounding area.
Michael Hölzl
STAZZLE
Innovative solutions for temporary staffing and recruitment
An agile team for whom customer satisfaction is just as important as quality, the Johnny Bytes team understands communication and requirements, asks the right questions, has a sense of humor and adheres perfectly to schedules. A strong partner that we recommend without reservation. Thank you for your support!
Tasso Mitsarakis
KOOPERATIONEN MIT HOCHSCHULEN
Innovative projects with research institutions
Together with Johnny Bytes, FH Aachen regularly conducts practice-oriented research projects as part of the Digital Lab. Most recently, prototypes for Alexa skills and AI-supported tourism solutions were created in this context. These projects are always an enrichment for our students, the university and the company.
Prof. Dr. Mathias Eggert
No time for second tries?
Discuss your idea in a non-binding and free consulting meeting.
Your personal contacts
Would you rather talk to us directly and in person? Then do not hesitate to get in touch with us.
