Armin Sanjari
Managing Director, mathematics and analytics
Founded the agency IT-WINGS in 2016 and still runs it. It serves well-known clients in the automotive, consumer goods, pharma and mechanical engineering industries.
Custom software development.Built with AI, checked by us.
Web apps, internal tools and automations, from architecture to operations. The AI writes fast. Whether the result is sound and secure is our call.
User interface
Web app for your team and your customers
Integrations
CRM, ERP, shop, email and AI assistants via API and MCP
Business logic
Hard-coded rules that calculate, compare and decide
AI components
Language models that read documents and draft text
Operation
Hosting, monitoring, backups and clear data flows
When is custom software worth it?
Custom software is worth it when a process defines your business and standard tools can only handle it through lots of workarounds. Typical signs are Excel lists between systems, duplicate data entry and knowledge that rests with one person.
AI has changed the math. Much of what used to be a large project can now be built in a fraction of the time. That makes software worthwhile even for processes where it never would have paid off before.
We don’t just talk about it. With Propspector and UTM Spot, we run our own software and know what comes after the first release.
Excel holds everything together
Between CRM, ERP and email sits a list only one person understands. If that person is out, the process stops.
The tool almost fits
Standard software covers 80 percent. The rest is done by hand and never shrinks.
AI remains an experiment
A few people on the team use chatbots. None of it reaches your processes. Nobody really knows where the data goes.
What our custom software work includes.
Web apps and platforms
Applications for your team or your customers, from the interface to the database.
SaaS products
When the software itself is your product. With accounts, roles and payments, the way we built it for our own products.
Internal tools
Small applications that replace an Excel list or a process run by email. Often this is the quickest win.
AI automation
Reading documents, sorting inquiries, transferring data. The AI handles the repeatable part. Critical steps stay with people.
Document review
We apply the approach behind Propspector to your documents, such as contracts, minutes or technical documents.
Integrations and MCP
We connect your systems via API and, if you wish, make them available to AI assistants like Claude and ChatGPT via MCP.
Architecture and security
Clean structure, clear data flows and processing in the EU where your data requires it.
Handover or operations
You get documented software and run it yourself. Or we run it for you.
For us, built fast doesn’t mean unchecked.
AI writes code fast. The risk is that nobody reads it anymore. That’s why every change we make goes through a fixed review cycle.
- 1The AI writes
Code, tests and documentation take a fraction of the time they used to.
- 2We review
Someone accountable for them reviews the architecture, security and data flows.
- 3Tests guard it
Automated tests run on every change and catch regressions early.
- 4Operations teach
What comes up in daily use feeds into the next pass.
From idea to production in four steps.
- 1
Understand
We clarify what problem the software should solve and how we measure success.
- 2
Prototype
A first working version shows early on whether the idea holds up and what needs to change.
- 3
Development
The AI writes fast. We check architecture, security and every important step.
- 4
Operation
We hand it over with clean documentation or, if you wish, keep running it.
The AI does the grunt work. We make the decisions.
What the AI does
- Write code, tests and documentation
- Read and explain existing code
- Track down bugs and suggest fixes
- Read documents and data in your processes
What our team does
- Define architecture and data flows
- Check and approve every important step
- Decide what the AI can do and what the code decides
- Answer for security and operations
The people behind it.
More about us
David Otto
Managing Director, economics and growth
Has been scaling digital businesses since 2015, first at Festool, then for six years at Mercedes-Benz. There he led projects in digital products and global performance marketing.
The model reads. The code decides.
This is how Propspector is built. A language model pulls the facts from the documents. Hard-coded rules compare and classify them. This separation is what makes AI reliable in business processes. We use it in your project too.
How Propspector worksFrequently asked questions about custom software.
What does custom software cost?
That depends mainly on scope, integrations and data protection requirements. We often start with a small prototype because it makes the estimate for the rest much more accurate. After that, you get a specific quote.
What is custom software?
Custom software is built for the processes of one specific company, not for a broad market. It belongs to you and adapts to your business. Standard software works the other way around.
How quickly can a web application be developed?
A first working version is often up within days, because the AI takes on much of the writing. Getting it running securely with real data takes weeks to months, depending on scope.
Is AI-written code secure?
Not automatically. That’s why we check architecture and security ourselves, write automated tests and approve important steps only after a review.
Who owns the software?
You do. You get the complete, documented code. Whether you run it yourself or leave operations to us is up to you.
What is AI automation?
AI automation takes over recurring work that used to require reading and classifying, such as checking documents or sorting inquiries. Built well, it runs within fixed rules and passes critical cases to a person.
Can you build on existing software?
Yes. We dig into the code and tell you frankly whether it’s worth building on or whether part of it should be rebuilt.
Do you work with companies outside Stuttgart?
Yes. We are based in Stuttgart and work across Germany. We meet in person wherever it helps the project.
What should your software do?
Tell us what you have in mind. We will tell you honestly whether it’s worth it and how we would start. You’ll get a reply within 24 hours.
hello@kessel-und-code.de
Rotebühlplatz 11–15, 70178 Stuttgart