App agency for B2B projects
You are planning a mobile app and are wondering what the process looks like, what it costs and how to find the right partner? As a mobile app development company with more than 12 years of B2B experience, we guide you from the first workshop to go-live and beyond.
Request a non-binding consultation View the 7 phasesConcept, design, development, testing and maintenance, all coordinated by one team
References: flaschenpost SE, CLAAS, SAP, DHL, OBI, real business applications in production
Cross-platform, iOS and Android at enterprise level, matched to your requirements
Many people equate app development with programming. Programming is only one part of the whole. Anyone who commissions mobile app development is not buying a piece of code. You are buying a working digital product that convinces users and fulfills its business purpose.
App development covers all phases: requirements analysis, concept, UX/UI design, technical implementation, quality assurance, deployment, long-term maintenance and further development. Only when these phases work together cleanly does an app emerge that truly works in day-to-day business.
From our experience with well over 50 app projects, we repeatedly see the same pattern: companies underestimate the effort required for concept and design, start programming too early and pay for it later through expensive rework and delayed launches. An experienced app agency brings not only developers, but also project managers, designers and architects. That is the difference between an app that gets finished and an app that becomes good.
If you are looking specifically for information about technical implementation, start with our pages on cross-platform app development and .NET MAUI. For native apps, see our pages on iOS app development and Android app development.
The complete process
This process has proven itself over more than a decade and dozens of B2B projects. Every phase has a purpose. If you skip one, you usually pay twice for it in the next.
Before a single line of code is written, the requirements must be right. What should the app do? For whom? What is the core problem it solves? In our discovery workshops, we work with you to identify which features are truly necessary, which would be nice to have and which should wait until version 2. We help you define a realistic MVP that can quickly test what works in the market. Do many projects fail in phase 1? Yes. Not because the idea was bad, but because business goals and technical feasibility were never properly aligned.
Now the idea becomes a plan. Which platform makes sense: iOS, Android or cross-platform? Which features come in which order? What should the technical backend look like? This phase produces feature lists, user stories and the rough system architecture. What we always recommend to customers: take your time here. One hour saved in this phase can cost ten hours in development.
An app is only as good as the experience it gives its users. In the design phase, wireframes, clickable prototypes and finally the finished interface are created. We test early with real users so that navigation or interaction problems do not appear only at go-live. You can find more on our app design page.
This is where design and concept become a working application. Depending on the requirement, we use native development with Swift for iOS or Kotlin for Android, or cross-platform solutions with .NET MAUI. The architecture is built so the app can grow without becoming unstable. Interfaces to ERP, CRM or other backend systems are documented clearly and implemented for long-term maintainability. You can find more on the choice of technology on our pages on .NET MAUI and cross-platform app development.
We test on real devices, not just in the simulator. Functional tests, performance tests and security tests. A typical scenario we often see: teams postpone testing until the end and then enter go-live with a long bug backlog. For us, testing is not a separate sprint at the end. It is a continuous part of development. That makes the launch more stable and less stressful.
App store guidelines are not automatic. Apple and Google review apps before publication, and a rejection costs valuable time. We support the review process, prepare store listings and help with the rollout strategy. Which users get the update first? How is the launch communicated internally and externally? That is also part of a complete mobile app development service.
The real life of your app begins with go-live. Operating system updates, new devices, growing user feedback and new requirements from the business all need attention. Anyone who commissions an app without planning maintenance risks ending up with an app that no longer runs reliably 12 months later. We offer flexible maintenance models: maintenance contracts with defined service levels, monthly hourly packages and project-based further development as needed.
We hear this question often. And the answer does not always favor us: an agency is not the right choice for every project.
| Criterion | App agency | Freelancer |
|---|---|---|
| Costs | Higher, but predictable and contractually secured | Lower hourly rate, but often hidden coordination costs |
| Breadth of expertise | Design, development, testing and project management from one source | Usually development only, rarely including design or testing |
| Availability | Team can compensate for absences, no single point of failure | Dependent on one person and their capacity |
| Scalability | Team can be scaled up or down depending on project phase | Limited to the capacity of one person |
| Long-term maintenance | Contractually secured, clear SLAs possible | Dependent on the freelancer's long-term availability |
When is a freelancer worthwhile?
When you have a clearly defined, small project, the scope will not grow and the budget is below 15,000 euros. For a simple internal tool app or a clearly delimited feature extension, a good freelancer can be the more efficient solution.
When do you need an app agency?
When your project has B2B requirements. When interfaces to existing systems such as ERP or CRM are needed. When the project runs for several months and requires different disciplines. When you need a reliable partner for maintenance and further development after go-live. And when you want to find an app developer who is not tied up with another customer tomorrow.
Not actually after an app, but a business application, a backend or an interface? Then what you want is custom software development. That page explains how we build custom software for mid-sized industry.
Choosing the right app agency often decides whether a project succeeds or fails. This checklist will help you evaluate providers:
Has the agency implemented comparable projects in your industry? Ask for concrete results, not screenshots. Take a look at our references: projects for flaschenpost SE, CLAAS, DHL, SAP and OBI show what is possible in B2B contexts.
Does the technology used fit your requirements and what you want to maintain long term? An agency that masters only one stack is not always the most flexible choice.
How quickly and transparently does the agency respond to your first inquiry? In our experience, this is often the most reliable indicator of the later collaboration.
Is there a documented development process with clear milestones, reviews and defined deliverables? Gut feeling is not a substitute for project structure.
What happens after launch? Are there service level agreements? Is the team reachable if a critical production bug appears?
Who will actually work on your project? If you only meet the sales contact and never the developers, you should ask more questions. At Cayas, you meet your project team during the initial consultation.
Who owns the code after the project ends? That sounds obvious, but it is not always the case. Clarify this before signing the contract.
A reputable app development company will give concrete answers to all these questions. Anything else is a warning sign.
The short answer: it depends. But these benchmarks help with an initial estimate:
The most important cost drivers in mobile app development are the platform choice (native for iOS and Android costs more than cross-platform), the design ambition (complex animations and fully custom UI are time-consuming), backend complexity (every additional interface means development and testing effort) and the number of launch features.
What we always recommend to customers: start with a focused MVP and expand after initial user feedback instead of building everything at once and later discovering that half the features are barely used.
You can find a detailed breakdown of all cost factors on our app development costs page.
Technology is not an end in itself. We choose the stack that best fits your requirements and can be maintained long term.
One codebase, iOS and Android. Significantly lower development and maintenance effort with enterprise-grade performance. Our core expertise. More about cross-platform apps.
For maximum performance and deep access to Apple platforms. Ideal if your target audience uses iOS exclusively. More about iOS app development.
Optimal performance on Android devices and close access to the Android ecosystem. More about Android app development.
The technical side
Anyone who commissions app programming is buying the technical core of the project. This is where it is decided whether the app runs reliably day to day and can be extended for years. We apply these four points to every B2B app:
Before the first line of code is written, we plan the technical foundation:
This is the basis for an app on iPhone, iPad or Android that can grow for years without becoming unstable.
A professional implementation does not end in the frontend. We
This makes the app part of your digital process chain. You can find more on our page about API development.
Good usability is created not only in design but also in implementation:
Whether iPhone, iPad or Android device: we program so that the app feels smooth in everyday use.
Here we pay attention to:
This way you can keep developing the app with us over the long term or hand it over to your own team if needed.
A new development is not always necessary. In many cases it is enough to modernize an existing application, update technologies or move it from one platform to another, for example from iOS to Android or the other way round. On request, we deliver it for several operating systems at once with .NET MAUI.
If your app dates from the Xamarin era, the migration to .NET MAUI is the obvious path. Functionality and usability are preserved while reach and future viability grow. If another agency built the app and you want to change partners, we start with a code audit and assess what can be developed further at what effort and what is better rebuilt.
Discuss your existing app
"Cayas Software is an excellent team! I personally enjoyed the energy and professional support the entire team gave us during the project."
Your app agency from OWL
We are a specialized app development company from Minden in the OWL region of Germany. Not a large consulting firm with hundreds of anonymous customers, but a focused team that knows its specialization and consistently invests in it.
You can find concrete project results in our references.
Request a consultation
Let's talk about it.
Whether you want to launch a new product, modernize an existing application or build an internal process app. In a non-binding initial consultation, we clarify:
Free initial consultation, Non-binding, Response within 24 hours
FAQ
Costs depend heavily on scope. Simple apps start at around 25,000 euros, medium-complexity projects with backend integration range from 50,000 to 150,000 euros, and enterprise apps with ERP integration can be significantly higher. The main cost drivers are platform choice, design ambition and backend integration complexity.
You can find a detailed breakdown of all factors on our app development costs page.
Realistic timelines from our project experience: a simple app can be ready in 3 to 4 months. A medium-complexity app with multiple platforms and backend integration takes 5 to 7 months. A complex enterprise app with extensive integrations often takes 9 months or more. Concept, design, quality assurance and app store review are already included in these timelines.
For small, clearly delimited projects, a freelancer can be the more efficient and cheaper solution. For complex B2B projects with system integration, a longer duration and the need for long-term maintenance, an app agency is the safer choice. You are not buying an individual talent, but a team with processes, backup capacity and contractual responsibility for the overall result.
That depends on your target audience and budget. If your users are on both platforms, we recommend cross-platform development with .NET MAUI: one codebase, iOS and Android, significantly lower development and maintenance effort. For maximum performance and deep device access, we use native development.
The better the preparation, the more efficient the project. Helpful inputs for the initial consultation are: a clear description of the problem the app should solve, a rough idea of the target audience, a realistic budget and initial timeline, and a list of core features the app absolutely needs. We work out concept, design and technical architecture together with you.
Check references in your industry, ask about the concrete development process and clarify early who will actually work on your project. Finding an app developer does not mean choosing the cheapest option, but the partner with the right experience for your project. Ask for concrete project results and how the agency handles unexpected requirement changes.
The real life of your app begins with go-live. Operating system updates from Apple and Google, new device generations, growing user feedback and new business requirements require continuous maintenance. Cayas offers flexible maintenance models: maintenance contracts with defined service levels, monthly hourly packages and project-based further development as needed.
Yes. We regularly take over apps developed by other agencies or freelancers. The first step is always a code audit: we analyze architecture, code quality, interfaces and test coverage, then tell you what is feasible, at what effort, and what we would advise against. That lets you continue without unpleasant surprises.
Depending on the project goal and platform, different languages and frameworks are used:
Development uses Xcode, Android Studio and Visual Studio, complemented by CI/CD pipelines and device farms for testing. Whether native or cross-platform, we decide together with you based on budget, target group and scope.
We develop native apps for iPhone and iPad as well as for Android smartphones, tablets and wearables. Mac and Windows are also possible, either natively or through a cross-platform solution with .NET MAUI. Whether a single platform or both make sense, we clarify together with you in the initial conversation.
The focus is on apps that optimize internal processes and on apps that extend existing products and services digitally. Typical examples:
You can find concrete projects in our references.
Yes. Xamarin has had no support since May 2024, which is why the migration is a topic for many existing apps. We move projects to SDK-style projects and dependencies to a current .NET version and adapt platform-specific code. Functionality and usability are preserved.
More on our page about the Xamarin migration and in the blog article 7 steps to migrate from Xamarin.Forms to .NET MAUI.
Yes. Many clients come to us with a prototype, an existing code base or an internal idea. We either join the ongoing programming or rebuild your concept technically from scratch. If you provide concept and design yourself, you can also book the implementation as a single service through Expert-as-a-Service.