React Agency
React is the standard for complex interfaces on the web. We use it to build applications that stay clear and fast even as the feature set grows.
Sound familiar?
- Your application keeps growing more complex and the interface can no longer keep up.
- You want to build on a technology standard that developers will still know years from now.
- Your web app and mobile app should share logic instead of being maintained twice.
Then a conversation is the fastest route to an assessment.
What we do - What we build for you with React
Web applications
Demanding single-page applications that feel as responsive as native software.
Dashboards and analytics
Data visualization, filters and real-time updates – fast even with large data sets.
Next.js websites
Fast, SEO-friendly sites with server components – just like this website here.
Design systems
Component libraries reused consistently across several products.
The four points where the cost is decided
**The boundary to the backend.** The most expensive mistake is business logic in the frontend: discount rules, permissions, price calculations. It then exists twice — once in the browser, once on the server — and over time the two drift apart. The split that holds up: the backend owns the data and the rules and is the only place that decides; the frontend renders and collects input. There is a simple test for it. What happens if someone sends the request straight to the API instead of going through the interface? If anything gets through, the rule was in the wrong place.
**The rendering strategy.** A purely client-rendered app hands search engines an empty document at first; content that is meant to rank effectively does not exist for the crawler. Next.js solves that with server-side rendering or static pre-rendering — what ships is finished HTML including title, meta data and structured data. The rule of thumb: anything that should be findable through search gets pre-rendered, and only what sits behind a login may run purely client-side. This website is the example: React 19 and Next.js 16, statically pre-rendered, with 2.5 seconds as the target for the largest visible element – the threshold at which Google rates Largest Contentful Paint as good. You can measure it yourself with PageSpeed Insights.
**Accessibility.** Under the European Accessibility Act it is mandatory for many services, and React makes it especially easy to lose, because you build the controls yourself. A div with a click handler is not a button: you cannot reach it with the keyboard, it has no role for a screen reader and no focus state. Four checks cover the most common failures — operate the whole page with the tab key, verify the focus is visible, measure contrast, and walk through your main form with a screen reader.
**The dependencies.** What a frontend costs in year three is decided by how many of them there are. Every package is a bet that somebody keeps maintaining it; a project with hundreds of indirect dependencies has work to do with every security advisory. Fewer, deliberately chosen packages, TypeScript for reliable interfaces and regular small updates are cheaper than the big leap after three years of standing still.
The counter-check belongs here too: for a company website with a handful of subpages, React is the wrong call — a CMS is faster to build, cheaper to run and maintainable without a developer. React pays off where people work rather than just read: dashboards, configurators, portals behind a login.
- Business logic stays in the backend, not the browser
- Pre-rendered, so the content can rank at all
- Keyboard, focus, contrast and screen reader checked
- Few dependencies, updated regularly
React components make up the interface, Next.js renders them server-side and connects the Laravel API.
Honestly
When we advise against it
Not every enquiry belongs with us. These are the ones we turn down in the intro call – here they are upfront, so you can skip the call.
A company website with a handful of subpages
A CMS is faster to build, cheaper to run and maintainable without a developer.
Better fit: Web DevelopmentContent that is mostly read
Pre-rendered HTML is enough. React solves a problem you do not have there.
Nobody to maintain the frontend later
Every frontend needs updates. Without someone for that, the simpler technology is the better one.
What the price depends on
We bill custom projects transparently by the hour. After a free intro call you get an honest estimate from us here in Bavaria – so you know where you stand before anything starts.
Verifiable
Instead of references: what you can check yourself
For this service we have no client reference we could show with numbers we can back up – and inventing one is off the table. What we can offer instead is work of ours that is public and that you can check without us being involved.
This website
Built with React 19 and Next.js 16, statically pre-rendered. The source, the sitemap, the structured data and the Core Web Vitals are all public – run the homepage through PageSpeed Insights and you see the same numbers we do.
Our Shopware plugins
Published in the official Shopware Store, which means they went through Shopware’s code review. The description, changelog and ratings live there, not here.
View in the Shopware StoreOur iOS app
WebDAV Browser is on the App Store – published under our developer account and through Apple’s review.
View on the App Store
Who builds this?
You work directly with Marcel
At Viovenia your project is not passed between rotating teams – it is built directly by Marcel, senior software engineer. You talk to the person who writes your code, from the first call to running in production. No project-manager loop, no ticket ping-pong.
How we work - Five steps to your project
Transparent and free of stress – that is how working with us goes. More about our process.
- 01
Intro call
Half an hour where you describe the project and get concrete questions back. It ends with a first read on feasibility and rough size – including when that read is “not worth it”.
- 02
Concept & quote
In writing, with scope, the technology involved, the assumptions behind it and what is explicitly not included. Split into “needed at launch” and “can come later”, so the scope stays negotiable.
- 03
Development in stages
After each stage there is something usable on a test environment, not just a status report. Change requests go in where they are cheapest: before the next stage starts.
- 04
Launch
Before going live: a run through the core workflows, a backup concept, monitoring switched on. Afterwards you get access, source code and documentation handed over in full, not on request.
- 05
Operation
Updates, monitoring and further development – as fixed care or on call. No minimum term: what keeps you should be the work, not the contract.
Frequently asked - Questions about React
- What is Next.js?
- Next.js is a framework built on React that adds server-side rendering, routing and performance optimizations. It is particularly useful when your application needs to rank well on Google.
- Is React overkill for a simple website?
- For a plain one-pager, often yes – we have leaner solutions for that. For anything with interaction, login areas or dynamic content, React plays to its strengths. We will honestly tell you what fits your project.
- Is React bad for SEO?
- Not when it is server-rendered. A pure client-side app hands search engines an empty page at first, and that costs visibility. With Next.js, finished HTML arrives — including title, meta data and structured data. For pages that need to rank, that is not an extra, it is the baseline.
- What about accessibility?
- It is mandatory for many services under the European Accessibility Act, and it is easy to lose in React because you build controls yourself. We use accessible component primitives, care about keyboard operation, visible focus states and contrast, and test with a screen reader — rather than bolting accessibility on afterwards.
- How do you keep the frontend maintainable?
- With a few deliberate decisions: a small number of dependencies instead of a package per problem, reusable components with clear responsibilities, TypeScript for reliable interfaces, and regular updates in small steps. The most expensive frontend is the one nobody has updated in years.
- Do you combine React with Laravel?
- Gladly. React on the frontend and Laravel as the API backend is one of our favorite combinations – a fast interface on a solid foundation. The division of labor is fixed: Laravel owns the data, the permissions and the business rules, React renders and collects input. That way the system never carries two versions of the truth.
Tell us about your project
Free intro call, no strings attached – we get back to you personally and quickly.