Web development
Websites and web applications in Next.js and TypeScript. Carefully built and easy to maintain.
OutcomeA fast, findable site you can update yourself.
Software studio · Rotterdam
We build websites, apps and automations that last for years.
Rainvalley is a small, independent studio. We work with a select group of clients, and build and maintain our own products alongside.
Services
For clients — work starts with a conversation.
App development
Mobile applications that connect to existing systems and grow alongside the business.
OutcomeAn app that talks to the systems you already use.
Technical advice
Thinking along on architecture, tooling and choices that hold up for years.
OutcomeClear decisions, written down so your team can build on them.
Automation & scraping
Replacing repetitive manual work with reliable scripts, integrations and clean data flows.
OutcomeLess manual work, and data that arrives on time and in the right format.
How we work
From first conversation to ongoing care.
01
Introduction
A no-obligation conversation about what you want to achieve, what already exists and the budget.
02
Proposal
A concrete proposal with approach, schedule and price — fixed or hourly, clear up front.
03
Build
We build in short iterations and show working versions along the way, so you can steer.
04
Delivery & care
Handover with documentation. After that, we can take care of hosting, maintenance and further development.
Products
Most recent products, built and maintained by Rainvalley.
wielaardmarine.nl
W
Wielaard Marine
LivePolishing, maintenance and rental of boats for watersports enthusiasts.
Visit wielaardmarine.nlkoffiemeister.nl
K
relocnl.com
R
+ 24 more in operation
What we build with
- Next.js
- TypeScript
- React
- React Native
- Tailwind
- Node
- Python
- Sanity
- Stripe
- Vercel
- Odoo
- Selenium
- Playwright
- AI agents
About
Rainvalley is a small, independent studio based in Rotterdam.
We prefer to work on software that lasts: calmly built, well documented, without detours. Keeping the studio small is a deliberate choice; it leaves room for work that's done right.
Rainvalley VOF was founded in August 2026 by Kyran and Eunchong. You always talk directly to the people who build it.
Contact
Have a project in mind, or a question about one of our products? Send an email with a few lines about what you're looking for.
We reply within one working day.
Rotterdam, the Netherlands