Services · purr.cz
App development & MVP
Custom web applications and product MVPs — full stack, from architecture design through development to deployment and long-term operations.
- React / TypeScript frontend
- APIs & backend (Node.js, Hono, Go)
- MVP in weeks, not months
- Scalable architecture
From idea to a product you can click through
We build web applications and digital products full stack — frontend, backend, infrastructure, and deployment from one team. Our founder co-founded and led engineering on motion.page, and is the lead platform engineer on a multi-supplier ticketing platform: a custom React SSR engine on Cloudflare Workers serving 45 locales, an edge router compiling 23,000+ redirects, a B2B partner dashboard and a multi-tenant white-label system. We know what a product that has to survive production traffic looks like.
What we typically build
- Product MVPs — the smallest meaningful version that lets you validate demand. Fast, but on an architecture that can carry further growth.
- Custom web applications — customer portals, order systems, configurators, SaaS products.
- Extensions and takeovers — adding features to an existing app, technical audits, refactoring, stabilization.
- Payments and checkout — Stripe from the first API key to a fully fledged payment gateway: SCA/3DS, webhooks, recurring payments and subscriptions, refunds, reconciliation.
How we build
We design for growth: typed code (TypeScript), tests where they earn their keep, and Cloudflare infrastructure with minimal running costs. The code is written so another team could take it over — no dependency on us.
When it makes sense
- You have a product idea and want to validate it with an MVP
- You need a customer portal, ordering system, or configurator
- An existing application needs rescue or extension
How we work together
- 01
Discovery workshop
Goals, users, constraints. From the big vision we carve the smallest version that validates demand.
- 02
Architecture & plan
Technical design, milestones, risks. You know what lands when.
- 03
Iterative build
A working demo you can click through every few weeks. Not slide decks about progress.
- 04
Beta & testing
Real users, real data, error monitoring. Tuning before production.
- 05
Operations & scale
Production deployment, monitoring, further development — with us or your team.
What you get
- Application running in production
- Source code in your repository
- CI/CD pipeline and deployments
- Technical documentation
- Monitoring and error tracking
- Handover with no vendor lock-in
FAQ
What is an MVP and why start with one?
An MVP (minimum viable product) is the first working version of a product with just the core value — no extra features. You validate the idea with real users before investing in full development. We built the MVP for Rendero.ai, among others.
What technologies do you use?
TypeScript and React on the frontend, Node.js with Hono or Go on the backend, PostgreSQL for data, Cloudflare Workers for infrastructure. We choose per project — the goal is an application another team could take over.
Can you take over an existing application?
Yes. We run a technical audit, fix the riskiest parts first, and agree on a plan for further development. You don't have to start from scratch.
How long does an MVP take?
Typically a few weeks to a couple of months depending on scope. The proposal includes a timeline with milestones and working demos along the way.