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Got an app idea? I'll build it with you.
Web and mobile apps for startups and small businesses. Fast, reliable and ready to grow with your company.
What clients come to me with.
From web and mobile apps to stores and websites, I build products your users actually want to use.
- 01SaaS · dashboards
Web apps
Next.js · React · TypeScript
Dashboards, internal tools and SaaS apps tailored to your process, not to a ready-made template. Fast, and built to grow with your company.
- Dashboards & admin panels
- User accounts & roles
- Third-party integrations
- Content management (CMS)
- 02iOS · Android
Mobile apps
React Native · Expo
One app for iOS and Android from a single codebase, so it's cheaper and faster than building two. Smooth, with access to the phone's features.
- iOS & Android from one codebase
- Push notifications
- Offline mode
- Camera, GPS, biometrics
- 03Store · payments
Online stores
Next.js · Stripe
A store that doesn't just look good but actually sells. Fast loading, simple checkout, secure online payments.
- Secure online payments
- Frictionless cart & checkout
- Shipping & inventory integrations
- Optimized to convert
- 04Sites · SEO
Websites & landing pages
Next.js
A company website or a campaign landing page, designed to get visitors to reach out or buy. Light, fast and visible on Google.
- Lightning-fast loading
- SEO from the ground up
- Forms & lead capture
- Ready for campaigns & A/B tests
Got an idea but not sure what fits?
Get in touchFour steps, from idea to finished product.
From the first conversation to launch and what comes after. At every stage you know where things stand, and you talk to me directly.
01 / 04 · WK 01
Talk & plan
I start with a conversation about what you want to achieve, for whom and why. That turns into a concrete plan: scope, cost and timeline, before I write a single line of code.
- Project plan
- Scope & quote
- Timeline
02 / 04 · WK 01–02
Design
Before anything goes into code, I design the look and flow of the app. A clickable prototype shows how it will work, and it's easy to adjust.
- Visual design
- Clickable prototype
- Consistent design system
03 / 04 · WK 02–05
Build
I build the app and keep sending you progress along the way, so you know where the project stands and can react before anything goes off track. You're never left guessing.
- Regular progress updates
- Staging environment
- Documented code
04 / 04 · WK 05–06
Launch & growth
I deploy the product to production and watch over it for the first month: fixes, monitoring, finishing touches. After that it's your call: for an added fee I stay and look after it as long as you need, or I hand it over to you in full with complete documentation.
- Production deployment
- One month of post-launch care
- Ongoing care or full handover
Selected work.
All of them are live, have real users and keep growing.
Next.js
React
TypeScript
Supabase
Tailwind01Influencer marketing
Nanoinflu
An influencer marketing platform with a community of over 3,000 users, including 600 registered companies. Brands like Mohito, Pasibus, Próchnik and Mercedes have run campaigns on it.
Today I develop it as CTO of Nanoinflu.
Next.jsReactTypeScriptTailwind02Landing page
LuxJob
A recruitment landing page for the LuxJob agency. Clear structure, fast loading and search-engine optimization.
It's live and bringing in candidate applications for the company.
your-project.com
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03Your project
Your product could be here.
Your idea, my code. A web or mobile app, built properly from the ground up.
Who's behind Ermine Code.
About the approach to projects and the experience behind them.
hover to fan out · click for contact
Founder
Wiktor Gronostaj
CTO @ Nanoinflu · Founder of Ermine Code
By day, as CTO at Nanoinflu, I develop a platform used by thousands of people and hundreds of companies. Ermine Code is where I work directly with clients on smaller, polished products: simple, readable code that's easy to maintain and extend.
- Years pro
- 2
- In production
- 6
- Nanoinflu
- CTO
What else is worth knowing?
Short, concrete answers to the questions I get from clients most often.
It depends on the scope. A simple website or landing page is usually a few weeks; a larger web or mobile app takes a few months. After the first conversation and a defined scope, you get a concrete deadline, not a vague estimate.
Don't see your question here?
Just askLet's talk about your project.
A short conversation is usually enough to tell whether working together makes sense. No pressure and no commitment.