## About the project

**Wakacje.pl Magazyn** is an inspirational and editorial platform, part of the **Wakacje.pl** ecosystem. It publishes travel guides, tips, and destination inspirations that support users in choosing and planning their trips.

## Technologies

The project was developed with a modern fullstack web stack:  
- **Next.js 14** – server-side rendering, static generation, and routing.  
- **React.js** – building interactive user interfaces.  
- **TypeScript** – type safety and maintainable development.  
- **Styled Components** – CSS-in-JS styling for modular UI.  
- **Apollo GraphQL** – data fetching and state management.  
- **Express** – backend server layer.  
- **Redis** – caching and performance optimization.  
- **Sentry** – monitoring, error tracking, and performance analysis.

## Status

The magazine is actively developed and available at: [wakacje.pl/magazyn](https://www.wakacje.pl/magazyn/). It serves as a knowledge base and source of inspiration for millions of Polish travelers planning their holidays.

Wakacje.pl Magazyn – a travel content and inspiration hub, part of the largest holiday portal in Poland.

wakacje.pl/magazyn

## About the project

The official website for **DeveloArt** — a software house and technology partner.  
It was designed and developed from scratch with a focus on speed, SEO, and modern web development practices.

## Technologies

The site was created using a modern Jamstack approach with the following stack:
- **Astro v5.5.4** — static site builder ensuring fast, SEO-friendly pages.  
- **TypeScript** — type safety and maintainable codebase.  
- **TailwindCSS** — utility-first styling for a clean, responsive UI.  
- **MDX** — content system enabling Markdown + React components.  
- **Vercel** — deployment and hosting with global CDN.  

## Status

The website is live at [develoart.com](https://develoart.com/) and serves as the digital showcase of DeveloArt’s services, portfolio, and expertise.

Website for DeveloArt — technology partner and software house.

develoart.com

## About the project

The **Pstryk Mobile App** extends the functionality of the Pstryk web platform to iOS and Android devices. It enables electricity consumers in Poland to benefit from dynamic energy pricing, monitor usage, and manage payments directly from their smartphones.

## Key Features

- **Dynamic electricity prices** – view upcoming hourly rates to optimize energy consumption.
- **Real-time monitoring** – track electricity usage and costs instantly through live data.
- **Bills & payments** – pay electricity bills conveniently in-app.
- **Notifications & alerts** – reminders for billing, consumption thresholds, or price changes.

## Technologies

The mobile app was built using modern cross-platform technologies:  
- **React Native & Expo** – cross-platform development for iOS and Android.  
- **TypeScript** – type safety and maintainable code.  
- **Tamagui** – design system and UI components.  
- **Zustand & TanStack React Query** – global state management and API caching.  
- **React Hook Form + Zod** – advanced form handling and validation.  
- **Sentry** – monitoring, crash reporting, performance optimization.  
- **Detox & Jest** – automated testing (unit + e2e).

## Status

The app is officially released and available on [App Store](https://apps.apple.com/pl/app/pstryk/id6480014032?l=pl) and [Google Play](https://play.google.com/store/apps/details?id=com.bankilo.pstryk&hl=pl), serving as a key component of Pstryk’s mission to make energy management more transparent and user-friendly.

Mobile application for Pstryk – Polish energy service offering dynamic electricity prices, usage tracking, and bill payments.

Pstryk Mobile App

## About the project

**Wakacje.pl** is the largest holiday portal in Poland, visited by millions of clients every month. The platform allows travelers to browse, compare, and book thousands of vacation offers from leading tour operators around the world.  
The project involved developing a modern web application to ensure fast search, intuitive navigation, and a seamless booking process for customers.

## Technologies

The project was developed using modern web technologies:  
- **Next.js**  
- **Node.js**  
- **TypeScript**  
- **Styled Components**  
- **MobX**  
- **React Hook Form**  
- **Express**  
- **Redis**  
- **Sentry**

## Status

The portal is actively used by millions of clients across Poland, helping them find and book their dream holidays in a fast and convenient way.

Wakacje.pl – the largest travel portal in Poland, visited by millions of clients every month and offering thousands of holiday deals worldwide.

wakacje.pl

## About the project

Pstryk.pl is a platform for electricity consumers in Poland. It offers dynamic pricing so users can pay less for electricity by using it during cheaper hours. Through a mobile app and web portal, customers can track their electricity use, monitor real-time and historical costs, view their carbon footprint, and pay bills with ease. All formalities of switching providers are handled fully online.

## Key Features

- **Dynamic electricity prices** – prices vary within the day; users see rates ahead of time to plan consumption. 
- **Usage tracking & transparency** – tools for seeing current consumption, cost breakdowns, and clean energy indicators.
- **Online bills & payments** – you can view and pay bills in the app or online.
- **Support for prosumers, EV users, households with heat pumps** – Pstryk offers options for those with increased energy needs and renewable sources.

## Technologies & Responsibilities

The project was built using a modern web stack:  
- **Next.js & TypeScript** – development of dynamic, SEO-friendly web app.  
- **React Hook Form** – advanced form handling with validation.  
- **Sentry** – monitoring, error tracking, and performance analysis.  
- **REST API & WebSocket integrations** – real-time electricity pricing and consumption data.  
- **Authentication & Payments** – secure login, online payments, integration with external providers.  
- **CI/CD pipelines & cloud deployment** – automated builds, tests, and deployments to ensure stability.  

I was responsible for:  
- Building core user flows (registration, billing, consumption tracking).  
- Implementing real-time data visualizations.  
- Optimizing performance and SEO.  
- Close collaboration with backend team to design efficient API contracts.  

## Status

The service is operational across Poland, with the mobile app available on iOS and Android. It is positioned as a pioneer of transparent and user-friendly dynamic electricity pricing in the Polish market.

Polish energy service offering dynamic electricity prices, letting consumers save, track usage.

Pstryk.pl

## Introduction

This website was meticulously crafted from the ground up using Next.js, along with various complementary technologies. Its inception dates back to June 2025.

Ongoing enhancements, encompassing both functionality and content, are in the pipeline. This website stands as a treasured repository of my acquired knowledge, also serving as a platform for me to disseminate insights.

If you have any questions, suggestions, input or anything else, don't hesitate to contact me🧑‍💻

Personal website was built originally from scratch using several powerful stacks.

kamilcode.com

## About the project

The website "antystresownia.pl" was designed and built to present the offer of psychologist Michał Karpeza. It was created using the Next.js 14 framework, TypeScript, and Styled Components

## Technologies

The project was developed using modern frontend technologies:
- **Next.js 14**
- **React.js**
- **TypeScript**
- **Styled Components**

## Status

The website has been launched and is available at: [antystresownia.pl](https://antystresownia.pl).

Website for psychologist Michał Karpeza, created with Next.js, TypeScript and Styled Components.

Kamil Zieliński

Projects

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