Grzegorz
Rails programmer open to different technologies. Expert in unsolvable challenges. Passionate gamer, game creator and regular participant of Global Game Jam. Constantly developing skills related to image analysis and neural networks.
Skills
Backend &Frondend Development Application Architecture API Design Refactoring VisualizationGlobal JSON Invoicing Standard
An open-source project written in Go, standardizing global electronic invoicing with JSON. It simplifies document creation, ensures compliance with local regulations, and fosters seamless electronic business communication. With a JSON Schema, library, and global tax database, GOBL streamlines the invoicing process for developers. The project emphasizes a practical and standardized approach to electronic business document exchange.
Major contributions
- JSON to KSeF structure converter (Go)
- JSON to XRechnung structure converter (Go)
Amenitiz
hotel management application
A comprehensive property management platform designed for short-term rental property owners and managers. Streamlines operations with tools to manage reservations, channel distribution, and guest communications.
Major contributions
- Integration with Invopop
- Invoicing configuration for Mexico
- Backend development in Ruby on Rails
- Backend development in Go
- Frontend development in React (Storybook)
- Backend communication using protobuf
- Fixes &pipeline maintenance
Julinek AR
augmented reality circus game
A simple game based on augmented reality. The goal is to explore the former circus base and learn while having fun. Technologically, the game is based on Unity engine and written in C#. It is a free download from the Apple Store, but requires AR markers, which are available in Julinek Park.
Major contributions
- Development in Unity
- Bugs resolving
- Submitting to the App Store
Project Koch (NDA)
fast ordering & delivery platform
E-commerce platform for ordering consumer products with fast delivery (within a few hours) in an eco-friendly way. Service is available to individuals and businesses. From ordering to delivery to return logistics and reordering, the entire supply chain is supported. Frontend application in a modern React-based framework and onion architecture under the hood. Microservices built on a lightweight Ruby framework and powered by a distributed event streaming platform.
Major contributions
- Development in Sinatra (Ruby)
- Customer Accounts Authentication service
- React frontend development (Next.js)
Project Julia (NDA)
digital education platform
Global learning platform offering online courses from universities worldwide. The platform supports millions of users and thousands of courses across a broad range of industries. Partners (universities, organizations, industry partners, and government partners) create different types of courses in the app. These include MOOCs (Massive Open Online Courses), ExpertTrack, microcredentials, and degrees. Technologically, the application is a modular backend in Ruby on Rails with a React-based frontend.
Major contributions
- Development in Ruby on Rails
- User conversion experiments
- GDPR compliance tools
- Frontend development in React
nopaperwork
business management application
Management business with no paperwork. Customer service, create invoices, order management. All in one place, easy-to-use and painless. Available API in standard JSON API (in progress).
Major contributions
- Backend development in Ruby on Rails
- Integration with polish e-Invoicing (Polish KSeF)
- Updating Rails to version 7.x
- Implementation of importmaps
- Updating Bootstrap 3 to Bootstrap 5
- Frontend development in Ember.js
- Create documentation using Swagger
This is our company website. It shouldn't be complicated. The task of this site is to show what and how we do. We work on it in our free time. The project is public and anyone can look at the code.
Major contributions
- Updating Rails to version 7.x
- Implementation of importmaps
- Updating Bootstrap 3 to Bootstrap 5
Major contributions
- Configuration and administration
- Copywriting
Application supporting design hand-made ceramic tiles. Users can choose the shapes, patterns and colors. Ordering process is a multi-step and requires an individual valuation, because the tiles are manufactured by hand.
Major contributions
- Backend development in Ruby on Rails
- Bugs resolving
- Deployment to staging
hitdea
based on microservices
Collaborative web-based platform for idea management. It allows to empower people to gather ideas but also process them in a creative, productive and simple way. Based on the methodology CPS 6.1 (Creative Problem Solving).
Major contributions
- Backend development (Ruby on Rails, Cordova)
- Developing Cordova application
- Frontend development (Ember.js)
- Developing microservice architecture
- Developing API
linguistic analysis
Linguistic analysis system is used for word processing and automatic category detection. The application can also detect the language of the text. The database contains over 6 million words in Polish and English. The system has a learning mode with a teacher and the categorization is based on statistical methods. Application provides an external API.
Major contributions
- Backend development in Ruby on Rails
20 questions game
Logic game which learns with every play. In the game you have to answer questions asked by the AI and it will try to guess what were you thinking about.
Major contributions
- Backend development in Ruby on Rails
- Frontend development
- Designing and implementation of the game logic
- Implementation of an administration panel
- Database design
- Writing unit and acceptance tests
- Creating translations
- Taking care of framework updates
- Designing zero state application