Bartłomiej Patrzyk

A crowdsourcing app for a developing country market where users could perform various tasks in exchange for a reward. The mobile app was available for Android and iOS and developed in React Native. The back end was leveraged with Java and Kotlin with the Spring Boot framework. The data was stored in MongoDB and PostgreSQL databases.

Technologies: Java, Kotlin, Spring Boot, Hibernate, MongoDB, PostgreSQL, JavaScript, React Native, Heroku, AWS (S3, Elastic Beanstalk, EC2, VPC), CircleCI

The project's primary objective was to design and build a highly customizable eCommerce platform for the airline and travel industries. With Java on the back end and React on the front end, the application was architected to be highly scalable and easily extensible to facilitate the needs of different customers.

Technologies: Java, Spring, MongoDB, JavaScript, React, Redux, AWS (VPC, EC2, S3, ElastiCache), Terraform, Ansible, Docker, Jenkins

The project's main goal was to create a central place where the employees could manage critical business data. The application needed to be integrated with existing systems and tools. The back end was implemented in Java, and the front end was implemented in React. The application included SAML single sign-on that was integrated with Active Directory.

Technologies: Java, Spring, Hibernate, Oracle Database, JavaScript, React, Redux, AWS (VPC, EC2, S3), Shibboleth, Jenkins

A robust SOAP API implemented in Node.js with a MySQL database that acted as a type of middleware between SAP and a legacy ERP application. The back end periodically imported data from the SAP database and exposed it to the front-end application used by the operations team. The biggest challenge was to ensure data integrity and optimize database queries.

Technologies: JavaScript, Node.js, MySQL, Sequelize, Heroku, AWS S3

A web app for controlling and visualizing the state of AC/ventilation units. It allowed the users to change the machine's parameters and state manually or using simple automation rules. The application leveraged the Modbus protocol for communicating with the Unit's PLC.

The app was designed to guide tourists through the trails of a landscape park. Users can access interactive educational content about local fauna and flora by scanning QR codes found on the trail. The app also contained a quiz where users could test their knowledge and compete with other tourists.

Technologies: Android, OpenStreetMap, Retrofit, RoboSpice, QR code scanner

A mobile app intended for people who are looking for training buddies. It allows users to search for other users interested in the same sports disciplines and arrange to train together. It also made it possible to browse sports events that were taking place near a user's location.

Technologies: Android, Google Maps SDK, Retrofit, RoboSpice

An Android app that allowed users to look for interesting events near their location. The app included social media features such as friends lists, in-app chats, and check-in functions. Moreover, the application allowed the user to notify their friends in case of an emergency and included a simple navigation feature in case one got lost. Furthermore, it allowed business owners to promote their events by giving users free vouchers and notifying them about new promotions.

Technologies: Android, Google Maps SDK, Retrofit, RoboSpice

Shor’s factoring algorithm is one of the fundamental algorithms in quantum computer science. For my master’s thesis, I implemented the simulation of multiple optimization variants of the algorithm and analyzed their performance.

Technologies: C#

A programmable logic controller (PLC) program that controlled machines that built car fuel hoses. The main objective of the software was to precisely control the heating and cooling of the part and the movement of the actuators that were installing hose connectors. With a custom temperature control algorithm, it was possible to reduce the overall process duration and increase productivity. The program was developed in compliance with internal quality assurance standards and health and safety regulations.

Technologies: PLC, Ladder Logic, Modbus