Jan – JavaScript, React, Node.js

This is a mobile APP that allows users to easily follow, manage, and analyze users' favorite NFT collections - for free. The main features he was working on were:

• A new version of application landing page(React.js, Nest.js)
• Supporting push notifications on the backend - sending daily push notifications about price changes, making it possible to subscribe/unsubscribe notifications, integration with One Signal _Setup AWS backend infrastructure over Terraform(Database, API Gateway, SNS, MongoDB Atlas Search indexes) _Creating Lambda microservices that can fetch and persisting data about NFTs

• created front-end and back-end architecture;
• reimplement the existing front-end;
• debugged and resolved the application issues;
• wrote unit, integration, and e2e tests;
• integrated with different providers;
• increased the performance of the app.

A medical facility that provides online telemedicine services, focusing on contraception and the treatment of impotence. The team consists of qualified Polish doctors who work in clinics and hospitals in and around Warsaw. The work of doctors is based on a medical interview based on an intelligent e-consultation form. Contact with the doctor is anonymous and safe - the patient does not have to make an appointment for a specific date and time of the visit - he can send an e-consultation request at any time. After its verification by the doctor, the patient receives a four-digit e-prescription code with which he can buy the drug at any pharmacy in Poland.

• created a microservice frontend application layer based on business requirements; • cooperated with backend programmers and UX / UI designers; • maintained existing user interfaces and created new functionalities; • designed a clear and sustained application architecture on all levels of abstraction; • performed code decomposition on reusable libraries (Angular, TypeScript, JavaScript); • integrated frontend solutions with the backend platform through the REST API; • shared knowledge, conducted code review; • wrote a good code according to the “clean code” rules; • wrote unit and integration tests.

Development of government Portal that provides public data to citizens following the WCAG 2.1 standard. This is a one-stop-shop for data from over 100 public institutions. The website is a source of reliable, constantly updated data, made available free of charge for re-use. An up-to-date list of data providers is available in the Suppliers section.

They have created this website for:

• citizens interested in the activities of the state;
• companies that build innovative products and services based on data;
• NGOs using data in their daily work;
• scientists carrying out research;
• officials preparing reports and analyses.

Achievements: • Despite the fact that Jan was the youngest developer on the project, backend developers advised with Jan when they needed help in frontend technologies; • Because of tempo of his work, tasks were reassigned to me from other developers in order to be finished in time; • Jan was able to solve issues that were waiting in the project backlog as former team members were unable to close it.

​ Responsibilities: • created a microservice frontend application layer based on business requirements; • cooperated with backend programmers and UX / UI designers; • maintained existing user interfaces and created new functionalities; • designed a clear and sustained application architecture on all levels of abstraction; • performed code decomposition on reusable libraries (Angular, TypeScript, JavaScript); • integrated frontend solutions with the backend platform through the REST API; • shared knowledge, conducted code review; • wrote a good code according to the “clean code” rules; • wrote unit and integration tests.

This is one of the leading project management tools used by over 30 000 teams from companies worldwide. Products are used by CEOs, Managers, Directors, and Project Managers of companies such as Netflix, NASA, Tesla, Apple, Uber, Samsung, Porsche, Siemens, Intel, Boeing, LG, and many more.

​ • created a microservice frontend application layer based on business requirements; • cooperated with backend programmers and UX / UI designers; • maintained existing user interfaces and created new functionalities; • designed a clear and sustained application architecture on all levels of abstraction; • performed code decomposition on reusable libraries (Angular, TypeScript, JavaScript); • integrated frontend solutions with the backend platform through the REST API; • shared knowledge, conducted code review; • wrote a good code according to the “clean code” rules; • wrote unit and integration tests.

This is the most popular shopping platform in Poland and one of the largest e-commerce websites in Europe (10th most visited e-commerce worldwide). 20 million users per month use it. 1500+ microservices, 60k rps.

• ​created a microservice frontend application layer based on business requirements; • cooperated with backend programmers and UX / UI designers; • maintained existing user interfaces and created new functionalities; • designed a clear and sustained application architecture on all levels of abstraction; • performed code decomposition on reusable libraries (Angular, TypeScript, JavaScript); • integrated frontend solutions with the backend platform through the REST API; • shared knowledge, conducted code review; • wrote a good code according to the “clean code” rules; • wrote unit and integration tests.