Maciej
From Poland (GMT+2)
18 years of commercial experience
Lemon.io stats
1
projects done546
hours workedOpen
to new offersMaciej – Typescript, JavaScript, React
Maciej is a seasoned Front End Developer who have worked with Js, Ts and React.js ecosystem for a great share of his career, has vast experience in many domains and projects of different scale. To develop a new app from scratch is an easy task for him, as well to design its architecture. Maciej will be a great asset to any project with his nice soft and hard skills.
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Potentially possibleExperience Highlights
Senior Frontend Developer
A digital market for institutional investors created by one of the largest investment banks in the world, delivering unparalleled, cross-asset access to global markets.
- Created new functionalities based on business requirements, often associated with large amounts of data and WebSocket communication;
- Added new graphs based on the D3 library;
- Fixed errors in existing applications;
- Expanded the library of UI components;
- Wrote unit tests;
- Created E2E tests using the client's framework.
Senior Frontend Developer
Project for a leading bank in Iceland to replace a set of customer service applications with a single web solution.
- Delivered required functionalities;
- Analyzed and improved app's performance;
- Performed backlog refinement and code review of each PR;
- Did unit testing.
Lead Developer
A project aimed to replace the old Flex application with a modern React interface and improve the skills of client programmers. The client was a Chinese bank.
- Created React app architecture;
- Delivered required functionalities;
- Conducted discussions with design and product teams;
- Analyzed and improved app's performance;
- Reviewed other developers' code;
- Resolved urgent problems to keep the team running;
- did unit testing.
Senior JavaScript Developer
A project developed to allow customers to create their own distributed ledgers, and manage the nodes and applications permitted to connect to them.
- Set up React application;
- Developed functionalities against mocked API;
- Coordinated UI work;
- Helped Product Owner to manage product backlog;
- Integrated with dockerized client's API;
- Created UI testing stack;
- Did unit testing.
JavaScript Developer
The prototype illustrated the potential viability of using distributed ledger technology (DLT) as a core component of HKEX’s strategic infrastructure.
- Created React app architecture and developed the app from scratch;
- Coordinated UI work;
- Introduced WebSockets and ensured real-time application state;
- Built expanded testing stack;
- Designed API;
- Did unit testing.
JavaScript Developer
The project aimed to standardize and automate cash notifications to minimize risk and optimize efficiency. The client was a British multinational asset management company.
- Implemented new features;
- Fixed bugs;
- Did unit testing.