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Maciej – Typescript, JavaScript, React, experts in Lemon.io

Maciej

From Poland (GMT+2)

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Front-end Web DeveloperSenior
Hire developer
17 years of commercial experience
Asset management
Banking
Fintech
Marketplace
Trade
Communication tools
CRM
Enterprise software
Platforms
Lemon.io stats
1
projects done
546
hours worked
Open
to new offers

Maciej – 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.

Main technologies
Typescript
4 years
JavaScript
5 years
React
4 years
Additional skills
Redux
React Hooks
MobX
WebSocket
Grid
ECMAScript 6
HTML
SCSS
Docker
Mocha
Enzyme
Jest
Styled-components
LESS
Moment.js
SASS
Rewards and achievements
June 2024: Olya Summary
Ready to start
ASAP
Direct hire
Potentially possible

Experience Highlights

Senior Frontend Developer
Jan 2021 - Dec 202111 months
Project Overview

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.

Skeleton
Skeleton
Skeleton
Responsibilities:
  • 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.
Project Tech stack:
React
React Hooks
Typescript
MobX
WebSocket
ag-Grid
Jest
Git
Senior Frontend Developer
Jan 2020 - Dec 202011 months
Project Overview

Project for a leading bank in Iceland to replace a set of customer service applications with a single web solution.

Skeleton
Skeleton
Skeleton
Responsibilities:
  • Delivered required functionalities;
  • Analyzed and improved app's performance;
  • Performed backlog refinement and code review of each PR;
  • Did unit testing.
Project Tech stack:
React
React Hooks
Redux
ECMAScript 6
SASS
Jest
Moment.js
i18next
ag-Grid
Git
Lead Developer
Apr 2019 - Dec 20198 months
Project Overview

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.

Skeleton
Skeleton
Skeleton
Responsibilities:
  • 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.
Project Tech stack:
React
React Hooks
Redux
ECMAScript 6
Styled-components
LESS
Jest
i18next
date-fns
Git
Senior JavaScript Developer
Jan 2019 - Mar 20192 months
Project Overview

A project developed to allow customers to create their own distributed ledgers, and manage the nodes and applications permitted to connect to them.

Skeleton
Skeleton
Skeleton
Responsibilities:
  • 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.
Project Tech stack:
React
Redux
Typescript
ECMAScript 6
WebSocket
HTML
CSS
SCSS
Jest
Enzyme
Docker
Git
JavaScript Developer
Jul 2018 - Dec 20185 months
Project Overview

The prototype illustrated the potential viability of using distributed ledger technology (DLT) as a core component of HKEX’s strategic infrastructure.

Skeleton
Skeleton
Skeleton
Responsibilities:
  • 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.
Project Tech stack:
React
Redux
Typescript
ECMAScript 6
WebSocket
HTML
CSS
SCSS
Mocha
Enzyme
Docker
Git
JavaScript Developer
Jan 2018 - Jun 20185 months
Project Overview

The project aimed to standardize and automate cash notifications to minimize risk and optimize efficiency. The client was a British multinational asset management company.

Skeleton
Skeleton
Skeleton
Responsibilities:
  • Implemented new features;
  • Fixed bugs;
  • Did unit testing.
Project Tech stack:
React
JavaScript
ECMAScript 6
HTML
CSS
CSS
Semantic UI
Git
Azure DevOps Server
Scrum

Education

2014
Computer Science
Master's
2014
Computer Science
Master's

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