Yevhen – JavaScript, Typescript, React

A rising startup, the main goal is data analysis for mobile game developers on both IOS and Android platforms. Main features:

• high speed on billions of lines of data,
• revenue predictions,
• paying statistics calculations.

• Creating both the main app and admin panel from scratch on the front-end side
• New features integration, such as tables with custom sorting, draggable columns, and other tools
• Implementing auth service both on the front-end and back-end side
• Creating CRUD API methods for the data changing
• Refactoring of the back-end side
• Integrating with the new clients, providing custom users and config presets on the back-end side

The cryptocurrency platform is based on the ERC20, which mission was to provide fast and secure transactions with minimal fees. Very simple UI with powerful tools which satisfy all user demands.

• Chose technologies and built the application from scratch
• Implemented different ways of authorization through the different ETH vendors, such as Metamask, Coinbase, Fortmatic, etc
• Implemented transaction support via an internal package
• Covered with unit tests
• Implemented new features
• Fixed bugs
• Covered demo
• Built and deployed to the Firebase
• Worked with the customer directly

The goal of the product is to check the code base of customers' applications for various aspects of security vulnerabilities. Main features:

• fast scans,
• dashboards comparison,
• big pressure stability.

• Did the integration with Gitlab, Bitbucket, and Azure, configuration routing via Nginx
• Implemented complex table support
• Supported with development of an online code editor as part of the web application
• Fixed code and package vulnerabilities
• Prepared web application for customer demo and launch
• Did code review
• Migrated to the latest Mobx and React versions and refactoring, reconfiguration of the webpack for a better local development experience
• Did the optimization of complex tables, bug fixes, implemented new features

An application for online banking, the mission of which is to provide a service for fast and convenient money transactions between Eastern European countries.

• Developed the system from scratch for pre-building pages with data fetched from GraphQL
• Implemented custom internationalization
• Developed custom Gatsby plugins
• Implemented new features by customer request technical support for the SEO team
• Covered refactoring and optimization of the old code base, bug fixes, and style improvements

Gambling app for Canadian and Australian audiences. Authentic games, cryptocurrency acceptance.

• Created responsive UI and menus for gambling games
• Supported migrating to the Micro Front-end architecture
• Tested coverage with Jest
• Supported implementing SSR
• Implemented new features by roadmap and customer request
• Fixed bugs and improved SEO optimization