Aloha. My name is Roman. I am a front-end developer with 8+ years of experience. In particular, 6+ years of development in the react ecosystem. Detail-oriented and self-driven. Able to self-manage effectively during independent projects, as well as collaborate as part of a productive team. I have a keen interest in modern frontend technologies, significant experience in developing complex web applications on react.js, and persistence in problem-solving. As a specialist, I aim to develop engineering skills, study architecture, code quality, and complex systems. The vector of personal development is aimed at time management and efficiency increasing.

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• Email: dev.iz9.l.n@gmail.com
• Linkedin: linkedin.com/in/roman-kovalchuk-iz9
• Telegram: t.me/webiz9
• Github: github.com/iz9

• JavaScript
• TypeScript
• HTML
• CSS (SCSS)
• Bash
• Python

• React.js, react-router, react-intl, react-query
• Redux, rtk, redux-saga, reselect, Mobx
• Next.js
• jwt, axios,
• styled-components, styled-system, css frameworks (MaterialUI, Bootstrap, TailwindCSS)

• Unit testing
• TDD
• OOP
• SOLID Design Principles
• familiar with software development processes (Agile, Scrum)

• npm, git
• webpack, parcel, babel, vite
• jest, react-testing-library, storybook
• eslint, stylelint, prettier, husky,
• plop, yeoman

• REST API
• WebSocket(signalR, ws, socket.io)
• NoSQL(MongoDB)
• NodeJS (express, Nest.js)
• Linux (Debian/Ubuntu desktop, server)
• Docker, CI\CD (gitlab)
• AWS (Lambda, Amplify), GCP
• Angular

• English (Intermediate)
• Russian (fluent)
• Ukrainian (native)

May 2018 - Dec 2020, Kharkiv, Ukraine

Trading platform that combines daily fantasy point scoring and ever-popular financial trading.
The frontend team was developing two products (with some shared code like UI components lib, typings, utility helper lib):

1. SPA for users
2. Admin panel for operators. As part of the frontend team I did the following:

• UI development using React.js and React ecosystem.
• Development of the high-load client-side SPA with complex business logic.
• Building reusable components and front-end libraries for future use.
• Test development (unit testing)
• Troubleshooting interface software and debugging application codes.
• Monitoring and improving front-end performance.
• Design a scalable web-app architecture, easy to support continuously.
• Performing the full cycle of software delivery, from design to post-release support.
• Workflow organization.
• Set up and update/support a project dev environment for ReactJS.
• Continuous-integration setup.
• Project refactoring.
• Working with customers to transform product concepts into technical specifications.
• Collaborating with software developers and designers.
• Reviewing application requirements and interface designs.
• Code review
• Tasks specification.
• Sprint planning.
• Documenting application changes and developing updates.
• Project support and consulting.

Technologies and tools: typescript, es6+, babel, react, react-router, react-intl, redux, redux-toolkit, redux-saga, styled-components, materialUI, storybook, formik, yup, axios, signalR, jwt, webpack, jest, react-testing-library, redux-saga-test-plan, eslint, ts-lint( until deprecation), lerna, AWS (Amplify), CI/CD (TeamCity, AWS)

Apr 2017 - Jun 2018, Kharkiv, Ukraine

Fantasy sports betting platform. As part of the frontend team I did the following:

• UI development using React.js and React ecosystem.
• Create data visualization tools.
• Test development (unit testing)
• Troubleshooting interface software and debugging application codes.
• Monitoring and improving front-end performance.
• Performing the full cycle of software delivery, from design to post-release support.
• Workflow organization.
• Continuous-integration setup.
• Working with customers to transform product concepts into technical specifications.
• Collaborating with software developers and designers.
• Reviewing application requirements and interface designs.
• Code review
• Tasks specification.
• Documenting application changes and developing updates.

Technologies and tools: typescript, es6+, babel, react, react-router, react-intl, redux, redux-thunk, styled-components, formik, yup, axios, socket.io, jwt, webpack, jest, eslint, ts-lint, stylelint, CI/CD (gitlab)

Feb 2016 - Mar 2017, Kharkiv, Ukraine

Betting platform, where users can make bets and track statistics of different events of a huge variety of different areas. As part of the frontend team I did the following:

• UI development using React.js and React ecosystem.
• Test development (unit testing)
• Troubleshooting interface software and debugging application codes.
• Monitoring and improving front-end performance.
• Code review
• Tasks specification.

Technologies and tools: es6, babel, react, react-router, react-intl, redux, redux-thunk, SCSS, axios, socket.io, webpack, jest, eslint, stylelint

Nov 2015 - Mar 2016, Remote

A web application built on top of google maps to find the nearest coffee shop or fast food outlet and order online for a certain time. As part of the frontend team I did the following:

• UI and business logic development using Angular.js
• Troubleshooting interface software and debugging application codes.
• Monitoring and improving front-end performance.

Technologies and tools: es5, Angular.js, SCSS, gulp, google maps API

Sep 2014 - Nov 2015, Remote

Various websites on WordPress. E-commerce website built on Prestashop CMS.

• HTML/CSS coding.
• Simple JS coding.
• Implementing design into html document.
• Troubleshooting and debugging.
• Configuring and extending WordPress websites.
• Configuring and integrating Prestashop CMS into the existing workflow of the offline shop.
• Working with customers to transform product concepts into technical specifications.
• Collaborating with software developers and designers.

Technologies and tools: es5, HTML, PHP, SCSS, gulp, WordPress, Prestashop CMS, jQuery, Bootstrap, nginx, git, filezilla