Volodymyr

VOLODYMYR SYDOROVSKYI
Senior Frontend Developer · React · TypeScript · Redux · HTML / CSS
Kraków area (Trzebinia), Poland · Remote · B2B via own company (JDG) · English B2
[open contact info](look above in the "contact info" section) · [open contact info](look above in the "contact info" section) · [open contact info](look above in the "contact info" section)
[open contact info](look above in the "contact info" section) · github.com/wladimir1982 · Telegram: @Gammi_Bearr

SUMMARY
Senior Frontend Developer with 7+ years of commercial experience in React, TypeScript, JavaScript (ES6+) and
Redux, with a real passion for markup: builds responsive pages and reusable components from design mockups
with HTML5, CSS3, Sass / SCSS, Less, BEM methodology and Bootstrap. Experienced with marketplace products
(marketplace admin on a US fintech platform, job marketplaces, an online store), integrating RESTful APIs with
Axios and Fetch, and bundling with Webpack. Writes tests with Jest and React Testing Library (plus Cypress) to keep
code quality high and reduce bugs, applies web application security principles (OWASP Top 10, secure
authentication), and regularly optimizes and refactors code (Node.js migrations, full UI redesign, state management
refactoring). Works closely with backend developers and designers, takes part in code reviews, and is comfortable
with ownership and freedom of action.

SKILLS
Core: React 18, TypeScript, JavaScript (ES6+), HTML5, CSS3, React Router
React frameworks: Next.js, Remix, Gatsby
Markup & styling: Markup from design mockups (Figma), responsive design, BEM, Sass / SCSS, Less, Bootstrap,
Styled Components, Tailwind CSS, Material UI, Ant Design, Storybook, reusable components, WCAG accessibility,
React Hook Form, Formik
State & APIs: Redux, Redux Toolkit, RTK Query, Zustand, React Query, RESTful APIs, Axios / Fetch, GraphQL,
WebSockets
Testing & quality: Jest, React Testing Library, Cypress, ESLint, Prettier, code review, refactoring and optimization
Security: Web application security principles, OWASP Top 10, JWT authentication
Build & tools: Webpack, Vite, Git, npm / Yarn, micro-frontends, Node.js version migrations
Domain expertise: Marketplaces and e-commerce, fintech, enterprise dashboards and analytics, secure document
processing, i18n (Smartling, Contentful)
Also worked with: Node.js, Express, MongoDB, Firebase, JWT · React Native, Flutter / Dart
Practices & tools: SOLID, design patterns, refactoring legacy code, Scrum · Figma · AI-assisted development
(Claude, Junie, ChatGPT)

EXPERIENCE
Frontend Software Engineer (React) 04.2025 – Present
Confidential company (NDA) · Remote
Enterprise admin dashboards for secure document processing, real-time data and analytics in a security-sensitive
environment.
• Designed the frontend architecture of the dashboards on React 18, TypeScript and Vite.
• Integrated WebSockets for live data updates and EDS (electronic digital signature) so users can sign documents
directly in the browser.
• Integrated RESTful APIs with Axios, working closely with backend developers.
• Moved state management to Zustand, which made the code easier to maintain and extend.
• Built interactive business analytics views with Ant Design Charts.
• Set up ESLint / Prettier rules and took part in code reviews to keep quality consistent across the team.
Stack: React, TypeScript, Zustand, Vite, Ant Design, Ant Design Charts, SCSS, Formik, Axios, REST API, Day.js,
Lodash, WebSockets, EDS
Frontend Software Engineer (React) 05.2021 – 04.2025
Capgemini Engineering · Odesa, Ukraine · Hybrid
Client: Affirm, US fintech (buy now, pay later) · 05.2021 – 10.2022 · micro-frontend platform
• Marketplace admin: delivered new features and fixes for the internal marketplace admin application (React,
Redux, Bootstrap, SCSS); covered code with Jest unit tests and Cypress end-to-end tests.

• Web accessibility: brought the UI in line with WCAG: keyboard navigation, accessible UI components and
accessibility testing.
• Node.js migration: upgraded applications from Node.js 10 to 12 and then 14, updating dependencies to
improve performance, security and stability.
• Internationalization: implemented multi-language support with i18n, Smartling and Contentful, with content
shown according to the user's locale.
• Analytics: integrated user-behaviour tracking that the product team used to improve the UX.
• Collaboration: worked in a distributed international team with the client product managers, designers and
backend engineers.
Internal products · 10.2022 – 04.2025
• Smart Skills (talent search integrated with the company LMS): worked on a complete UI redesign, added
features from business requirements and wrote unit tests with React Testing Library.
• CV Template: designed and built responsive CV templates with React, TypeScript and Tailwind CSS, connected
to the employee database.
Stack: React, TypeScript, Redux, Redux Toolkit, RTK Query, Tailwind CSS, Material UI, SCSS, Formik, Webpack, Jest,
React Testing Library, Cypress, Node.js
Frontend Developer 03.2019 – 04.2021
ZenBit Tech · Odesa, Ukraine
• Band: platform for bands, artists and fans with an online store and built-in messenger. Built responsive, cross-
device pages from design mockups in React and TypeScript, reusable components in Storybook and real-time
chat over WebSockets; also worked with the Node.js / Express backend.
• STEMI: telemedicine app that helps paramedics and cardiologists manage heart-attack and stroke patients.
Built the React Native frontend with Firebase Cloud Messaging push notifications.
• Pitch59, RM Relaunch: job-search and e-learning mobile apps for iOS and Android in Flutter / Dart, with Google
Maps integration and UI animations.
• MrJobs: job marketplace web app built with React, GraphQL and Firebase, with Google API integrations.
Stack: React, TypeScript, React Native, Redux, React Query, Ant Design, Styled Components, Storybook, React Hook
Form, Node.js, Express, MongoDB, Firebase, Flutter

EDUCATION
Beetroot Academy – Front-end Development course
Odesa National Academy of Food Technologies – Specialist degree (Master's equivalent), Food Technology

LANGUAGES
Ukrainian: native · English: B2 (upper-intermediate) · Polish: A2 (elementary), learning
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