Олег

Oleh Halchenko
Front-end Developer
Contact Information:
• Phone: [відкрити контакти](див. вище в блоці «контактна інформація»)
• Email: [відкрити контакти](див. вище в блоці «контактна інформація»)
• LinkedIn: [відкрити контакти](див. вище в блоці «контактна інформація»)

Skills:
• Languages & Frameworks: JavaScript (ES6+), TypeScript, React.js, Next.js
• UI & Styling: Tailwind CSS, SCSS, Material UI, Ant Design, Radix-UI, ShadCN UI
• State Management: Zustand, Redux Toolkit, React Query, useContext
• Backend & APIs: REST API, Supabase Functions, GraphQL (Apollo), WebSockets, PostgreSQL, Prisma
• Auth & Security: NextAuth.js, Supabase Auth, Payment gateway integration (Stripe-like flows)
• Tooling: Vite, Vercel, AWS (S3, Lambda), Turborepo, PNPM, Git, GitHub, Bitbucket
• Design & Workflow: Figma, responsive/adaptive design, component-driven architecture, Jira,
Confluence
• Localization: i18next

Professional Summary:
Front-end Developer with 3 years of experience delivering high-performance, user-focused web applications. Strong
expertise in React.js, Next.js, and modern front-end architectures, with hands-on experience building complex UI
components, and scalable API integrations. Successfully delivered solutions for e-commerce and fintech platforms,
improving load times, usability, and development workflows in both individual projects and Agile teams. Experienced
in end-to-end product development, from authentication and session management to publishing workflows and real-
time data handling.

Work Experience:
Front-end Developer - Xpaid UAB / Feededify | Sep 2024 – May 2026
• Developed a template builder for product dynamic advertising, automating the creation of ad banners. Built
FeedEdifyEditor from scratch — a visual template builder for context-driven dynamic ad banners, enabling
full visual customization without developer involvement.
Implemented Supabase-based authentication and session restoration with secure auto-redirect from the
dashboard into the editor. Created a complete template publishing process.
• Participated in the development of fintech and blockchain products, including a cryptocurrency–fiat
exchange platform and a crypto wallet application. Worked on responsive UI implementation, API
integrations, authentication flows, and user-facing financial features in a team environment.

Front-end Developer - Freelance | Jun 2024 – Aug 2024
• Designed and developed a full-stack e-commerce platform for consumer electronics: responsive storefront,
admin panel with NextAuth.js authentication.
• Implemented catalog, cart flow, and product display. Used Prisma + PostgreSQL for data layer.
• Integrated third-party APIs for payment processing and order management, optimizing load times and
accessibility.

Front-end Developer - AppsDelivered, Inc. - Florida, USA | Apr 2023 – May 2024
• Developed user interfaces for web applications, including creating websites using React and migrating them
to Next.js , improving SEO and page speed scores.
• Collaborated on designing and improving the UI for the AI chatbot widget "Await Cortex" and the candidate
database "UsersDB".
• Created and managed content with ButterCMS, integrating Close CRM for client data management and
customer engagement.
• Integrated front-end applications with back-end systems via APIs and database connections.

Languages:
• Ukrainian: Native
• English: Intermediate
• Russian: Native

Education:
Master's Degree, Metal Forming National Metallurgical Academy of Ukraine 2009 – 2014