Olena

OLENA SAVYTSKA
Frontend Developer | React · Next.js · TypeScript
Kyiv, Ukraine | [відкрити контакти](див. вище в блоці «контактна інформація») | [відкрити контакти](див. вище в блоці «контактна інформація»)
LinkedIn | GitHub | Portfolio

PROFESSIONAL SUMMARY
Frontend Developer with 3+ years of commercial experience building web applications using React, Next.js,
and TypeScript, including SaaS platforms, admin dashboards, PWAs, and Telegram Mini Apps. Experienced
in AI-assisted development with Claude Code and LLM API integration. Skilled in frontend architecture, state
management, and performance optimization, with measurable results including Lighthouse Performance scores
of 99+ and a 70% reduction in redundant API requests.

TECHNICAL SKILLS
Frontend: JavaScript (ES6+), TypeScript, React, Next.js (App Router), HTML5, CSS3, SCSS, Vite
UI & Styling: Tailwind CSS, Material UI, shadcn/ui, Framer Motion, responsive design
State & Data: Zustand, TanStack Query, Redux Toolkit, React Context
Forms & Validation: React Hook Form, Formik, Zod
Testing & Quality: Jest, React Testing Library, Playwright, Storybook
API & Auth: REST APIs, NextAuth, Clerk, OAuth 2.0, Supabase
AI & Development Tools: Claude Code, Vercel AI SDK, LLM API integration
Additional Technologies: React Native (Expo), Node.js, Express, PostgreSQL, MongoDB, Prisma, Docker
Practices: Performance optimization, accessibility, i18n (next-intl), SEO
CI/CD & Tools: Git, GitHub Actions, GitLab, Vercel, Figma, Jira, ClickUp

PROFESSIONAL EXPERIENCE
Freelance
Frontend Developer | April 2025 - Present
- Developed and delivered production web applications, a Chrome extension, and marketing websites
using React, Next.js, and TypeScript, working directly with clients from requirements gathering to
deployment.
- Xscore Agency (Web3 Platform): Developed campaign discovery, task management, rewards,
progress tracking, and user dashboards. Created responsive marketing and platform landing pages using
Next.js and Framer Motion.
- Twitter/X Analytics Chrome Extension: Implemented client-side caching with a 30-minute TTL,
reducing redundant API requests by approximately 70%.
- Active Wooden Horse: Built an internal survey application with multi-step forms, internationalization,
and REST API integration using React, TypeScript, and Vite.
- Marketing Websites: Developed pixel-perfect, responsive websites from Figma using Next.js and
Tailwind CSS. Achieved Lighthouse Performance scores of 99+ through lazy loading, code splitting,
and image optimization, while improving SEO and accessibility.
- Managed client state with Zustand and server state with TanStack Query, implementing caching and
data synchronization.

VERV Digital
Frontend Developer | September 2023 - March 2025
- Developed and maintained SaaS platforms, admin dashboards, and Telegram Mini Apps in an Agile
team with designers, backend developers, and QA engineers, participating in code reviews.
- BrawlDrop (Gaming PWA & Admin Console): Developed a React PWA with offline support using
Workbox and IndexedDB, alongside an admin dashboard featuring ECharts analytics, scheduling,
complex forms, and JSON editing.
- XBKS (Telegram Mini App & Admin Console): Developed a game-style Mini App using SolidJS,
PixiJS, Telegram Apps SDK, and TON Connect, alongside a React admin console with CSV
import/export, scheduling, and form validation.
- Built reusable UI components, data tables, filtering, search, and pagination within a modular, layered
frontend architecture.
- Integrated REST APIs, managed server state with TanStack Query, refactored legacy code, and
supported i18n, RTL, and CI/CD workflows.

Frontend Developer Intern | March 2023 - August 2023
- Developed responsive e-commerce interfaces from Figma using React and TypeScript.
- Implemented reusable UI components, forms, validation, authentication flows, and REST API
integrations.
- Participated in code reviews and collaborated with senior developers.

PERSONAL PROJECTS
WordTrainer | AI Language-Learning App
Live | GitHub
Built a Next.js application featuring AI-powered translations, contextual examples, flashcards, and interactive
vocabulary games. Integrated Supabase authentication and storage, AI SDK, and Telegram API.
Tech: Next.js 16, TypeScript, Supabase, Zustand, AI SDK, shadcn/ui

Iron Track | Full-Stack Fitness Tracker
Live | GitHub
Developed a workout tracking application with authentication, custom exercises, progress analytics, interactive
charts, multilingual support, and dark mode.
Tech: Next.js 15, TypeScript, MongoDB, Mongoose, NextAuth, Zustand, Recharts

EDUCATION & CERTIFICATIONS
- Frontend Development (Basic & Pro) | Hillel IT School | 2022 - 2023
- JavaScript | Udemy
- Node.js Essential | ITVDN
- Master's Degree in Ecology | Donetsk National Technical University | 2004 – 2010

LANGUAGES
Ukrainian: Native | English: B1 (Intermediate)