Григорій

Hryhorii Yarko

Full-Stack Engineer
Kostopil, Rivne region, Ukraine · [відкрити контакти](див. вище в блоці «контактна інформація») · [відкрити контакти](див. вище в блоці «контактна інформація») ·
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PROFESSIONAL SUMMARY
Full-Stack Engineer with 7+ years of commercial experience, primarily working with
React and TypeScript. I typically own the frontend side of a product, from
architecture and design systems to reusable components and performance,
including Next.js SSR. Current work is an agentic AI platform that automates
software testing. I helped build the frontend from the ground up and, since March
2026, have also been shipping backend endpoints with Python and FastAPI. Earlier
experience in QA still shows in how I approach edge cases and regressions.

TECHNICAL SKILLS
Programming Languages: TypeScript, JavaScript, Python
Frontend: React, Next.js, HTML5, CSS3
UI & Design Systems: Shadcn UI, Radix UI, Storybook, Figma
CMS: Storyblok
Forms & Validation: React Hook Form, Formik, Zod
State Management & Data Fetching: Redux, Redux Toolkit (RTK), Zustand,
TanStack Query (React Query)
Styling: Tailwind CSS, CSS Modules, SASS/SCSS, Styled Components, Emotion
Data Visualization & Tables: Recharts, TanStack Table
Backend & Databases: FastAPI, MySQL, MongoDB
Networking & APIs: REST APIs, WebSockets, Axios
Testing: Jest, React Testing Library
AI-Assisted Development: Cursor, Claude Code
Build Tools: Vite, Webpack
DevOps & Version Control: Docker, CI/CD, Git
Collaboration: Agile, Scrum, Jira, Slack, Trello, Redmine

PROFESSIONAL EXPERIENCE
IntellectSoft
React / Full-Stack Developer
March 2024 - Present
Project: Agentic AI platform that automates the software testing cycle, from test
writing and execution to remediation.
● Set up the frontend from close to scratch: project structure, tooling, and
component architecture.
● Built a reusable design system using Shadcn UI and Radix UI based on
Figma designs, with shared components and Storybook documentation.

● Restructured the frontend as a monorepo with 3 apps (main platform, admin
panel, Storybook) and one shared package for components, styles, hooks,
utils, and types.
● Reduced the main JavaScript bundle by about 25% through code splitting with
lazy loading, dropping unused libraries, and tightening exports.
● Worked with product and design in a Scrum team on new features and UX
improvements; also handled performance work, bug fixing, code reviews, and
Jest / React Testing Library tests for key UI.
● Since March 2026, designed and built backend API endpoints with Python
and FastAPI.
● Use Cursor and Claude Code for prototyping and feature work, with normal
code review before changes are merged.
Technologies: React, TypeScript, Python, FastAPI, Docker, TanStack Query, React
Hook Form, Zod, Shadcn UI, Radix UI, Tailwind CSS, Zustand, Storybook, Storyblok

Travelcircus
Frontend Developer
February 2022 - November 2023
Project: Travel booking product covering accommodation, event tickets, and
destination vouchers.
● Built and maintained the frontend of the booking product in React and Next.js.
● Migrated parts of the app to SSR and cut a key page request by about 22%
(from ~230 ms to ~180 ms).
● Ran A/B tests to study user behavior and improve conversion.
● Contributed to the shared design system and published component updates
as an npm package.
● Worked with design and product on new features, with a focus on responsive
behavior, accessibility, and performance.
Technologies: React, Next.js, Redux, JavaScript, Material UI, Emotion, Styled
Systems, Storybook, Git

NFT Marketplace (NDA)
Frontend Developer
March 2021 - December 2021
Project: White-label NFT marketplace that let clients launch their own collections on
the platform.
● Contributed to frontend technology and architecture decisions.
● Built frontend features with React and Redux and worked with the backend
team on API integration.
● Implemented two-factor authentication and MetaMask wallet connection.
Technologies: React, Next.js, Redux Toolkit, TypeScript, Material UI, Emotion, Git

2D/3D Floor Planning Tool (NDA)
Frontend Developer
November 2020 - March 2021

Project: Browser tool for creating detailed floor plans without requiring CAD
experience.
● Built the UI with React and SCSS, including custom reusable components.
● Implemented the interactive planning surface using Canvas.
● Used Redux and Immutable.js for state, and maintained older parts of the
codebase.
Technologies: JavaScript, React, Redux, Immutable.js, SCSS, Canvas, Git

E-Commerce Platform (NDA)
Frontend Developer
March 2019 - July 2020
Project: E-commerce platform for purchasing internet domains and hosting.
● Built new UI features and interactive components with a mobile-first,
responsive approach.
● Worked on an existing React and Redux codebase, including bug fixing and
maintenance.
Technologies: JavaScript, React, Redux, Git

VPN Service (NDA)
QA Specialist
December 2016 - March 2019
Project: VPN product covering web, desktop, and mobile clients.
● Performed full-cycle QA across web, desktop, and mobile, including test
cases, checklists, test plans, and bug reports.
Technologies: Jira, TestRail, WorkBench, Google Dev Console, Postman,
VirtualBox

EDUCATION
National Technical University “Kharkiv Polytechnic Institute”
Master of Computer Science · In progress (started 2026)

NTUU “Kyiv Polytechnic Institute”
Bachelor’s Degree, Management of Organizations · 2006-2010

CERTIFICATIONS
Advanced JavaScript & React Engineering - Beetroot Academy · Verify
Python Development - Beetroot Academy, May 2026 · Verify

LANGUAGES
English: B2 · Ukrainian: Native