Юрій

YURII KACHAN
Full-Stack Developer | AI Engineer | Product Designer
Kyiv, Ukraine · Remote [відкрити контакти](див. вище в блоці «контактна інформація») [відкрити контакти](див. вище в блоці «контактна інформація») [відкрити контакти](див. вище в блоці «контактна інформація») t.me/yuriikachan_dev

S U M M A RY
Full-stack developer and product designer with 6+ years of commercial experience. I build websites, SaaS platforms,
browser extensions and mobile apps - from design to launch. My current focus is AI: agents, LLM APIs, MCP and voice
AI. Currently building Blip, an iOS app with a real-time voice AI tutor.

EXPERIENCE
Frontend Developer | Nject (nject.ai) Aug 2025 - Present · Remote, Full-time
A browser extension and web platform that add extra AI tools to popular chat services.
Built a Chrome extension from scratch that integrates with 7 AI chats, including ChatGPT, Claude and Gemini.
Own the architecture, development and maintenance of the extension frontend and the React dashboard.
Implemented interaction with the dynamic, frequently changing interfaces of third-party AI platforms.
Set up automated testing against the live web interfaces of AI services, with alerts when a platform update breaks
the extension.
Published in the Chrome Web Store with paying users.
Tech: React, TypeScript, Chrome Extensions (MV3), Playwright, REST API
Full-Stack Developer & Product Designer | Freelance / Contract 2019 - 2026 · Remote, international clients
Design and development of websites and web products for clients in the US, UK and Europe.
Built websites and web apps from scratch on Webflow, WordPress, HubSpot, React and Next.js.
Developed custom components and integrations; optimized load speed, responsiveness and SEO.
Communicated directly with clients, planned and delivered technical tasks.
KEY PROJECTS:
SimplyNode (simplynode.io)
Designed a new site and fully migrated it from Webflow to Next.js and Storyblok.
Moved about 700 pages with SEO preserved.
Automated the content migration via the Storyblok API.
Raised the mobile Google PageSpeed score from 37 to 91-95.
Built a component architecture for further platform growth.
Natural Links (naturallinks.net)
Designed the new look and interface of a SaaS marketplace.
Built the user account area, a role-based admin panel and integrations with three payment providers.
Separately built the marketing site on WordPress with custom Elementor components.
Tech: Next.js, PostgreSQL, Prisma, AWS Cognito, WordPress

Frontend Developer | SOAX (soax.com) Nov 2023 - Jun 2025 · Remote, UK, Full-time
Frontend development and growth of the corporate web platform of an international tech company.
Sole frontend developer of the main SOAX website.
Built and maintained the site on HubSpot CMS, then led the move to Next.js 15 and Storyblok.
Created a reusable component library based on Atomic Design.
Built interactive web tools: IP Checker, Proxy Checker, Browser Fingerprint Checker and cURL Converter.
Handled large content volumes, SEO pages, integrations and performance optimization.
Used Storybook and Jest to document and test components.
Tech: Next.js, React, TypeScript, Storyblok, HubSpot CMS, Storybook, Jest
Frontend Developer | Ninjable, Amsterdam Apr 2023 - Oct 2024 · Remote, Part-time
Developed the frontend of a gamification platform with React and Vite.
Turned Figma designs into interactive interfaces.
Built the company website on HubSpot CMS.
Worked on responsiveness, component structure and UI usability.

O W N P R OJ E CTS
Blip | AI voice tutor for learning English (iOS) Oct 2026 - Present · In development
Designed the app and built the entire frontend myself.
Developing an iOS app for practicing spoken English in live voice calls with an AI tutor.
Real-time voice pipeline: LiveKit (WebRTC), a Python agent, Deepgram speech-to-text and text-to-speech.
Claude Haiku runs the tutoring (corrections, memory, A1-B1 curriculum), Claude Opus grades the exams.
Tech: React Native, Expo, TypeScript, Python, LiveKit, Claude API, Deepgram, Supabase, Railway

T E C H N I C A L S K I L LS
Frontend & Mobile Backend & Integrations
React, Next.js, TypeScript, JavaScript Node.js, PostgreSQL, Prisma
Vite, Tailwind CSS, SCSS, shadcn/ui REST APIs, third-party service integrations
Responsive layouts, interactive UIs, Stripe, AWS Cognito
performance optimization Web application architecture
React Native, Expo Python, Supabase
Chrome Extensions (MV3)
AI Engineering & Automation CMS & Website Development
Claude Code, AI coding agents, MCP Storyblok, Webflow, WordPress, HubSpot CMS
Claude API, LLM integrations Headless CMS, site migrations, SEO
Agentic workflows and automations Custom components and integrations
Voice AI: LiveKit, Deepgram
Testing & DevOps Product Design
Jest, Playwright, Storybook Figma, UI/UX Design
GitHub Actions, GitLab CI Design Systems, Atomic Design
Automated testing, CI/CD Interface and user flow design