Vasyl Hartaver

AI-powered customer engagement platform (employer under NDA). Improved mobile Core Web Vitals from 15 to 90 (LCP cut 6x). Refactored to a layered micro-frontend architecture enabling parallel team development. Introduced unit testing from zero coverage. Built custom Claude Code agents, skills & MCP integrations and a Playwright visual-regression CI/CD pipeline. Stack: Vue.js, TypeScript, React, Micro-frontends, Pinia.

Web application for print inspection systems used by pharma and packaging companies. Led migration from Vue 2 to Vue 3 (Composition API) with Pinia. Integrated Feature-Sliced Design, boosted page load 40% via virtual scrolling for 10k+ rows, optimized GraphQL payloads by 35%, and reached 97% test coverage (Vitest/Jest). Mentored developers on Vue 3 and kept Lighthouse >90. Stack: Vue.js, TypeScript, GraphQL, Pinia, Vitest, SCSS.

Built and shipped client-facing web apps with SSR/SSG using Nuxt.js. Architected the front-end from scratch with Clean Architecture (DDD), Vue 3 and Pinia for a greenfield product. Achieved sub-second initial loads and strong SEO via Nuxt SSR/SSG. Applied Adapter, Command and DI patterns to decouple business logic. Reduced bundle size via lazy loading, tree shaking and code splitting. Integrated Sentry. Stack: Vue.js, Nuxt.js, TypeScript, Node.js, Pinia, Tailwind CSS.

Developed web applications for clients across multiple industries and built a custom CRM system. Refactored a legacy monolithic PHP application into modular Vue 2 micro-services, enabling independent per-feature deployments. Implemented SSR with Nuxt.js for client-facing apps, improving SEO indexing and time-to-interactive. Built a responsive component library for cross-device consistency. Stack: Vue.js, Nuxt.js, React, TypeScript, Node.js, PHP.

Solo front-end developer building web applications end-to-end from Figma designs to production. Established the front-end architecture using Vue.js and delivered 3 client projects from zero to production. Implemented WCAG accessibility standards (WAVE), achieving compliance for all delivered projects. Translated complex animations and UI interactions from Figma into performant, reusable CSS/JS components. Stack: Vue.js, JavaScript, Node.js, CSS, Figma.

Built custom web applications for international clients on Upwork. Delivered 10+ projects across e-commerce, SaaS and marketing verticals using Vue.js and React. Maintained a top-rated freelancer profile with a 100% job success score. Stack: Vue.js, React, Node.js, TypeScript, Tailwind CSS, SCSS.