Yaroslav Buhaievskiy

• Integrated generative AI / LLM APIs for CV intake: structured extraction, smart profile prefills, and guardrails on edited content before publish.
• Delivered multi-step forms (Zod, React Query, Zustand), comprehensive localization across the application, and dynamic PDF output for candidate summaries.
• Established a robust CI/CD pipeline utilizing Docker and GitHub Actions, accelerating deployment cycles by 34% and ensuring consistent and reliable releases.
• Established a robust testing framework with Jest and React Testing Library, reducing production bugs and increasing overall code quality.

Technologies: Next.js, TypeScript, Tailwind CSS, React Query, Zustand, shadcn/ui, framer-motion, React Hook Form, Zod Schema Validation, i18n (localization), React-PDF, Playwright, REST APIs, Generative AI / LLM APIs.

• Led migrations from legacy stacks to modern app architectures, shipping responsive, animation-heavy UIs. Post-launch: ~34% more sessions, ~26% higher pages per session, ~21% longer engagement, and ~23% more completed form submissions on lead and contact flows.
• Built an internal component library of 50+ reusable UI components, documented and reused across a family of related sites for consistent UX and faster delivery.
• Drove web performance work across projects: scores in the 95–100 range, ~40% faster initial load, ~30% smaller bundles via image optimization, lazy loading, code splitting, and rendering strategy.
• Analyzed user reports to identify critical bugs and fixed them, increasing the crash-free user rate from 91% to 99%.

Technologies: Next.js, Gulp.js, Styled Components, Tailwind CSS, GSAP, framer-motion, React Query, Zustand, Prime React, Lit.js, Twig, SASS, Storybook, NX (Monorepo), Web Performance Optimization, Google Sheets API, React Hook Form, Lighthouse CI, Cloudinary, HubSpot Forms, Google Analytics, Figma.

• Developed responsive UI components and managed complex application state using React, Redux Toolkit, and Tailwind CSS.
• Implemented RESTful API endpoints and backend business logic using Fastify and Nest.js to support frontend requirements.
• Worked with PostgreSQL and MongoDB, utilizing ORMs like TypeORM and Knex/Objection to interact with databases and execute queries.
• Collaborated with the team to integrate third-party APIs, including Stripe for payment processing and OpenAI services.
• Participated in the full feature lifecycle, delivering end-to-end updates across both the frontend and backend codebase.

Technologies: TypeScript, Redux Toolkit, React, Fastify, Nest.js, Knex, Objection, TypeORM, PostgreSQL, MongoDB, MySQL, AWS, Stripe, OpenAI API, GraphQL, Tailwind.