Serhii L.

💙 Expert-Vetted Agency member with 100% delivery rate and 150+ projects completed. ⚡ With over 9 years of experience as a front-end and full-stack developer, I focus on building clean, maintainable SaaS and Websites and shipping reliable, high-quality codebase. Most of my work is with React (React.js, ReactJS), where I build dynamic, SEO-friendly SPAs and PWAs using reusable components. I use Next (Next.js, NextJS) for apps that benefit from strong performance. 🔹 I deliver digital solutions across a range of sectors: - SAAS Platforms & AI Startups - AI chatbots, Agents and AI-powered projects - Real-Estate, Booking Apps, Property Marketplaces - Healthcare platforms - Manufacturing - Social Media, Dating Apps - Education & EdTech - Custom CRM, ERP systems 🔹 My tech stack: ・Frontend Development: React, Next.js, Redux, GraphQL, Astro. ・Styled Components, TailwindCSS, Tailwind CSS, tailwind ・Integrations: Twilio, Open AI, API Integration, Custom API Development, SendGrid ・Markup: Responsive, HTML, CSS, HTML5, CSS3, SCSS, Sass, Figma to HTML ・UI Libraries: shadcn (Shadcn UI), Chakra UI, Material UI, Ant Design, MUI ・CMS: Wordpress, WooCommerce, Shopify, Magento, Webflow, Framer, Strapi, Sanity, Contentful. ・JavaScript (ES6–ES8), TypeScript. ・State Management: Redux, Redux-Saga, Zustand, RTK Query. ・Backend & Full Stack: Node.js, Express, NestJS ・Database Management: MongoDB, PostgreSQL, MySQL, Firebase. ・CSS & Design Systems: Scss, Sass, PostCSS, HTML5, CSS3, Tailwind CSS. ・Automation QA: Cypress, Playwright, Puppeteer, Jest, Selenium. ・Tooling: Webpack, Vite, Git, NPM, PNPM, Docker, CI/CD (GitHub Actions, GitLab CI). ・CRM: Hubspot, Saleforce, Pipedrive, Zoho ・Cloud platforms: AWS, Azure, Firebase Hosting, Vercel, Netlify, DigitalOcean, Heroku. ・AI & LLM: ChatGPT, Llama, Gemini ✦︎ My other services also include Front End Development, Back End Development, User Interface, UI/UX Design, Design Services, Mobile development, Website design and App and SaaS development.