Mark Simonovskiy

Background

About Mark Simonovskiy

Senior Frontend Engineer | Fullstack developer | UI & Design Systems | High-Performance Web Apps Experienced Frontend Engineer with a strong focus on building high-performance and user-centric web applications. Passionate about UI/UX, design systems, and crafting seamless digital experiences. Skilled in close collaboration with designers to bridge the gap between design and development, ensuring pixel-perfect execution and outstanding user experience. • 8+ years in web development, specializing in JavaScript, TypeScript, React, and modern UI frameworks. • Proven expertise in developing scalable front-end architectures and improving application performance. • Hands-on experience with UI libraries, component-driven development, and fine-tuning visual details for a polished look and feel. • Strong advocate of design consistency, accessibility, and smooth micro-interactions to enhance user engagement. Design Systems & UI Development • Built and maintained in-house UI libraries, enabling faster development cycles and design consistency across applications. • Collaborated closely with designers to translate Figma prototypes into reusable and high-performance React components. • Focused on accessibility (a11y) and responsive design to ensure optimal usability across devices. Implemented smooth animations and micro-interactions to improve user experience. Key strengths: • Deep understanding of rendering performance in React and strategies to optimize re-renders • Experience with profiling and optimizing UI for speed and responsiveness • Strong ability to iterate on UI/UX improvements directly in code without relying on full design specs. • Proficient in working with component-based architectures and design tokens for scalable UI solutions • Proven technical expertise: JavaScript, Typescript, React, Node, Webpack, HTML, CSS, Sass, PostCSS, Styled Components, and more • Skilled problem solver: Tackles complex challenges with effective solutions • Collaborative team player: Experienced in Agile environments and cross-functional teams Programming Languages & Frameworks • JavaScript / TypeScript • Node.js • React (Redux, React Hooks) • Angular, jQuery • HTML & Styling Libraries (CSS, Sass, PostCSS, Styled Components) • State management: Redux, MobX Build & Tooling • Webpack, Grunt, Gulp • Prettier, ESLint, Husky Backend & Databases • SQL, Knex • Fastify DevOps & Deployment • Docker, Kubernetes • Next.js