Andrew Ratnikov
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Senior Frontend Developer | React | Typescript
Ukraine
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Senior Frontend DeveloperForbytesAug 2022 - Jun 2026 (3 years 11 months)-Led greenfield development of a high-traffic rental management platform, owning frontend architecture and scaling the product to thousands of active users.
-Designed and implemented a modular, reusable UI system using Tailwind CSS and shadcn/ui, significantly improving development speed and design consistency.
- Served as technical lead on the frontend, collaborating closely with product and backend teams to translate complex business requirements into scalable, maintainable user interfaces.
- Introduced an end-to-end testing strategy with Cypress, reaching ~80% coverage and reducing production defects by 70%.
- Standardised Cursor AI usage across the team via custom project rules, improving code consistency and reducin- Senior Frontend DeveloperBizzaboFeb 2022 - Jul 2022 (6 months)- Joined the core engineering team as a senior contributor to accelerate delivery of critical event management features under tight deadlines.
- Built reusable, high-performance components for the internal UI library using React and Storybook, improving design consistency and reducing feature development time by ~30%.
- Optimized performance-critical pages through lazy loading, code splitting, and rendering optimizations, leading to measurable improvements in initial load time.
- Strengthened cross-team collaboration by documenting UI components and actively participating in code reviews to maintain high architectural and code quality standards. - UI DeveloperAgileEngineMar 2020 - Jan 2022 (1 year 11 months)- Contributed to the development of an open-source frontend data visualization library used for analytical and healthcare-related use cases.
- Built complex data visualization components using React and D3, focusing on performance, scalability, and usability.
- Integrated the frontend library with JupyterLab, enabling interactive data analysis workflows for end users.
- Developed internal analytics products, collaborating closely with backend and data teams to deliver reliable, data-driven interfaces. - Frontend DeveloperSolveCare FoundationFeb 2019 - Mar 2020 (1 year 2 months)- Developed and maintained frontend components for a healthcare platform connecting patients, providers, and insurance organizations.
- Improved application security by identifying and resolving frontend-related vulnerabilities in collaboration with the backend team.
- Increased code reliability by implementing extensive unit test coverage across most of the application.
- Participated in project estimation, refactoring initiatives, and performance optimization efforts to support long-term maintainability. - Frontend DeveloperGenesis TechNov 2017 - Jan 2019 (1 year 3 months)- Developed responsive frontend components and user-facing features for a consumer web platform.
- Contributed to project estimation and technical planning, ensuring predictable delivery timelines.
- Mentored a junior developer through code reviews and hands-on guidance, improving team productivity and code quality. - AJunior Front-end developerAVRA TechnologyAug 2016 - Nov 2017 (1 year 4 months)- Converted design mockups (PSD) into responsive web pages using HTML, SCSS, and jQuery.
- Assisted backend developers with frontend integration, debugging, and feature implementation.
- Performed ongoing website maintenance, enhancements, and third-party jQuery plugin integration.
Education
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- Full Stack Web Development Certification, Computer Software EngineeringFree Code CampJan 2015 - Current (11 years 10 months)
- Specialist’s degree, ElectronicsNational Technical University of Ukraine Kyiv Polytechnic InstituteJan 2004 - Jan 2010 (6 years 1 month)