Hi, I’m Sergey Romanovsky, a Senior Frontend Engineer with 11+ years of experience building interactive, user-friendly web products using React, TypeScript, and modern JavaScript. I excel at translating scripts, storyboards, and product requirements into polished digital experiences, delivering responsive dashboards, onboarding flows, and accessible interfaces for kids and teens. I enjoy collaborating with product owners, designers, and engineers to create engaging, clear interfaces and robust front-end architectures. I’m comfortable working remotely with subject-matter experts to refine tone, usability, and functionality, including branching learner journeys, progress tracking, and gamified elements. I bring a strong focus on accessibility, cross-device testing, and maintainable code, and I’m experienced with CMS-backed content, internationalization, and performance-minded delivery for education and gamified product experiences.

Sergey Romanovsky

Hi, I’m Sergey Romanovsky, a Senior Frontend Engineer with 11+ years of experience building interactive, user-friendly web products using React, TypeScript, and modern JavaScript. I excel at translating scripts, storyboards, and product requirements into polished digital experiences, delivering responsive dashboards, onboarding flows, and accessible interfaces for kids and teens. I enjoy collaborating with product owners, designers, and engineers to create engaging, clear interfaces and robust front-end architectures. I’m comfortable working remotely with subject-matter experts to refine tone, usability, and functionality, including branching learner journeys, progress tracking, and gamified elements. I bring a strong focus on accessibility, cross-device testing, and maintainable code, and I’m experienced with CMS-backed content, internationalization, and performance-minded delivery for education and gamified product experiences.

Available to hire

Hi, I’m Sergey Romanovsky, a Senior Frontend Engineer with 11+ years of experience building interactive, user-friendly web products using React, TypeScript, and modern JavaScript. I excel at translating scripts, storyboards, and product requirements into polished digital experiences, delivering responsive dashboards, onboarding flows, and accessible interfaces for kids and teens. I enjoy collaborating with product owners, designers, and engineers to create engaging, clear interfaces and robust front-end architectures.

I’m comfortable working remotely with subject-matter experts to refine tone, usability, and functionality, including branching learner journeys, progress tracking, and gamified elements. I bring a strong focus on accessibility, cross-device testing, and maintainable code, and I’m experienced with CMS-backed content, internationalization, and performance-minded delivery for education and gamified product experiences.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
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Language

English
Fluent

Work Experience

Senior React.js Developer / Senior Frontend Engineer at McKinsey
March 1, 2022 - Present
Led and maintained complex React/TypeScript/Next.js frontend for enterprise-grade platforms, translating product requirements into scalable UI components, shared libraries, and polished UI states. Focused on accessibility, onboarding flows, and cross-device usability; implemented testing suites (Vitest, Playwright) and collaborated with PMs, designers, and backend engineers to ensure reliable delivery.
Founder / Full-Stack Frontend Engineer at Lot Calc
January 1, 2026 - April 1, 2026
Owned product end-to-end, including positioning, UX, frontend architecture, onboarding, pricing flows, and dashboard UI. Designed guided onboarding and task-oriented flows to help users understand complex calculations; built with Next.js, TypeScript, Tailwind CSS, and modern React patterns.
Senior React.js Developer at Daria - Nutrition
June 1, 2022 - July 1, 2022
Built a content-driven web platform from scratch with Next.js and Sanity CMS. Implemented structured content delivery, frontend and backend functionality, Vercel deployment, notifications, and internationalization; delivered responsive UI and maintainable implementation.
Senior React.js Developer at Emerge
September 1, 2019 - May 1, 2022
Built scalable React and TypeScript features for complex data-heavy product interfaces; developed reusable components and UI patterns; designed UI interactions and animations to improve feedback and usability; integrated GraphQL workflows and collaborated with backend and QA teams to ensure reliable frontend behavior; strengthened frontend quality through code review and testing.
Middle React.js Developer at Temy.co
July 1, 2017 - September 1, 2019
Led frontend delivery for startup products, turning product and design requirements into maintainable React applications; mentored developers; collaborated with cross-functional stakeholders to clarify scope and align with product goals.
Strong Junior React.js Developer at Form.com
January 1, 2016 - July 1, 2017
Built and maintained React features in an Agile product environment; resolved frontend bugs, improved UI behavior, and contributed to stable product releases.
Junior Frontend Developer at Freelance
July 1, 2015 - January 1, 2016
Delivered responsive landing pages and client-facing web interfaces with HTML, SCSS, and jQuery; managed handoff and deployment for small client projects.

Education

Finance at Military Institute of KNU named Taras Shevchenko
January 1, 2015 - May 19, 2026

Qualifications

Add your qualifications or awards here.

Industry Experience

Software & Internet, Professional Services, Education, Media & Entertainment

Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
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