r mnsk

Senior React.js Developer

McKinsey

Architected and maintained a Next.js frontend with Server Components, improving performance by 50%. Built a reusable design-system component library with design tokens and WCAG AA accessibility checks.

Next.jsTypeScriptReactDesign SystemsDesign TokensWCAG 2.1 AAVitestPlaywrightCI CDPerformance OptimizationLighthouseLCPCLSTBTLazy LoadingCachingRFCTechnical Documentation

Founder / Full-Stack Frontend Engineer

Built and launched a MetaTrader lot-size and risk-calculation SaaS using Next.js, TypeScript, and Tailwind CSS. Owned product positioning, UX, frontend architecture, and responsive landing pages.

Next.jsTypeScriptTailwindProduct ManagementUXFrontend ArchitectureCursorClaudeChatGpt

Senior React.js Developer

Built a blog from scratch, including frontend and backend components, with Next.js and Sanity.io CMS. Integrated Telegram notifications, implemented internationalization (i18n), and deployed with Vercel.

Next.jsSanityTelegram APIi18nVercel

Senior React.js Developer

Improved application performance by 20% through code splitting and virtualization. Built and maintained reusable React components shared across teams and wrote server-side GraphQL code.

ReactCode SplittingVirtualizationGraphQLUnit TestingIntegration TestingCode ReviewUI Animation

Middle React.js Developer

Provided team leadership for 3 frontend developers and mentored junior developers. Architected and implemented frontend solutions for two startups that were subsequently acquired.

ReactTeam LeadershipMentorshipFrontend Architecture

Strong Junior React.js Developer

Identified and fixed bugs to improve website performance, while developing React, algorithm, and data-structure skills.

ReactAlgorithmsData StructuresBug fixingPerformance

Junior Front-end Developer

Built and deployed 5 client landing pages using HTML, SCSS, and jQuery.

HTMLSCSSjQuery