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r mnsk

@rmnsk

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Senior Frontend Engineer at McKinsey; built SwapX, a Uniswap V3 swap interface on Ethereum.

Thailand

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At McKinsey, I architect and maintain a Next.js frontend, improving performance by 50%. I also built a reusable design-system component library with design tokens and WCAG AA accessibility checks.

I built and launched LotCalc, a MetaTrader lot-size and risk-calculation SaaS, using Next.js, TypeScript, and Tailwind CSS. I worked across its UX, frontend architecture, dashboards, pricing, and onboarding.

At Emerge, I improved application performance by 20% through code splitting and virtualization, and built reusable React components shared across teams. I also wrote server-side GraphQL code and implemented tests that reduced QA workload by 35%.

I built SwapX, a Next.js Uniswap V3 swap interface on Ethereum mainnet, with browser-wallet connection and swap execution. Its transaction experience covers pending, confirmed, and failed states, while explaining approvals, gas costs, and errors.

Experience

Work history, roles, and key accomplishments

Current

Senior React.js Developer

Current

McKinsey

Mar 2022 - Present (4 years 8 months)

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.js TypeScript React Design Systems Design Tokens WCAG 2.1 AA Vitest Playwright CI CD Performance Optimization Lighthouse LCP CLS TBT Lazy Loading Caching RFC Technical Documentation

Founder / Full-Stack Frontend Engineer

LotCalc

Jan 2026 - Apr 2026 (3 months)

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.js TypeScript Tailwind Product Management UX Frontend Architecture Cursor Claude ChatGpt

Senior React.js Developer

Daria-Nutrition

Jun 2022 - Jul 2022 (1 month)

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.js Sanity Telegram API i18n Vercel

Senior React.js Developer

Emerge

Sep 2019 - May 2022 (2 years 8 months)

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.

React Code Splitting Virtualization GraphQL Unit Testing Integration Testing Code Review UI Animation

Middle React.js Developer

Temy.co

Jul 2017 - Sep 2019 (2 years 2 months)

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

React Team Leadership Mentorship Frontend Architecture