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Dmitrii Lemin — Senior Frontend Engineer

📫 leminds@gmail.com

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Senior Frontend Engineer with 10+ years across fintech, crypto trading, and enterprise — including team lead experience and multiple 0→1 product builds.

I specialize in React, Next.js, and TypeScript, with focus on scalable frontend architecture, user-critical flows (authentication, KYC, onboarding, account management), and performance-conscious delivery. Comfortable across the stack: Node.js, REST/GraphQL, data-layer design, and mobile (React Native).


Current Focus

  • Production-grade frontend architecture (Feature-Sliced Design, App Router, SSR)
  • Security-critical user flows — auth, KYC, 2FA, API key management
  • Scalable state and data-layer design with TanStack Query
  • Testing strategy and regression safety across critical flows
  • Cross-functional delivery in fintech and trading domains

Tech Stack

Frontend
React · Next.js · TypeScript · JavaScript · GraphQL · Tailwind · CSS Modules · styled-components · Zod

State & Data
TanStack Query · Redux Toolkit · MobX · Jotai · Recoil

Backend & APIs
Node.js · NestJS · Express · PostgreSQL · MongoDB · REST APIs

Testing
Jest · Testing Library · Vitest · Cypress

Architecture
Feature-Sliced Design (FSD) · Component-driven architecture · SSR / App Router · performance optimization · accessibility (a11y)

Tools
Vite · Webpack · Docker · OpenShift · GitOps · CI/CD · Agile/Scrum

Mobile
React Native · Cordova


What I Care About

  • Clean architecture that stays healthy as products scale
  • Business-impactful frontend work — conversion, reliability, performance
  • Honest engineering: maintainable code over impressive-looking complexity
  • Reliable testing as a first-class practice, not an afterthought
  • Cross-functional collaboration with backend, product, and design

Code Sample

🔗 Bingo — test assignment
Recent technical assignment — good signal for code style and engineering approach.


Some technical notes and articles:
🔗 Articles

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