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Senior Frontend Engineer (ReactJS)
Senior Frontend Engineer (ReactJS)Zyoin Group • Thane, IN
Senior Frontend Engineer (ReactJS)

Senior Frontend Engineer (ReactJS)

Zyoin Group • Thane, IN
1 hour ago
Job description

Must have tech stack

Typescript + ReactJS 5+ years of experience is must to have

HTML

designing system

development with Architect Experience must

Responsibilities :

  • Design and develop a high performance SaaS B2B application
  • Deliver products with high responsibility, availability, scalability, security, and maintainability
  • Work with a product owner, a designer, and backend engineers to implement product features
  • Translate UI / UX designs and business requirements into high-quality, well-tested, clean, simple, and maintainable code
  • Take a lead on technical best practices
  • Resolve any technical issues, risks, and challenges, escalating as necessary and providing solutions
  • Maintain and improve product quality.

Requirements

Must have

  • 8+ years experience in web development
  • 5+ years for frontend development for React / Typescript
  • Experience with Agile development.
  • Strong understanding of JavaScript fundamentals
  • Strong knowledge of HTML and CSS
  • Experience with frontend testing frameworks (Jest, Mocha, etc…)
  • Experience using, designing, and building GraphQL Web Service APIs
  • Experience in designing system architecture
  • Experience in designing and maintaining UI components (Stotrybook, Visual Regression Test, etc…)
  • Excellent English verbal communication skills.

    • Nice to have

  • 1+ years experience with backend development (Golang / Java / NodeJS / Others)
  • Experience with CI / CD (Github workflow, Circle CI) and infrastructure (AWS, Heroku)
  • Container-based development (Docker, docker-compose, Kubernetes) experience
  • Experience with scrum master role.
  • Experience utilizing design systems.
  • Experience in utilizing state management libraries (Redux etc..)
  • Understanding of microfrontend architecture

    • Core Frontend Development (must-have)

  • React.js (hooks, concurrent features, Suspense, SSR / CSR tradeoffs).
  • TypeScript — advanced typing, generics, utility types, codebase-wide typing strategy.
  • Modern JavaScript (ES6+) — modules, async / await, iterators, proxies, memory / closure patterns.
  • HTML5 / CSS3 — semantic markup, responsive layouts, cross-browser quirks, CSS modules / CSS-in-JS (emotion / styled-components) / utility-first (Tailwind).
  • Layout & accessibility — ARIA, WCAG best practices, keyboard navigation, screen-reader testing.
  • Performance optimization — code-splitting, lazy loading, critical CSS, HTTP caching, image optimization, bundle analysis.
  • Client-side rendering patterns — CSR, SSR, ISR, hydration concerns (Next.js / Nuxt-like knowledge).

    • Component & Design System Engineering (must-have)

  • Component-driven design — Atomic / Feature-sliced architecture, reusable component libraries.
  • Storybook (authoring, docs, visual review), component catalog maintenance, semantic versioning for component libs.
  • Design tokens & theming — token management, runtime theming, dark mode, cross-brand theming.
  • Visual regression — Percy / Chromatic or similar visual diff workflows integrated into CI. (nice to have)

    • State Management & Data Layer (must-have)

  • State libraries — Redux (toolkit), Zustand, Recoil, or comparable patterns; advanced patterns (selectors, middleware, immutability).
  • Offline & real-time — WebSockets, Server-Sent Events, optimistic updates, cache invalidation patterns. (nice to have)
  • GraphQL & REST — designing / consuming GraphQL APIs (Apollo / Relay), schema awareness, batching / fetch policies.

    • Architecture & System Design (must-have)

  • Micro-frontend architecture — module federation, routing & shared runtime, version management, independent deployability.
  • Monorepo experience — Nx / Lerna / Turborepo setups, package boundaries, dependency graph management.
  • Scalability & maintainability — feature-slicing, separation of concerns, large-scale codebase refactoring.
  • Security-first frontend — XSS / CSRF mitigations, secure auth flows, token handling in browser, secure storage patterns.

    • Testing & Quality (must-have)

  • Unit & integration testing — Jest, React Testing Library, mocking patterns, coverage strategies.
  • E2E testing — Cypress or Playwright with stable selectors, parallel test strategy, test flakiness mitigation.
  • Contract & integration testing — schema validations for GraphQL / REST; consumer-driven contracts.
  • Static analysis & linting — ESLint, TypeScript compiler settings, style enforcement (Prettier), automated PR checks.
  • Observability & error monitoring — Sentry, LogRocket, frontend telemetry, performance monitoring (Core Web Vitals).

    • Build, CI / CD & Platform (must-have)

  • Build tooling — Webpack 5, Vite, Rollup; tree-shaking and long-term caching strategies.
  • CI / CD pipelines — GitHub Actions / CircleCI / Jenkins : test → build → visual tests → canary / blue-green deploy.
  • Containerization & infra — Docker, container-based local dev, K8s familiarity for frontends (Ingress, rolling deploys).
  • Package management & publishing — npm / pnpm / yarn workspaces, private registries, semantic releases.
  • Cloud platforms — AWS / GCP / Azure basics for frontend delivery (CDN, S3, CloudFront, IAM). (nice to have)

    • Observability, Ops & Reliability (must-have)

  • Performance budgets & SLOs for frontend features; monitoring Core Web Vitals.
  • Feature flags & rollout — LaunchDarkly / Unleash or self-hosted flag strategies for safe releases.
  • Incident response — debug production issues, rollbacks, root-cause analysis for client-side faults.

    • Backend & Integration

  • Understanding backend systems — service contracts, authentication (OAuth2 / OpenID Connect), rate limits, idempotency. (must have)
  • Some backend exposure — NodeJS / Java / Go basics for cross-stack debugging and building small services (nice-to-have).
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    Senior Frontend Engineer • Thane, IN

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