Arin Mandal
Frontend Developer
4+ years exp
JavaScript
TypeScript
Node JS
C++
Python
C
Active 2 days ago
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Overview
Technical skills
Projects
Timeline
Roles
Overview
Frontend Engineer focusing on React SPAs and component-driven UI at a Middle level, with strongest practical experience building interactive single-page applications. The most proven skill is implementing SPA patterns and data-driven UI with routing, lazy-loading and Redux integration as shown in App.js and Body.js. There is limited evidence of advanced performance measurement, formal accessibility audits, backend system design beyond small Express examples, or production-grade scalability patterns.
Phone
Technical skills
Languages
6
JavaScript
TypeScript
Node JS
C++
Python
C
Frontend
6
React.js
Tailwind CSS
Parcel
Redux Toolkit
React Router
Redux
Other
23
Rest API
Express
Axios
Supabase
LLM
Jest
PostgreSQL
Gemini
Firebase
GitHub
Framer Motion
GSAP
Vite
Netlify
Hugging Face
Ollama
Git
Vercel
Postman
Framer
PostCSS
State Management
CSS Modules
Projects
- Developed a responsive job portal using React and Tailwind CSS, implementing job listing, search, and application workflows.
- Integrated Clerk authentication and Supabase for user authentication, session management, and relational data operations
- Built reusable React components and optimized component rendering and state updates to improve application responsiveness.
Timeline
Frontend Developer Trainee
•
Junior
EJOBINDIA
•
Full-Time
Built responsive job-portal web features such as job listings, search, and application workflows using React and Tailwind CSS. Implemented user authentication and session handling with Supabase, including relational data operations. Worked on UI responsiveness and interactive user flows for the platform.
React.js
Tailwind CSS
Supabase
Web Development Intern
•
Junior
Unified Mentor
•
Internship
Developed a food-delivery web application using React with a modular component approach. Integrated the Swiggy API to fetch restaurant and menu data and implemented dynamic filtering and data-driven rendering. Packaged the frontend using Parcel for development and deployment.
React.js
Parcel
Rest API
Middle Backend Developer
Confidence: Medium API Engineer
Full‑stack web engineer focused on React front-end work with supplementary Node/Express API examples, at a middle (early-mid) level with strong front-end integration skills. The strongest proven skill is building modular React applications with routing, lazy loading, context and Redux integration, demonstrated in App.js and Body.js and exercised by jest tests (Search.test.js). There is little evidence of production backend concerns such as persistent databases, schema migrations, authentication flows, or operational resilience in public code.
API Design
2/10
How well APIs are designed
Basic REST usage and a tiny Express API exist but no versioning, pagination, idempotency, or formal error-contracts are implemented.
Evidence
Namaste-React/src/Components/Body.js: fetch(RESTAURANT) and setRestaurantList usage
React-Mastery-Hub/HandleAPI/backend/server.js: GET /api/products with search query param
React-Mastery-Hub/HandleAPI/frontend/vite.config.js: dev proxy '/api' -> 'http://localhost:3000'
Data Layer & Database
1/10
Working with databases
No database or migrations; data is in-memory or static mock files only.
Evidence
Namaste-React/src/Utils/mockData.js: large static restaurantList array
React-Mastery-Hub/HandleAPI/backend/server.js: in-memory products array returned by /api/products
Scalability & Performance
2/10
Handling load and speed
Some front-end performance patterns (lazy loading, suspense, shimmer) are used; no backend caching, queues, or connection pooling are present.
Evidence
Namaste-React/App.js: React.lazy + Suspense for Grocery lazy loading
Namaste-React/src/Components/Body.js: ShimmerUI used while data loads
React-Mastery-Hub/HandleAPI/backend/server.js: setTimeout used to simulate delayed response (no caching)
System Architecture
3/10
Overall system structure
Reasonable component and module boundaries for a front-end app with Router/Provider and Redux integration; system decomposition is front-end centric with a small example API.
Evidence
Namaste-React/App.js: RouterProvider routes and Provider (redux) wrapping App
Namaste-React/src/Components/Body.js: component decomposition and HOC withPromotedLabel usage
Namaste-React/src/ReduxStore/appStore.js: import and use of CartReducer (module separation)
Security & Auth
1/10
Protecting data and access
Minimal security practices; no authentication flows, token lifecycle, input validation, or secrets handling are implemented in back-end code.
Evidence
Namaste-React/App.js: placeholder useEffect labeled 'authentication logic' but no auth implementation
React-Mastery-Hub/HandleAPI/backend/server.js: accepts query params and returns data with no validation or sanitization
Reliability & Observability
3/10
Stability and monitoring
Basic test infra and unit tests for front-end components exist, but production-grade reliability patterns (timeouts, retries, graceful shutdown, structured logging, metrics) are missing.
Evidence
Namaste-React/jest.config.js: non-trivial Jest configuration
Namaste-React/src/__test__/Search.test.js: integration-style tests exercising fetch and UI behavior
React-Mastery-Hub/HandleAPI/backend/server.js: console.log server start (no graceful shutdown)
Expertise
Node.js• Junior
Industries
Education• Middle
Technologies
Node JS• Middle
Rest API• since 2024
Express
Axios
Core• mentioned only
Recommendations
- Develop small REST services with Express connected to a real database and a migration history to show schema evolution (e.g., Express + PostgreSQL + migration scripts).
- Implement authentication and input validation (JWT/session lifecycle, refresh/revocation, Helmet/express-validator) and add integration tests for auth flows.
- Add basic operational concerns to backend services: graceful shutdown, request timeouts, retries with backoff for outbound calls, and simple structured logging/metrics.
- Extend test coverage to include backend integration tests and add CI configuration to run tests and linting automatically.
Repositories
The developer's experience in this domain has been verified based on AI analysis of the following repositories:
Middle Frontend Developer
Confidence: Medium App Engineer
Frontend Engineer focusing on React SPAs and component-driven UI at a Middle level, with strongest practical experience building interactive single-page applications. The most proven skill is implementing SPA patterns and data-driven UI with routing, lazy-loading and Redux integration as shown in App.js and Body.js. There is limited evidence of advanced performance measurement, formal accessibility audits, backend system design beyond small Express examples, or production-grade scalability patterns.
UI Component Architecture
4/10
How interface parts are built
Component composition is deliberate (HOC usage and composition), with lazy-loaded chunks and context/Provider boundaries; evidence of a designed component structure exists but many components look like tutorial or exercise code rather than a production component library.
Evidence
Namaste-React/src/Components/Body.js: uses withPromotedLabel HOC and composes RestaurantCard instances
Namaste-React/App.js: composes Header/Footer, RouterProvider, React-Redux Provider and UserContext for app-level boundaries
Namaste-React/src/Components/UserClass.js: class-based component implementation alongside functional patterns
Responsive & Cross-browser
4/10
Works on all screens and browsers
Responsive and cross-browser concerns are present via explicit media queries, prefers-color-scheme rules, and Tailwind configuration; work shows attention to theming and fluid breakpoints but not advanced container queries or RTL evidence.
Evidence
React-Mastery-Hub/react-typescript/src/index.css: media queries and prefers-color-scheme rules
React-Mastery-Hub/react-typescript/src/App.css: responsive rules and focus-visible handling
Namaste-React/tailwind.config.js: Tailwind content configuration and background image tokens
Performance Optimization
3/10
Speed of the interface
Basic performance practices are applied: code-splitting via lazy/Suspense and skeleton (Shimmer) UIs for perceived performance; no measured before/after metrics, advanced bundle analysis artifacts, virtualization, or explicit memoization patterns were found.
Evidence
Namaste-React/App.js: lazy(() => import(...)) with Suspense fallback for Grocery
Namaste-React/src/Components/Body.js: ShimmerUI used as loading placeholder
Namaste-React/package.json: Parcel-based build script (code-splitting entry point present)
Accessibility & Semantics
3/10
Usable for everyone
Some accessibility hygiene is present (use of semantic buttons, getByRole in tests, focus-visible styles and color-scheme handling) but there is no evidence of ARIA on custom widgets, focus management for complex interactions, or CI a11y checks.
Evidence
React-Mastery-Hub/react-typescript/src/App.css: focus-visible and focus styles
Namaste-React/src/__test__/Search.test.js: tests use getByRole to assert UI interactions
React-Mastery-Hub/MiniContext1/src/index.css: prefers-color-scheme handling
State Management & Data Flow
3/10
Managing data in the app
Server-state and data flow are handled with conventional patterns: fetch + local state, a Redux store Provider and a custom online-status hook; however advanced patterns (request cancellation, optimistic updates with rollback, cache invalidation, or state machines) are not evidenced.
Evidence
Namaste-React/App.js: wraps app with React-Redux Provider using appStore
Namaste-React/src/Components/Body.js: fetchData uses fetch and sets component state; filtering/search flow implemented
Namaste-React/src/__test__/Search.test.js: global.fetch is mocked to exercise data-driven behavior
UX & Visual Polish
4/10
Look and feel quality
UX attention is visible: loading skeletons, offline state messaging, search and filter interactions, and a Suspense fallback improve perceived performance and polish; much of this is exercise-driven but implemented end-to-end with tests.
Evidence
Namaste-React/src/Components/Body.js: search/filter UI, offline render, and use of ShimmerUI
Namaste-React/App.js: Suspense fallback for lazy-loaded Grocery component
Namaste-React/src/Utils/mockData.js: comprehensive mock dataset used for UI and tests
Verified artifacts
Expertise
React• Middle
Frontend Architecture & Build Tools• Middle
HTML & CSS• Middle
Technologies
Redux
GSAP
Tailwind CSS• since 2025
Vercel
Netlify
Git
React.js• since 2024
Framer
Vite
PostCSS
CSS Modules
Framer Motion
Parcel• since 2024
Redux Toolkit
React Router
GitHub
GitHub• mentioned only
JavaScript• mentioned only
Redux• mentioned only
State• mentioned only
Recommendations
- Develop interactive SPA features and client-side flows such as authenticated routes, complex forms and data caching using React + Redux Toolkit and React Router.
- Build and maintain component libraries and design-system work where component boundaries, tokens and accessibility attributes are enforced and documented.
- Own build-tool improvements and performance work: add bundle analysis, measurable LCP/INP CI checks, and implement request cancellation or optimistic update patterns for server-state flows.
Repositories
The developer's experience in this domain has been verified based on AI analysis of the following repositories:
Middle QA Engineer
Confidence: Medium Automation Engineer
React front-end engineer at a middle level with a practical focus on component testing and production-aware build tooling. The strongest proven skill is component-level test automation using Jest and React Testing Library as shown by the concrete Search.test.js behavior tests that mock fetch and assert filtered results. There is limited evidence of CI-integrated test orchestration, contract testing, E2E pipelines, or performance/load testing in public code.
Test Automation Frameworks
3/10
Building automated tests
Basic test automation with Jest and React Testing Library is present (component tests, mocked network); however there is no dedicated fixture/factory layer, mock server with logic, or CI parallelization evident.
Evidence
Namaste-React/src/__test__/Search.test.js
Namaste-React/jest.config.js
Namaste-React/package.json
Test Coverage & Strategy
2/10
What and how to test
Tests exercise UI component behavior and selector discipline (data-testid) and assert concrete outcomes, but coverage is focused on happy/filtered-path counts rather than risk-based negative-paths, property tests, or mutation testing.
Evidence
Namaste-React/src/__test__/Search.test.js
API & Integration Testing
3/10
Testing how parts work together
There is a simple mock API server and a dev proxy, enabling local integration testing; however contract/schema validation and explicit error-path or retry/idempotency tests are not present.
Evidence
React-Mastery-Hub/HandleAPI/backend/server.js
React-Mastery-Hub/HandleAPI/frontend/vite.config.js
Performance & Load Testing
Testing speed under load
Not evidenced in public code
Bug Reporting & Analysis
1/10
Finding and describing bugs
Some build-time audit and logging used for quality checks (contrast audit) but there are no reproducible bug reports, root-cause analyses, or flaky-test investigations linking fixes to issues.
Evidence
Eclipse-Wave/src/build.ts
CI Test Integration
1/10
Running tests automatically
Basic npm scripts and test commands exist but there is no CI workflow, per-test retry policy, quarantine mechanics, or artifact collection configuration visible.
Evidence
Namaste-React/package.json
Namaste-React/jest.config.js
Expertise
Unit & Component Testing• Middle
API Testing & Contract Validation• Junior
Industries
Software• Middle
Technologies
JavaScript• since 2022 • Middle
TypeScript• since 2025 • Middle
Postman
Jest
Recommendations
- Expand test infrastructure by adding isolated fixtures/factories and a small mock API server with programmable responses to cover negative and edge cases.
- Add CI workflows (GitHub Actions or equivalent) that run unit tests, collect coverage, and upload failure artifacts (screenshots/traces) with per-test retry rules rather than global retries.
- Introduce contract/schema validation for API responses (e.g., JSON Schema / schemathesis or Pact) and add explicit tests for error codes (4xx/5xx/timeouts) and idempotency.
- Build a small E2E suite (Playwright or Cypress) for critical user journeys and a simple performance smoke test for key endpoints using k6 or similar.
Repositories
The developer's experience in this domain has been verified based on AI analysis of the following repositories: