Vinay Kumar

React.js Developer

Hyderabad, India 3+ yrs exp 91 · Outstanding

About

Frontend Developer with 3 years of production experience building and owning features end-to-end in React.js, JavaScript (ES6+), and TypeScript. Track record of taking work from requirements through release: integrating REST APIs and authentication, improving performance (40% gains via code splitting and memoization), and hardening reliability with error boundaries, retry logic, and test coverage (Jest/RTL). Comfortable in fast-moving, cross-functional teams where priorities shift and ownership matters.

Skills & Expertise (54)

React.js Advanced

8.5/10

Years Exp

Redux Toolkit Advanced

8.0/10

Years Exp

React Router Advanced

8.0/10

Years Exp

TanStack Query Advanced

8.0/10

Years Exp

JavaScript Advanced

8.0/10

Years Exp

Git Advanced

8.0/10

Years Exp

GitHub Advanced

8.0/10

Years Exp

Context API Advanced

8.0/10

Years Exp

Hooks Advanced

8.0/10

Years Exp

CSS3 Advanced

8.0/10

Years Exp

HTML5 Advanced

8.0/10

Years Exp

Next.js Intermediate

7.5/10

Years Exp

Tailwind CSS Intermediate

7.5/10

Years Exp

MUI Intermediate

7.5/10

Years Exp

REST Intermediate

7.0/10

Years Exp

Scrum Intermediate

7.0/10

Years Exp

SCSS Intermediate

7.0/10

Years Exp

Agile Intermediate

7.0/10

Years Exp

RESTful APIs Intermediate

7.0/10

Years Exp

GraphQL APIs Intermediate

7.0/10

Years Exp

SASS Intermediate

7.0/10

Years Exp

Typescript Intermediate

7.0/10

Years Exp

GraphQL Intermediate

7.0/10

Years Exp

WebSockets Intermediate

7.0/10

Years Exp

React Testing Library Intermediate

7.0/10

Years Exp

JWT Intermediate

7.0/10

Years Exp

REST APIs Advanced

7.0/10

Years Exp

SQL Intermediate

7.0/10

Years Exp

Axios Intermediate

7.0/10

Years Exp

Vitest Intermediate

6.5/10

Years Exp

Vite Intermediate

6.5/10

Years Exp

Webpack Intermediate

6.5/10

Years Exp

bootstrap Intermediate

6.5/10

Years Exp

Python FastAPI Intermediate

6.5/10

Years Exp

Docker Intermediate

6.5/10

Years Exp

ESLint Intermediate

6.0/10

Years Exp

Babel Intermediate

6.0/10

Years Exp

Web Accessibility Intermediate

6.0/10

Years Exp

OAuth2 React Testing Library (RTL Zustand DOM APIs Javascript (ES6+ Codex Claude Code WebRTC Material-UI (MUI Postgresql LangGraph LangChain Code Review Figma RTL Jest

Work Experience

Frontend Developer

RandomTrees

Sep 2023 - Present

Owned reusable React.js component libraries, built and shipped end-to-end, cutting code duplication by 35% across enterprise applications. Improved application performance by 40% via code splitting, lazy loading, memoization, and bundle optimization. Integrated REST APIs and authentication workflows (JWT, RBAC) into production apps, coordinating with Python FastAPI, SQL, and PostgreSQL backends. Improved reliability with retry logic, error boundaries, and structured edge-case handling.