vishal kumar

Backend-Focused Full Stack Engineer

2+ yrs exp 86 · Excellent

About

Backend-focused Full Stack Engineer experienced in building scalable SaaS platforms, multi-tenant architectures, and real-time distributed systems using NestJS, Node.js, PostgreSQL, Redis, and WebSockets. Expertise in REST API design, JWT/RBAC authentication, caching strategies, database optimization, and system design. Delivered production-grade systems supporting 10K+ users per tenant with 35% performance improvement through backend optimization.

Skills & Expertise (30)

React.js Advanced

8.5/10

Years Exp

Node.js Advanced

8.0/10

Years Exp

Git Advanced

8.0/10

Years Exp

GitHub Advanced

8.0/10

Years Exp

Postgresql Advanced

8.0/10

Years Exp

JavaScript Advanced

8.0/10

Years Exp

NestJS Advanced

8.0/10

Years Exp

REST APIs Advanced

8.0/10

Years Exp

Next.js Intermediate

7.5/10

Years Exp

Express.js Advanced

7.5/10

Years Exp

Docker Intermediate

7.0/10

Years Exp

AWS S3 Intermediate

7.0/10

Years Exp

Session management Intermediate

7.0/10

Years Exp

OAuth 2.0 Intermediate

7.0/10

Years Exp

RBAC Intermediate

7.0/10

Years Exp

Vercel Intermediate

7.0/10

Years Exp

JWT Intermediate

7.0/10

Years Exp

Socket.IO Intermediate

7.0/10

Years Exp

WebSockets Intermediate

7.0/10

Years Exp

Redis Intermediate

7.0/10

Years Exp

MySql Intermediate

7.0/10

Years Exp

MongoDb Intermediate

7.0/10

Years Exp

Tailwind CSS Intermediate

7.0/10

Years Exp

Typescript Intermediate

7.0/10

Years Exp

Microservices Intermediate

7.0/10

Years Exp

OpenAI API Intermediate

6.5/10

Years Exp

Render Intermediate

6.5/10

Years Exp

System Design Intermediate

6.5/10

Years Exp

Indexing Intermediate

6.0/10

Years Exp

Query Optimization Intermediate

6.0/10

Years Exp

Work Experience

Full Stack Developer

Teachmania Pvt. Ltd.

Feb 2025 - Present

Architected and built a multi-tenant LMS platform supporting 10K+ users per organization with isolated database architecture and data security. Developed scalable backend services using NestJS, PostgreSQL, and Redis caching, reducing API latency by 35% and improving throughput. Engineered JWT-based authentication with granular RBAC permissions, enabling role-specific access across 50+ system modules. Built real-time event-driven notification system using WebSockets, processing 5,000+ notifications per minute with 99.9% delivery rate for live updates, activity tracking, and instant alerts. Integrated AWS S3 for scalable media storage and optimized file upload pipelines with CDN integration.

MERN Stack Developer

Jetquin Technology

Mar 2025 - Feb 2026

Created enterprise-grade email and collaboration platform using React.js, Node.js, Express.js, PostgreSQL serving 5K+ active users. Enhanced real-time messaging system using Socket.IO supporting 1K+ concurrent connections with persistent storage. Implemented role-based access control (RBAC) with hierarchical permissions for 50+ features, reducing unauthorized access by 60% for team collaboration and workspace management. Improved frontend performance by 30% using code splitting, lazy loading, and React component optimization.

Frontend Developer

Technix India Private Limited

Oct 2024 - Mar 2025

Built responsive enterprise web applications using React.js and Tailwind CSS with 45% better mobile experience. Integrated REST APIs and optimized frontend data flow using React Query, reducing latency by 25%. Created reusable component library with 20+ UI components, improving development speed by 40%.