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Sanjai Uthup Thomas
Available for work

Hi, I'm Sanjai

Full Stack Developer

I build scalable full-stack applications with clean architecture, focusing on performance, reliability, and real-world impact.

About Me

WHO I AM & WHAT I DO

I’m a Full Stack Developer focused on building scalable backend systems and high-performance applications. I specialize in Node.js, NestJS, and microservices architecture, with a strong emphasis on clean code, system design, and performance.

On the frontend, I create intuitive user experiences using React.js and React Native, ensuring smooth performance and maintainable architecture across applications.

I enjoy taking ownership of projects end-to-end — from design to deployment — continuously learning and building systems that are reliable, efficient, and production-ready.

Technical Skills

TECHNOLOGIES I WORK WITH

JavaScriptJavaScript
Node.jsNode.js
REST APIsREST APIs
PostgreSQLPostgreSQL
MicroservicesMicroservices
DockerDocker
GitGit
JavaScriptJavaScript
Node.jsNode.js
REST APIsREST APIs
PostgreSQLPostgreSQL
MicroservicesMicroservices
DockerDocker
GitGit
TypeScriptTypeScript
NestJSNestJS
gRPCgRPC
JWTJWT
StripeStripe
NginxNginx
PostmanPostman
TypeScriptTypeScript
NestJSNestJS
gRPCgRPC
JWTJWT
StripeStripe
NginxNginx
PostmanPostman
React.jsReact.js
Express.jsExpress.js
MongoDBMongoDB
OAuth2OAuth2
RazorpayRazorpay
AWSAWS
React.jsReact.js
Express.jsExpress.js
MongoDBMongoDB
OAuth2OAuth2
RazorpayRazorpay
AWSAWS

Experience

WHERE I’VE WORKED & WHAT I BUILT

Software Engineer

NewAgeSMB • Kochi • 2023 – 2025

Led development of cross-platform mobile applications using React Native, focusing on performance, scalability, and seamless user experience.

Designed and built scalable backend services and APIs using Node.js, Express.js, and NestJS with clean architecture principles.

Developed responsive web applications using React.js, Next.js, and Tailwind CSS.

Integrated third-party APIs, authentication systems, and secure payment gateways.

Collaborated closely with cross-functional teams to deliver production-ready features and maintain high code quality.

Freelance Web Developer

Self-employed • Kochi • 2019 – Present

Built responsive and modern websites using JavaScript and React, focusing on performance and usability.

Managed end-to-end project delivery including UI/UX design, backend development, and deployment for multiple clients.

Projects

SELECTED WORK & SYSTEMS I’VE BUILT

DevX API Suite (In Progress)

NestJS • PostgreSQL • MongoDB • gRPC • Docker • API Gateway • Microservices

Building a scalable, production-grade microservices backend using NestJS, featuring API Gateway, gRPC-based communication, and modular services including Auth, User, Chat, and Notification systems with a hybrid database approach.

• Implemented API Gateway with centralized routing

• gRPC-based inter-service communication (User & Notification services)

• Hybrid database architecture:

– PostgreSQL for relational data (Auth & core services)

– MongoDB for scalable, document-based services (User, Chat, Notification)

• Modular microservices with independent data layers

• Dockerized services for scalable deployment

• CI/CD pipeline setup (in progress)

DevX Project

Social Media Platform

React • Node.js • Express • Socket.io • MongoDB • JWT • AWS EC2 • Nginx

Built and deployed a full-stack social media platform with real-time communication, featuring scalable backend infrastructure hosted on AWS EC2 with Nginx-based load balancing.

• Real-time messaging system using Socket.io (WebSockets)

• Secure authentication using JWT

• Full CRUD for posts, comments, and user interactions

• Deployed frontend & backend on AWS EC2 instances

• Configured Nginx as reverse proxy and load balancer

• Managed production environment with process handling & routing

• MongoDB for scalable, document-based data storage

Social Media

Watchmen – E-commerce Platform

Node.js • Express • MongoDB • Razorpay • PayPal • Twilio • AWS EC2 • Nginx

Developed and deployed a full-featured e-commerce platform with secure payment integration, real-time order management, and a custom admin dashboard for business analytics.

• Integrated multiple payment gateways (Razorpay & PayPal)

• OTP-based authentication using Twilio

• Advanced admin dashboard with sales reports, charts & analytics

• Complete order lifecycle (cart → checkout → delivery)

• Coupon, wallet & offer system for dynamic pricing

• MongoDB-based scalable product and user data management

• Deployed on AWS EC2 with Nginx reverse proxy & load balancing

• Designed infrastructure for handling concurrent users and traffic distribution

Watchmen

Let’s Work Together

BACKEND • FREELANCE • COLLABORATION

Full Stack Developer • Building Scalable Systems

I build high-performance full-stack applications — combining scalable backend systems, clean architecture, and intuitive user interfaces to create reliable, production-ready solutions.

From designing systems to deploying them in production, I focus on performance, maintainability, and real-world impact. Let’s connect and build something meaningful.

Available for work

GET IN TOUCH

Have a project, idea, or opportunity? Feel free to reach out — I’ll get back to you soon.