Available for Full-Time Roles & Backend Internships

Hi, I'm Sonu Mandal

I architect & build MERN Stack Developer

BCA Student at Vivekananda Global University (CGPA 8.48) with a backend internship at UpToSkills and 2 live full-stack applications deployed. Passionate about building robust REST APIs with Node.js, Express.js, MongoDB, JWT auth, and scalable MVC architecture.

Explore Projects 🚀 Get In Touch ✉️

⚡ Node.js & Express

🌐 React.js + MongoDB

🔒 JWT & Razorpay

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Live Deployed Apps

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Backend Production Projects

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8.48

BCA Academic CGPA

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30+

REST Endpoints Engineered

About Me

Backend-First Philosophy with Full-Stack Capability

Bridging elegant user interfaces with bulletproof server architectures, secure authentication, and high-performance databases.

Hey there! I'm Sonu Mandal, a developer who loves designing clean APIs and efficient database schemas.

I am currently in my final year pursuing a Bachelor of Computer Applications (BCA) in Full Stack and Cloud Computing at Vivekananda Global University, Jaipur, holding an academic CGPA of 8.48.

My hands-on experience includes working as a Backend Developer Intern at UpToSkills (UTS), where I maintained and extended backend features using Node.js, Express.js, and MongoDB, adhering strictly to the MVC architecture.

Beyond theory, I build and deploy real applications. I have 2 full-stack applications deployed live on custom domains: SkillArena (a DSA coding competition platform) and Grocery Website (a complete e-commerce platform with Razorpay payments and Google OAuth).

⚡ Key Focus: Building systems that are modular, maintainable, and resilient against edge cases. I test every single endpoint thoroughly in Postman before shipping.

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MVC Architecture

Clear separation between Mongoose data models, Express business logic controllers, and routes for maximum maintainability.

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Hardened Auth & Security

Stateless JWT tokens, Google OAuth 2.0 integration, bcrypt password salt-hashing, and input sanitization middleware.

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Database Modeling

Normalized and indexed schemas in MongoDB with Mongoose ODM, dynamic aggregations, and relational schemas in MySQL.

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Payment & 3rd-Party APIs

End-to-end payment gateway orchestration with Razorpay, HMAC SHA256 webhook validation, and Postman API automation.

Technical Arsenal

Skills & Proficiencies

Extensively used across production codebases, internship workflows, and deployed platforms.

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Backend & APIs

Node.js 90%

Express.js 92%

REST API Design 95%

MVC Architecture 90%

Custom Middleware 88%

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Auth & Security

JWT (JSON Web Tokens) 92%

Google OAuth 2.0 85%

bcrypt Password Hashing 90%

Protected Route Guards 94%

Input Validation & Sanitization 88%

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Databases

MongoDB 90%

Mongoose (ODM) 92%

MySQL (Relational) 82%

Data Aggregations 86%

Indexing & Query Optimization 84%

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Frontend (React)

React.js 88%

HTML5 & Semantic Web 95%

CSS3 / Modern Responsive 90%

State Management & Hooks 87%

API Client Integration (Fetch/Axios) 94%

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Programming Languages

JavaScript (ES6+) 92%

C++ (DSA & Problem Solving) 80%

Asynchronous Programming 95%

Data Structures & Algorithms 85%

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Tools & Integrations

Postman API Testing 94%

Git & GitHub 92%

Razorpay Payment Gateway 88%

VS Code / Dev Tooling 95%

Career Journey

Work Experience & Education

Professional backend development internship experience backed by strong academic fundamentals.

💼 Internship Experience

Backend Developer Intern

Jun 2026 – Sep 2026

UpToSkills (UTS) • Remote, India

Maintained and extended backend features in Node.js, Express.js and MongoDB, following the MVC architecture.

Wrote and tested REST API endpoints in Postman, resolving edge-case bugs to improve response reliability and error handling.

Collaborated closely with the senior engineering team on code reviews, Git pull request workflows, and deployment cycles.

Node.js Express.js MongoDB MVC Architecture Postman Git

Verified Certificate 2026 View in Resume ↗

🎓 Education & Certifications

Bachelor of Computer Applications

2024 – 2027

Vivekananda Global University, Jaipur

Academic CGPA: 8.48

Specialization: Full Stack and Cloud Computing.

Core coursework in Data Structures, Object-Oriented Programming (C++), Database Management Systems (SQL & NoSQL), and Web Technologies.

Full Stack Cloud Computing DBMS C++

Backend Developer Certificate

2026

UpToSkills (UTS)

Awarded for demonstrating professional competence in developing production REST APIs, Node/Express middleware, and MongoDB databases.

Industry Credential

Featured Work

Production & Live Deployed Projects

Explore live deployed MERN applications and backend microservices with real users and payments.

Flagship Platform

Live Deployed

                Jul 2026 – Present
              

SkillArena — MERN Coding & DSA Platform

Engineered a comprehensive MERN-stack coding and DSA practice platform with JWT-secured user sessions, live submission evaluations, and a competitive ranking engine.

Implemented REST endpoints across 5 modules: challenges, code submission, XP scoring, statistics, and leaderboard.

Designed Mongoose data models and MVC controllers seamlessly integrated with React.js frontend.

Secured with stateless JWT authentication, protected routes, and bcrypt salt hashing.

MongoDB Express.js React.js Node.js REST API JWT

Grocery Website - Full Stack E-Commerce Application

E-Commerce + Payments

Live Deployed

                Jan 2026 – Mar 2026
              

Grocery Website — Full Stack E-Commerce

Developed an end-to-end full-stack e-commerce platform on the MERN stack with MVC architecture, supporting full CRUD, dual authentication, and Razorpay payment processing.

Architected REST APIs for 4 modules: products, cart, orders, and users.

Secured with 2 authentication flows: JWT sessions and Google OAuth 2.0.

Integrated the Razorpay payment gateway enabling seamless checkout from cart to verified order.

Node.js Express.js MongoDB React.js Razorpay Google OAuth JWT

Backend Services

                Mar 2025 – Apr 2025
              

Hostel Booking System — Backend APIs

Modular backend microservices for hostel room booking, room inventory creation, availability checks, dynamic date calculations, and Postman automated testing.

Delivered services for room creation, status updates, and date-range availability checks.

Added centralized validation and error handling to keep data consistent.

Tested every endpoint in Postman with test suites throughout development.

Node.js Express.js MongoDB Mongoose REST API Postman

Get In Touch

Let's Build Something Exceptional

Have a role, project, or question? Feel free to reach out and let's start a conversation.

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Phone / WhatsApp

+91 8252663421

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Email Address

sonu.bcastudent@gmail.com

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Location

Jaipur, Rajasthan, India

Open to Relocate

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linkedin.com/in/sonu-mandal-9b878a344

Visit ↗

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GitHub

github.com/sonumandal-gh