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Hi, I’m Krishnendu

Backend Developer building scalable,
secure, and high-performance systems
using modern technologies.

About Me

I'm a backend developer focused on building scalable, secure, and high-performance server-side systems. I enjoy designing APIs, working with databases, and optimizing application performance.

My goal is to turn complex business requirements into reliable backend solutions that power modern web applications.

What I'm Doing

Backend Development

Building REST & GraphQL APIs using Node.js, Express, and modern backend frameworks.

Database Design

Designing efficient schemas with MongoDB, PostgreSQL, and Redis.

Auth & Security

Implementing JWT, OAuth, role-based access, and secure API practices.

Cloud & Deployment

Deploying scalable apps using Docker, CI/CD, and cloud platforms.

Backend Proficiency

Tech Stack

Leveraging modern backend technologies to build scalable, high-performance applications with robust database management and containerization.

Proficiency Level

Node.js
85%
Express.js
80%
MongoDB
75%
PostgreSQL
70%
Docker
65%
Based on projects completed and active development hours.

Recognition

Certificates

Verified certifications showcasing my technical expertise and continuous skill development

androidApr 2025

The Complete Android 15 Course – Master Java & Kotlin

Completed a 65.5-hour Udemy course covering Android fundamentals, Java & Kotlin, app architecture, UI, and best practices for modern Android development.

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Data AnalysisJuly 2025

The Complete Data Analyst Bootcamp

End-to-end data analysis training covering Python, Pandas, NumPy, data visualization, and real-world analytics workflows.

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Generative AIJan 2026

Generative AI Complete Bootcamp

Comprehensive hands-on training covering NLP, Transformers, LLMs, and modern Generative AI workflows.

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Data AnalysisJan 2026

Google Analytics 4 Fundamentals

Learned GA4 fundamentals including event-based tracking, reports, conversions, and audience insights for modern web analytics.

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Artifacts

My Projects

Featured
Team
2025

LibriX

Librix is a community-driven book platform where users can buy, sell, rent, and reverse-bid on books, blending traditional reading culture with smart, modern technology.

341
JavaScriptReact.js 19Socket.ioLightsWind UITailwind
in-progress
2023

Insightly

Insightly is a social media analytics dashboard that aggregates scraped engagement data, delivering clear visual insights for creators through robust backend logic and interactive data visualizations.

178
TypeScriptWeb Scrapping Youtube ApiData Visualization
Personal
2020

PayNest

PayNest is a secure payment dashboard and analytics platform that visualizes transactions and enables seamless UPI-based money transfers with real-time insights and robust API integration.

195
AA SandboxUPI WrapperCharts.js
Team
2025

Mann-Mitra

MannMitra is an AI-powered mental wellness platform offering voice chat support, personalized assessments, private journaling, and a supportive community to promote emotional well-being.

94
React 19Gemini ApiMongoDBStripe
Team
2022

BimarBanda.ai

BimarBandaAI combines cutting-edge artificial intelligence with healthcare expertise to provide instant, reliable medical assistance. Our platform ensures everyone has access to quality medical guidance.

418
PythonShadcnSocial
Team
2023

Algo-Rhythm

Algo Rhythm is a professional freelancing team delivering high-quality web and mobile applications, combining innovative design, robust development, and goal-oriented digital solutions for businesses.

133
React 19Email.jsShadcnTailwind 3
Team
2025

Ticket Kaku

Ticket Kaku is a Kolkata-focused ticket booking platform that lets users easily discover and book tickets for museums, parks, and historical sites in one place.

81
Tailwind 3Gemini ApiStripe
Personal
2024

JAVA: Basics To Advanced

Structured Java learning repository covering core concepts to advanced topics, with clean examples, best practices, and progressive problem-solving.

196
JavaIntelliJJDKDSA

Featured Articles

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Let's Connect

I am always interested in internships, hackathons, open-source projects, and freelancing opportunities. I value collaboration and enjoy contributing to impactful, well-crafted solutions.

© 2026 Krishnendu Mandal. All rights reserved.