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Sanjay Kumar - Full-Stack Developer & Security Expert

Portrait of Sanjay Kumar, Full-Stack Developer and Security Expert

Sanjay Kumar

My tech journey began at age 10, and I started programming at 15. Over time, I developed a strong interest in Cybersecurity and explored its various dimensions. After completing my B.Tech in IT, I worked with startups across software development and security, gaining solid industry exposure. Feel free to reach out for a coffee chat, to turn your idea into code, or to consult on software or security solutions.

About Me

Hi, I'm Sanjay Kumar, a passionate technology enthusiast with a deep interest in computers, software, the internet, and cybersecurity.

My journey began when I was in 5th standard—that’s when I got my first computer. From that moment on, I was fascinated by how technology works. One day, I received a random message on social media that made me anxious, but instead of ignoring it, I took it seriously. That fear turned into curiosity, which ultimately sparked my passion for learning more about the digital world.

By the time I reached Grade 11, I joined the Computer Science group at my school and began learning the fundamentals of programming, computer science, and an introduction to machine learning. After completing my higher secondary education (+2), the COVID-19 pandemic hit, and like many others, I found myself with extra time. I used this opportunity to dive deeper into cybersecurity, web development, and how software and computer systems really work.

As I stepped into my college life, I enrolled in a B.Tech in Information Technology. While pursuing my degree, I also began freelancing, exploring bug bounty hunting, and actively participating in internships and job searches. I was fortunate to be selected by a small startup, and during my time there, I gained invaluable real-world experience. Traveling and working with that team helped me grow both technically and professionally.

Today, my enthusiasm for technology continues to grow every day. I'm always learning, building, experimenting, and looking for new challenges that push me forward in this ever-evolving field.

Work Experience

LetGrowMore

Web Developer Internship

2022 - 2023

Collaborated with a dynamic team of developers to create and optimize web applications using a mix of HTML, CSS, JavaScript, and React.js.

React
TypeScript
Web Performance
Accessibility

CodeClause

Python Developer Intern

2022 - 2023

Collaborated as a Python Development Intern with CodeClause, contributing to the design and implementation of dynamic web applications. Leveraged Python, Django, and Flask to create customer-focused e-commerce solutions.

Python
Flask
Django

Zinnox Business Info Tech

Security Analyst

2024 - Current

Participated in vulnerability assessments and penetration testing activities. Assisted in monitoring security systems and analyzing security alerts. Supported the implementation of security policies and procedures.

Cybersecurity
Vulnerability Assessment
Penetration Testing
Network Security

My Education

The Namakkal Teachers Vishyaashram

11th

2018-2020

Specialized in Computer Science With Mathematics

The Namakkal Teachers Vishyaashram

12th

2016 - 2020

Specialized in Computer Science With Mathematics. Started Learning About Python

Global Institute Of Engineering And Technology

Bachelor of Technology (Information Technology)

2020 - 2024

Graduated with distinction. Focused on software architecture, algorithms, and data structures.

My Skills

Programming

C Programming

50%

C ++

60%

Python

80%

Node.js

85%

Databases (SQL & NoSQL)

88%

Cybersecurity

Ethical Hacking

90%

Web App Penetration Testing

92%

Vulnerability Assessment

85%

Secure Code Review

80%

Bug Bounty Hunting

88%

Systems & DevOps

Linux / Unix Administration

90%

Cloud Infrastructure (GCP/AWS)

75%

Docker & Containerization

80%

CI/CD Pipelines

70%

Server Management & Hardening

85%

Web & App Development

React & Next.js

95%

TypeScript

90%

Python & Flask

80%

Node.js & Express

85%

Databases (SQL & NoSQL)

88%

Featured Projects

A selection of my work, showcasing my skills in creating modern and functional applications.

Screenshot of the RUBIKPHISH project

RUBIKPHISH

It is an automated phishing tool that includes more than 30 phishing templates.

Bash
HTML
PHP
Screenshot of the ServerMonPy project

ServerMonPy

In an increasingly interconnected world, the reliable and efficient operation of servers and remote machines is paramount.

HTML
Python
Screenshot of the SSHALERT project

SSHALERT

SSH_ALERT is a Python-based monitoring tool that sends real-time notifications for SSH login attempts (successful and failed) via Telegram

Python
Bash
Screenshot of the RUBIKRECON project

RUBIKRECON

RUBIKRECON is a powerful bug bounty and reconnaissance tool designed to assist in the identification of vulnerabilities and gathering of information during security assessments.

Bash
Screenshot of the File Upload Server project

File Upload Server

simple and reliable file transfer system using a PHP backend integrated with MongoDB and RabbitMQ.

PHP
JavaScript
CSS

From My Blog

Account Takeover by OTP Bypass

Discovered common OTP implementation flaws such as missing session binding, predictable codes, and unsecured APIs lacking rate limiting.

Oct 24, 2022

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I FOUND AN XSS VULNERABILITY JOYALUKKAS

Discovered and responsibly disclosed a reflected XSS vulnerability on the Joyalukkas website during ethical security research.

Oct 25, 2022

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Unveiling a Critical Password Change Vulnerability

Identified an IDOR vulnerability in the password change feature that could allow unauthorized modification of other users' credentials.

Jul 6, 2023

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Exposing the Vulnerable Strings: Long String Attack Vulnerability

Discovered a critical Long String Attack vulnerability that can be exploited to compromise system integrity and user data security.

Jul 6, 2023

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Enhancing Web Security: Developing AdvSQLi for Robust SQL Injection Detection

Developed AdvSQLi, an advanced system designed to detect and prevent SQL Injection attacks, enhancing web application security.

Jun 1, 2024

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Get In Touch

Have a project in mind or just want to say hello? I'd love to hear from you. Feel free to send me a message, drop me an email, or schedule a call directly on my calendar.