Sanjay Kumar - Full-Stack Developer & 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.
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.
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.
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.

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

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

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.
File Upload Server
simple and reliable file transfer system using a PHP backend integrated with MongoDB and RabbitMQ.
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
Read MoreI FOUND AN XSS VULNERABILITY JOYALUKKAS
Discovered and responsibly disclosed a reflected XSS vulnerability on the Joyalukkas website during ethical security research.
Oct 25, 2022
Read MoreUnveiling 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
Read MoreExposing 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
Read MoreEnhancing 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
Read MoreGet 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.