Cybersecurity Enthusiast (Web App Security) • Web Developer • CSE Student (AIUB)
Sagar Biswas is a Computer Science and Engineering (CSE) student at American International University–Bangladesh (AIUB), a cybersecurity enthusiast, ethical hacker (web application security), and web developer.
This is the official GitHub profile of Sagar Biswas, known online as SagarBiswas-MultiHAT, where he publishes open-source projects, cybersecurity tools, learning notebooks, and web development work.
- Name: Sagar Biswas
- Username: SagarBiswas-MultiHAT
- Field: Web Developer, Cybersecurity (Ethical Hacking, Web App Security)
- Role: BSc in Computer Science And Engineering (CSE) Student at American International University Bangladesh
- Country: Bangladesh
- e-Portfolio: https://sagarbiswas.multihat.dev/
☯️ Live From Private Repos:
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PromptVault - Your private, offline-first library for AI prompts. Securely save, organize, and perfect your instructions using a built-in AI Librarian. Features PIN-protection, categories, fill-in-the-blank variables, and optional cloud sync. Own your workflow without subscriptions. 🚀🔒
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PhishGuard is a fast-paced web game that trains your instincts against email phishing. Powered by a Dual-AI Consensus Engine (OpenRouter & Groq), it generates and verifies highly realistic, unique phishing scenarios in real-time. Can you spot the scam before the 10-second timer runs out?
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sydneywheelsandtyres - A premium, high-performance static marketing website for Sydney Wheels & Tyres. Built with Next.js, TypeScript, and Tailwind v4, it features immersive UI animations, 3D tilt cards, automated sitemaps, and rich local business schema. Designed to maximize SEO discoverability, showcase auto services, and drive customer bookings in Campbellfield.
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sagarbiswas-multihat.github.io - A privacy-first, static developer & cybersecurity portfolio for Sagar Biswas (MultiHAT). Fast, SEO-friendly GitHub Pages site showcasing projects, tutorials, and blog posts; includes RSS, sitemap, responsive design, and easy rebuild scripts��ideal for sharing work, demos, and technical write-ups.
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multihat.dev - This is my personal cyber-themed command deck showcasing AI systems, cybersecurity tools, and high-performance web apps. Built with Next.js 15 and Tailwind, it features a privacy-first architecture and robust SEO to highlight live projects like PromptVault and PhishGuard.
Link: https://multihat.dev/
📢 Live From Public Repos:
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WiFi-QR-Generator - Generate Wi‑Fi QR codes instantly in your browser, no backend required. Supports WPA/WPA2, WEP, and open networks; hidden SSIDs; adjustable size and error correction; export PNG or SVG; copy raw Wi‑Fi payload; offline-friendly (local QR lib). Privacy-first: nothing leaves your device.
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Password-Strength-Checker - A polished, accessible client-side password strength checker that estimates entropy, detects weak patterns, and provides actionable suggestions. Includes a built-in password generator, works fully offline with no network calls, and uses ARIA live updates for accessibility. Ideal for demos, portfolios, or frontend components.
Link: http://psc.multihat.dev/
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SharpLink-URL-Allies - A clean Flask-based URL shortener that converts long links into short, shareable URLs with optional custom aliases, expiration support, and TinyURL mirroring. Uses SQLite for persistence, includes copy helpers, rate limiting, and a simple REST API. Ideal for learning backend fundamentals and deployment.
👋 About Me
Hi! I’m Sagar Biswas, a passionate coder, web developer, and focused on web application security assessment and vulnerability analysis from Bangladesh. With a strong foundation in computer science, I’m on a mission to master the art of cybersecurity and make the web a safer place.
🌟 What I’m About
I’m deeply driven by curiosity and the thrill of solving problems. Whether it’s building secure web applications or uncovering vulnerabilities, I love learning, experimenting, and improving my skills every day.
💻 What I’m Working On
Currently, I’m focused on:
Enhancing my penetration testing skills with practical, hands-on experience.
Developing secure and efficient web applications.
Strengthening my knowledge of programming languages like Python, C++, Bash scripting, and more.
📫 Let’s Connect!
I’m always eager to connect with fellow developers, cybersecurity enthusiasts, and learners. Check out my repositories to see what I’m working on, or feel free to reach out. Let’s collaborate, share ideas, and grow together! 🚀
Skills: Python | C++ | C | C# | Java | ArduinoScripts | BashScripts | html | css | JSON | javascript | AJAX | PHP | React | NestJS | Web Security.
- 🔭 I’m currently working on Exploring advanced penetration testing techniques and applying them to real-world scenarios.
- 🌱 I’m currently learning CSE at American International University Bangladesh (AIUB).
- 👯 I’m looking to collaborate on Open-source projects focused on cybersecurity and web security.
- 🤔 I’m looking for help with Improving my penetration testing skills and learning advanced techniques.
- 💬 Ask me about Programming Languages, Network Security, Linux Tools.
- 📫 How to reach me: sagarbiswas@multihat.dev || 01727361077
- 😄 Pronouns: He/Him
- ⚡ Fun fact: My biggest weakness: when I am engaged with any work, I can't keep concerned with other work without finishing that.
If you discover a security issue in any of my projects, please contact me directly at 
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Resume: resume PDF
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Certifications: Google Drive
- Certifications:
- Certified Phishing Prevention Specialist (CPPS)
- Certified Red Certificate
NOTE: To find more notebooks, projects, tips and tricks like this, join my Facebook community group and check the featured section for notebooks and explore the Posts to discover real-world projects.
