HTML
Red · StructureHTML is the skeleton of every page: headings, links, buttons and forms. Tim Berners-Lee created it in the early 1990s.
Here it builds the nav, project cards, calculator keys and game boards.
Open to collaborations
I build fast, secure software for the modern web.
Right now: FastAPI backends
I'm Shubhomoy (Sgdev), a full-stack and AI developer. I work with Python, FastAPI and edge hosting to ship tools that are quick, private and easy to use.
Learning by building.
Every project here started as an experiment and grew into something people can use, from a captcha engine to an AI chat app and RF network case studies.
I care about performance, clean code and keeping things simple, and I'm always open to technical discussions and API integrations.
- BackendPython, FastAPI and Flask on Render and Vercel serverless.
- FrontendSemantic HTML, modern CSS and vanilla JavaScript.
- Security & ResearchHMAC and SHA-256 hashing, network telemetry and RF metrics analysis.
- Deployment & DNSVercel, Hurricane Electric DNS, GitHub Actions and hybrid mail routing.
Three colours, three languages.
Every page here is built with just HTML, CSS and JavaScript. No frameworks. The three accent colours stand for these three languages. Tap a button to repaint the whole site.
CSS
Blue · StyleCSS controls how everything looks: colours, layout, animation and responsive design. It was proposed in 1994 by Håkon Wium Lie.
Here it draws the dark theme, the moving strip, the hover effects and the phone layout.
JavaScript
Yellow · BehaviourJavaScript makes pages interactive. Brendan Eich wrote the first version at Netscape in 1995 in about ten days.
Here it runs the fidget spinner, calculator, SHA-256 tool, password generator and all five games.
Selected projects & research
Tools and technical papers I designed, built and run myself.
S-Captcha Maintenance
A captcha system that needs no database. It layers invisible checks, text challenges and an image honeypot, and rate-limits with hashed IP addresses. It is under maintenance, so it may be briefly unavailable.
Open projectHi, how can I help?Explain FastAPI routes
SAI In development
A chat app for quick answers, code help and developer support. Features are still being added.
Open project5GNSA
Research Blog Active
Independent write-ups on Windows MAS HWID, C2R Office, 5G NSA Network Telemetry.
Visit BlogClock Live
A live clock tool you can open in the browser, built with plain HTML, CSS and JavaScript.
Open ClockDev Tools Live
A collection of handy developer utilities you can use right in the browser, no install needed.
Open Dev ToolsMatrix Terminal Live
A matrix-style terminal that runs right in your browser. Type commands and watch the code rain.
Open TerminalImage Gallery Live
A bearing-style spinning gallery with a built-in image maker. It loads photos and characters from Robohash and Unsplash-style sources, and makes AI pictures with Pollinations.
Open GalleryMore on GitHub Live
Browse the full codebase, experiments and open-source work. These numbers load straight from GitHub when you scroll here.
–repos
–followers
–following
Tools & toys
Small utilities that run fully in your browser. Nothing you type here is sent anywhere.
0
History
- Your calculations show up here.
Arcade
Five quick games written in plain JavaScript. Your scores are saved in your browser only.
Your turn (X)
0You
0Draw
0AI
Moves: 0
Find all 8 pairs in as few moves as you can.
Click the box, wait for it to change colour, then click as fast as you can.
Score: 0 · Best: 0
Arrow keys or WASD to steer, Space to pause. On a phone, swipe on the board or use the pad.
Let's build something together.
Email is the fastest way to reach me. I'm happy to talk about collaborations, technical research, and software integrations.