Services
Website development
Fast, animated websites and web apps — designed and built end to end in Next.js and React.
Saptarshi Chattopadhyay (Sappy) is a freelance website developer based in Kolkata, India, working with clients worldwide. He designs and builds websites and web apps end to end: React and Next.js on the front end, Python and FastAPI behind them, and motion or 3D with GSAP and Three.js where it helps the story.
What you get
Design and build
A site designed around your content and built in Next.js and React, styled with Tailwind CSS or plain CSS.
Motion and 3D
Scroll storytelling with GSAP and Three.js when it serves the message — and restraint when it doesn’t.
Back end and AI features
APIs in Python and FastAPI, working forms, and LLM features through APIs such as Groq.
Search and speed
Static rendering, right-sized images and fonts, structured data and clean metadata, so pages load fast and are easy to find.
Checked everywhere
Tested across devices and browsers before release.
Selected work
How it works
Brief
You share the goal, the audience, references and timing. I reply with questions and an estimate.
Design
Structure and look are agreed first, before any code.
Build
The site is built in small steps you can review on a live preview link.
Launch
Deployed, checked across devices, and handed over with notes on how to update it.
Tools React · Next.js · Tailwind CSS · Three.js · GSAP · Python · FastAPI · Vercel
Questions
Do you work with clients outside India?
Yes. I’m based in Kolkata and work remotely with teams anywhere.
What do you build websites with?
React and Next.js for the front end, Tailwind CSS or plain CSS for styling, Three.js and GSAP for 3D and motion, and Python with FastAPI for back ends and APIs.
Can you make the launch video as well?
Yes. I also edit video and motion graphics in Premiere Pro and After Effects, so the site and its film can come from one person. See video editing.
Will the site be fast and easy to find?
Pages are statically rendered where possible, with right-sized images and fonts, structured data, a sitemap and clean metadata — the same setup this site runs on.
How do I get a quote?
Send a short brief through the contact form: what you’re making, who it’s for and when it needs to ship. I usually reply within 24 hours.
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