Available for new projects
I am Partho Sarothi Paik, a Flutter and full-stack developer based in Dhaka, Bangladesh. I turn app ideas into working products at a fixed price, and I created ECHO, the private AI chat app that runs entirely on your phone.
I build products, not just screens.
I am an independent Flutter and full-stack developer in Dhaka, Bangladesh. Since 2025, I have been helping founders take app ideas from a rough sketch to a working product they can put in front of real users.
My flagship project is ECHO, a private AI chat app that runs large language models entirely on the device, with no account and no cloud. The XERJ Corpus Hub selected ECHO's code as a reference implementation for AI coding agents. Alongside development, I study Finance and Banking at Tejgaon College.
Download CVWhat I work with
Dart, TypeScript, JavaScript, Python, C++
Flutter, React, Three.js, Tailwind CSS, Vite
Node.js, Express, Flask, Supabase, Firebase, PostgreSQL
Git, GitHub, Docker, Linux, Netlify, GetX
Things I have built
Flagship project
Private AI chat, 100% on-device
ECHO runs large language models entirely on the phone. Chats never leave the device, there is no account and no server, and a persona engine recreates the style of people you know from your own chat exports.
Play live, or against the engine
Play against the Stockfish engine or challenge other players live. Realtime sync, accounts, and game state run on Supabase, while the engine runs in the browser with WebAssembly.
A one-tap emergency tool that lives in the browser. One press sends your GPS location by SMS, calls your emergency contact, and sounds a loud alarm. No install, no sign-up.
A desktop coding assistant that runs AI models locally with Ollama. It refactors code with AST awareness, applies precise edits, and runs your tests, all without sending code to the cloud.
Your project could be next
Every project above started as a short message. If you have an app idea, I can turn it into a prototype or a working MVP at a fixed price.
See services and pricesFixed prices. No hourly billing.
A clickable prototype of your app, ready to show and test.
$299
Best for validating an idea.
A working app with the essentials done properly.
$899
Best for launching version one.
The complete first version, built to production standard.
from $1,999
Best for a public launch.
Start with a message. DM 'APP' on any platform, or email me, and I will reply with a plan for your idea.
Start a projectWhere I have been
2025 - Present
Independent / Freelance
I build fixed-price prototypes and MVPs for founders, and develop my own open source products.
2024 - 2025
BNCC
Bangladesh National Cadet Corps training. It built the discipline, teamwork and consistency that I bring to client work.
In progress
Tejgaon College
Studying business alongside my development career, which helps me think about products the way founders do.
Tell me what you are building
Tell me what you are building. I will reply within a day with honest feedback and a fixed-price plan.