Web3 & Full-Stack Developer

I build Web3 products, websites, and tools you can launch.

I'm Jubayir Haider, a Web3 and full-stack developer in Dhaka. I build dApps, business and portfolio sites, Telegram bots, and automation tools.

For founders and teams who need a working product they can launch.

Start your project See the work

4 live products 3 hackathon builds

Available for freelance projects and remote roles

About

Web3 and full-stack developer

Bio

I build Web3 applications, along with the websites, bots, and tools around them. That includes dApps, business and portfolio sites, Telegram bots, and automation.

I also take part in Web3 communities through early-access programs, ambassador roles, and moderation support. That experience helps me build products people can join, understand, and maintain.

I am based in Dhaka and open to freelance projects, collaborations, and remote roles.

What I build dApps, websites, bots, and automation
Who it's for Founders, teams, and Web3 projects
How we start A short brief by email

What I use for websites, apps, bots, and automation. The live projects below are the work you can open.

Frontend

HTML & CSS JavaScript TypeScript React Next.js

Websites

Business sites Portfolios Web apps

Automation

Telegram bots Workflows Python

Tools

GitHub Vercel

Work

Selected projects

Start with dSpaces. Three more live products and three hackathon builds are below.

Featured project

Featured

dSpaces

Video meetings on a decentralized network. People join with a wallet or email, and an assistant in the room can help during the call. I built the product, including sign-in.

Live now. Open it and join a room.

dTelecom Wallet or email sign-in In-room assistant

Open app GitHub

More live work

Live

Nexio-app

A stablecoin dashboard on Arc Network for balances, batch transfers, and .nex domains. I built the web app for those flows.

Next.js Arc Network

Open app GitHub

Live

Shelby

An asset workshop on Shelby testnet. It uploads media, embeds an encrypted watermark, and checks asset integrity. This is my app on Shelby. It is separate from my Early Access role in the Shelby community.

React Aptos SDK

Open app GitHub

Live

GenWork

A freelance marketplace on GenLayer. Jobs, escrow, and disputes stay on-chain, with GenLayer used for AI-assisted checks. I built the marketplace and the on-chain flow.

GenLayer Smart contracts

Open app GitHub

Hackathon builds

Short hackathon experiments, written in plain language. They show range. They are not client work.

Hackathon

LEASH Protocol

A safety switch for AI agents. It checks what an agent is allowed to do, and can stop the agent when it goes too far.

JavaScript Python Solidity

Code not public yet.

Hackathon

SentinelOS

A guard for automated trading. It watches market data and asks a person to approve any action that cannot be undone.

Python MCP

Code not public yet.

Hackathon

CHRONOS-NEXUS

A prototype for events that run across more than one blockchain: who is taking part, and how the payment is settled.

Code not public yet.

Ecosystem

Selected roles

Community and early-access roles. They show trust and involvement. They are not full-time jobs.

Each role includes a screenshot from the community that granted it.

Shelby Early Access

Shelby · Early Access

Accepted into Shelby Early Access, with testnet approval.

Shelby Discord roles including Early Access, Creator, Developer, and Verified

Shelby Serves approval message for Early Access to Shelby testnet

dTelecom OG Ambassador

dTelecom · OG Ambassador

OG Ambassador in the dTelecom Discord.

dTelecom welcome message tagging @JUBAYIR69 as a new ambassador

dTelecom Discord roles including OG Ambassador, Origin ID, and Verified

Official Architect at ARC House

ARC House · Community role. Recognized as Official Architect in ARC House.

Services

What I can build for you

Practical work for founders, teams, and communities. Clear scope, working software, and direct communication.

Web3 development

dApps, wallet sign-in, dashboards, and the screens around a smart contract. Shipped on Arc, Aptos, GenLayer, and dTelecom.

Start a Web3 project

Business and portfolio websites

A site that explains the offer and turns a visit into a conversation. For companies, founders, and personal brands.

Start a website

Telegram bots and automation

Bots and small tools for updates, workflows, and repetitive tasks. Less manual work for the team.

Start a bot

Community and ecosystem support

Moderation and launch support around a product you are already building. This supports the build. It does not replace it.

Discuss support

Contact

Tell me what you need built

Open to freelance projects, collaborations, and remote roles. Email is the best way to start. LinkedIn, Discord, and GitHub are here for the profile and the code.

Best ways to reach me