Senior
Blockchain developer🔷️🔶️Available now

Average Review

5.00

Reputation

420

Finished gigs

18

Finished jobs

1

Website

Country

Not specified

Specialization

professional

Hourly rate

$25/hr

Preferred payment options

ETH

USDT

TIME

USDC

DAI

MATIC

SHIB

TIME

USDC

BNB

BUSD

MATIC

USDT

TIME

USDC

MATIC

About me

I am a Web3 & Solidity engineer specializing in launch-critical blockchain infrastructure — from token contracts and NFTs to DeFi platforms, DAO governance, and production-ready dApps. I help founders, startups, and Web3 teams build secure, scalable, and audit-ready smart contracts that are designed for real users and mainnet deployment, not experiments. Core expertise includes: • Solidity smart contracts (ERC20, ERC721, ERC1155) • Token launch systems (presale, vesting, claim, fair-launch logic) • DeFi development (DEX, staking, yield farming, liquidity systems) • DAO governance & on-chain voting • NFT minting, marketplaces & staking • Web3 dApp development (React + Web3.js / Ethers.js) • Wallet integration (MetaMask, WalletConnect) I follow a security-first, clean-code approach with clear communication, fast response, and post-delivery support. My goal is simple: help you launch correctly 📩 Message me to discuss your idea.👇 https://t.me/@jaymark57 markbossy08@gmail.com

markbossy08@gmail.com

https://t.me/jaymark57

https://t.me/jaymark57

Work experience

crypto & blockchain

March 2024 – March 2024

Job title

PancakeSwap Fork

Work experience & achievements

Project Link: https://ibullswaptestnet.web.app/ This project is a custom fork of PancakeSwap, a decentralized exchange (DEX) platform built on the Binance Smart Chain (BSC). The platform provides seamless and secure token swapping, liquidity provision, and staking functionalities. It includes a user-friendly interface and advanced features tailored to enhance the DeFi ecosystem experience. Key Features: 1. Token Swapping 2. Liquidity Pools 3. Farming and Staking 4. Custom Modifications 5. Responsive Design

dapp finance

May 2024 – June 2024

Job title

$MyloCat - Token swap on Solana

Work experience & achievements

We have developed a sophisticated swapping platform on the Solana blockchain for the $MYLO token. This platform enables seamless exchanges between any existing native Solana tokens and $MYLO. The swapping operations are powered by Jupiter Space Station, ensuring efficient and secure transactions. Additionally, our solution integrates a wallet adapter that allows users to access Phantom and other Solana-based wallets through MetaMask, providing a versatile and user-friendly experience. url: https://mylocat.xyz/

Dapp

September 2025 – October 2025

Job title

ICO - $CATS

Work experience & achievements

We have made this decentralised ICO on Ethereum, It has 10 stages and every stage has some goal to raise a certain amount of USD. Payment acceptance in both native token USDT and native currency ETH. In this token are claimable after presale ends. Metamask and wallet connect are integrated for payment support. Users will get presale updates via their subscribed emails. https://justcats.tv/

Token Presale

July 2025 – July 2025

Job title

BBETS ICO on BSC

Work experience & achievements

We have build an ICO of $BBETS for token presale on BSC. In this people are able to do staking and get rewards during presale. Tokens are claimable after presale ends, vesting period is scheduled. Payment acceptance in ETH, BNB, ARB(ETH) and their native tokens. Technology stack used for building this project is MERN. In this, there are several stages of the presale and some perks to users like staking rewards, bonus, whitelisting, referral system. https://presale.blockbets.casino/

bitcoin company

June 2025 – July 2025

Job title

Solana and Bitcoin Bridge

Work experience & achievements

We have created a blockchain bridge allowing the transfer of BRC20 tokens between the Bitcoin (BTC) blockchain and the Solana blockchain like Sobit bridge. It includes a BTC wallet for token lock/release, a Solana smart contract for minting/burning tokens, and a Node.js Application For Cross-chain communication. We integrated Unisat wallet and Phantom wallet. We made a solana token smart contract as we need to perform token minting and burning corresponding to BTC transactions.

blockchain tools

September 2024 – October 2024

Job title

ICO Tool

Work experience & achievements

I spearheaded the development of the X COIN ICO website, integrating Wallet Connect for seamless wallet connection and a smart contract for secure token purchases. Additionally, I crafted a presale contract using Solidity, ensuring a smooth and reliable token acquisition process for early investors. The project successfully delivered a fully functional ICO website, streamlined token purchase processes, and facilitated a successful presale campaign.

Education

University of france

Graduation year: 2009

Level of study

Bachelor

Major / Field of study

Engineering

Senior Blockchain developer🔷️🔶️Available now

5

(19)

Solidity Smart Contract Debugging & Gas Optimization (Fix Reverts & Failed Transactions)

Blockchain & Crypto

Smart Contract Development

$200

Senior Blockchain developer🔷️🔶️Available now

5

(19)

Token Presale, Vesting & Claim dApp Setup or Emergency Fix for Web3 Launches

Blockchain & Crypto

Smart Contract Development

$150

Senior Blockchain developer🔷️🔶️Available now

5

(19)

PancakeSwap Fork on BSC, Polygon & Fantom — Full DEX Website + Smart Contracts

Blockchain & Crypto

Smart Contract Development

$500

Senior Blockchain developer🔷️🔶️Available now

5

(19)

Complete DeFi DEX, Staking & Yield Farming Platform

Blockchain & Crypto

Smart Contract Development

$700

Senior Blockchain developer🔷️🔶️Available now

5

(19)

Solidity Smart Contract & Web3 dApp Development (ERC20, NFTs, Staking)

Blockchain & Crypto

Smart Contract Development

$300

Senior Blockchain developer🔷️🔶️Available now

5

(19)

Fix WalletConnect, MetaMask & Web3 Integration Issues in Your dApp

Blockchain & Crypto

Smart Contract Development

$150

Senior Blockchain developer🔷️🔶️Available now

5

(19)

PancakeSwap Fork / Clone DEX with AMM, Farming & Staking

Blockchain & Crypto

$500

Senior Blockchain developer🔷️🔶️Available now

5

(19)

Multi-Chain Token Presale, Vesting & Claim dApp (Solidity + React)

Blockchain & Crypto

Smart Contract Development

$400

Senior Blockchain developer🔷️🔶️Available now

5

(19)

Deploy, Verify & Configure Your ERC20 / BEP20 Token for a Safe Launch

Blockchain & Crypto

Smart Contract Development

$500

Senior Blockchain developer🔷️🔶️Available now

5

(19)

DAO Governance & On-Chain Voting dApp (Solidity + React)

Blockchain & Crypto

Smart Contract Development

$500

5

(2)

22 Jan 2023

Average Rating

Good job

5

(5)

5 Nov 2023

Average Rating

He was really efficient and nice to work with

5

(5)

24 Feb 2024

Average Rating

He really have great experience in blockchain field... Will hire you again on my next project

5

(3)

21 Sep 2024

Average Rating

Good job

5

(3)

2 Oct 2024

Average Rating

Am satisfied with his work...thank so much for the good job.

5

(3)

6 Oct 2024

Average Rating

He delivered on time, with great attention to detail and smooth communication throughout. Highly recommend for any blockchain project!

5

(3)

11 Nov 2024

Average Rating

Very friendly

5

(4)

30 Nov 2024

Average Rating

He did exactly what I requested for. Highly recommend for any team looking for reliable blockchain developer.

5

(5)

25 Dec 2024

Average Rating

I recommend him

5

(4)

1 Jan 2025

Average Rating

Highly recommend

5

(7)

17 Jan 2025

Average Rating

Delivered as expected 👏

5

(4)

21 Mar 2025

Average Rating

Good blockchain developer...I recommend him for any team who need quality blockchain developer

5

(4)

5 Jun 2025

Average Rating

Best blockchain developer

5

(4)

10 Jun 2025

Average Rating

I highly recommend this developer for any blockchain web3 project, communication was smooth throughout and the developer was quick to handle revisions.

0

(0)

5 Nov 2025

Average Rating

Very professional and easy to work with!

Flaviussarsan .

5

(3)

27 Dec 2025

Average Rating

Working with him was an absolute pleasure. The delivery was smooth, we had no trouble deploying and came with good documentation, showcasing pure professionalism! The proactive communication and responsiveness made the whole process very fast and there was great cooperation throughout the project 🙌. Highly recommended for blockchain development!

5

(1)

2 Jan 2026

Average Rating

Thanks for your help. amazing work. fast delivery. My presale site works good.

5

(2)

10 Jan 2026

Average Rating

He is a highly skilled engineer, and his technical knowledge is very reliable. Whenever an issue came up, his response was quick and effective, and he handled everything professionally. Overall, his support and problem-solving ability were excellent.

finanace auditor

5

(4)

13 Jan 2026

Average Rating

Really good dev, he did everything professionally.

Meme Coin Presale dapp

The presale for the meme coin is crucial for launching the project successfully, attracting many investors, and ensuring sufficient liquidity. The client simply needed to provide the UI design and the presale framework, which includes details like the presale tiers, sale price for each tier, the currency for transactions, the soft cap, and vesting logic, among other things. The presale dApp is compatible with multiple cryptocurrencies across various blockchain networks, including ETH on Ethereum and SOL on Solana, as well as any other options you choose. We can develop the presale dApp perfectly in just three days.

ibullswap

Project Link: https://ibullswaptestnet.web.app/ This project is a custom fork of PancakeSwap, a decentralized exchange (DEX) platform built on the Binance Smart Chain (BSC). The platform provides seamless and secure token swapping, liquidity provision, and staking functionalities. It includes a user-friendly interface and advanced features tailored to enhance the DeFi ecosystem experience. Key Features: 1. Token Swapping 2. Liquidity Pools 3. Farming and Staking 4. Custom Modifications 5. Responsive Design

$MyloCat

Token swap on Solana We have developed a sophisticated swapping platform on the Solana blockchain for the $MYLO token. This platform enables seamless exchanges between any existing native Solana tokens and $MYLO. The swapping operations are powered by Jupiter Space Station, ensuring efficient and secure transactions. Additionally, our solution integrates a wallet adapter that allows users to access Phantom and other Solana-based wallets through MetaMask, providing a versatile and user-friendly experience. url: https://mylocat.xyz/

$CATS

We have made this decentralised ICO on Ethereum, It has 10 stages and every stage has some goal to raise a certain amount of USD. Payment acceptance in both native token USDT and native currency ETH. In this token are claimable after presale ends. Metamask and wallet connect are integrated for payment support. Users will get presale updates via their subscribed emails. https://justcats.tv/

BBETS ICO on BSC

We have build an ICO of $BBETS for token presale on BSC. In this people are able to do staking and get rewards during presale. Tokens are claimable after presale ends, vesting period is scheduled. Payment acceptance in ETH, BNB, ARB(ETH) and their native tokens. Technology stack used for building this project is MERN. In this, there are several stages of the presale and some perks to users like staking rewards, bonus, whitelisting, referral system. https://presale.blockbets.casino/

Local Traders | ICO Website

It is an ICO Website with the presale stages, vesting and all the features.

ICO Tool

I spearheaded the development of the X COIN ICO website, integrating Wallet Connect for seamless wallet connection and a smart contract for secure token purchases. Additionally, I crafted a presale contract using Solidity, ensuring a smooth and reliable token acquisition process for early investors. The project successfully delivered a fully functional ICO website, streamlined token purchase processes, and facilitated a successful presale campaign.

Solana and Bitcoin Bridge

We have created a blockchain bridge allowing the transfer of BRC20 tokens between the Bitcoin (BTC) blockchain and the Solana blockchain like Sobit bridge. It includes a BTC wallet for token lock/release, a Solana smart contract for minting/burning tokens, and a Node.js Application For Cross-chain communication. We integrated Unisat wallet and Phantom wallet. We made a solana token smart contract as we need to perform token minting and burning corresponding to BTC transactions.

Dex by forking Camelot Dex, Uniswap, Pancakeswap

Dex is one of the most important projects in the blockchain industry because it enables users to buy and sell any tokens easily without centralized control. There are several excellent Dex platforms, such as Uniswap, PancakeSwap, and Camelot Dex. The client needed to provide the UI design and project vision. I then implemented features like Swap, Liquidity, V2 and V3, Staking, LP Staking, Launchpad, and more