I build and audit smart contracts and I know exactly where they break.
Most developers write contracts. Most security researchers find bugs. I do both, which means I can ship Web3 products that are secure from day one not after an exploit drains your protocol.
What I do:
Smart contract development (ERC20, ERC721, DeFi, staking, DAOs) on Ethereum, BSC, and EVM-compatible chains
Smart contract security audits reentrancy, access control, integer overflow, flash loan attacks, and more
Full-stack Web3 dApps (frontend + Solidity + backend APIs)
Penetration testing for Web3 projects and backend systems
My stack: Solidity · Hardhat · Foundry · Python · Node.js · React · Web3.js · Ethers.js
I've worked on Cardano NFT projects (SpaceBudz, CNFT ecosystems), DeFi tools, and automation bots. I write clean, gas-optimized code and deliver detailed audit reports with proof-of-concept exploits and fixes not just a list of warnings.
If you're launching a protocol, token, or dApp and need it done right and done securely, let's talk.
Solidity
Blockchain
Blockchain Development
Back-End Development
API Testing
Penetration Testing
Smart Contract Development
web3.js
Hardhat
DeFi
Python
Femi A.
Lagos, Nigeria
$25/hr
5.0
4 jobs
I build decentralized applications that work. If you need a DeFi protocol, token launch platform, or blockchain fork deployed quickly and securely, I can deliver.
Recent Projects:
✅ Aave lending protocol clone (full-stack DeFi)
✅ PancakeSwap DEX fork with custom tokenomics
✅ Pinksale launchpad implementation
✅ DEX aggregator with real-time data visualization
What You Get:
• Clean, auditable smart contracts (Solidity/Rust)
• Full-stack web3 integration (React/Next.js + Web3.js/Ethers.js)
• API integration for on-chain/off-chain data
• End-to-end project management from brief to deployment
• Regular updates – I communicate daily via your preferred channel
Tech Stack:
Backend: Node.js, NestJS, Express, PostgreSQL, MongoDB
Frontend: React, Next.js, TypeScript, Tailwind, Material-UI
Blockchain: Solidity, Hardhat, Ethers.js, Web3.js
Mobile: React Native, Swift, Android Native
Let's build something secure and scalable. Message me with your project details.
Solidity
Blockchain
Web Application
JavaScript
React
Node.js
Web Development
RESTful API
Cryptocurrency
Computer Engineering
Web3
Front-End Development
Computer
NFT Marketplace
NFT Minting
Michael S.
Ado-Ekiti, Nigeria
$30/hr
5.0
1 jobs
🔴 WARNING: This is NOT a typical AI-generated Web3 / Blockchain Developer profile - so no need to skip.
✅ Blockchain Made Simple — No Buzzwords, Just Secure & Scalable Solutions
✅ Reliable Solidity & EVM-Based Smart Contract Developer
✅ No Missed Deadlines — Transparent Updates Every Step of the Way
With over 5 years of hands-on full-stack development experience and a strong focus on Blockchain & Web3 technologies, I help startups, founders, and businesses build secure smart contracts, decentralized applications (DApps), and blockchain-powered platforms that are production-ready and scalable.
Your project complexity becomes my responsibility. You can count on me to deliver clean code, secure contracts, and reliable Web3 solutions, whether you’re building a DeFi product, NFT platform, or a Web3 MVP.
✅ 𝗪𝗵𝗮𝘁 𝗜 𝗖𝗮𝗻 𝗗𝗼 𝗳𝗼𝗿 𝗬𝗼𝘂 :
📍 𝑩𝒍𝒐𝒄𝒌𝒄𝒉𝒂𝒊𝒏 & 𝑺𝒎𝒂𝒓𝒕 𝑪𝒐𝒏𝒕𝒓𝒂𝒄𝒕 𝑺𝒌𝒊𝒍𝒍𝒔:
🔹 Solidity (EVM-compatible blockchains)
🔹 Smart contract architecture & development
🔹 DeFi protocols (staking, liquidity, token logic)
🔹 NFT standards (ERC-721, ERC-1155)
🔹 Secure contract deployment & interaction
📍 𝑾𝒆𝒃3 & 𝑫𝑨𝒑𝒑 𝑫𝒆𝒗𝒆𝒍𝒐𝒑𝒎𝒆𝒏𝒕:
🔹 DApp development (Frontend + Smart Contracts)
🔹 Web3.js / Ethers.js integration
🔹 Wallet integration (MetaMask, WalletConnect)
🔹 Token-based authentication & transactions
📍 𝑭𝒓𝒐𝒏𝒕𝒆𝒏𝒅 𝑺𝒌𝒊𝒍𝒍𝒔:
🔹 HTML5, CSS3, JavaScript
🔹 React.js, Next.js, TypeScript
🔹 Tailwind CSS, Bootstrap
📍 𝑪𝒐𝒎𝒑𝒐𝒏𝒆𝒏𝒕 𝑳𝒊𝒃𝒓𝒂𝒓𝒊𝒆𝒔:
🔹 Mantine UI, Material UI, Chakra UI, ShadCN
🔹 Tailwind UI, Chart.js, D3.js
📍 𝑩𝒂𝒄𝒌𝒆𝒏𝒅 𝑺𝒌𝒊𝒍𝒍𝒔:
🔹 Node.js, Express.js, GraphQL
🔹 MongoDB, PostgreSQL, MySQL, Supabase
📍 𝑻𝒆𝒔𝒕𝒊𝒏𝒈 𝑻𝒐𝒐𝒍𝒔:
🔹 Smart contract & unit testing
🔹 Jest
📍 𝑼𝑰/𝑼𝑿 𝑻𝒐𝒐𝒍𝒔:
🔹 Figma (design-to-code workflow)
📍 𝑪𝒍𝒐𝒖𝒅 & 𝑫𝒆𝒗𝑶𝒑𝒔:
🔹 AWS (EC2, S3, Lambda, DynamoDB)
🔹 Docker, GitHub, GitLab, Vercel
✅ 𝗪𝗵𝗮𝘁 𝗜 𝗖𝗮𝗻 𝗛𝗲𝗹𝗽 𝗬𝗼𝘂 𝗪𝗶𝘁𝗵:
𝚆𝚎𝚋3 & 𝙱𝚕𝚘𝚌𝚔𝚌𝚑𝚊𝚒𝚗 𝚂𝚘𝚕𝚞𝚝𝚒𝚘𝚗𝚜 𝙸 𝙱𝚞𝚒𝚕𝚍:
🔅 DeFi platforms & protocols
🔅 NFT minting & marketplaces
🔅 Token-based applications
🔅 Blockchain-powered MVPs
🔅 Web3 SaaS platforms
𝚆𝚎𝚋 𝙰𝚙𝚙𝚕𝚒𝚌𝚊𝚝𝚒𝚘𝚗𝚜 (𝙵𝚛𝚘𝚗𝚝𝚎𝚗𝚍 & 𝙱𝚊𝚌𝚔𝚎𝚗𝚍):
🔅 Custom Web3 applications
🔅 Secure admin dashboards
🔅 API & blockchain integrations
🔅 MVP development with long-term support
Imagine your Web3 project working securely and at scale. Now, let’s make that a reality.
𝙎𝙚𝙣𝙙 𝙢𝙚 𝙖 𝙢𝙚𝙨𝙨𝙖𝙜𝙚 ➤ 𝙊𝙧 𝙄𝙣𝙫𝙞𝙩𝙚 𝙢𝙚 𝙩𝙤 𝙩𝙝𝙚 𝙟𝙤𝙗 ➤ 𝙄’𝙡𝙡 𝙧𝙚𝙨𝙥𝙤𝙣𝙙 𝙞𝙣 ❷ 𝙢𝙞𝙣𝙪𝙩𝙚𝙨
Solidity
Blockchain
Blockchain Architecture
Blockchain Development
Smart Contract
NFT
Smart Contract Development
web3.js
Node.js
Blockchain Tokenization
Blockchain Security
DeFi
Utility Token
React
Ecommerce Website Development
Olusola A.
Ifo, Nigeria
$35/hr
4.9
102 jobs
Full Stack Blockchain Developer | Ethereum | Solidity | Rust | Solana | EVM | Web3.js | Anchor | Next.js | NFT | Trading Bot
Looking for a secure, gas-optimized smart contract or a high-performance Solana program? I help Web3 founders, startups, and technology companies build production-ready blockchain applications across Ethereum, Solana, and EVM-compatible networks.
From smart contract architecture and DApp development to testing and mainnet deployment, I build decentralized applications focused on security, scalability, reliability, optimized gas usage, and real-world usability.
My expertise includes Solidity smart contracts, Rust/Solana programs, EVM development, Web3.js integrations, NFT, Anchor Framework, Next.js DApps, token development, DeFi applications, and blockchain integrations.
I specialize in developing reliable blockchain products — not just prototypes. Whether you need a custom smart contract, DeFi platform, Web3 application, token ecosystem, or complete decentralized infrastructure, I help transform ideas into functional products ready for users and market growth.
My approach combines technical expertise with scalable architecture to deliver efficient, maintainable, and future-ready blockchain solutions.
My experience covers Ethereum, EVM-compatible networks, Solana, and modern Web3 technologies, enabling me to build solutions tailored to different blockchain ecosystems.
My Blockchain Development Services::
✅ Smart Contract Development:
Solidity smart contracts.
ERC-20, ERC-721, ERC-1155 token development.
Token creation and deployment.
Staking, vesting, governance, and reward systems.
Smart contract testing, optimization, and security improvements.
Contract verification and mainnet deployment.
✅ Ethereum & EVM Development:
Ethereum blockchain development.
EVM-compatible networks (Polygon, BNB Chain, Arbitrum, Optimism, Base).
Solidity development.
Web3 integrations.
Layer 2 blockchain solutions.
Wallet and blockchain infrastructure integration.
✅ Web3 DApp Development:
Full-stack decentralized applications.
React.js / Next.js Web3 applications.
Node.js backend development.
Web3.js and Ethers.js integration.
MetaMask, WalletConnect, and Phantom wallet integration.
User dashboards, admin panels, and blockchain-powered platforms.
✅ DeFi Development:
Decentralized exchanges (DEX).
AMM protocols.
Liquidity systems.
Staking platform.
Yield farming applications.
DAO and governance systems.
DeFi MVP development.
✅ Solana Development
Solana token development.
SPL token creation.
Solana ecosystem integration.
Phantom wallet integration.
Rust-based blockchain solutions.
Blockchain MVP Development:
I help founders move from concept to a working blockchain MVP ready for testing, investors, and market launch.
Services include:
Blockchain product architecture.
Smart contract MVP development.
Token-based platforms.
Web3 startup solutions.
Prototype-to-mainnet development.
Scalable blockchain infrastructure.
My Technologies:
Blockchain:
Ethereum | EVM | Solana | Polygon | BNB Chain | Arbitrum | Optimism | Base.
Smart Contracts:
Solidity | Rust | ERC Standards | SPL Tokens | OpenZeppelin.
Web3:
Web3.js | Ethers.js | WalletConnect | MetaMask | Phantom.
Frontend & Backend:
React.js | Next.js | Node.js | APIs | Blockchain Integrations.
Why Clients Choose Me:
Specialized Blockchain Developer focused on Ethereum, EVM, Web3, and DeFi.
Experience building production-ready blockchain solutions.
Strong understanding of smart contracts and decentralized applications.
Security-focused development approach.
Clear communication and reliable delivery.
Focused on creating scalable products that can grow beyond MVP stage.
If you are building a Web3 startup, launching a blockchain product, developing a DeFi platform, or need an experienced Ethereum/EVM developer, I can help you build and deploy your solution.
Let’s discuss your blockchain project and turn your idea into a working product.
Solidity
Blockchain
Blockchain Architecture
Blockchain Development
Ethereum
Smart Contract
Cryptocurrency
Smart Contract Development
Blockchain Platform
Crypto Marketing
ICO Marketing
ReddCoin
Blockchain, NFT & Cryptocurrency
JavaScript
Node.js
web3.js
Blockchain Development Framework
PHP
API
React
AbdulHamid O.
Ilorin, Nigeria
$10/hr
5.0
3 jobs
Experienced Web3 Software Engineer specializing in smart contract development and security auditing. I combine deep technical expertise with a mission-driven approach to deliver secure, gas-optimized blockchain solutions.
Core Expertise:
- Smart Contract Development & Security Auditing
- DeFi Protocol Testing & Implementation
- Blockchain Integration & Frontend Development
Technical Skills:
- Token Standards: ERC20, ERC721, ERC1155, ERC6551, ERC777, ERC4337, EIP712, etc
- Smart Contract Patterns: UUPS, Beacon proxy, transparent proxy
- Development Tools: Hardhat, Foundry, Ethers.js, Web3.py, Viem
- Testing: Unit testing, integration testing, fuzzing, Echinda, formal verification
Notable Projects:
- Monadex (WIP): Co-founder and Solidity developer building a custom DEX and gamified experience on Monad L1
- Sabre DAO: Decentralized VC platform (6th place in LW3 hackathon)
- PayStream: Peer-to-peer money streaming platform integrated with PayPal stablecoin
- DTesla: On-chain Tesla stock tokenization using Chainlink oracles and Alpaca
Security Expertise:
- Completed major security CTFs: Ethernaut, Capture the Ether, Damn Vulnerable DeFi
- Specialized in gas optimization and secure smart contract development
- Expert in smart contract testing and vulnerability assessment
Education & Certifications:
- Bachelor's Degree in Mechanical Engineering, University of Ilorin
- Cyfrin Updraft: Solidity 101, Foundry 101, Advanced Foundry
- Patrick Collins' Full Hardhat Course
Solidity
Blockchain
Ethereum
Web3
NFT
Dominion O.
Ibadan, Nigeria
$25/hr
5.0
1 jobs
Hi there, I’m a full-stack blockchain developer. I build smart contracts, dApps, and DeFi apps that are secure, clear, and ready for real use. I can handle the full stack - frontend and backend, and also on-chain logic so you don’t need separate developers.
🔹 What I Do:
Smart Contracts
- ERC20, BEP20, and SPL tokens (mint/burn, ICO/IDO, reflections)
- NFTs (ERC721/1155) with royalties, presales, auctions, IPFS, and metadata
- dApps like crowdfunding, marketplaces, lotteries, and airdrops
Full-Stack Development
- Frontend: React, Next.js, TypeScript
- Backend: Node.js, Python, Hardhat, Foundry
- Smart contracts: Solidity (Ethereum, BSC), Rust (Solana, Near), Motoko (ICP), Tezos, zkSync
- Integrations: Uniswap, PancakeSwap, Aave, Raydium, bridges, and rollups
Custom Scripts
- Swap bots, liquidity tools, automation for DeFi protocols
🔹 Why Work With Me
- Security first — audit-ready and resistant to exploits
- Gas-efficient — optimized code to save deployment and transaction costs
- Multi-chain — Ethereum, Solana, Tezos, zkSync, TON, Injective, and more
- End-to-end — frontend, backend, and contracts handled in one place
- Clear communication and reliable support after launch
Solidity
DApp Development
Blockchain Architecture
Blockchain Development
Ethereum
Smart Contract
Rust
Sui
React
Next.js
Blockchain, NFT & Cryptocurrency
Hardhat
DeFi
Ethers.js
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