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Check out Blockchain developers with the skills you need for your next job.
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Rating is 4.7 out of 5.
4.7/5
based on 3,380 client reviews
  • $100 hourly
    • 5.0/5
    • (19 jobs)
    I've been building unique software solutions since 2020. I love building new projects from the ground up and contributing to existing projects that make a difference in the world. I believe in quality solutions, good communication, and test driven development. 𝗦𝗼𝗹𝘂𝘁𝗶𝗼𝗻𝘀 𝗜 𝗖𝗮𝗻 𝗣𝗿𝗼𝘃𝗶𝗱𝗲 - 𝙎𝙢𝙖𝙧𝙩 𝘾𝙤𝙣𝙩𝙧𝙖𝙘𝙩𝙨: I can provide smart contracts for ERC20/ERC721 tokens, NFT Marketplaces, Physical Goods Marketplaces, and Databases that use a combination of Solidity and IPFS for a truly decentralized backend - 𝘾𝙧𝙮𝙥𝙩𝙤 𝙒𝙖𝙡𝙡𝙚𝙩𝙨: I can build crypto wallets that take a simple seed phrase and turn it into blockchain address with full payment functionality - 𝘽𝙡𝙤𝙘𝙠𝙘𝙝𝙖𝙞𝙣 𝙏𝙧𝙖𝙘𝙠𝙞𝙣𝙜 𝙖𝙣𝙙 𝘼𝙣𝙖𝙡𝙮𝙨𝙞𝙨: I love tracking addresses and parsing through blockchain history to provide real answers to complicated questions - 𝘼𝙪𝙩𝙤𝙢𝙖𝙩𝙚𝙙 𝘿𝙖𝙩𝙖 𝙍𝙚𝙥𝙤𝙧𝙩𝙞𝙣𝙜: I can build software that automatically takes your raw data and turns it into a human readable spreadsheet... I can even have a bot deliver your spreadsheet for you! - 𝙒𝙚𝙗 𝙎𝙘𝙧𝙖𝙥𝙞𝙣𝙜: Extract valuable data in an efficient manner - 𝙏𝙚𝙘𝙝𝙣𝙞𝙘𝙖𝙡 𝘼𝙧𝙩𝙞𝙘𝙡𝙚𝙨/𝘿𝙤𝙘𝙪𝙢𝙚𝙣𝙩𝙖𝙩𝙞𝙤𝙣: How-To Guides and Software Docs (with code examples) in pretty much any format you could ever want - 𝙏𝙧𝙖𝙙𝙞𝙣𝙜 𝘽𝙤𝙩𝙨: Turn your manual trading strategy into an automated powerhouse! - 𝙁𝙪𝙡𝙡 𝙎𝙩𝙖𝙘𝙠 𝙎𝙤𝙡𝙪𝙩𝙞𝙤𝙣𝙨: I can give your app a custom frontend using JavaScript/React, HTML and CSS - 𝘾𝙪𝙨𝙩𝙤𝙢 𝙎𝙤𝙡𝙪𝙩𝙞𝙤𝙣𝙨: Need something that's not listed above? Send me a message and we'll talk! 𝗪𝗵𝘆 𝗖𝗵𝗼𝗼𝘀𝗲 𝗠𝗲 - 𝘾𝙪𝙨𝙩𝙤𝙢 𝙎𝙤𝙛𝙩𝙬𝙖𝙧𝙚: You have a unique problem and it requires a unique solution - 𝙌𝙪𝙖𝙡𝙞𝙩𝙮: You care about the quality of your project or product and you want things handled with proper time and care - 𝙏𝙚𝙨𝙩 𝘿𝙧𝙞𝙫𝙚𝙣 𝘿𝙚𝙫𝙚𝙡𝙤𝙥𝙢𝙚𝙣𝙩: You believe that software products should be properly planned and tested before hitting production - 𝙋𝙚𝙧𝙨𝙞𝙨𝙩𝙚𝙣𝙘𝙚: You want someone who attacks a problem from every angle and does not believe in the phrase, "It can't be done" 𝗠𝘆 𝗧𝗲𝗰𝗵 𝗦𝘁𝗮𝗰𝗸 - Python - Rust - JavaScript - Julia - C++ - Solidity Take a look at some of my reviews below to see what other clients have said!
    Featured Skill Blockchain
    Solidity
    Ethereum
    Bitcoin
    Data Extraction
    Julia
    Writing
    Content Creation
    Software Documentation
    JavaScript
    React
    C++
    HTTP
    Rust
    Python
  • $50 hourly
    • 5.0/5
    • (18 jobs)
    Blockchain developer since 2020. - Smart Contracts writing and testing. - Descentralized Applications. - NFTs and Marketplaces. - Tokens. - Web3 integration. - APIs - Solidity - Web3, Ethers - Hardhat, Truffle, - JavaScript - React - NodeJs - Ethereum and EVM Blockchains. - ERC721, ERC1155, ERC20 Blockchain is evolving really fast, so I'm working, learning and improving everyday to stay up to date. If I don't know the answer to a problem, I will dive into the documentation and come back with a solution. Let's discuss your project and start working together.
    Featured Skill Blockchain
    Blockchain Development
    Blockchain Architecture
    React
    Twitter/X API
    API Integration
    Node.js
    TypeScript
    PostgreSQL
    Solana
    Discord Bot Development
    AI Agent Development
    AI Bot
    Next.js
    web3.js
    Solidity
    Smart Contract
    DApps
  • $130 hourly
    • 5.0/5
    • (11 jobs)
    Extensive expertise, and experience in taking idea to a deliverable product / MVP. Primarily from my experience being the technical lead at a small size venture funded start up I've had the chance to First, explore a wide variety of languages, frameworks, and technologies allowing me to have a full conceptual overview of the tools at my disposal, and their respective benefits + pitfalls, and second have the experience working with, and managing a small distributed team closely with the CEO.
    Featured Skill Blockchain
    Solidity
    Smart Contract
    Web Scraping
    Node.js
    React
    Golang
    Vue.js
    GPT-3
    Rust
    Next.js
    GPT-4
    ChatGPT
    Web Development
    CSS
  • $150 hourly
    • 5.0/5
    • (294 jobs)
    I am a cybersecurity professional with a Master's Degree in Cyber Operations and two years of work experience in cybersecurity research and development at a world-class R&D laboratory. In that job, I gained experience in network traffic analysis, malware analysis, and cryptography. For the past seven years, I have worked as a freelancer, providing content development, course creation, and consulting in cybersecurity and blockchain security. I specialize in development of technical content (blogs, whitepapers, case studies, and courseware) in the field of cybersecurity. I currently hold the Certified Ethical Hacker and Certified Blockchain Security Professional certifications.
    Featured Skill Blockchain
    Reverse Engineering
    Cryptocurrency
    Cryptography
    Information Security
  • $40 hourly
    • 4.8/5
    • (46 jobs)
    I have over 10 years of experience in Full Stack Development, Project Management, and Leading Teams, I bring a wealth of skills to develop efficient and scalable applications according to your needs. Here’s what I offer: Frontend Expertise: - 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁 & 𝗧𝘆𝗽𝗲𝗦𝗰𝗿𝗶𝗽𝘁 - 𝗥𝗲𝗮𝗰𝘁.𝗷𝘀 & 𝗔𝗻𝗴𝘂𝗹𝗮𝗿 - 𝗥𝗲𝗮𝗰𝘁 𝗡𝗮𝘁𝗶𝘃𝗲 - 𝗛𝗧𝗠𝗟𝟱, 𝗖𝗦𝗦𝟯 & 𝗦𝘁𝘆𝗹𝗶𝗻𝗴 𝗙𝗿𝗮𝗺𝗲𝘄𝗼𝗿𝗸𝘀 Backend Development: - 𝗡𝗼𝗱𝗲.𝗷𝘀 & 𝗘𝘅𝗽𝗿𝗲𝘀𝘀.𝗷𝘀 - 𝗣𝘆𝘁𝗵𝗼𝗻/𝗗𝗷𝗮𝗻𝗴𝗼 & 𝗙𝗹𝗮𝘀𝗸 - 𝗣𝗛𝗣/𝗟𝗮𝗿𝗮𝘃𝗲𝗹 Database Management: - 𝗠𝘆𝗦𝗤𝗟, 𝗣𝗼𝘀𝘁𝗴𝗿𝗲𝗦𝗤𝗟, 𝗠𝗼𝗻𝗴𝗼𝗗𝗕 - 𝗥𝗲𝗱𝗶𝘀 APIs & Real-Time Features: - 𝗥𝗘𝗦𝗧𝗳𝘂𝗹 𝗔𝗣𝗜 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 - 𝗪𝗲𝗯𝗦𝗼𝗰𝗸𝗲𝘁𝘀 Development Practices: - 𝗔𝗴𝗶𝗹𝗲 𝗠𝗲𝘁𝗵𝗼𝗱𝗼𝗹𝗼𝗴𝘆 & 𝗦𝗰𝗿𝘂𝗺: Ensuring efficient project management and timely delivery. - 𝗨𝗻𝗶𝘁 𝗧𝗲𝘀𝘁𝗶𝗻𝗴: Using Jest and Mocha to ensure code quality and reliability. - 𝗩𝗲𝗿𝘀𝗶𝗼𝗻 𝗖𝗼𝗻𝘁𝗿𝗼𝗹: Proficient with Git, GitHub, and GitLab for effective code management. DevOps & Cloud Services: - 𝗔𝗪𝗦 𝗖𝗲𝗿𝘁𝗶𝗳𝗶𝗲𝗱 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 - 𝗗𝗼𝗰𝗸𝗲𝗿 & 𝗞𝘂𝗯𝗲𝗿𝗻𝗲𝘁𝗲𝘀 - 𝗖𝗜/𝗖𝗗 𝗣𝗶𝗽𝗲𝗹𝗶𝗻𝗲𝘀 - 𝗡𝗴𝗶𝗻𝘅 & 𝗔𝗽𝗮𝗰𝗵𝗲 Whether you need a frontend, a backend, or a full-stack, I bring the skills and dedication to turn your ideas into reality.
    Featured Skill Blockchain
    CRM Software
    Progressive Web App
    Next.js
    Django
    MEAN Stack
    MERN Stack
    Web Application
    Mobile App
    Laravel
    Python
    React
    Android App Development
    React Native
    JavaScript
    PHP
  • $25 hourly
    • 4.7/5
    • (16 jobs)
    𝐇𝐞𝐥𝐥𝐨 𝐄𝐯𝐞𝐫𝐲𝐨𝐧𝐞👋 𝐀 𝐡𝐢𝐠𝐡𝐥𝐲 𝐬𝐤𝐢𝐥𝐥𝐞𝐝 𝐚𝐧𝐝 𝐞𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞𝐝 𝐟𝐮𝐥𝐥 𝐬𝐭𝐚𝐜𝐤 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 𝐰𝐢𝐭𝐡 𝐨𝐯𝐞𝐫 𝟓 𝐲𝐞𝐚𝐫𝐬 𝐨𝐟 𝐞𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞 𝐢𝐧 𝐰𝐞𝐛 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭. 𝐏𝐫𝐨𝐟𝐢𝐜𝐢𝐞𝐧𝐭 𝐢𝐧 𝐛𝐨𝐭𝐡 𝐟𝐫𝐨𝐧𝐭-𝐞𝐧𝐝 𝐚𝐧𝐝 𝐛𝐚𝐜𝐤-𝐞𝐧𝐝 𝐭𝐞𝐜𝐡𝐧𝐨𝐥𝐨𝐠𝐢𝐞𝐬, 𝐰𝐢𝐭𝐡 𝐚 𝐬𝐭𝐫𝐨𝐧𝐠 𝐟𝐨𝐜𝐮𝐬 𝐨𝐧 𝐜𝐫𝐞𝐚𝐭𝐢𝐧𝐠 𝐬𝐜𝐚𝐥𝐚𝐛𝐥𝐞 𝐚𝐧𝐝 𝐦𝐚𝐢𝐧𝐭𝐚𝐢𝐧𝐚𝐛𝐥𝐞 𝐚𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬. 𝐒𝐤𝐢𝐥𝐥𝐞𝐝 𝐢𝐧 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐢𝐧𝐠 𝐫𝐞𝐬𝐩𝐨𝐧𝐬𝐢𝐯𝐞 𝐮𝐬𝐞𝐫 𝐢𝐧𝐭𝐞𝐫𝐟𝐚𝐜𝐞𝐬 𝐮𝐬𝐢𝐧𝐠 𝐩𝐨𝐩𝐮𝐥𝐚𝐫 𝐟𝐫𝐚𝐦𝐞𝐰𝐨𝐫𝐤𝐬 𝐥𝐢𝐤𝐞 𝐑𝐞𝐚𝐜𝐭 𝐚𝐧𝐝 𝐕𝐮𝐞, 𝐚𝐬 𝐰𝐞𝐥𝐥 𝐚𝐬 𝐛𝐮𝐢𝐥𝐝𝐢𝐧𝐠 𝐫𝐨𝐛𝐮𝐬𝐭 𝐬𝐞𝐫𝐯𝐞𝐫-𝐬𝐢𝐝𝐞 𝐚𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬 𝐰𝐢𝐭𝐡 𝐍𝐨𝐝𝐞.𝐣𝐬 𝐚𝐧𝐝 𝐋𝐚𝐫𝐚𝐯𝐞𝐥. 𝐏𝐫𝐨𝐯𝐞𝐧 𝐚𝐛𝐢𝐥𝐢𝐭𝐲 𝐭𝐨 𝐥𝐞𝐚𝐝 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 𝐭𝐞𝐚𝐦𝐬, 𝐦𝐚𝐧𝐚𝐠𝐞 𝐩𝐫𝐨𝐣𝐞𝐜𝐭𝐬, 𝐚𝐧𝐝 𝐝𝐞𝐥𝐢𝐯𝐞𝐫 𝐡𝐢𝐠𝐡-𝐪𝐮𝐚𝐥𝐢𝐭𝐲 𝐜𝐨𝐝𝐞 𝐮𝐧𝐝𝐞𝐫 𝐭𝐢𝐠𝐡𝐭 𝐝𝐞𝐚𝐝𝐥𝐢𝐧𝐞𝐬. 𝐌𝐲 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞: ✅Frontend - JavaScript, React, Redux, Vue.js, Type Script Next.js. ✅Backend - Python/Django, Nest.js, Node.js, Express.js, Spring Boot, and Laravel ✅Database - MySQL, PostgreSQL, and NoSQL (MongoDB), Firebase, Redis, Cassandra, and Oracle. ✅Version Control - Git. ✅Cloud Deployment - Azure, AWS, Google Cloud and IBM Cloud. ✅Laravel, PHP, Yii, WordPress Plugins Development, etc. ✅Docker & Vagrant. ✅Git, GitHub, & Bitbucket. ✅Strong HTML, CSS, JavaScript, TypeScript, jQuery, & Bootstrap. ✅Digital Ocean, Heroku, Netlify, Firebase, & Rackspace. 𝐎𝐭𝐡𝐞𝐫𝐬 𝐒𝐞𝐫𝐯𝐞𝐫𝐥𝐞𝐬𝐬 (𝐥𝐚𝐦𝐛𝐝𝐚) 𝐋𝐈𝐌𝐒 (𝐥𝐚𝐛𝐨𝐫𝐚𝐭𝐨𝐫𝐲 𝐈𝐧𝐟𝐨𝐫𝐦𝐚𝐭𝐢𝐨𝐧 𝐌𝐚𝐧𝐚𝐠𝐞𝐦𝐞𝐧𝐭 𝐒𝐲𝐬𝐭𝐞𝐦) ✔Socket.io ✔Kaafka ✔Fedex integration ✔Auth0 ✔Okta 🚀𝐅𝐞𝐞𝐥 𝐟𝐫𝐞𝐞 𝐭𝐨 𝐝𝐫𝐨𝐩 𝐦𝐞 𝐚 𝐦𝐞𝐬𝐬𝐚𝐠𝐞 𝐟𝐨𝐫 𝐩𝐫𝐨𝐣𝐞𝐜𝐭 𝐪𝐮𝐨𝐭𝐞𝐬 𝐨𝐫 𝐛𝐫𝐚𝐢𝐧𝐬𝐭𝐨𝐫𝐦𝐢𝐧𝐠 𝐝𝐢𝐬𝐜𝐮𝐬𝐬𝐢𝐨𝐧𝐬. 𝐘𝐨𝐮 𝐜𝐚𝐧 𝐚𝐥𝐬𝐨 𝐞𝐱𝐩𝐥𝐨𝐫𝐞 𝐦𝐲 𝐔𝐩𝐰𝐨𝐫𝐤 𝐩𝐨𝐫𝐭𝐟𝐨𝐥𝐢𝐨, 𝐬𝐡𝐨𝐰𝐜𝐚𝐬𝐢𝐧𝐠 𝐦𝐲 𝐝𝐞𝐝𝐢𝐜𝐚𝐭𝐢𝐨𝐧 𝐭𝐨 𝐡𝐢𝐠𝐡-𝐪𝐮𝐚𝐥𝐢𝐭𝐲 𝐰𝐨𝐫𝐤. 𝐓𝐡𝐚𝐧𝐤 𝐲𝐨𝐮 𝐟𝐨𝐫 𝐭𝐚𝐤𝐢𝐧𝐠 𝐭𝐡𝐞 𝐭𝐢𝐦𝐞, 𝐚𝐧𝐝 𝐈 𝐚𝐦 𝐥𝐨𝐨𝐤𝐢𝐧𝐠 𝐟𝐨𝐫𝐰𝐚𝐫𝐝 𝐭𝐨 𝐜𝐨𝐧𝐧𝐞𝐜𝐭𝐢𝐧𝐠 𝐰𝐢𝐭𝐡 𝐲𝐨𝐮 𝐬𝐨𝐨𝐧!
    Featured Skill Blockchain
    React Native
    PSD to HTML
    MERN Stack
    WordPress
    API Integration
    API
    Flask
    Web Development
    Front-End Development
    React
    Smart Contract
    Node.js
    web3.js
    Solidity
    JavaScript
  • $80 hourly
    • 5.0/5
    • (41 jobs)
    I have been an IT engineer for more than 12 years, including the Backend part, Database optimization, Server setup, WEB3, DevOps, custom blockchain development, and API of other Services. Have experience in developing projects from the very start in JavaScript, Golang, Rust, C++, Dart, Erlang, and Solidity. I am highly responsible for my work, punctual, and attentive to little details. I like complex tasks to do and finding nonlinear decisions. I was part of a team of such big projects as: - Elrond (EGLD) : Launch of IEO, development of a sharding system; - Crypto wallet Bread (BRD) : Development and audit of payment gateways; - CoinPayments : Development of payment gateways and storage of cryptocurrency funds. By working with me, you can be sure of the stable functioning of your application. Listed below are my experience and skills. – JavaScript (ReactJS, NodeJS, ECMAScript); – WebAssembly; – C++; – Rust; – Solidity; – Erlang; – Dart; – Golang. – GraphQL; – PostgreSQL; – LevelDB; – RocksDB. – PlayCanvas; – WebXR. – Blockchain Protocols; – Copy trading protocols and architecture; – Smart Contract Audit; – Exchange development (CEX); – Decentralized exchange development (DEX); – Arbitrage and Trading bots development; – ICO/IDO/IBCO/LBP/IFO; – Flash loans bots; – Front-running, snipe, and sandwich bots; – Wallet (flutter) development configuration; – TradingView configuration; – Meta; – Metaverse; – DeFi; – NFT; – GameFi. I've worked with the following services: – AWS (EC2, ELB, ASG, RDS, ElastiCache, S3); – AWS Serverless Fundamentals (Lambda, DynamoDB, Cognito, API Gateway); – Monitor, Trace and Audit your microservices using CloudWatch, X-Ray, and CloudTrail; – Linux, AWS, Bash & Python Scripting, Jenkins, Ansible, Docker, Kubernetes, Cloudformation, Terraform; – Sentry; – Pingdom; – Supervisor; – uWSGI; – Vagrant; – Git, CLI; – Ansible; – Apache; – Datadog; – Docker, Docker Compose; – Gunicorn; – Nginx. – CCXT; – OpenDAX; – OpenZeppelin Truffle; – MetaMask; – Ganache; – Remix IDE; – Geth; – Parity; – Web3.js – Ethers.js; – Infura; – Embark; – Brownie; – Alchemy; – Drizzle. – Bitcoin; – Lightning Network; – Ethereum Smart Contracts(ERC-20, ERC-721, ERC-223, ERC-777, ERC-1155, ERC-1337, ERC-3643 (ex-T-REX) and the ERC-1400); – Binance Smart Chain (BNB); – Cardano (ADA); – Solana (SOL); – Avalanche (AVAX); – Terra (LUNA); – Polkadot (DOT); – Polygon (MATIC); – Cosmos (ATOM); – Chainlink (LINK); – NEAR Protocol (NEAR); – Uniswap (UNI); – TRON (TRX); – Decentraland (MANA); – PancakeSwap (CAKE); – Toncoin (TON).
    Featured Skill Blockchain
    Ethereum
    web3.js
    Solidity
    Blockchain, NFT & Cryptocurrency
    Smart Contract
    Blockchain Development
    Bitcoin
    Web3
    Network Architecture
    Blockchain Architecture
    Golang
    React
    JavaScript
  • $100 hourly
    • 4.9/5
    • (121 jobs)
    𝐓𝐨𝐩 𝟏% 𝐁𝐥𝐨𝐜𝐤𝐜𝐡𝐚𝐢𝐧 𝐄𝐧𝐠𝐢𝐧𝐞𝐞𝐫 | 𝐓𝐫𝐚𝐧𝐬𝐟𝐨𝐫𝐦𝐢𝐧𝐠 𝐈𝐝𝐞𝐚𝐬 𝐢𝐧𝐭𝐨 𝐑𝐨𝐛𝐮𝐬𝐭, 𝐒𝐜𝐚𝐥𝐚𝐛𝐥𝐞 𝐒𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬 With over a decade of hands-on experience in blockchain development, I bring both the technical expertise and strategic insight to bring your project to life. As an Upwork expert-vetted engineer, I’ve partnered with clients to launch secure, scalable, and innovative blockchain applications across multiple ecosystems. 𝐖𝐡𝐲 𝐖𝐨𝐫𝐤 𝐖𝐢𝐭𝐡 𝐌𝐞? • 𝐄𝐧𝐝-𝐭𝐨-𝐄𝐧𝐝 𝐁𝐥𝐨𝐜𝐤𝐜𝐡𝐚𝐢𝐧 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞: I’m skilled in every layer of blockchain development, from designing smart contracts and DeFi protocols to launching complete dApps across EVM, Solana, Polkadot, and more. • 𝐒𝐭𝐫𝐚𝐭𝐞𝐠𝐢𝐜 𝐅𝐨𝐜𝐮𝐬 𝐨𝐧 𝐆𝐫𝐨𝐰𝐭𝐡: Every project I take on is designed not just to work, but to drive growth, security, and user engagement. With a unique blend of technical and business insight, I deliver blockchain solutions that meet and exceed real-world demands. • 𝐏𝐫𝐨𝐯𝐞𝐧 𝐒𝐮𝐜𝐜𝐞𝐬𝐬 𝐑𝐞𝐜𝐨𝐫𝐝: I’ve led numerous projects from ideation to launch, consistently achieving client objectives and ensuring scalability for future growth. 𝐓𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐒𝐤𝐢𝐥𝐥𝐬 & 𝐒𝐩𝐞𝐜𝐢𝐚𝐥𝐭𝐢𝐞𝐬 𝐁𝐥𝐨𝐜𝐤𝐜𝐡𝐚𝐢𝐧 & 𝐒𝐦𝐚𝐫𝐭 𝐂𝐨𝐧𝐭𝐫𝐚𝐜𝐭 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 • 𝐄𝐭𝐡𝐞𝐫𝐞𝐮𝐦 𝐄𝐜𝐨𝐬𝐲𝐬𝐭𝐞𝐦: Solidity, Vyper, ERC standards (ERC20, ERC721, ERC1155) • 𝐒𝐨𝐥𝐚𝐧𝐚 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: Rust, Anchor Framework • 𝐏𝐨𝐥𝐤𝐚𝐝𝐨𝐭 & 𝐍𝐞𝐚𝐫 𝐏𝐫𝐨𝐭𝐨𝐜𝐨𝐥: Rust, Ink! • 𝐂𝐚𝐫𝐝𝐚𝐧𝐨: Plutus (Haskell), Marlowe • 𝐇𝐲𝐩𝐞𝐫𝐥𝐞𝐝𝐠𝐞𝐫 (𝐏𝐞𝐫𝐦𝐢𝐬𝐬𝐢𝐨𝐧𝐞𝐝 𝐁𝐥𝐨𝐜𝐤𝐜𝐡𝐚𝐢𝐧): Go, JavaScript 𝐅𝐮𝐥𝐥-𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 • 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝: JavaScript, TypeScript, React, Next.js, Vue.js, TailwindCSS, Bootstrap • 𝐁𝐥𝐨𝐜𝐤𝐜𝐡𝐚𝐢𝐧 𝐋𝐢𝐛𝐫𝐚𝐫𝐢𝐞𝐬: Web3.js, Ethers.js, Solana Web3.js • 𝐁𝐚𝐜𝐤𝐞𝐧𝐝 & 𝐀𝐏𝐈: Node.js, Python, Go, Rust, C++, GraphQL, Express.js, Flask 𝐌𝐨𝐛𝐢𝐥𝐞 & 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞 𝐒𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬 • 𝐌𝐨𝐛𝐢𝐥𝐞: Kotlin/Java (Android), Swift (iOS), React Native • 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞𝐬 & 𝐒𝐭𝐨𝐫𝐚𝐠𝐞: PostgreSQL, MySQL, MongoDB, Prisma, IPFS 𝐈𝐧𝐝𝐮𝐬𝐭𝐫𝐢𝐞𝐬 𝐒𝐞𝐫𝐯𝐞𝐝 From DeFi and NFTs to enterprise solutions, I work across various industries, customizing each project to meet specific client needs and industry demands. Let’s discuss how we can leverage blockchain to make your vision a powerful reality. Whether it’s a new dApp, DeFi protocol, or enterprise-grade solution, I’m here to bring your ideas to life with technical excellence and strategic foresight.
    Featured Skill Blockchain
    Solana
    Front-End Development
    Next.js
    API Development
    Solidity
    Web Development
    Rust
    Cryptocurrency
    Smart Contract
    Blockchain, NFT & Cryptocurrency
    DApps
    Ethereum
    Blockchain Development
    React
  • $100 hourly
    • 4.8/5
    • (34 jobs)
    Thank you for stopping by! As a computer science graduate with a Gold Medal, I have a deep passion for learning and staying up to date with the latest trends and technologies in the industry. I am constantly evolving as a student of something new all the time. My expertise lies in developing full-stack Blockchain Solutions, Mobile and Web Applications, Cloud Solutions, and active participation in research work for core computer science subjects. Here are my key skills and experience: - Developing full-stack Blockchain Solutions: I can help you with core network setup, architecture design, business logic implementation, and front-end and application design. - Developing full-stack Mobile and Web Applications: I have experience with trending stacks such as MERN and I am always eager to learn more. - Cloud Solutions: I have helped clients build their application infrastructure on both Amazon Web Services and Google Cloud Platform, providing a complete solution from ground up. - Academia: I am actively participating in research work for core computer science subjects such as Networking, Distributed Computing, and Blockchain Computing. I have also taught lectures on Blockchain Computing for various age groups. With my expertise and experience, I offer crystal-clear communication, high availability, free consultations over calls, and a friendly attitude towards my clients. Let's work together and make your project a success!
    Featured Skill Blockchain
    Node.js
    Blockchain Architecture
    React
    TRON
    API Development
    API Integration
    JavaScript
    Smart Contract
    Mobile App Development
    Blockchain Development
    AWS Application
    Desktop Application
  • $75 hourly
    • 5.0/5
    • (21 jobs)
    Hey there, hope you are doing great. 👋 I am Saurabh Lodha and I would love to help you build your idea. Thought of trying a POC? - Reach out to me and with my customized template repositories, we can quickly put together an MVP. Have an idea and want to build and scale it to something big? - I have more than 4 years of professional development experience and have completed and contributed to some amazing projects along the way so I would love to work with you. Ever stuck in the hell of debugging or fixing something? - Reach out to me, I will always love to take a look and help you out. Want to get a consultation before building? - I have a great domain experience in Blockchain and Backend development and keep myself updated with the latest in the domain. EIPs, ERC20s, NFTs, Defi and Lending protocols, Layer2, etc. - I would be able to give you a great opinion on what you might want to try and also be able to build you an architecture for your product or a POC. - Besides having a solid understanding of the technical side of things, I love to contribute amazing ideas and always consider giving everything to the team and to the product so you could start something amazing with me onboard. In more details this is what I do to run my house - - I work on designing, developing, and testing smart contracts and have mainnet deployed contracts on multiple EVM chains. - I have a solid career in backend development and can design and develop backend services required for use cases like APIs for Dapps, Arbitrage bots for trading, monorepos, microservices, etc. - I have worked in the Defi space for the last 1.5 years and have designed DEXs, vault contracts, staking pools, and yield-bearing contracts and also contributed towards building on top of some of the biggest projects in this space. (Aave, QuickSwap, Ethalend, Dystopia). - I work on designing and developing subgraphs useful for data indexing. - I also audit Smart Contracts and work extensively on learning about Smart Contract security and vulnerabilities. - I have also developed Lottery Smart contracts, NFT Marketplaces, ERC1155 contracts, ICOs, vesting, and custom ERC20 smart contracts. - I have a good experience of website development and smart contract integration and have completed some cool React projects along the way. Combining all these, I make for a hard-working, innovative, punctual, and easy-to-work-with professional. I have good communication and leadership skills and have good experience working and shipping remotely. Having been in the Crypto space since 2019, I have the correct attitude required to build, excel and contribute in this space and love to work and build with the community. I would love to connect and discuss more, and I am always ready to give an interview about my technical skills and make a good presentation of my communication skills.
    Featured Skill Blockchain
    NestJS
    Cryptocurrency
    NFT Marketplace
    Ethereum
    Blockchain Development
    Initial Coin Offering
    Solidity
    web3.js
    JavaScript
    TypeScript
    Smart Contract
    Node.js
    Blockchain Architecture
  • $85 hourly
    • 5.0/5
    • (7 jobs)
    Full stack dev. Web3 friendly. Front-end - NextJS/Tailwind/GraphQL MERN - Mongo/Express/React/Node Web3 - Solidity/Viem/The Graph/Wagmi
    Featured Skill Blockchain
    Front-End Development
    GraphQL
    Tailwind CSS
    Next.js
    React
    React Native
    Web Development
    Web3
    Solidity
    web3.js
    Smart Contract
    Ethereum
    TypeScript
    JavaScript
  • $70 hourly
    • 5.0/5
    • (29 jobs)
    As a web developer with 9+ years of experience, I am proficient in a wide range of technologies and tools. My stack includes: Programming languages: PHP, Python, JavaScript, Node.js, HTML, CSS Frameworks and libraries: Laravel, Django, Vue.js, React, Angular CMS, e-commerce: WordPress, Shopify Databases: MySQL, MongoDB, PostgreSQL Operating systems: Linux, macOS Web servers: Apache, Nginx Version control: Git Testing and automation: Selenium Deployment and hosting: AWS, GCP, DigitalOcean In addition I am also experienced in web3 development, including the creation of trading bots and smart contracts. My web3 stack includes: Web3 libraries: Web3.js, ethers.js Blockchain platforms: Ethereum, EOS Programming languages: Solidity, Vyper I have over 8.5K hours of experience on Upwork and a strong track record of delivering high quality, responsive, and user-friendly solutions for my clients. Let's work together to bring your project to life!
    Featured Skill Blockchain
    Web3
    Cryptocurrency
    PayPal Integration
    Solidity
    Smart Contract
    Google APIs
    WordPress
    CSS 3
    Vue.js
    Laravel
    jQuery
    PHP
    Python
    Shopify
  • $60 hourly
    • 5.0/5
    • (41 jobs)
    I have 1.5+ year of professional Software Development experience in startups as well as established Software Companies. I've spent considerable amount of time designing projects from scratch, solving complex problems, rapid iterative prototyping and implementing changes. I have been working with Solidity and Blockchain projects for more than a year now. I have considerable experience in the following: - Token Launches (ERC20 - Mintable - Burnable - Reflections - TxFee) - Presale / IDO / ICO for tokens via ETH/ERC20 NFTs - ERC721 / ERC1155 - Standard NFTs with Whitelist/Royalties - Presale / Public Sale - Dutch Auctions - IPFS Hosting - Dynamic NFTs (via ChainLink) All my contracts feature the following: - Latest Solidity Version - Latest contract design standards - Large number of tests to check all code - Making sure security practices are followed - Initial Testnet deployment for testing by the client - Contract verification on Etherscan (or corresponding block explorer) I have worked with the following blockchains - Ethereum - Binance Smart Chain (BSC) - Polygon (or Matic) - Tron - Harmony About my Backend Development Experience: I have single handedly managed the entire backend in the startup I worked for and have quite some experience working on NodeJS/MySQL/MongoDB tech stack.
    Featured Skill Blockchain
    Distributed Ledger Technology
    Bitcoin
    Ethereum
    Java
    Solidity
    JavaScript
    Spring MVC
    Node.js
    MySQL
    MongoDB
  • $60 hourly
    • 5.0/5
    • (34 jobs)
    Top 1% Freelancer: Upwork has awarded this freelancer the Expert Vetted Badge! Blockchain | AI | Mobile Co-Founder @InMindSoftware | CTO @ TIEX Tech enthusiast, always looking to enhance and activate businesses for my customers through new technologies, especially blockchain, AI, and mobile. Amateur runner. Our team enjoys doing great work and forming long-term partnerships with our clients. We love innovation and working hard to solve problems that others cannot.
    Featured Skill Blockchain
    Mobile App Development
    Android App Development
    iOS Development
    Kotlin
    Java
    Amazon Web Services
    Swift
    Node.js
    Objective-C
  • $60 hourly
    • 5.0/5
    • (48 jobs)
    github.com/SimRunBot Technologies I use: * Nextjs, React * Tailwind * Vercel * Stripe * Typescript/Javascript * Git
    Featured Skill Blockchain
    SaaS Development
    Web Development
    ChatGPT
    Stable Diffusion
    React
    NFT Minting
    Smart Contract
    Solidity
    TypeScript
    JavaScript
  • $28 hourly
    • 4.7/5
    • (343 jobs)
    Hi All 👋, We are ShamlaTech, Leading the way in AI-based solutions. At Shamla Tech, we specialize in a spectrum of services to bring your vision to life: Are you seeking cutting-edge AI solutions to propel your business into the future? Look no further! We are a team of accomplished AI specialists passionate about harnessing the power of artificial intelligence to solve real-world problems. With years of collective experience in the field, we're here to bring your AI projects to life. Why Choose Us? 👉 Expertise: We have a strong background in machine learning, deep learning, natural language processing, and computer vision. Our extensive knowledge allows us to design and implement AI models tailored to your specific needs. 👉 Innovative Solutions: We thrive on pushing the boundaries of what AI can achieve. Whether it's developing predictive models, recommendation systems, or chatbots, we're dedicated to creating innovative solutions that deliver tangible results. 👉 Data-Driven Approach: Data is the lifeblood of AI. We excel at data preprocessing, feature engineering, and building robust pipelines to ensure that the AI models we create are trained on high-quality data. 👉 Adaptability: AI is a rapidly evolving field, and we're committed to staying at the forefront of the latest trends and technologies. We can adapt to the unique requirements of your project and ensure it remains up-to-date with industry advancements. 👉 Collaborative Work: We believe in transparent and open communication. We'll work closely with you to understand your goals, provide regular updates, and ensure your vision is realized. Our Services Include: Machine Learning Model Development Natural Language Processing (NLP) Solutions Computer Vision and Image Recognition Data Analysis and Visualization AI Consulting and Strategy Custom AI Application Development Model Deployment and Maintenance Let's Get Started: Ready to embark on an AI journey that will transform your business? Contact us today, and let's discuss how we can leverage the power of artificial intelligence to drive your success. Together, we can turn your AI dreams into reality.
    Featured Skill Blockchain
    Magento 2
    Magento
    PrestaShop
    Bitcoin
    Ethereum
    iOS Development
    Mobile App Development
    Android App Development
    Swift
  • $60 hourly
    • 5.0/5
    • (36 jobs)
    💎 Hackathon + Grant Winner (Starknet Thailand 2024, A51.Finance) ✨ Praised by Kerberus.com founder (Top 10 PayPal Hacker, Dropbox Hall of Fame) 🥇 Top 1% EVM + Solana Talent on Upwork 📈 $33M+ TVL | 28+ DApps Built | 7+ Token TGEs 👋 Hey! I’m Sami — a full-stack product engineer specializing in Blockchain, AI, and rapid product development. I take your app from idea to working product in days, not months, starting at just $500. From tokenized protocols and smart contract systems to GPT-powered apps and real-time dashboards — I help startups and teams ship fast and scale smart. 🚀 What I Do Best 🔧 MVPs & Full App Builds Rapid prototyping with tools like Replit, Cursor, and Framer — or built from scratch with production-grade stacks. 🧠 AI-Powered Systems OpenAI/GPT integrations, vector DBs, agents, internal copilots, smart automation, and analytics bots. 🪙 Blockchain Engineering Smart contracts, token launches, DeFi protocols, liquidity automation, staking, cross-chain messaging, and NFT infra. 📊 Dashboards & Internal Tools Admin panels, analytics dashboards, Airtable-style views, and operational control centers. 📦 Full-Stack Architecture Frontend, backend, infra, and on-chain — fully integrated and ready to deploy. 🛠 Tech Stack Frontend: React, Next.js, TypeScript, Tailwind, Framer Backend: Node.js, NestJS, Express, Golang AI/ML: OpenAI, LangChain, Pinecone, Vercel AI SDK Blockchain: Solidity, Rust, Cairo, Foundry, Hardhat, Web3.js, Ethers.js Infra & Cloud: Supabase, Vercel, AWS, Docker Data: PostgreSQL, MongoDB, Redis, Dune, The Graph 🧭 Ecosystems & Protocols Chains: Ethereum, Solana, Arbitrum, Optimism, zkSync, Starknet, BNB, Polygon Cross-Chain: LayerZero, Wormhole, Axelar, ThorChain DEXs: Uniswap, Curve, PancakeSwap, Raydium, 1inch, Jupiter Token Standards: ERC-20, ERC-721, ERC-1155, SPL Enterprise: Hyperledger Fabric, Quorum 🧠 I Can Help You With... Blockchain architecture & protocol design Tokenomics, liquidity strategies, and yield mechanisms Smart contract audits and gas optimization AI feature planning and system integration Product scoping, dev workflows, and fast iterations Shipping your idea to users or investors in record time 📩 Let’s Build Something Great — and Fast. Click "Invite" and tell me what you’re working on. I’ll bring it to life.
    Featured Skill Blockchain
    Crypto Wallet
    Tokenomics
    MERN Stack
    NFT Marketplace
    NFT Minting
    DApps
    Smart Contract Development
    Ethereum
    Cryptocurrency
    Web3
    Blockchain Development
    Blockchain, NFT & Cryptocurrency
    DeFi
    Solidity
    Solana
  • $19 hourly
    • 4.0/5
    • (57 jobs)
    I am a software engineer, Blockchain developer, and web developer,I am a writer also ,I like to write travelogue and stories, I have done Translation job also. Smart Contract Audit GoLang C C++ Jquery Nodejs MongoDb Docker IPFS Swagger java Solidity Web3 Cryptography Mocha /chai /sinon unit testing Git/Github Requirejs Ethereumjs Bug fixing with blockchain wallet integration Using Restful webAPI and integrate into blockchain Using RPC/JSON server and adding into blockchain Creating fully functional cryptocurrency exchange
    Featured Skill Blockchain
    React Native
    Database
    Solidity
    Smart Contract
    Creative Writing
    DApps
    Solidify
    Front-End Development
    React
    HTML5
    MySQL
    Node.js
  • $25 hourly
    • 4.4/5
    • (40 jobs)
    𝐈𝐟 𝐲𝐨𝐮'𝐫𝐞 𝐥𝐨𝐨𝐤𝐢𝐧𝐠 𝐟𝐨𝐫 𝐚 𝐝𝐞𝐩𝐞𝐧𝐝𝐚𝐛𝐥𝐞 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 𝐰𝐡𝐨 𝐜𝐚𝐧 𝐰𝐨𝐫𝐤 𝐢𝐧𝐝𝐞𝐩𝐞𝐧𝐝𝐞𝐧𝐭𝐥𝐲 𝐨𝐫 𝐚𝐬 𝐩𝐚𝐫𝐭 𝐨𝐟 𝐚 𝐭𝐞𝐚𝐦 𝐚𝐧𝐝 𝐝𝐞𝐥𝐢𝐯𝐞𝐫 𝐪𝐮𝐚𝐥𝐢𝐭𝐲 𝐬𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬 𝐨𝐧 𝐭𝐢𝐦𝐞, 𝐥𝐞𝐭’𝐬 𝐭𝐚𝐥𝐤. Hi, I’m Zeeshan, Senior Full Stack Developer and Blockchain Engineer with 6+ years of hands-on experience delivering robust, scalable, and secure digital solutions. I specialize in building full-featured web apps and blockchain-based platforms that meet real-world needs. Blockchain Development: Smart contracts, dApps, and DeFi integrations. 𝐓𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐒𝐤𝐢𝐥𝐥𝐬: Frontend: React.js, Next.js, Vue.js, Tailwind, HTML5, CSS3 Backend: Node.js, Laravel, Python (Django, Flask), Java, Golang, Rust Blockchain: Solidity, Rust, Web3.js, Ethereum, Solana, Hyperledger APIs & Microservices: REST, GraphQL, Spring boot Databases: PostgreSQL, MySQL, MongoDB 📌 𝐒𝐞𝐫𝐯𝐢𝐜𝐞𝐬 𝐎𝐟𝐟𝐞𝐫𝐞𝐝: Full Stack Web Development and Smart Contract/ Blockchain Integration
    Featured Skill Blockchain
    Solidity
    Golang
    Smart Contract Development
    Blockchain, NFT & Cryptocurrency
    Blockchain Development
    Solana
    Rust
    Full-Stack Development
    Web Application
    TypeScript
    JavaScript
    Django
    Python
    Node.js
    React
  • $110 hourly
    • 4.7/5
    • (28 jobs)
    Rapid&Efficient software development. I love what I do, and I am lucky enough that people pay me for it. I am a super enthusiastic person when it comes to software integration with a real-life task. Explain the challenge well enough, and I will give you one of the best solutions out there. Key Areas of Expertise: • Custom Website and dApp Development: Crafting unique digital experiences from the ground up, without relying on templates. Every project is an original creation, tailored to your specific needs. • Server Construction & Deployment Expertise: I build robust servers from basic components, demonstrating my deep understanding of hardware and software integration. Whether it's deploying on popular cloud platforms or custom solutions, I adapt to your preferred environment. • Data Scraping & Neural Network Feeding: I find joy in extracting data from the web, often for the purpose of training neural networks. While I do this for fun, my professional expertise ensures high-quality, efficient data gathering. • Blockchain Simplified: Having explained blockchain concepts on national TV to audiences as varied as a 50-year-old and a 6-year-old, I possess a unique ability to demystify complex technologies. Writing and deploying smart contracts come as naturally to me as speaking my mother tongue. I'm here to bring your vision to life with dedication and expertise. Let's create something amazing together! I'm happy to be of service (:
    Featured Skill Blockchain
    Blockchain Development
    Blockchain Architecture
    Rust
    C
    Solidity
    Database
    DevOps
    DApps
    Website Prototyping
    Cryptocurrency
    Smart Contract
    Bot Development
    Data Scraping
    Python
    JavaScript
  • $30 hourly
    • 5.0/5
    • (83 jobs)
    I am a courteous and enthusiastic Full Stack Blockchain Developer from Bangalore, India. Some of the skills I use now on Blockchain: expertise in solidity Ethereum | Solidity | Solana | Rust Token creation | NFT mint | NFT Marketplace | Auctions | Defi | Staking | ICO/IDO | Payment Protocol | Exchanges | and many more… Building cryptocurrencies, NFT staking, minting and marketplace dapps, defi dapps, decentralized exchange, decentralized donation platform, and much more. I have strong knowledge of solidity, and I keep myself up to date with the latest trends in the defi and NFT space. I am a MERN Stack developer. I build a web app using MongoDB, Express, React, and Node. I've been a web developer since 2018. I specialized in Blockchain Development and front-end and back-end application development. Here I am working as a single freelancer. Some of the skills I use now on the front-end: ➳ Language: JavaScript (ES5/ES6, Babel), HTML5, CSS3 with SCSS, …; ➳ Frameworks: ReactJS(Gatsby/NextJS), Redux; ➳ UI CSS Frameworks: Tailwind, React Suite, Material UI, Bootstrap, ...; ➳ Tests: Jest, TDD, enzyme, … ➳ Cloud: AWS, Firebase ➳ Design: Object-Oriented UI/UX Design, responsive web, … ➳ Others: Axios, AJAX, Webpack, npm, yarn, … Some of the skills I use now on the back-end: ➳ Language: Nodejs, Express, Socket.io, Javascript ➳ Database: MongoDB, SQL, AWS, Firebase Project Types: ✔ Online Shops / eCommerce ✔ API / Custom Libraries ✔ Highload Systems ✔ Custom CMS / CRM / Frameworks ✔ Online Gambling ✔ Websites more........ It is important for me to build a relationship with the client, so I am primarily looking for projects. I am ready to discuss requirements and communicate with your team via video chat.
    Featured Skill Blockchain
    Cryptocurrency Forking
    Solidity
    NFT Marketplace
    Initial Coin Offering
    NFT
    Redux
    Firebase
    Ethereum
    Smart Contract
    Layer 2 Blockchain
    React
    AWS Application
    Sass
    JavaScript
  • $30 hourly
    • 5.0/5
    • (49 jobs)
    I am a highly skilled **Blockchain Developer** specializing in **Solidity, C++, and Web3 technologies**. I have extensive experience in **Ethereum and Solana blockchain development**, building secure and efficient **smart contracts** for DeFi, NFTs, DAOs, and various DApps. Beyond blockchain, I also bring **graphic design and UI/UX expertise**, ensuring intuitive and engaging user experiences for **decentralized applications**. ### **My Expertise:** ✅ **Smart Contract Development (Solidity, C++, Rust for Solana)** ✅ **Ethereum & Solana Blockchain Development** ✅ **DApp Development & Web3 Integration** ✅ **UI/UX & Graphic Design for Web3 Platforms** ✅ **Problem-Solving & Decision-Making** ✅ **Excellent Communication & Client Satisfaction** With a Bachelor’s in Computer Science from Government College University, I am committed to delivering **top-tier blockchain solutions** tailored to client needs. Let’s build innovative and decentralized technology together! 🚀
    Featured Skill Blockchain
    DApps
    C++
    Smart Contract
    NFT Metadata
    Solidity
    Blockchain Development
  • $20 hourly
    • 5.0/5
    • (24 jobs)
    I have worked on 25+ NFT projects and smart contract audits. I can generate an 2D, 3D, gif and interactive NFT collection with metadata. I can develop dapp using React for NFT projects. Expert in customized, low gas fee smart contracts. Proficient in Merkle Tree based off-chain whitelisting, which will save thousands of dollars.
    Featured Skill Blockchain
    Front-End Development
    Three.js
    Full-Stack Development
    Blockchain, NFT & Cryptocurrency
    NFT Collection Generation
    React
    NFT Marketplace
    Blockchain Development
    Ethereum
    Smart Contract
    Solidity
    NFT
    web3.js
  • $40 hourly
    • 4.5/5
    • (53 jobs)
    Hello, "28 Successful Jobs related to data engineering" Why should you hire me ? ✅ 750+ Upwork Hours Completed ✅ 100% Customer Satisfaction Some Reviews: 💡 A simple python transcript for traffic profiling "Hands down, Muzammil is the best Python programmer I’ve worked with so far. He’s extremely professional, smart, dedicated and easy to work with. He came in ahead of schedule and under budget with well organized and well-documented code. Not just that, I came up with some last-minute amendments in design and Muzammil willingly did all, making sure that I’m satisfied with the final deliverable. Simply outstanding! Will definitely have him for my upcoming projects. Thank you Muzammil!" 💡Python Interface to Binance Smart Chain Exchanges "Muzammil has been great to work with on a variety of blockchain and programming tasks and projects we have set him over the last 12 months. He has maintained a high level of professionality and has managed to successfully tackle all of the problems we have had him working on so far. Has proven to be a real asset to our business." - FTMC Co. I can create automation tools and bots in Python to give you a comprehensive solution for scraping websites, ingesting data and database integration. Furthermore I also have experience with setting up a Bitcoin/BSC/Ethereum Node and writing robust code in Solidity for smart contracts. Services I provide as an Data engineer: ⦁ Data Cleansing using Python ⦁ Data Wrangling with Pandas and Numpy ⦁ Data Extraction with python requests from API calls ⦁ Web Scraping with BeautifulSoup and Scrapy ⦁ Data Manipulation (Excel, XML, CSV, JSON, YAML, image files) ⦁ Design/Development/Management of ETL/ELT solutions ⦁ Familiarity with Microsoft Azure based Data Warehousing (Azure SQL, Azure Synapse Analytics, and Azure CosmosDB). ⦁ Familiarity with Microsoft Azure based ETL tools (Azure Data Factory, Azure Stream Analytics, and Azure Databricks) ⦁ Familiarity with Amazon Web Services (AWS EC2, AWS Lambda, AWS DynamoDB, AWS Redshift, AWS EMR Clusters, and AWS EKS) ⦁ Integration of Apache Kafka for smooth streaming ⦁ SQL Databases (MySQL, Postgresql, and MSSQL) ⦁ NoSQL Databases (MongoDB, and GraphQL) ⦁ Familiarity with SQL Server Management Studio (SSMS) ⦁ Designing Data Warehouse based on Star Schema and Snowflake Schema Orchestration Services I provide: ⦁ Apache Airflow ⦁ Orchestration with Docker compose ⦁ Building pipeline in Jenkins Data Visualization Service I provide: ⦁ PowerBI Automation and Backend Services I provide: ⦁ Automation testing using selenium ⦁ Django Backend ⦁ Creating RESTFUL APIs with FastAPI AI Services I provide: ⦁ Integration of OpenAI's gpt 4 and gpt 4 turbo ⦁ Integration of Google Bard ⦁ Implementing ML models ⦁ Integration other LLM's in your application Blockchain Services I provide: ⦁ Blockchain Development (Ethereum, Binance Smart Chain, Solana, Xinfin, Avalanche, Polygon) ⦁ Blockchain Consultancy ⦁ Dapps Development (Liquidity contract, Yield farming, NFT marketplace, Verification contract) ⦁ Smart Contracts (Solidity) ⦁ Setting up a Node (Bitcoin/BSC/Ethereum/Solana) ⦁ Full-Stack Blockchain Development ⦁ Integration of Dapp with Reactjs
    Featured Skill Blockchain
    Microsoft Azure
    Smart Contract
    Data Cleaning
    Automation
    web3.js
    Solidity
    Solana
    API
    Blockchain, NFT & Cryptocurrency
    Data Scraping
    Python
    API Integration
    ETL Pipeline
  • $20 hourly
    • 5.0/5
    • (6 jobs)
    I am passionate about helping individuals reach their full potential and achieve their goals. With a background in Full Stack Development, I bring more than 3 years of experience to my work. My mission is to provide tailored solutions that inspire growth and success. Let's embark on this journey together and turn your aspirations into achievements As a seasoned full stack developer, I offer a comprehensive range of services tailored to meet your web development needs. From front-end design to back-end functionality, I specialize in creating dynamic and user-friendly applications. Whether you require responsive website development, custom web application design, database integration, or API development, I'm equipped to deliver high-quality solutions that exceed expectations. With a focus on innovation and efficiency, I ensure seamless navigation, optimal performance, and scalability for your projects. Let's collaborate to bring your ideas to life and elevate your online presence. Technologies stack: Front-end: HTML5, CSS3, JavaScript (ES6+), React.js, Back-end: Node.js, Express.js, Django, Flask Database: MongoDB, MySQL, PostgreSQL, Firebase Version Control: Git, GitHub, GitLab Deployment: Heroku, AWS, Google Cloud Platform API Integration: RESTful APIs, GraphQL Other Tools: Docker, Kubernetes, npm, Yarn If you don't find the service you need in the list, feel free to ask me directly!
    Featured Skill Blockchain
    Cardano
    Blockchain, NFT & Cryptocurrency
    NFT Marketplace
    NFT Minting
    Smart Contract
    Web3
    React
    MongoDB
    Node.js
    GraphQL
  • $70 hourly
    • 5.0/5
    • (135 jobs)
    Software engineer passionate about problem-solving, developing high-performance software solutions, and leveraging blockchain and algorithmic trading expertise. Proven ability to deliver secure, scalable, and efficient applications for diverse industries, including fintech, blockchain, and software automation. Examples of past projects: - Creating NFTs, tokens, and altcoins - Writing and deploying smart contracts - Coding strategies and indicators for MT4, MT5, TradingView, and NinjaTrader - Building trading bots for cryptocurrencies that operate on centralized/decentralized exchanges (e.g., Kraken, Binance, PancakeSwap, Uniswap, etc.) - Connecting proprietary strategies to brokers for trading securities, forex, options, futures, commodities, and indexes (e.g., Interactive Brokers, Robinhood, etc.) - Web and app development - Retrieving web data and web automation - Developing cross-platform desktop applications for macOS, Windows, and Linux - Adding security features or licenses to software applications - API development - Retrieving data from ChatGPT, Telegram, Discord, Instagram, or other messaging/social media platforms and integrating it into custom applications Programming Languages & Development -Backend: Python, Node.js, C# -Frontend: JavaScript (React), HTML/CSS, C++ -Smart Contracts & Blockchain: Solidity, Rust, Web3.js, ethers.js, dApp development -Algorithmic Trading: MQL4, MQL5, Pine Script, C#, Python's Machine Learning Frameworks Infrastructure -Cloud & Servers: AWS (EC2, S3, CodePipeline), Vercel, Render -Database Management: MySQL, MongoDB -Security & Performance Optimization: Smart contract security, API security -CI/CD & Automation: GitHub Actions, automated deployment pipelines Feel free to contact me with any questions or queries.
    Featured Skill Blockchain
    JavaScript
    Websockets
    API Development
    Trading Automation
    MQL 5
    HTML5
    CSS 3
    Financial Trading
    Bitcoin
    Cryptocurrency
    Bot Development
    MQL 4
    Node.js
    API Integration
  • $70 hourly
    • 5.0/5
    • (15 jobs)
    Hello - My name is Tom. I’m a freelance software engineer based in Ireland. I mostly work with entrepreneurs and startups, helping them shaping their digital products and bringing them to the market. I do not only deliver high quality code, but also have a product oriented approach and I value strategy and design as much as I do good code. I do have extensive know-how about web development and deployment, Blockchain, Shopify, Web scraping, automation services and much more. I believe I will be a good team member to work with, considering my experience and know-how in the field. I personally have 10+ years of experience in the industry and my most recent, ongoing work is ton chain token launchpad.. If you want to know more about me, my workflow or discuss the project details, please don't hesitate to get in touch. Regards Tom C
    Featured Skill Blockchain
    web3.js
    DApps
    Solidity
    Ethereum
    Smart Contract
    Blockchain Development
    Cryptocurrency
    AI Bot
    Next.js
    Python
    Django
    Node.js
    React
    JavaScript
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How to Hire Top Blockchain Developers for Your Needs

Brands are constantly evolving. To stay ahead in the digital age, they need a robust, secure, and innovative blockchain foundation. Enter blockchain developers—the masterminds who build and maintain these decentralized systems, ensuring your brand stays on the cutting edge of technology. Just as Canva designers use their tool to create eye-catching graphics, blockchain developers utilize various programming languages, frameworks, and platforms to develop, test, and deploy blockchain applications tailored to your business needs. 

When hiring a blockchain developer, it’s crucial to find someone who not only understands the technical aspects but also aligns with your project’s vision. Developers bring their own unique skill sets, such as expertise in Ethereum, Hyperledger, or smart contract development. Finding and hiring the best blockchain developer starts with understanding the role, evaluating the market demand and your budget, and crafting a well-thought-out job posting that attracts top talent. This guide will help you navigate the process of hiring the right blockchain developer to bring your brand’s innovative ideas to life.

Writing a blockchain developer job posting

Attracting the ideal blockchain developer starts with crafting a job post that speaks directly to their skills and interests. When creating your blockchain developer job posting, it’s essential to specify the type of projects and blockchain solutions you need and clearly outline the expertise and experience you’re seeking in a developer.

The following outline will help you create a job posting that covers all the necessary details:

Job post title

Effective job posts are clear and concise. Your blockchain developer job post title should immediately convey what you’re looking for. Consider these examples:

  • Blockchain developer (Ethereum specialist). Searching for a developer to create and deploy smart contracts on the Ethereum network for our decentralized finance (DeFi) platform.
  • Hyperledger developer. Hiring an expert in Hyperledger to design and implement a private blockchain network for our enterprise-level supply chain management system.
  • Blockchain security engineer. Need a developer with a strong background in cryptography to audit and enhance the security of our blockchain applications.
  • Smart contract developer. Seeking a developer experienced in Solidity to create and maintain smart contracts for our tokenized ecosystem.
  • Blockchain consultant. Looking for a blockchain expert to advise on integrating blockchain technology into our existing infrastructure and guide our transition to a decentralized system.

Project description

When writing your blockchain developer job post, be sure to include the following key elements:

  • Scope of work. Clearly outline the project’s objectives and specific deliverables. This might include developing smart contracts, creating decentralized applications (dApps), or building a private blockchain network. Be specific about the tasks and technologies involved, whether it’s working with Ethereum, Hyperledger, or another blockchain platform.
  • Project length. Estimate the project’s duration, including the expected number of hours or deliverables. Specify whether the project is a one-time task or if you’ll require ongoing support for maintenance, updates, or scaling.
  • Background. Indicate if you’re seeking candidates with particular backgrounds or specializations, such as experience in DeFi (decentralized finance), NFT development, or blockchain security.
  • Budget. Provide a budget range and indicate whether you prefer an hourly rate or a fixed-price contract. Make sure the budget aligns with the complexity and demands of the project.

Blockchain developer responsibilities

Include the core responsibilities for the blockchain developer role or project. Here are some examples:

  • Smart contract development. Write, test, and deploy smart contracts using Solidity or other relevant languages on platforms like Ethereum.
  • Blockchain architecture design. Design and implement blockchain architecture tailored to the specific needs of your project, whether it’s public, private, or consortium-based.
  • Security audits. Conduct thorough security audits of smart contracts and blockchain applications to identify vulnerabilities and ensure the integrity of the system.
  • Integration. Integrate blockchain solutions with existing applications or third-party services, ensuring smooth and efficient interoperability.
  • Decentralized application development. Build and deploy decentralized applications (dApps) that run on blockchain technology, ensuring a user-friendly experience.

Blockchain developer skills and qualifications

Let candidates know if you’re looking for specific skills or qualifications, such as:

  • Blockchain expertise. Proficiency in blockchain platforms like Ethereum, Hyperledger, or Binance Smart Chain, with demonstrated professional experience.
  • Smart contract development. Advanced skills in programming languages such as Solidity, Rust, or Vyper, with a strong portfolio of deployed contracts.
  • Cryptography knowledge. Deep understanding of cryptographic principles, including public-key cryptography, encryption algorithms, and hashing functions.
  • Project management. Ability to manage multiple blockchain projects simultaneously, coordinating with other team members, including front-end developers, QA testers, and project managers.
  • Security focus. Expertise in blockchain security practices, including threat modeling, secure coding, and incident response.
  • Experience with DeFI or NFTs. Familiarity with developing decentralized finance (DeFi) applications or non-fungible tokens (NFTs), including understanding token standards like ERC-20, ERC-721, and ERC-1155.

For even more detailed information on crafting the perfect job description, Upwork’s job description templates can help.

What to know before hiring a blockchain developer

Whether you’re new to blockchain or looking to expand your current capabilities, knowing what to expect can help you make informed decisions when hiring a blockchain developer. From understanding the basics of blockchain technology to budgeting and identifying the solutions a skilled developer can offer, this section will guide you through the crucial factors to consider and understand before hiring a blockchain developer. 

What is blockchain development?

Blockchain development refers to the process of creating and implementing blockchain technology, a decentralized and distributed digital ledger that records transactions across many computers in a way that ensures security, transparency, and immutability. Unlike traditional databases, blockchain operates without a central authority, making it a powerful tool for industries ranging from finance to supply chain management.

In simple terms, blockchain development involves building applications that run on this decentralized network, such as smart contracts, cryptocurrencies, or decentralized applications (dApps). Whether you’re looking to create a secure payment system, track assets, or develop a new token, blockchain developers are the experts who bring these innovations to life. Their work is at the forefront of the tech revolution, helping to shape the future of how we conduct business and manage information.

Average cost to hire a blockchain developer in 2024

When budgeting for a blockchain developer, you’ll want to consider the range of costs associated with different levels of experience. While the final cost will depend on various factors such as the developer’s expertise, location, and current market demands, here’s a general breakdown of what you can expect to pay per hour on Upwork:

  • Beginner. Under $20 per hour
  • Intermediate. Between $30 and $60 per hour
  • Expert. Up to $210 per hour

Keep in mind that highly specialized skills or developers in high-demand regions may command higher rates. Balancing your budget with the level of expertise required for your project is key to finding the right developer for your needs.

Key tools and technologies used by blockchain developers

Blockchain developers rely on a variety of tools and technologies to build secure and efficient applications. These tools help them write, test, and deploy code, as well as manage the underlying blockchain infrastructure. Here are some of the key tools and technologies they use:

  • Solidity. A programming language specifically designed for writing smart contracts on the Ethereum blockchain.
  • Hyperledger Fabric. An open-source framework for building enterprise-grade blockchain applications.
  • Truffle Suite. A development environment, testing framework, and asset pipeline for Ethereum, making it easier to develop and deploy smart contracts.
  • Ganache. A personal blockchain for Ethereum development that developers use to test and deploy smart contracts in a controlled environment.
  • Remix IDE. An online Integrated Development Environment (IDE) used for writing, testing, and debugging Solidity smart contracts.
  • Metamask. A browser extension that acts as a wallet and gateway to blockchain apps, allowing developers to interact with the Ethereum network.
  • Infura. A service that provides scalable access to Ethereum and IPFS, allowing developers to connect their applications to the blockchain without needing to run their own nodes.

Business solutions blockchain developers offer

Blockchain developers offer a wide range of business solutions that leverage the power of decentralized technology to improve efficiency, security, and transparency. These solutions can be tailored to meet the unique needs of various industries. Here are some of the key business solutions they provide:

Smart contract development

Blockchain developers can automate and secure business processes through self-executing contracts that automatically enforce the terms of an agreement, reducing the need for intermediaries and minimizing the risk of human error.

Cryptocurrency integration

Developers enable businesses to accept, manage, and transact with digital currencies, facilitating secure and borderless payments that can enhance global trade and customer convenience.

Supply chain management

Blockchain technology improves traceability and transparency across supply chains, allowing businesses to track products from their origin to the final destination, thus ensuring product authenticity and reducing fraud.

Decentralized applications (dApps)

Blockchain uses decentralized apps running on peer-to-peer (P2P) networks instead of a single computer to safeguard user privacy and increase developer flexibility. These dApps often use the Ethereum platform. 

Tokenization of assets

Blockchain developers convert physical or digital assets into tokens that can be traded on blockchain platforms, opening new avenues for investment, ownership, and liquidity in various markets.

Blockchain security solutions

By leveraging blockchain’s immutable ledger, developers enhance cybersecurity, protecting sensitive data and transactions from unauthorized access and tampering.

Identity management

Developers create secure, decentralized identity systems that give users control over their personal information, reducing the risk of identity theft and improving the security of online interactions.

Hire your next blockchain developer on Upwork

Leveraging cutting-edge blockchain technology is key to driving innovation and securing your brand’s future in the digital landscape. Whether you need a robust smart contract to streamline business operations or a decentralized application (dApp) to engage your users, partnering with top blockchain developers can ensure your projects are executed flawlessly and on time.

By understanding the intricacies of the role—from the specific responsibilities to typical projects and associated costs—you can kickstart your Upwork search with confidence when hiring a blockchain developer. Sign up for Upwork today and turn your vision into reality—get the secure, scalable solutions you need to stay ahead of the curve, whenever you need them. 

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