Hire the best Solidity professionals

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4.7/5
based on 1,315 client reviews
  • $35 hourly
    Hi there! If you are visiting my page, then you are definitely in the right place for a high-paced software developer, and tech lead to deliver your project. I am an experienced Solidity, Web3, and Python Developer with an overall experience of 3+ years. I specialize in writing smart contracts, Python Scripting, and Full-Stack Development. To date, I have delivered over multiple large-scale projects to my clients in and outside of Upwork. Some of the blockchain projects I have worked on have made over $300K+ in total revenue during launch. You can check my portfolio here: manishgotame.com.np In the field of Blockchain, I have experience in: - Chains: Ethereum, Binance Smart chain, Solana, Polygon, etc. - Writing gas-efficient smart contracts in Solidity. - ERC721 / ERC20 / ERC1155 token standard contract. - NFTs, Staking, DAO, AMM, etc. - Proper Contract testing using Hardhat. - Web3 Integration with 15+ wallet connections in React.js, functional on both mobile and web. Python / Django: - Full-stack development using Django in the backend, React in the frontend. - Have worked on multiple large-scale web applications in the field of data extraction, and scraping. - I have built custom OCR libraries and data extraction tools. - AI models using Keras, and Pytorch integration within your web application. My strong sides are responsibility, attention to clients' needs, and a strong will to achieve the final results of team efforts. It's enough comfortable for me to work both in a team and in stand-alone development. Send me a message and let's start hammering out the details of your project.
    vsuc_fltilesrefresh_TrophyIcon Solidity
    PDF Conversion
    Django
    Scripting
    web3.js
    Smart Contract
    React
    HTML5
    Blockchain
    Ethereum
    CSS
    jQuery
    JavaScript
    Python
    Data Extraction
  • $180 hourly
    California-based programmer with an extensive background in a variety of technologies, including desktop, mobile, and web platforms. I deliver high quality software by communicating with my clients effectively and working tirelessly to understand their exact needs for a project. With a thorough analysis of the problem and an effectively designed solution, I'm able to leverage years of independent software experience to implement and deliver your product quickly and effectively. I graduated from Santa Clara University with a Master's degree in Software Engineering in 2012, and have spent the last decade working with clients all over the Silicon Valley area. Here on Upwork, I've achieved and currently hold the Top Rated, Top Rated Plus, and Expert-Vetted talent badges - which are the highest the platform offers. I've also acquired AWS certifications in a variety of disciplines, all of which contribute to my broad understanding of technical domains and enhance my ability to design and implement effective solutions tailored to your project's needs. I strive to delight my clients with every project I undertake, and I would love to do the same for you. Please reach out if you have any questions!
    vsuc_fltilesrefresh_TrophyIcon Solidity
    Smart Contract
    Cryptography
    Blockchain Development
    Cryptocurrency
    Blockchain Architecture
    API
    Amazon Web Services
    JSON
    C++
    Python
    JavaScript
    Desktop Application
    API Integration
  • $75 hourly
    Full Stack developer working on native mobile apps(Android and IOS) as well as cross platform apps(Phonegap/Sencha/Ionic/ReactNative/Angular/Flutter). I do work on server side technologies(PHP/Node/.net Core/Ruby/Python mostly) as well as APIs for apps. So I handle things on the client and server side as well. I do complete most of the apps by myself and I mostly do social apps. Apart from social apps I have worked on location based services as well as different Web portals. I have worked on some Crypto exchanges so I have good knowledge of Blockchain as well. I have worked on smart devices so I am well versed with Alexa skills and artificial intelligence. Apart from that I have worked on Web designs as well as on WordPress/Squarespace themes. I have developed ecommerce site in Shopify. Technologies: Android/IOS/Ionic/Phonegap/PHP/WordPress/ReactNative/.Net Core/Angular/ROR/Python/Blockchain/Alexa/Blockchain/AI/BI/Shopify/Squarespace/Flutter Industries I worked for: 1) Marketplaces(Similar to Uber in the fitness and beauty industry) 2) Real Estate 3) Social Mobile and Web startups 4) Cannabis startups 5) Ecommerce(Shopify, Woocommerce) 6) News/Media and Law 7) Learning Management Systems
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    iOS Development
    Initial Coin Offering
    React Native
    Ionic Framework
    Laravel
    Smart Contract
    Android App Development
    Mobile App
    Blockchain Development
    PHP
  • $80 hourly
    ✅ Top Rated ✅ 5 Stars feedbacks ✅ 10 Years experience in development I'm from Latvia! Skilled with both front-end and back-end with an eye for innovative and exclusive designs. I've got experience in Solidity and Blockchain fundamentals, I can help You out with most of the crypto-related tasks, setting up blockchain explorer, generating your own currency or writing smart-contracts on Ethereum Network for Decentralized Exchange I also specialize in HTML, CSS, Javascript, jQuery, Bootstrap, PHP, Node.Js, React, Angular, MongoDb, WordPress, Shopify, Braintree, and a whole host of other technologies, platforms, and libraries. Whatever your needs are, I will find a solution that fits it. I can be a complete solution to most of the web-related tasks from simple HTML pages and Photoshop edits to complex E-commerce frameworks and database management activities. My passion is design and art, which is also reflected on art of writing code and solving IT problems. Fast learner and adaptable to different project environments. Team player, but can also work solo. 🤘🌟👨‍💻
    vsuc_fltilesrefresh_TrophyIcon Solidity
    Ethereum
    Web Design
    Blockchain
    Unit Testing
    Smart Contract
    Blockchain Development
    Cryptocurrency
    web3.js
    Web Development
    Angular
    React
    JavaScript
  • $250 hourly
    Hi! I am a senior full-stack software engineer, researcher, and blockchain developer, with 6+ years of experience in professional development and freelancing—primary expertise in Solidity, Python, C#, .NET, Typescript. I have a BSc in Computer Science, an MSc in Financial Computing, and I'm currently pursuing a Ph.D. in Financial Machine Learning. I am a Teaching Assistant at University Politehnica Bucharest, teaching Intro to C Programming, Logic Circuit Design, Intro to Linux / Operating Systems. Skills: - frontend development - Javascript/Typescript, PHP, HTML5, CSS3, LESS/SASS, React, React Redux, Angular, Vue.js, Knockout.js, Bootstrap, Bulma - backend development - Node.js, express, C#/.NET, Java Spring Boot - database engines: MySQL, MSSQL, Postgres, Neo4j - software programming - Python, Java, C/C++, C# - blockchain - Solidity (Ethereum), contract auditing, blockchain research, smart contract development - machine learning - Python, PyTorch, Tensorflow - web botting & data scraping - C#, MS Interop, Python bots, Phantom.js, Selenium - automated testing & CI/CD: Jenkins, Mocha, Jest, Chai, Python unit testing, Cucumber, SpecFlow - IaaS: Azure, AWS, Terraform - workflow - extreme programming (XP), agile development, test-driven development
    vsuc_fltilesrefresh_TrophyIcon Solidity
    Ethereum
    Smart Contract
    DApps
    React
    Automated Testing
    Web Design
    C#
    Blockchain
    JavaScript
    Machine Learning
    Python
  • $185 hourly
    I am a California based NFT smart contract developer/web3-DApp developer/NFT consultant/advisor and have successfully launched over 10 NFT projects for my clients. I have provided consultation for over 20 NFT clients too. I have also worked on my own 10k generative ERC721 NFT art project. I was involved in every aspect of the NFT project from start to finish including contract development, twitter/discord marketing, generating the 10k art illustration, uploading images to IPFS, website design, integrating web3 for website minting, etc. I look forward to hearing from you and learning more about your project! Eugene
    vsuc_fltilesrefresh_TrophyIcon Solidity
    Blockchain
    Ethereum
    Front-End Development
    Blockchain Development
    Website
    Web Design
    Cryptocurrency
    DApps
    Smart Contract
    web3.js
    Web Development
    JavaScript
    React
  • $50 hourly
    Web blockchain development. Over the past 6 years, I have developed and delivered numerous web applications using JavaScript, Vue.js, NodeJS, etc. I always do my best to provide my clients with clean, organized code, responsive and perfect working applications.
    vsuc_fltilesrefresh_TrophyIcon Solidity
    API
    Smart Contract
    Ethereum
    Blockchain Development
    web3.js
    AngularJS
    Vue.js
    Google Chrome Extension
    Web Application
    MongoDB
    MySQL
    Node.js
  • $40 hourly
    With my extensive background as an experienced software engineer and blockchain developer, I possess in-depth knowledge and skills in designing, implementing, and overseeing intricate software applications. Having accumulated over 6 years of industry experience, I have cultivated a diverse proficiency in software development utilizing various programming languages, frameworks, and databases. In addition to my software development expertise, I possess a comprehensive understanding of effectively scaling solutions to meet client requirements. I am well-prepared to assist you in navigating the complex process of launching a successful web3 project, offering a refreshing alternative to the often unsatisfactory experiences encountered with inexperienced freelancers or under qualified developers. If you are seeking a dependable and seasoned professional to bring your vision to fruition, your search ends here. I maintain flexible pricing, which is subject to negotiation and depends on the project scope and timelines. My professional services include, but are not limited to, the following: Cryptocurrency & Blockchain Development: ✅Smart Contract Creation {​​​​​​​​​ Tokens | NFTs | DAOs | Flash Loan | Arbitrage | and more... }​​​​​​​​​ ✅NFT Marketplace Development ✅Smart Contract Auditing ✅Decentralized Applications (dApps) ✅EVMs {​​​​​​​​​ Solidity }​​​​​​​​​ ✅Parachains {​​​​​​​​​ Rust | Partisia | Luna | Substrate }​​​​​​​​​ ✅Web3.js Web Development: ✅HTML | CSS | JavaScript | PHP ✅Web3 JS | React JS | Angular | Typescript ✅Database {​​​​​​​​​ MySQL | PostgreSQL | MongoDB | and more... }​​​​​​​​​ Mobile App Development: ✅iOS {​​​​​​​​​ Swift | Objective-C }​​​​​​​​​ ✅Cross-Platform Compatibility ✅Flutter ✅React Native Other: ✅Dev Ops Support ✅ Bot Development ✅Technical & Whitepaper Creation ✅Tokenomics Consulting ✅Business Consulting I offer additional services beyond the ones mentioned above, so please feel free to inquire about specific requirements.
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    Web Application
    Front-End Development
    React
    Amazon Web Services
    Avalanche
    DApps
    Cryptocurrency
    Blockchain
    Web3
    Node.js
    JavaScript
    Smart Contract
    Blockchain Development
  • $60 hourly
    I am a blockchain smart contract Developer & Consultant, writing smart contracts, creating cryptocurrencies, NFTs, and launching ICOs, with 5 years of experience with solidity and smart contract development in the ethereum blockchain ecosystem. My expertise: - Determining the viability of a blockchain based solution for your business needs - Write smart contract logic code for anything you can think of. - Decentralized cryptocurrency exchange (DEX) - Front Running / Back-running Bots - DEX based trading bots for cryptocurrency - Binance smart chain development - Smart contract Audit - NFT, IPFS, ERC721, ERC1155 development - Token & Coin development - Staking, yield farming, lottery, prediction smart contracts
    vsuc_fltilesrefresh_TrophyIcon Solidity
    KuCoin Shares
    API
    Automation
    Blockchain Development
    Node.js
    Python
    Cryptography
    Binance Coin
    Cryptocurrency
    Smart Contract
    Blockchain
  • $50 hourly
    Blockchain developer and defi enthusiast with over 3 years of experience in the field. With all the recent hacks happening, developing a decentralized app is a very risky proposition. You don't want an application handling millions of dollars, getting hacked due to a developer bug. This is where you need me. With a development history of over 20 products which include both DeFi dapps and NFTs, I have the required experience for this job. I would love to gain more experience in this field, by working on new and innovative projects.
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    Google Chrome Extension
    Algorithm Development
    Node.js
    Golang
    Blockchain
    Cryptocurrency
    Python
  • $175 hourly
    With my experience as a software engineer, I have developed a process to deliver highly reliable software to solve your most critical problems and accomplish your most valuable goals. I will first directly work with you to understand your requirements and reach a mutual agreement of the optimal solution, and then I will work diligently to implement this solution. My own development tools and processes include version control, automated tests, documentation, and much more. I value rapid prototyping and a quick feedback loop with stakeholders, and I will be able to adjust my development process to fit a project's unique needs.
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    GitLab
    React
    Node.js
    Electron
    TypeScript
    JavaScript
    CSS
    React Native
    HTML
    Git
  • $30 hourly
    Just a passionate developer:- 🥇Expert Python Developer & Programmer with 5+ years of expertise in custom Python development with Django/Flask, React, JavaScript, AWS and extensive experience in Python/scrapping website, web portal. Strong background in web applications & API development, bots programming and browser automation solutions. I tend to be extremely straightforward about what I can do and how long it might take me to do it. I know my limits, and I try to break past them every single day. I strive to find exciting ways both old and new to challenge myself in my quest to become a python and JavaScript Jedi master! Python development & programming is not only my work, but it is also my passion. I love to develop innovative Python applications. ⭐Let me share more about my Expertise and Exerience:- I mainly use Python - Flask, Django framework for most of my projects. I've been using Python for about 3+ years now . I'm also extremely comfortable with Javascript - Vanilla, React. That said, I'm not going to say that I'm amazing at coming up with Web Designs since it takes me forever to come up with a design I'm satisfied with; I much prefer to be handed a design to work with and prefer to do backend word more compared to front-end, but am capable of doing full stack as well. 🌟Technical skill set:🌟 ✅ Experience with Python and its frameworks: Django, Flask ✅ AWS Lambda,AWS SAM, EC2, S3, GoDaddy, Graylog, etc ✅ Comprehensive knowledge on web and mobile backends, particularly Django and Django REST framework, Flask, Scrapy (Web Scraping) Other COOL python libraries ✅ Designing scalable backends using microservices architecture ✅Data Management: RDBMS: MySQL 5.X, PostgreSQL As a Full Stack Python developer & programmer, I have successfully developed a wide range of custom Python development projects with high-end functionalities. I understand all aspects of developing Python applications: design, architecture, development, and publishing. 👉Are you looking full time & dedicated Python developer to develop a user-friendly high-end functionality-based website or web application ? I will love to engage myself as a Full Stack Python developer and assist you with innovative and creative strategies. Also, I have good experience in EVM based blockchain development. I can build , deploy smart contracts as per your requirement, and all the smart contracts will be rigorously tested to maintain high security. I can build corresponding front-end for the smart contract using ethers.js and REACT. If you have any idea on the web3 space, please don't hesitate to message me. I always looking forward to interacting with people with innovative ideas and helping them bring it to reality.
    vsuc_fltilesrefresh_TrophyIcon Solidity
    Ethereum
    Blockchain
    Cryptocurrency
    Blockchain Development
    JavaScript
    Smart Contract
    web3.js
    Node.js
    Binance Coin
    Blockchain Architecture
    Truffle
    Web Development
    React
  • $100 hourly
    I've worked with - ☑️ An AI-based Fintech startup working on 2 projects as Senior React Developer, leading a team of 3 devs ☑️ A Web3 infrastructure startup working on 5 projects as NodeJS + Solidity developer (leading React development in all projects) - - 2 Desktop apps from scratch (design + development) using TypeScript, React, MUI and Electron - 1 Firefox Extension redesigning the entire UI and implementing a secondary window for transaction confirmation - 1 dApp from scratch, wireframing & designing the UI in Figma, writing the smart contracts in Solidity, and using React + TypeScript + Tailwind to develop the app - 1 NodeJS backend service fixing critical bugs before release ☑️ A Construction company adding new features to their existing React application ☑️ A IaaS client creating complete UI-UX for their new webapp similar to Digital Ocean ☑️ Created a Personal Finances Management app using React Native available on Play Store ... and many more. I'm driven to deliver high-quality design & software products and a well-documented, well-architectured codebase, along with a smooth communication experience. I regularly work with React, NodeJS, TypeScript, Tailwind CSS, Material UI, Figma, Electron, React Native, Solidity, Hardhat, Firebase, Rest APIs and variety of different technologies. We'll be a extremely good fit if - - You have an absolutely killer project that can solve your customer problems - Are looking for a long-term partner who's equally invested in your vision - Are looking for someone who can quickly adapt and learn on-the-fly to solve challenges - Someone who's passionate about technology and solving problems I also like to study about marketing and copywriting and find out ways to combine that with my skills of design and programming. Look forward to work on your awesome project.
    vsuc_fltilesrefresh_TrophyIcon Solidity
    Tailwind CSS
    User Experience Design
    ExpressJS
    Web Design
    Web Application
    React
    MongoDB
    React Native
    Mobile App Design
    Figma
    Blockchain
    Smart Contract
    Node.js
    Ethereum
  • $70 hourly
    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).
    vsuc_fltilesrefresh_TrophyIcon Solidity
    web3.js
    Golang
    React
    JavaScript
    Blockchain
    Blockchain, NFT & Cryptocurrency
    Smart Contract
    Blockchain Development
    Blockchain Security
    Bitcoin
    Web3
    Network Architecture
    Blockchain Architecture
  • $75 hourly
    𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 𝐁𝐥𝐨𝐜𝐤𝐜𝐡𝐚𝐢𝐧 & 𝐀𝐈 𝐄𝐧𝐠𝐢𝐧𝐞𝐞𝐫 𝑾𝒉𝒚 𝒄𝒉𝒐𝒐𝒔𝒆 𝒎𝒆? As a senior software engineer I bring extensive expertise in developing and managing complex blockchain applications. With over 10+ years of experience in the industry, I have honed a diverse skill set in software development using various programming languages and frameworks. My expertise also extends beyond software development to include a thorough understanding of scaling solutions to meet the demands of your business. Professional Services include (but not limited to) the following: 𝐂𝐫𝐲𝐩𝐭𝐨𝐜𝐮𝐫𝐫𝐞𝐧𝐜𝐲 & 𝐁𝐥𝐨𝐜𝐤𝐜𝐡𝐚𝐢𝐧 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: ✅Smart Contract Creation {​​​​​​​​​​​​​​​​​​​ Tokens | NFTs | DAOs | Flash Loan | Arbitrage | and more... }​​​​​​​​​​​​​​​​​​​ ✅NFT Marketplace Development ✅Smart Contract Auditing ✅Decentralized Applications (dApps) ✅EVMs {​​​​​​​​​​​​​​​​​​​ Solidity | Yul | Vyper }​​​​​​​​​​​​​​​​​​​ ✅Parachains {​​​​​​​​​​​​​​​​​​​ Rust | Pact | Substrate| Haskell }​​​​​​​​​​​​​​​​​​​ ✅PyTeal ✅Web3.js 𝐖𝐞𝐛 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: ✅HTML | CSS | JavaScript | PHP | WordPress ✅Web3 JS | React JS | Typescript ✅Database {​​​​​​​​​​​​​​​​​​​ MySQL | PostgreSQL | MongoDB | and more... }​​​​​​​​​​​​​​​​​​​ ✅WooCommerce| Ecommerce 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: ✅Android {​​​​​​​​​​​​​​​​​​​ Java | Kotlin | C++ | C# | Dart }​​​​​​​​​​​​​​​​​​​ ✅iOS {​​​​​​​​​​​​​​​​​​​ Swift | Objective-C }​​​​​​​​​​​​​​​​​​​ ✅Cross-Platform Compatibility ✅Flutter Frameworks 𝐎𝐭𝐡𝐞𝐫: ✅AI Development ✅Dev Ops Support ✅Custom Bot Development ✅Shopify Development ✅WordPress Development ✅Wix Development ✅Technical & Whitepaper Creation ✅Tokenomics Consulting ✅Business Consulting ✅Ongoing Maintenance/Support 𝐌𝐨𝐫𝐞 𝐬𝐞𝐫𝐯𝐢𝐜𝐞𝐬 𝐚𝐫𝐞 𝐨𝐟𝐟𝐞𝐫𝐞𝐝, 𝐩𝐥𝐞𝐚𝐬𝐞 𝐚𝐬𝐤!
    vsuc_fltilesrefresh_TrophyIcon Solidity
    Solana
    Front-End Development
    Next.js
    API Development
    Blockchain
    Web Development
    Rust
    Cryptocurrency
    Smart Contract
    Blockchain, NFT & Cryptocurrency
    DApps
    Ethereum
    Blockchain Development
    React
  • $60 hourly
    I have over 3 years of experience as a Solidity and React.JS developer, 4 years of experience as a Software Engineer, over 10 years of experience in general programming and have Master's degree in Computer Science. I can create multiple custom DEFI solutions and also fork existing ones. Blockchain development is a very complicated and sensitive business and you should choose to work with professionals that develop safe and tested smart contracts. Having an untested and poorly written smart contract can put your users funds in danger and ruin your entire project. Some of the many projects which I've built in the past are: • NFT launches/drops : regular, whitelisted, gasless whitelisting using wallet signatures, Merkle Tree etc. • NFT staking, merging etc. • ERC20 token ICOs: regular, whitelisted, gasless whitelisting • ERC20 tokens with custom specifications: burnable, tax fee on buying/selling etc. • DeFi forks of platforms (Uniswap, Pancakeswap and others) • Creating a bridge for wrapping NFTs and ERC20 tokens between chains • Custom smart contract solutions I am highly capable of building you full custom solutions on Ethereum, Binance Smart Chain, Polygon and many other chains. Other languages I have been coding over the years are: C++, C, Python, Javascript, DevPascal, Java, Kotlin, Rust, Matlab.
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    Next.js
    Blockchain
    Smart Contract
    JavaScript
    React
  • $20 hourly
    ■ Programming languages: Java SE/EE, Spring (MVC,Boot,IOC), JDBC, SQL, Object-Oriented Programming (OOP), JSP,Node,Soldity,Javascript, Angular,React, ■ Web and Mobile Automation tools: Java, Selenium WebDriver, Spring MVC, Maven, TestNG/JUnit, Firebug, Appium, ADB, UIAutomator; ■ Webservers: Tomcat,GlassFish,Oracle WebServer; ■ Good knowledge of Java programing patterns; ■ Performance/Load tools: Jmeter; ■ Test Environments: Local, Grid, BrowserStack, Sauce Labs, AWS Farm Devices, Docker; ■ Web programming languages/technologies: HTML, Angular ,React, CSS, JavaScript, XPath, XML, JSON; ■ IDE: Eclipse; ■ CI: Jenkins(Pipelines); ■ Control version system: GIT, SVN; ■ API: SOAP, REST; ■ Issue/Story Trackers: Jira, Redmine, Track Studio, HPQC, Rally; ■ OS: Windows XP/7/8.1/10, Linux Cent OS/Ubuntu, Android, IOS, (VMware Workstation); ■ MS Office;
    vsuc_fltilesrefresh_TrophyIcon Solidity
    Spring Boot
    Hibernate
    Java Persistence API
    DApps
    Blockchain
    Java
    Ethereum
    Blockchain Architecture
    Node.js
    IBM Blockchain
    web3.js
  • $48 hourly
    Hey! I’m Vitor. I have 15+ years of experience in software engineering. I'm super responsive and fluent in english.
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    ChatGPT
    Chatbot
    web3.js
  • $150 hourly
    Expert Vetted - Top 1% Upwork Freelancers Bringing Your Digital Dreams to Life: Are you in search of a digital alchemist to craft your next spatial computing experience, generative art collection, or a dynamic web application for your startup? Look no further! As a seasoned creative coder and an Expert Vetted freelancer among Upwork's top 1%, I specialise in transforming abstract ideas into captivating web experiences. My focus lies in crafting interaction-driven designs with meticulous attention to animations and details, ensuring an immersive experience that stands out. Why Choose Me for Your Project: Expertise in Interactive and Animated Design: Whether it's a complex spatial computing experience in WebXR or a generative art collection, my skill set is tailored for high-impact, dynamic projects. Commitment to Excellence: Partnering with me means collaborating with a freelancer who not only listens closely to your vision but also proactively seeks innovative solutions to craft sleek, goal-oriented digital products. Proven Track Record: With over 15 years in the field, I have successfully delivered projects ranging from NFT collections to intricate interactive experiences for clients including L'Oréal Paris, Ferrari, MTV, and more. My Specialties Include: Web Development (React, Webflow, Squarespace) Generative Art (p5.js, three.js) Animated 3D Interactive Experiences (three.js, , WebXR, WebGL, GSAP, spline) Spatial Computing & NFT Design, Low Poly 3D Modelling, 3D Animation Emerging AI Tools (ChatGPT API, Midjourney, Stable Diffusion) NFT Landing Pages (Whitelisting and Minting) UX | UI Design (Figma, Sketch) Additional Skills: Expertise in THREE.JS, WebGL, WebXR Proficient in JavaScript, Jquery, React, HTML/CSS Experience with node.js, MongoDB, Moralis, web3.js, ether.js, solidity Get in Touch: Ready to elevate your digital presence? Scroll to the top, click "Invite to Job," and send a brief description of your project. I'm eager to discuss how we can turn your vision into an unforgettable digital reality. ______ AWARDS ✅Webby awards People Choice 2011 - Automotive Category ✅Spike Asia Finalist ✅Webby Awards 2012 Official Honoree ✅Webby Awards 2010 Official Honoree ✅6 FWA SOTD ✅Pubblication on Taschen Web Design Studios 2 ✅Targa Oro per la Pubblicità - interaction design Conferences: ✅Future of Digital - General Assembly / Mashable PRESS ✅Product Hunt ✅Mashable ✅Creativity Online - Naked Espresso ✅Campaign Brief - Peroni Passaggio ✅AmplifyBusiness - The Future of Digital FEATURED BY ✅PSFK ✅Creativity Online ✅Google Creative Sandbox ✅Art Copy and Code ✅SXSW ✅Mumbrella ✅Campaign Brief ✅Arduino blog ✅Hackaday
    vsuc_fltilesrefresh_TrophyIcon Solidity
    WebGL
    Three.js
    P5.JS
    3D Modeling
    Ethereum
    Blockchain
    Digital Art
    Concept Design
    Cryptocurrency
    web3.js
    GUI Design
    Web Development
  • $45 hourly
    Hi! I have 2+ years of experience creating NFTs and ERC20/BEP20 tokens including a fractionally algorithmic stablecoin with liquidity pools and an appropriate incentive structure. I have a degree in Engineering and have prior experience dealing with research level mathematics. If you have the time feel free to checkout my GitHub: github.com/CodeSaint98
    vsuc_fltilesrefresh_TrophyIcon Solidity
    Front-End Development
    DApps
    Cryptocurrency
    Docker
    Node.js
    Ethereum
    Rust
    API
  • $100 hourly
    I am a C++/C#/Py/Rust/Solidity software architect/developer with 15+ years of experience in development -HFT ultra-low-latency cross-brokers, cross-platform multi-asset algorithmic tools based on QuickFix/Fix8/Onix engines and custom protocols. -BETTING real-time custom pre-match, in-play, play-by-play algorithmic software and historical backtesting-strategies for Betfair,Betdaq. -Financial Ethereum, Polygon, BSC and Solana tools and smart contracts for DeFi ecosystem. Web3 front-running and statistical tools, Defi arbitrage systems.
    vsuc_fltilesrefresh_TrophyIcon Solidity
    ChatGPT
    API Integration
    Uniswap
    Financial Analysis
    MQL 4
    Financial Modeling
    Forex Trading
    QuickFIX
    Betfair
    Financial Statement Software
    Smart Contract
    web3.js
    Ethereum
    Blockchain
  • $111 hourly
    ✅Frontend: HTML, CSS, JS, TS, React, Vue, Svelte, Web3 ✅Backend: Solidity, Rust, Golang, Python, Node ✅Protocol: Solidity, Anchor, Hardhat, Foundry Software developer that enjoys tackling interesting challenges, designing novel solutions and problem solving.
    vsuc_fltilesrefresh_TrophyIcon Solidity
    Ethereum
    Rust
    web3.js
    Golang
    Python
    Node.js
    Smart Contract
    React
    Linux
    Digital Marketing
    MQTT
    Vue.js
    DApps
  • $60 hourly
    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.
    vsuc_fltilesrefresh_TrophyIcon Solidity
    Blockchain Development
    Blockchain Architecture
    Blockchain
    web3.js
    Smart Contract
    DApps
    React
  • $110 hourly
    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 (:
    vsuc_fltilesrefresh_TrophyIcon Solidity
    Blockchain Development
    Blockchain Architecture
    Rust
    C
    Database
    DevOps
    DApps
    Website Prototyping
    Cryptocurrency
    Smart Contract
    Bot Development
    Data Scraping
    Python
    JavaScript
  • $25 hourly
    Frontend Development (MERN Stack): HTML5, CSS3, JavaScript (ES6+) ReactJS, Redux, Next.js Responsive design principles and mobile-first approach Client-side routing with React Router State management with Redux or Context API UI component libraries such as Material-UI, Bootstrap Frontend performance optimization techniques Backend Development (MERN Stack): Node.js, Express.js MongoDB, Mongoose.js RESTful API design and development Authentication and authorization using JWT, OAuth Express middleware for request handling and validation Data modeling, querying, and indexing in MongoDB Server-side caching strategies Blockchain Development: Ethereum, Solidity Smart contract development and deployment Interaction with blockchain networks using Web3.js or Ethers.js Token creation (ERC-20, ERC-721, ERC-1155) Blockchain integration into applications for decentralized features Understanding of blockchain consensus mechanisms Experience with decentralized finance (DeFi) protocols Payment Gateway Integration: Integration of payment gateways such as Stripe, PayPal, or Braintree Handling payment transactions securely using APIs Implementation of subscription-based billing systems PCI compliance and secure payment processing Handling refunds, disputes, and chargebacks GraphQL: Schema design and resolvers implementation Query, mutation, and subscription operations Apollo Client for frontend GraphQL integration Optimizing GraphQL queries for performance Authentication and authorization in GraphQL APIs WebRTC (Real-Time Communication): WebRTC API for peer-to-peer communication Implementing video/audio chat applications Signaling protocols (e.g., WebSocket) for establishing connections NAT traversal and STUN/TURN server configuration Handling real-time data streams efficiently DevOps and Deployment: Docker containerization for application deployment Continuous integration and deployment (CI/CD) pipelines Cloud platforms such as AWS, Azure, or Google Cloud Platform Infrastructure as Code (IaC) using tools like Terraform Monitoring and logging solutions (e.g., Prometheus, ELK stack) Other Skills: Version control with Git and GitHub/GitLab Testing frameworks like Jest, Mocha, Chai Agile methodologies and project management tools Collaborative problem-solving and communication skills Strong troubleshooting and debugging abilities
    vsuc_fltilesrefresh_TrophyIcon Solidity
    AWS Amplify
    Microservice
    MERN Stack
    Front-End Development
    AWS Lambda
    RESTful Architecture
    Google Cloud Platform
    DApps
    GraphQL
    web3.js
    TypeScript
    JavaScript
    Ethereum
  • $112 hourly
    Why should you choose me: ✅ Top 1% talent on Upwork: I'm part of the proud Expert Vetted Talent pool with earnings 400K plus helping Enterprises and Businesses. My Company Services - sarsoftwareinc.com I am currently working as a BlockChain/NFT/Web3 Engineer, Full Stack developer and Cloud Data / Solution Architect in US. Also I have developed several AI and openAI chatGPT models using custom ML and deep learning algorithms and integrated them with websites, mobile, and desktop apps. I have also recorded chatGPT prompts and conversations and used those data for conversational data analytics also forwarded the responses to API and saved them to the cloud database. Also got great experience in building cloud AI chatbots using Vicuna , AWS Lex and Dialogflow. ChatGPT Portfolio: 1. bank-webapp-front-end-service.azurewebsites.net With 20 years plus in Total IT Experience , Recently the Blockchain and Web3 development space has become very interesting for me for the last 3 years, I've worked mainly on Blockchain , Ethereum, FLOW, Solana , NFT and Web3 related projects with great professional experience in Solidity, RUST, C++ programming language, token generation, digital currency exchange, proof of work (POW), and building innovative, highly customized, robust, feature-packed, and modular blockchain development solutions. I also have more than 7 plus years of experience with Artificial Intelligence, Machine Learning , Computer Vision, Cognitive Services using Python, AWS, MS Azure Machine Learning , Google Cloud Platform and Amazon SageMaker. Build and train custom data using openAI chatGPT models with Q & A ,summarization features. My work history includes top clients (Google) ranging from start-ups to Fortune 500. Many of the teams are distributed across continents, so I am comfortable working both locally and in international, distributed settings. Currently, I am a member of Upwork Talent Enterprise Clouds in which my clients regularly access my services for innovation and architect new and profitable solutions. My main skills are: - AI Tools - ChatGPT , RAG , OpenAI , Generative AI , LangChain , LLM, Pinecone , Vicuna , Llama2 , BARD , Vertex AI , Vector Embedding Languages: Python, Solidity , Cadence, Rust , C++ Blockchain and Web3 Development - Web3.js , Node.js , React , Truffle , Ganache , MetaMask Smart-contract integration development: DeFi platforms,, Crypto wallets, NFT Marketplaces Blockchain: Ethereum (ETH) and Binance Smart Chain (BSC), FLOW , Solana, Avalanche Tokens, smart-contract dApps and Blockchain Consulting and dApps Development NLP: NLTK, Spacy Devops : Docker , Kubernetes , Kubeflow NLP Apps : Rasa Chatbot, Amazon Lex , Kendra Cloud Platform : AWS , Azure , GCP Automation - Power Automate , Blockchain projects: 1. stakingsolana.sarsoftwareinc.com 2. sarsoftwareinc.com/blockchain 3. samedaypay.io NFT Marketplace: 1. bopoverse.com 2. gmdynasty.com 3. lostboy.io Past Web Projects: 1. analogix.com 2. bitsecure.co 3. investonmainstreet.com 4. poshberry.com 5. apenft.io 6. theroomxchange.com 7. theaxleworkout.com 8. theshade.com.au 9. tortugasbayresort.com Also, note that I offer more favorable hourly rates for longer-term projects and for retainer consulting. Please inquire, and I will send you a document that has all the details about my consulting rates.
    vsuc_fltilesrefresh_TrophyIcon Solidity
    web3.js
    Ethereum
    Rust
    Node.js
    Smart Contract
    Blockchain
    Solution Architecture
    React
    Truffle
    Microsoft Azure
    Google Cloud Platform
    Chief Architect
    Data Science
    Python
  • $40 hourly
    I'm an upscale developer/system architect with a deep focus on blockchain technology. I use Solidity & Rust for smart contracts, Golang and Node.js for the Backend, and React.js for the Frontend. My background covers a broad range of web3 solutions in various industries. - Core blockchain development - ERC20 Tokens and Coins development - Metaverse technologies - Smart contracts and decentralized applications (dApps) - DeFi platforms - NFT implementations - DEXes and CEXes - Trading bots and platforms - DAOs - Layer 2 solutions - Multi-chain bridges, migrations of tokens - Privacy-focused blockchain projects - Consensus algorithms - Oracles and data feeds - Blockchain security and auditing I specialize in projects based on Ethereum, BSC, and other EVM-compatible blockchains, as well as Solana, Polygon, Avalanche, and more. I have an outstanding reputation for consistently delivering high-quality work to my clients, and I'm recognized for my reliability and unwavering commitment to project success.
    vsuc_fltilesrefresh_TrophyIcon Solidity
    Blockchain
    Web3
    DeFi
    Layer 2 Blockchain
    NFT
    DApps
    Rust
    Smart Contract
    React
    Blockchain, NFT & Cryptocurrency
    Cryptocurrency
    Node.js
    Golang
    Blockchain Development
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