Name: Smart Contracts developers
Brand: Upwork
Rating: 4.8 (159 reviews)

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Clients rate Smart Contracts developers

4.8/5

based on 159 client reviews

$75 hourly
- 5.0/5
- (27 jobs)
Top-rated expert full-stack software engineer and architect focused on Node.js, Python, AWS serverless stack, software architecture, database design and optimization, CI/CD, DevOps. I help early-stage startups and growing firms build their products Programming: Python, TypeScript/JavaScript, Node.js, Shell Frameworks: Django, Nest.js, React, Express Databases: PostgreSQL, MySQL, DynamoDB, Timestream, MongoDB AWS: Lambda, API Gateway, EC2, ECS, RDS, SQS, SNS, S3, Route53, Redshift, CloudWatch, Serverless, etc. DevOps: CloudFormation, SAM, Terraform, CodePipeline, GitHub Actions, CI/CD Blockchain: Ethereum, Algorand, PyTEAL, DeFi, Hyperledger Indy/Aries, Self-Sovereign Identity Containers: Docker, Docker Compose, ECS, Kubernetes Analytics, BI: Qlik, Tableau, Fine BI, Power BI Other: Software Architecture, Stripe payments, Stock/options trading Highly proficient in FinTech, DeFi and financial services

Smart Contracts
Requirements Specification
Algorand
Amazon Web Services
Agile Software Development
Capital Markets
API
Smart Contract
Blockchain
Cloud Computing
Python
Serverless Stack
SaaS
AWS Lambda
FinTech
Software Architecture & Design
FinTech Consulting
Node.js
$60 hourly
- 4.9/5
- (16 jobs)
Software Engineer with a crazy obsession for the next big gadget on the market. I find daunting problems fun and entertaining in my fast-paced mind. Finding new technologies always excites me and I find it so amazing that there are always new ones coming out every day. I have a passion to teach new people age them to continue working hard every day. Programming Languages : Python, Rust, C++, Javascript (Node), Typescript AI/ML : OpenAI, GPT3.5, 4, LLM Automation Tools: Zapier, Make.com API building: gRPC, GraphQL, REST, SOAP. DevOps : Docker, Kubernetes, Ansible, Web servers Administration Web App Frameworks (MVC) : Django, Flask, Actix Web, Rocket Specialties: Big Data : pySPARK, Dask, Hadoop JavaScript Libraries : React RDBMS : PostgresSQL, MySQL, Oracle NoSQL : MongoDB, Redis Operating Systems : RedHat ( like ) Linux Administraton , Ubuntu GNU/Linux, Version Control : GIT, Perforce, Github, Gitlab Blockchain: Solana, Neutron, CosmWasm Thank you!

Smart Contracts
D3.js
AWS Systems Manager
Blockchain
Smart Contract
Svelte
React
Angular
TypeScript
Web3
Vue.js
Solidity
Node.js
Three.js
$75 hourly
- 4.9/5
- (94 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.

Smart Contracts
Solana
Front-End Development
Next.js
API Development
Solidity
Blockchain
Web Development
Rust
Cryptocurrency
Smart Contract
Blockchain, NFT & Cryptocurrency
DApps
Ethereum
Blockchain Development
React
$50 hourly
- 5.0/5
- (3 jobs)
As a UT CS alumnus who is passionate about learning different technologies and getting self-started, I've worked on a lot of cool projects in various industries with professional team members. Started learning programming with C/C++ and took part in a large-scale web project as a back-end Java developer during university. While working on many productive projects, Javascript became the biggest point and I also had valuable experience in other programming languages, frameworks and related technologies. Currently, Web3 has sucked me in and I really enjoy building dApps and Smart Contracts on top of EVM-based and Solana networks. Providing good solutions and building infrastructures of projects including database design are my other proud skills. And I never shy away from asking or learning new technologies. Looking forward to exciting opportunities, working in a fast paced environment, and fostering a strong relationship with all of my clients.

Smart Contracts
ASP.NET
Spring Framework
Web Scraping
PostgreSQL
NestJS
React
Solana
DeFi
Rust
web3.js
Solidity
Smart Contract
Python
TypeScript
JavaScript
$50 hourly
- 5.0/5
- (6 jobs)
Software Architect with over 8+ years of extensive experience in software development, more than half of that worked as a Team/Tech Leader. Has experience in creating scalable high-performing platforms and understanding their behaviors and bottlenecks. Available 24/7 for Zoom/google meetings to discuss your projects in detail. Brief summary: -8+ years of professional experience in web development, Blockchain, Web3, Smart Contract, Ethereum, Rust - Highly skilled in technical architecture design for high-loaded products - Always willing to provide my suggestions related to product improvements - Follow best practices, creative and responsible - Strong organizational and problem-solving skills - Great experience of teamwork and team lead - Excellent skills in working under pressure and tight deadlines IT SKILLS -Blockchain: Web3, Solidity, Ethereum, Binance, Smart Contract, Cryptocurrency, Bitcoin, Fork, bot, BTC, EMC, Solana, ERC-20, ERC-721, ERC-1155, BSC, ETH, NFT, DeFi, Fintech, Metamask, API, Framework, Creating forks, token smart contract audit, cryptocurrency exchanges, integration with blockchain, smart contracts, coins, tokens, web3.js, uni swap, CeFi, GameFi, WAX, ICO, IDO. -Back-end stack: Node.js + NPM/YARN, PostgreSQL, ElasticSearch, Redis, MySQL, MongoDB -Front-end stack: JS ES5/ES6, HTML5, CSS3, SASS/LESS, XSLT, React, Angular, Vue, Tailwind, React Bootstrap, Bootstrap -AWS: EC2, ElasticCache, SQS, S3, Redshift, RDS, Lambda Libraries/FW: Express, Koa -Proxy server: Nginx -Task runner: Grunt, Bower -Module bundler: Webpack -BDD/TDD: Jasmine, Phantomjs, Mocha/Sinon/Chai ALM Tools: Jira + Confluence, Redmine, AWS, -Heroku CI/CD: Jenkins, TeamCity, Docker Most Recent Projects: Project Name: Arm NFT Description: NFT platform based on Solana with RUST. Technologies: RUST, Blockchain Web Url: arm.kryptomind.net ------------------------------------------------------------- Project Name: DUNK NFT Description: ETH based. Technologies: Solidity, React JS, Blockchain Web Url: dunk.kryptomind.net ------------------------------------------------------------- If you are looking for a reliable, creative, and experienced IT professional, you have come to the right place. I will eagerly become your longtime partner. Let's start to work together! Keywords: Blockchain, mint website, polygon, open-sea, metadata, rust, discord, ERC20, ERC721, dex, cex, smart contract, chatbot, GPT, ChatGPT, ChapGPT 3, ChatpGPT 4, Trading bot, nft, token, Ethereum, crypto, bitcoin, web3, dapp, solidity, crypto website, cryptocurrency, nft website, bep20, ui ux, nft website design, white paper, web3 dapp, whitepaper, smart contract audit, defi, Metaverse, contract, nft mint, bep20 token, erc20 token, Python, cross-chain, fork, responsive design, wallet app, cryptocurrency, web3 developer, blockchain developer, nft collection, white paper, beautiful soap, scrapy, selenium

Smart Contracts
Machine Learning
FinTech
Smart Contract
LLM Prompt
DApps
DeFi
NFT Marketplace
Chatbot
Rust
Solidity
React
Ethereum
Blockchain
Python
$50 hourly
- 5.0/5
- (16 jobs)
I am a professional Webflow developer in Houston, Texas. My Experience: ✅ Webflow expert: I am Webflow certified and have worked on over 100 sites. ✅ Easy communication - Based in Houston, central time zone. ✅ Figma expert: I can design and work from Figma wireframes, site designs, and prototypes. ✅ Custom code: HTML, CSS, and JavaScript is no problem. ✅ Integrations: GA-4, Tag Manager, Google Search Console, Meta Pixel, custom embeds, etc. ✅ Client First Framework: Using Client First? (You should.) I'm a Client First expert. ✅ Chief Marketing Officer: I am a full-time and fractional CMO and provide strategy advising. ✅ Tools & Partners: Relume, F*inSweet Attributes, Wized, Memberstack, etc. What I do: 👍 Webflow custom builds 👍 Webflow template updates 👍 Webflow integrations 👍 Webflow refactors into Client First Let's go! Thomas

Smart Contracts
Rust
Solidity
Smart Contract
NFT
Blockchain Architecture
Ethereum
Blockchain
Initial Coin Offering
NFT Minting
DApp Development
NFT Marketplace
DeFi
NFT Collection Generation
Tokenomics
NFT Metadata
$80 hourly
- 5.0/5
- (6 jobs)
Web3 developer focused on NFTs, defi, and sustainable crypto ecosystems. I've been an entrepreneur for most of my life. I love blockchain and believe it will have a positive impact on the world, creating greater transparency and equality. I've been working on a personal project called Wizard Army DAO that uses a smart-contract ecosystem to create a fair, collaborative workforce.

Smart Contracts
Unix Shell
Linux
React
DApp Development
NFT Minting
NFT
Smart Contract Development
Solidity
Telegram
Web3
Smart Contract
Flask
Docker
TypeScript
Python
$35 hourly
- 4.9/5
- (9 jobs)
👋 With over 8 years of experience, I'm a Senior Full Stack Engineer passionate about delivering complete, high-performance solutions across industries like Ecommerce, Fintech, and Blockchain. I specialize in building MVPs for startups, leveraging the latest technologies in React, Node.js, and blockchain platforms like Ethereum (ETH) and Solana (SOL). Let's collaborate to create powerful digital products and seamless Telegram bot integrations that leave a lasting impact! ✅ Building responsive and interactive frontends using HTML, CSS, JavaScript, and TypeScript with frameworks like React and Next.js ✅ Designing robust backend systems with Node.js, Express.js, and NestJS for scalable and maintainable applications ✅ Creating and connecting APIs using RESTful services and GraphQL for smooth data communication ✅ Managing and optimizing databases like MongoDB, PostgreSQL, and MySQL with tools like Prisma, Sequelize, and Mongoose ✅ Implementing secure user authentication with Passport.js, JWT, and Bcrypt to protect sensitive data ✅ Developing and deploying blockchain-based solutions on platforms like Ethereum (ETH) and Solana (SOL), integrating with decentralized applications (dApps) ✅ Integrating Telegram bots with backend systems and blockchain platforms to enhance user interaction and automation ✅ Designing and deploying cloud-based applications with serverless technologies on AWS and other cloud platforms for scalable solutions

Smart Contracts
Truffle
DApp Development
DApps
Smart Contract
Mining Pool
Rust
Solidity
Blockchain
Telegram
Solana
Ethereum
Node.js
API Development
React
Angular
$45 hourly
- 5.0/5
- (3 jobs)
Hello! My name is Nam and I am a senior full-stack developer with 8 years of experience in the field. I'm a developer with experience in building and deploying applications end-to-end. From front-end, to back-end, including database, user experience and interface, cloud architecture, test automation, etc. It doesn't matter the kind of requirement, problem that needs to be solved, or an entire project up and running, you can count on me. Portfolio: 1. ARKivist: This plug-and-play WebAR platform for brands was featured in Forbes and Yahoo News. 2. Arora (#MakeUsVisible): This WebAR digital art platform and campaign reimagining public landscapes was showcased in NYC, Munich, Worms and GOOGLE I/O 2023. 3. Pollinate Art (fine art listing): Featured in Forbes & HYPEART 4. F3RN (web3 curation): Built on Lens Protocol 5. Blackbeard: Web3 scavenger game My skills including such as: - Javascript, Angular.js, Node.js, React.js, Redux, TypeScript, Tailwind CSS - Python / Django - MySQL, PostgreSQL, MongoDB - HTML5, CSS3, LESS, SASS, Bootstrap 3/4 - JSON, XML, REST API, Google API, AWS, Social APIs Thank you for considering my profile. I look forward to discussing your project in more detail.

Smart Contracts
Smart Contract
Firebase
Next.js
Tailwind CSS
Django
React Native
PostgreSQL
AngularJS
Core Java
Python
Java
Node.js
React
Web3
Blockchain
$60 hourly
- 5.0/5
- (3 jobs)
I'm a highly regarded Full-Stack Software Engineer with expertise in a wide range of cutting-edge tools and technologies, so you can be sure that your projects will be completed to the highest standard. My primary areas of competence are: **Blockchain Development**: Proficiency in Web3, Foundry, Hardhat, Solidity, and Smart Contract Audits. Proficient in Rust and Solana to provide safe, expandable solutions. knowledgeable about Anchor and Token 2022 requirements. - **Decentralized Finance (DeFi)**: thorough understanding of trading platforms, Forex markets, and NFT construction. competent in Python, C++, C#, and MT4 for smooth financial applications. - **Advanced Blockchain Architecture**: Skilled in Cosmos, Go, and Rust to create reliable blockchain systems. - **Web Development**: Proficiency in the latest web technologies, such as React, Express, MongoDB, and Node.js, to build responsive, dynamic websites. **Machine Learning and Artificial Intelligence**: competent in building AI systems with TensorFlow and ChatGPT, and well-versed in Python for complex AI applications. A Full-Stack Software Engineer that combines in-depth technical expertise with a dedication to excellence can maximize the potential of your project.

Smart Contracts
Blockchain Architecture
MetaTrader 4
Forex Trading
NFT
Blockchain Tokenization
Solana
Hardhat
Cloud Foundry
Web3
Smart Contract
Solidity
Python
C++
C#
Rust
$40 hourly
- 4.6/5
- (3 jobs)
With 10 years of experience as a Full Stack Developer, I’ve been around the block a few times (and probably rebuilt it with React). I specialize in building dynamic, scalable websites and Web3 solutions that not only look great but also work flawlessly behind the scenes. Whether you need a slick CMS, smooth blockchain integration, or just a website that doesn’t crash after three clicks, I’ve got you covered. UI/UX? Not just buzzwords to me. I ensure your users enjoy every second of their experience—without wanting to throw their devices out the window. Let’s create something that not only makes your business shine but also has the potential to win a design award or two!

Smart Contracts
Smart Contract
Web3
Rust
Solidity
DeFi
DApp Development
Solana
Ethereum
Blockchain Platform
Desktop Application
Blockchain Architecture
React
JavaScript
iOS Development
Android App Development
$44 hourly
- 5.0/5
- (4 jobs)
As a Web3 and AI engineer, I love working with the latest technology to solve real-world problems. I specialize in creating smart contracts and decentralized apps (dApps) that not only work smoothly but also give users a great experience. Picture a system where your transactions are as safe as a vault, and using the app feels as natural as talking to a friend. That’s the kind of world I aim to build. By using blockchain technology, I create strong and reliable solutions for finance, digital assets, and more, always ensuring trust and transparency. Beyond blockchain, I also bring artificial intelligence into my projects. I develop intelligent chatbots that can predict user needs and automate repetitive tasks, making life simpler and more efficient. Whether you need a smart contract to drive your business or a dApp that grabs users’ attention, I’m here to make your ideas a reality. Let’s work together to create something unique that stands out in the digital world! Key Technical Skills - Smart Contract Development: Proficient in Rust (Solana) and Solidity (Ethereum) for building and optimizing secure, scalable smart contracts. - Blockchain Architecture: Deep understanding of consensus mechanisms (Proof of Stake, Proof of History), staking, and decentralized protocols. - AI Integration: Implementing machine learning models and natural language processing (NLP) systems for predictive analysis and automation. - API Design & Integration: Designing RESTful and GraphQL APIs, ensuring smooth data flow between applications and blockchain networks. - Full-Stack Web Development: Expertise in MERN stack (MongoDB, Express, React, Node.js) for building dynamic, responsive web applications. - DeFi & dApps: Experience with decentralized finance (DeFi) protocols, developing user-centric dApps, and ensuring security in smart contracts.

Smart Contracts
Natural Language Processing
Machine Learning
OpenAI API
Bot Development
Telegram API
DApps
Blockchain
Solidity
Rust
Smart Contract
$80 hourly
- 5.0/5
- (4 jobs)
Hello. I'm a blockchain developer with 8 years of hands-on experience. I specialize in a variety of blockchain technologies, including Ethereum, Solana, and Cosmos, alongside the complexities of Web3. My focus is on delivering innovative solutions across DeFi, DEXs, crypto bridges between blockchains, NFTs, and many other DApps. During my professional journey, I've played a key role in bringing ideas to life, building, and launching different kinds of blockchain-related projects. These include online trading spaces, unique digital currencies, reward-giving platforms, connectors between multiple blockchains, and interactive gaming experiences. My work has been consistently praised by clients for being creative and dependable. - Professional Blockchain Development Services As a seasoned blockchain developer with a robust 6 years of experience, I have cultivated a deep expertise in an array of blockchain technologies including Ethereum, Solana, Cosmos, and the intricate workings of Web3. My specialization lies in crafting cutting-edge solutions across DeFi, DEXs, Bridges, NFTs, and other decentralized applications (DApps). I have played a pivotal role in the conceptualization, development, and deployment of various blockchain projects such as marketplaces, meme coins, staking platforms, cross-chain bridges, and game mechanics. My work has consistently received positive feedback from clients for its creativity and reliability. - My Professional Service Offerings Include: • Web3 Wallet Integration: Including but not limited to Metamask, Trust Wallet, Uniswap, Xverse, Hashpack, Xumm, Gem Wallet, Keplr, Leap Wallet, Cosmostation Wallet, Station Wallet, Crossmark Wallet. • Token Development: Presale, ICO, IDO, Staking, Launchpad, Token Smart Contract, Meme Coin, Token Landing Page, 18+ Token Bots Package • NFT Solutions: Tailored services ranging from NFT minting websites to NFT staking, raffles, launchpads, marketplaces, integration with Bitcoin Ordinals, presale and public minting events, IPFS storage solutions, NFT dashboards, and Opensea functionality. • DeFi & DApp Development: Offering comprehensive creation of tokens, meme coins, ICOs, IDOs, token presales, coin listings, cryptocurrency creation, token staking, launchpads, swaps, cross-chain bridges, DEXs, CEXs, AMMs, along with Pancake Swap and Uniswap integrations. • Web3 Gaming Platforms: P2E games, Coinflip, and expansive metaverse experiences. • Smart Contract Auditing: Audit of source code, issue resolution, and smart contract verification on block explorers. • Bot Development: Volume traffic bots, holder maker bots, trending bots on dexscreener and dextools, and new token notification bots. - Supported Networks/Blockchains: Bitcoin (ordinal, rune), Ethereum, Solana, Base, BSC, Polygon, Tron, other EVM chains, Cosmos, XRPL, Cardano, Fantom, Polygon, zkSync, Hedera, Aptos, Injective, TON, and more. - My Commitment to You: • Guaranteed Satisfaction: Ensuring that your expectations are not just met, but exceeded. • Quality Workmanship: Delivering top-tier results through meticulous attention to detail. • Security Assurance: Prioritizing the safety and integrity of your project at every phase. • Effective Communication: Maintaining clarity and understanding throughout our collaboration. - Programming Languages and Technologies: • Proficient in Web3.js, Solidity, Rust, FunC, Smart Contract development, Rust, Node.js, and React.

Smart Contracts
Web3
Bitcoin
Smart Contract
Rust
Solana
Ethereum
Solidity
Blockchain
Node.js
React
$50 hourly
- 5.0/5
- (33 jobs)
Hello! I'm Andrew, and I specialize in web development and digital business transformation. With a decade of experience, I've learned how to seamlessly integrate two key aspects of business - creating e-commerce stores and automating processes - into a unified, harmonious approach. My Expertise: On one hand, I specialize in e-commerce development, where my projects range from complex online stores with a vast product range to allowing users to customize products through 3D configurators. On the other hand, I assist businesses in digitizing and automating their processes. This includes inventory tracking, task management for employees, equipment and transportation monitoring, financial tracking, integration of bots for customer and staff interaction, as well as the utilization of artificial intelligence for document processing and content creation. What I Offer: My primary goal is to develop products that help you manage your business more efficiently by providing all the necessary analytics and statistics in one place. My Tools: For creating e-commerce solutions, I use Shopify and WooCommerce. For automation, I leverage Python, PHP, React, and React Native.

Smart Contracts
Webflow
WooCommerce
WordPress
Shopify
Python
ChatGPT
Blockchain
JavaScript
Machine Learning
React
Web Application
Solidity
Smart Contract
Ecommerce Website Development
PHP
$50 hourly
- 4.6/5
- (32 jobs)
🛠️💻🖥️👨‍💻👨‍🎓 Hey, I'm Jay! I solve problems. | jaymath.is | github.com/mathiscode | | ecmaos.sh | aige.games | intellibrix.dev | imagined.quest | whogoverns.me | luna.moonlander.studio | **NOTE: I had Top Rated Plus status for years, however since I have been working fewer hours and for smaller clients, my account doesn't currently meet the "large contracts" threshold according to Upwork, so I have dropped back to simply Top Rated status** **NOTE: Although I have an Upwork "agency", I am the only member - I do not outsource any work and I charge my normal rate** [CORE BELIEFS] - I'm clear and honest in my business; I don't do shady things to risk my reputation - I strive to provide high value; I try to pack as much value to clients in as little time as possible - Cooperative vision makes good products; the client has the final say, but I believe in sharing ideas - Continuing education is crucial; I try to keep up with technology so I can provide the best results possible - I don't withhold knowledge; I want my clients to understand their codebase as much as they're comfortable - Reasonable response times; a common problem with certain freelancers is they disappear - I won't [EDUCATION] - Western Governors University, Bachelor of Science, Software Development - Obsession that started with BASIC on the TRS-80 in 1992 [CERTIFICATIONS] - CIW User Interface Designer - CIW Site Development Associate - CIW Advanced HTML5 & CSS3 Specialist - CompTIA A+ - CompTIA Project+ - ITIL v4 Foundation [SOLO PROJECTS] - AIGE; AI Game Engine (aige.games) - Intellibrix; a software component framework that uses self-contained AI-powered Bricks (intellibrix.dev) - AI Kernel Explorer; a TUI to browse AI-generated summaries of the Linux source tree - Web3os; a browser-based experimental operating system (web3os.sh) - Imagined Quest; an AI-powered text-adventure game (imagined.quest) - WhoGovernsMe; a website to view information about political representatives (whogoverns.me) - Moonlander Luna; a React dApp boilerplate application (luna.moonlander.studio) - See more in my portfolio [CLIENTS] - BeyondCAD.com - Sizle.io - DatasheetSolutions.com - Design Emporium, LLC - National Young Farmer's Coalition - Cybersemics Institute - Politarian.com - JewishMusic.fm - NFTWorld.io - MetaverseChat.io - See more in my reviews/testimonials [HIGHLIGHTS] - 25 years Linux experience - 20 years HTML/CSS/Javascript experience - (to include vanilla, Typescript, Node.js, Deno, React, Vue, Svelte, Angular, jQuery, and other frameworks/libraries) - 15 years database experience - (to include MySQL, SQLite, Postgres, MongoDB, CouchDB, Redis, Firebase Firestore/RTDB, and other database technologies) - 15 years API integration experience - (to include REST, SOAP, GraphQL, and other API technologies) - 15 years PHP experience - (including CMS such as Wordpress, Concrete5, Drupal, and Joomla) [DEVOPS] - AWS - Digital Ocean - Heroku - Google Cloud - Firebase/Supabase/Pocketbase - Vercel - Netlify - Fleek - Hostgator, Bluehost, Siteground, miscellaneous shared/VPS/dedicated providers [MY DIFFERENCE] My business is solving your problems. I bring a diverse set of skills to manage nearly any IT problem. I don't claim to know everything, but I've always been tenacious and I won't stop until I figure it out. Hiring a developer can be a gamble sometimes if you're not careful - low-cost developers entice potential clients with low budgets and promising they can do anything. What they're after is just the job, not necessarily making your project succeed. If a freelancer charges a low rate and seems to have plenty of time available, there's probably a reason. A good freelancer will be upfront if something is outside of their skillset or if they can't fit the project in their schedule, and is careful not to overpromise. Wasting a client's time and money to deliver low-quality results isn't a sustainable business. If your project uses some technology I'm unfamiliar with, I generally don't charge for the time spent educating myself on it. I like learning new things, and it may be useful to know in the future. Whether you need a brand new application, bugfixing/refactoring a legacy codebase, website/CMS management, Linux/Windows server administration, or anything else involving software, check out my profile details and my portfolio of work to see if I might be a good addition to your project! [NOTICES] - I am happy to sign an NDA for your project if required! - I'm a native English speaker, if you consider what the southern states speak to be English 😅

Smart Contracts
ChatGPT
PHP
WordPress
Blockchain
web3.js
MongoDB
Node.js
React
ExpressJS
Material Design
Web Design
Solidity
JavaScript
React Native
Smart Contract
$155 hourly
- 4.7/5
- (28 jobs)
**EXPERT VETTED BY UPWORK** Top 1% in AI/ML,data warehousing and Flutter I lead a small talented team of AI/ML and Flutter engineers. So instead of getting one expert on your team, you will always get a team of experts. Executing greenfield projects is something that we enjoy! I guarantee you: My team will provide the best value that you can find. Example Projects that we can execute: *Design and execute an original research project in machine learning or AI *Development of an AI strategy for your organization *Development of custom AI/machine learning solutions, including custom neural networks implemented in Python (TensorFlow, PyTorch, OpenCV, numpy) *Development of natural language processing solutions for text generation, classification, and business workflows, including large language models such as OpenAI's ChatGPT and Claude *Development of computer vision solutions for image classification, object detection, segmentation, and more, leveraging 2D images, 3D images, video, natural images, satellite images Why work with me: - My DC-based company Oaktreeapps.com is a data-first dev shop using bleeding edge tech stack. - Have successfully launched projects for companies like PGA, Sweetwater, Berbix and Federal agencies. - Currently serve as a CTO for a Techstars backed startup. - AWS certified team for all things dev-ops. We are a team with decades of experience working on: || Enterprise grade mobile apps || AI/ML || Data warehousing 1. Enterprise grade apps 2. Social media apps 3. Multimedia consumption apps 4. Connected car apps 5. Healthcare apps 6. Hyperlocal apps Data warehousing tools we use: || Snowflake, Apache Superset , LLM || Web 2.0 tools we use: 1. MERN stack 2. Flutter/Dart for cross-platform mobile development 3. Snowflake, AWS, Apache Superset 4. In house LLM models that can be used for proprietary data processing We understand that finding the right candidate for the job can be tedious and stressful. That's why when you choose to work with us, we shall make things as simple and easy as possible, striving hard to provide you with a 100% stress-free experience. Let's have a chat about your product needs, and let us help you grow your business. Thank you!

Smart Contracts
React
Node.js
Swift
Apple Xcode
Android
MongoDB
Ethereum
Kotlin
Vue.js
Blockchain Development
Blockchain
Smart Contract
Flutter
AWS Server Migration
$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

Smart Contracts
Front-End Development
GraphQL
Tailwind CSS
Next.js
React
React Native
Web Development
Blockchain
Web3
Solidity
web3.js
Smart Contract
Ethereum
TypeScript
JavaScript
$111 hourly
- 4.8/5
- (69 jobs)
✅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.

Smart Contracts
Ethereum
Rust
web3.js
Golang
Python
Node.js
Smart Contract
Solidity
React
Linux
Digital Marketing
MQTT
Vue.js
DApps
$50 hourly
- 4.2/5
- (24 jobs)
What Can I Deliver? Imagine a business where manual tasks become automated magic. That's my specialty. I craft bespoke solutions that streamline your operations, liberating your team to focus on expansion and innovation. My Proven Impact: My track record is built on hundreds of hours saved and millions of dollars cut from clients bottom line. Results speak volumes, and I'm all about delivering tangible benefits. Recent Ventures: Here's a snapshot of my recent projects, message me to see more or view my profile to watch the demo videos for these projects. -Indeed WebScraper: Automatically scrapes qualified jobs, creates a cover letter using ChatGPT, submits applications and even by-passes 2-factor authentication hurdles. -Facebook Group WebScraper: Harvesting essential insights, leads and more from Facebook groups. -Automated UpWork Lead Gen. Software: Empowering agency owners to tap into UpWork effectively. -Gmail Inbox Organizer: Using AI and Natural Language Processing this software automatically categorizes email inbox, finds and blocks spammers and highlights important emails in real-time. Why Me? As a Marketing Automation Specialist for a leading software firm, I bring proven expertise to the table in the realm of automating systems and workflows. I'm your go-to resource for creating custom automations that save time and money for you or your business. Let's partner up to navigate the rapidly evolving industry together. With my skills and your vision, we can actualize your objectives by conjuring a bit of automation magic within your business, bringing your goals to reality. Contact Me Today!

Smart Contracts
Google Apps Script
Make.com
Zapier
B2B Lead Generation
Azure Blockchain Service
Email Deliverability
NFT Metadata
Automation
Blockchain Development
Blockchain Security
Smart Contract
Email Marketing
Email Automation
Python
Solidity
$30 hourly
- 4.9/5
- (20 jobs)
Hi! I'm a blockchain and smart contracts developer - Ethereum, Binance, Polygon I work with a team of professional developers with great experience in Blockchain development, we will work with layer 1 and layer 2 blockchains and build systems with full stack on web and mobile platforms. Moreover, we can also provide SEO & Content services to our clients. My team is equipped to provide you with the best possible solution, and we would be honored to have the opportunity to assist you with your needs.

Smart Contracts
Email Marketing Strategy
Apollo.io
Email Marketing
Lead Generation
List Building
Smart Contract
Sales Lead Lists
Salesforce CRM
Cold Calling
Blockchain Development
Data Mining
Data Scraping
Prospect List
Crypto Wallet Development
Blockchain
$150 hourly
- 3.6/5
- (66 jobs)
Full Stack Developer | Software Architect | AI Engineer Tech Stacks Languages & Frameworks: C / C++ / C# / .NET / Unity / Java / JavaScript / TypeScript / Python / Rust / PHP / VB Razor Pages / CSS3 / Maven / Spring / Angular 2+ / React.js / Redux / jQuery / HTML5 / JSX / XAML / XML/XSLT / ASP.NET MVC / ASP.NET Core / .NET Framework / DevExpress UI / Spring Framework / Spring Boot / Spring Cloud / JavaFX / QT / QML Databases: MySQL / PostgreSQL / MSSQL / NoSQL / MongoDB / Azure Cosmos DB / Redis / Firebase Realtime Database DevOps & Containerization: Docker / Kubernetes / Azure DevOps AI & Machine Learning: Machine Learning / Deep Learning / TensorFlow / PyTorch / MATLAB / Azure Cognitive Services / Azure OpenAI Services / Azure AI Video Indexer / Azure AI Prompt Flow / Google Assistant SDK Blockchain Development: Ethereum / Binance Smart Chain / Solana / Stellar / Smart Contract Development / IoT Blockchain Technologies Additional Tools & Platforms: QuickBooks Online (Intuit) App Development / Shopify App Development Full Stack Development Services App Development: Mobile, Web, and Desktop Applications, Macros & Scripts Blockchain Development: Smart Contract Development and Blockchain Integration for Ethereum, Binance Smart Chain, Solana, and Stellar Algorithmic Trading: Algo Trading Platforms for Stocks and Cryptocurrency Dashboards & Analytics: Custom Dashboards, Metrics, and Business Intelligence Solutions Custom CRM & ERP Systems: Design, Development, and Integration of Customized CRM and ERP Solutions Database Management: Database Design, Optimization, Maintenance, and Integration for MySQL, PostgreSQL, MSSQL, NoSQL, MongoDB, and other leading database systems Software Integrations: Third-Party Software Integration and IT Security Implementations AI & Cognitive Services: Development of Machine Learning, Deep Learning, and Cognitive AI Solutions using Azure AI Stacks (Cognitive Services, OpenAI, Prompt Flow, Video Indexer) and Google AI SDK

Smart Contracts
Smart Contract
Django
Node.js
Agile Software Development
Blockchain
React
Business Analysis
JavaScript
App Development
C#
Financial Analysis
Financial Modeling
C++
Python
$50 hourly
- 5.0/5
- (6 jobs)
Hello welcome to my profile....... I am Gabby, I concentrate on delivering high quality code, design, functionality, user friendly and polished flow in each app I take. I create 2D and 3D games for web and mobiles either from scratch or with a basic idea as I turn your virtual world into real-world success. Building a great game is serious stuff. It goes way beyond cool graphics or study coding. ** In the below, please click "Play video". You can see some part of my skills thru the video. ** -- Genre of games include: Casino Games Arcade Games Action Games Isometric Games RPG Games Sport Games Racing Games Card Games 3D Games Board Games Educational Games -- New Area: Blockchain Games Smart Contracts Games Ethereum & NEO Games dApp Games Trivia Quiz Games Dicing Style Games Chain Control Games Bitcoin Games Turn your game idea into a multi-million dollar reality here now!!! Thanks in advance

Smart Contracts
Ethereum
Game Art
Smart Contract
Game Development
Unity
Video Game Music
Game Design
Blockchain
Cocos2d
$50 hourly
- 5.0/5
- (1 job)
As a Chief Technical Officer with over 8 years of experience in Silicon Valley, I’ve led the development of innovative solutions across both small and large tech companies. As a Full Stack Developer, with over 10 years of experience in web and mobile applications, I spearheaded a $500K research project that was recognized as the 'gold standard' by the client. Additionally, I fine-tuned algorithms that resulted in a 5x revenue increase for a client. My track record of delivering high-impact solutions is complemented by polished communication skills and leadership. ✔️ 8+ Years of Experience with Full stack development. ✔️ Specialize in End-to-End software Development. ✔️ Fortified, impenetrable websites/apps ensuring total security. ✔️ Lightning-fast loading speeds for boosted conversion rates. ✔️ Seamlessly responsive, mobile-friendly products for all devices. ✔️ Excellent communication & problem-solving skills. My areas of expertise include: ◉ JavaScript, TypeScript for versatile and scalable code. ◉ AngularJS, Vue JS, ReactJS/Redux, Bootstrap, jQuery, Ajax for dynamic front-end development. ◉ NodeJS, ExpressJS, Python, Django, Flask, RESTful API, GraphQL, Ruby on Rails for back-end development. ◉ HTML / CSS, LESS/SCSS, TailwaindCSS for creating appealing interfaces. ◉ MongoDB, Mongoose, PostgreSQL, MySQL for data management. ◉ AWS services and deploying applications on Heroku. ◉ Bootstrap and Material UI for responsive and stylish designs. ✅ Domain Expertise: ✦ Specialized in MVP development. ✦ Extensive experience in crafting solutions for SaaS, E-commerce, and marketplace platforms. ✦ Expertise in automation leveraging OpenAI, ChatGPT, Zapier, and AI Chatbots. ✦ Deep knowledge across domains including Healthcare, Recruitment, Fintech, Education, and Real Estate. ‣► Specific API Preferences: Stripe, Paypal, Rigba, OpenAI, Klaviyo, Sendgrid, Twilio, among others. Highly motivated full-stack software engineer with nearly a decade of professional experience. My primary objective is to deliver value and become a trusted technical partner in my client's journey

Smart Contracts
Hyperledger Fabric
Blockchain Architecture
Software Design
Web Application
Mobile App Development
Solidity
API
Binance Coin
React
Node.js
Smart Contract
Cryptocurrency
Blockchain Development
DApps
$80 hourly
- 5.0/5
- (23 jobs)
Hey there! My name is Choi and I’m an Atlanta, USA-based full-stack developer and designer focused on building top-notch custom, responsive, and mobile-friendly sites, software, and applications. I’ve worked with clients like Red Bull, MoviePass, Unreal, Wolfgang Puck, Nobu, Ponix, Bonobos, and TB12 to deliver top-tier websites and I can help you do the same! All of my work includes the integration of search engine optimization (SEO) and conversion rate optimization (CRO). The types of clients I chose to work with are serious about results, organized, know what they want, and are open to suggestions and trust in expertise. Here’s what my site build-out process typically looks like: 1) Discovery - Deep dive into your organization and goals. 2) Design - Create wireframe mockups, review with clients, and annotate real-time changes. I provide up to three design rounds/iterations. 3) Development - Once approved, I develop the design into functional code utilizing a CMS. 4) QA - Test the website for responsiveness and functionalities on all popular browsers and devices. 5) Launch - We are live! Clients then go through a training session on how to manage the website and I hand the keys to the site over. The types of work I usually help my clients with include: - WordPress and Webflow Website & Landing Page Development, Design & Redesign - Software Development - Web & Mobile App Development - Web3 Site Development & Deployment - Smart Contracts - 3D Interior Design Renderings - Architect & CAD Renderings The platforms and frameworks I commonly work with include: - CMS - WordPress, Shopify & WooCommerce - Polygon & Ethereum Main Net - Flutter, Django, Angular, iQuery Mobile & ReactNative Development Languages I have expertise in: - HTML, HTML5, CSS, PHP, React, SQL, Python, Java, Node, Solidity, and more. Software I use for 3D modeling include: SketchUp, AutoCAD, Blender, MAYA, and Photoshop. Looking forward to learning about your project so that we can bring it to life together! Send me an invite on Upwork to get the process started. Talk soon! Choi

Smart Contracts
NFT Marketplace
Blockchain Architecture
Blockchain Development Framework
Blockchain
Corporate Branding
Mobile App Development
Web Application Development
Mobile App
Java
React
Ethereum
WordPress
Elementor
Smart Contract
WordPress Development
Blockchain Development
Web Design
Cryptocurrency
Website Redesign
$80 hourly
- 5.0/5
- (1 job)
I'm a Engineering Executive based in Seattle, WA, with 15 years of experience in Web2 development under my belt. However, for the past five years, I've been fully immersed in the world of Web3, and I have no plans of coming out any time soon! My AI experience spans both Web2 and Web3 technologies, including machine learning and computer vision. My skill set includes Solidity, Metaverse development, Rust, Ethereum, Solana, Polygon, DeFi, DAOs, PFP NFT projects, and smart contracts, as well as Web2 technologies like LAMP Stack, Ruby, Django, .NET, Node.JS, HTML5, PHP, SQL, JQuery, Swift, API integration, MVC framework, Java, and Hadoop. I believe that the combination of my experience in both Web2 and Web3 development, as well as AI, sets me apart from the competition. What sets me apart is my ability to keep a bird's eye view of the big picture while also keeping the details moving forward. I am well-versed in tokenomics and have experience in leading technical roadmaps, developing information architecture, and implementing effective strategies that achieve project goals. My background in digital marketing, campaign management, big data analytics, A/B testing, UI/UX research, go-to-market strategies, product development, growth hacking, and customer development has equipped me with a holistic understanding of the digital product development process. At the end of the day, I truly believe that no idea is impossible and execution beats ideas any day. So if you're looking for a talented Web3 freelancer to bring your vision to life, look no further! Let's work together to create something amazing.

Smart Contracts
NFT Minting
Systems Modeling
Rust
NFT Marketing
Software
Web3
Cryptocurrency
NFT Marketplace
Solidity
Smart Contract
Tokenomics
3D Avatar
$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.

Smart Contracts
Solidity
Blockchain
Smart Contract
Web Scraping
Node.js
React
Golang
Vue.js
GPT-3
Rust
Next.js
GPT-4
ChatGPT
Web Development
CSS
$100 hourly
- 4.7/5
- (53 jobs)
Hi! I am a senior software engineer specializing in Blockchain development with Ethereum. I am experienced with architecting and deploying large scale RESTful API services, designing databases, building responsive UI components and writing server code for highly complex applications. If you are interested in working with someone passionate about this field and capable of building applications of the highest quality and optimization, please message me so we can set up a time for a call, thanks. Top Skills: - Blockchain dev on Ethereum with Solidity and Web3.js, MetaMask, IPFS/Moralis - Frontend frameworks such as React, Angular, Vue.js, Ember.js and JQuery - Backend development with Node.js, PHP, Java/Spring, Django/Flask, C#.NET/C++ - ECommerce store and platform development with Shopify and WordPress - API construction/integrations including Twilio, Maps, Finance and more - Database management with MySQL, PostgreSQL, MongoDB, in-memory stores (Redis) - Algorithm design and problem solving from a mathematical perspective

Smart Contracts
Web Design
WordPress Development
Shopify
Solidity
Blockchain
Ethereum
Smart Contract
Java
PHP
API Integration
Spring Boot
JavaScript
React
MySQL
Node.js
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