🚀 Senior Blockchain Developer & AI Automation Specialist | Driving Web3 & AI Innovation As a highly experienced Senior Developer, I offer cutting-edge Blockchain solutions (6+ years) combined with practical AI Implementation & Automation. My expertise lies in building robust, scalable Web3 applications, specializing in Solidity smart contracts, Node.js backend development, MEV strategies, and DeFi protocols. I actively leverage AI to create intelligent automation tools, streamline complex workflows, and boost overall project efficiency through API integration and custom bot development. Whether you need a seasoned Solidity developer for secure smart contracts, a Node.js expert for scalable backends, deep blockchain expertise for complex MEV or DeFi challenges, OR an AI specialist for workflow automation and smart process integration – I deliver high-impact, results-driven solutions. Core Strengths: Blockchain Mastery (6+ Years): MEV & DeFi Specialist: Proven success designing, building, and optimizing MEV bots (AAVE, Compound, Uniswap liquidity pools) – achieved zero missed liquidations & 80% CPU reduction on a major liquidation bot. Experienced DeFi developer, built functional investment tools. Expertise in MEV strategies and arbitrage. Solidity Smart Contract Development: Secure and efficient smart contract development, testing, and deployment (including ERC-20, ERC-721, ERC-1155, and custom logic). Focus on security best practices and gas optimization. Backcend Web3 Development: Comprehensive Web3 solutions, including expert Backend Development (Node.js, Nest.js), multi-currency crypto Wallets, Blockchain Explorers, and seamless dApp integration. Deep Protocol Integration experience (15+ protocols: BTC, ETH/EVM, Solana (SOL), TRX, etc.). Blockchain Infrastructure: Proficient in Blockchain Node Setup & Maintenance (Geth, Parity), implementing Chainlink Oracles, containerization with Docker, and setting up CI/CD pipelines. AI & Automation Expertise: AI-Powered Automation: Building custom AI agents, automation scripts, and bots (incl. Telegram bots) to streamline workflows, automate repetitive tasks, and improve operational efficiency. Developing custom AI solutions. Seamless AI Integration: Skilled in connecting applications to various AI APIs (e.g., OpenAI API, other AI models) and third-party services to unlock intelligent features and data-driven insights. Practical AI Application: Focused on leveraging AI tools pragmatically to solve real business challenges and create tangible value. Why Partner With Me? ✅ Dual Expertise: A unique blend of deep blockchain development foundation and practical AI automation & integration skills. ✅ Proven Problem Solver: Excel at tackling complex technical challenges in both Web3 and AI automation, demonstrated by a diverse project portfolio. ✅ Results-Oriented: Focused on delivering secure, efficient, high-performance blockchain solutions and effective automation tools. ✅ Reliable & Communicative: Experienced collaborator (B2 English), committed to deadlines and clear, proactive communication. Ready to discuss how expert blockchain development and intelligent AI automation can elevate your project? Let’s connect! Client Feedback & Testimonials: (Testimonials remain unchanged but serve as strong social proof) Miles Austin CEO at Hyphen Global AG “Alex is an outstanding specialist in blockchain development. At Hyphen, he distinguished himself as an innovative developer, particularly in working with Chainlink oracles and creating smart contracts. His flexible approach to development and ability to quickly adapt to new technologies played a key role in moving our projects forward. Alex is not only technically proficient but also possesses strategic vision, making him an invaluable asset to any team.” Thierry Gilgen Founder & CEO at EveryFin “Working with Alex was an absolute pleasure. As Tech Lead for our Blockchain development team, he consistently impressed me with his outstanding technical knowledge and unwavering dedication to the success of our project. His ability to communicate complex ideas in a clear and concise manner was invaluable, and he was always willing to go the extra mile to ensure our team was successful.” “Beyond his technical expertise, Alex is an incredibly motivated and resilient individual who never shied away from a challenge. His positive attitude and willingness to take on new responsibilities made him an invaluable member of our team. I have no doubt that he will continue to achieve great things in his future endeavors and I would highly recommend him to any organization looking for a talented and dedicated developer.”

Hi, I am a senior blockchain developer with proficiency in NFT marketplace, Smart Contract development, ICO& IDO, Smart Contract Audits, DeFi/DApp development. My blockchain experience is extensive, having worked with blockchain since 2014. I am well-versed in the following services: ✓ Smart Contract Development - ERC20, ERC721, ERC721A, ERC1155, BEP20, BEP721 Standards, Solana, EOSIO, WAX networks. - Contract Test and Audit in development environment by using Truffle, Hardhat - Anti-Bot, Whitelist functions integration for Token, NFT contracts - Wrap Token Contract development from BTC, NDAU, Doge, etc. ✓ Smart Contract Audits - Code checking line by line - High/Middle/Low level severity Audit test on the testnet, devnet - Provide audit with functional example ✓ Defi/ DApp Development - Forking Dex tools like Uniswap, Sushiswap, Pancakeswap, Rubic with special requirement - Crypto Escrow System development (Frontend: React, Backend: Laravel, Python/Flask, Escrow Contract development) - ICO & IDO, Token airdrop & presale service platform with custom supply, Liquidity, whitelist - Wallet connection using web3.js or ether.js ✓ NFT minting & staking, marketplace Development - Minting, Staking Contract on ERC721, ERC1155 standards on Ethereum, Polygon, Avalanche, BSC, Harmony, Solana network - P2E (Play to Earn) contract development ✓ Cross-Chain-Bridge Development. - Child Token, Bridge Contract development - Relay service integration like Moralis, Chainlink, Chainstack - Well-made Cross-Bridge DApp development using react.js, web3.js, MongoDB ✓ CEX Development - Spot & Margin Trading option, Multi-Chain Support - Fiat Withdraw, Deposit function by using PayPal, Stripe, CoinPayment, Perfect Money Api integration - Well-Structured DB Design ✓ Crypto Bot Development - NFT Minting & Sale Order Bot development - Auto Trading Bot - Crypto AIO Bot I am available on the flexible timezone, and I can accept full-time, part-time, contest position. Therefore If you share your idea, I will make it to reality. Best Regards

Expert Solidity Developer | Web3 Backend Engineer | Smart Contract Specialist $30.00/hr 🎖️ Top Rated Web3 Developer 🕒 50+ Projects Delivered ✅ 5 Years of Experience in Blockchain Development ✅ Deployed 30+ Smart Contracts Hi, I’m a passionate Solidity developer with over 5 years of experience building secure and efficient blockchain solutions for DeFi, NFTs, and decentralized applications. With more than 30 successful smart contract deployments, I focus on creating robust Web3 backends, including consulting, auditing, development, and integration. I specialize in these areas: ✅ Smart Contract Development with Solidity ✅ Web3 Backend Architecture (TypeScript, Node.js) ✅ Blockchain Indexing and Querying with Ponder ✅ Ethereum and EVM-Compatible Chains (Polygon, Binance Smart Chain, etc.) ✅ DeFi Protocols (Lending, DEX, Yield Farming) ✅ NFT Minting, Marketplace, and Metadata Integration ✅ Wallet Integration (MetaMask, WalletConnect) ✅ API Development for DApps (RESTful, GraphQL) ✅ Smart Contract Auditing and Security Best Practices ✅ Gas Optimization and Performance Tuning ✅ Integration with Oracles (Chainlink) and IPFS ✅ Testing Frameworks (Hardhat, Foundry, Truffle) 🎯 I’m ready to help you build scalable, secure, and innovative Web3 projects. I combine deep technical expertise in blockchain with a focus on user-centric solutions, ensuring your dApps are reliable, efficient, and ready for mainnet deployment. Let’s collaborate and bring your decentralized ideas to life! 🔑 𝐊𝐄𝐘𝐖𝐎𝐑𝐃: Solidity, Smart Contracts, Web3 Development, Blockchain Developer, Ethereum, DeFi, NFT, DApp Development, TypeScript, Ponder, Hardhat, Foundry, Truffle, EVM, Polygon, Binance Smart Chain, Chainlink, IPFS, Wallet Integration, MetaMask, WalletConnect, GraphQL, REST API, Blockchain Indexing, Smart Contract Auditing, Gas Optimization, Blockchain Security, Web3 Backend, Node.js, Decentralized Finance, Non-Fungible Tokens, Crypto Development, Solidity Developer, Web3 Engineer, Blockchain Engineer, Solidity Expert, Smart Contract Specialist, DeFi Developer, NFT Developer, Blockchain Integration, Oracle Integration, Web3 API, DApp Backend, Blockchain Testing, Solidity Programming, Web3 Stack, Crypto Wallet, Decentralized Applications, Blockchain Protocols, Solidity Contracts, Web3 Frameworks, Blockchain Solutions, Crypto Engineering, Solidity Deployment, Web3 Consulting, Blockchain Auditing, Solidity Optimization, Web3 Security, Crypto Integration, Blockchain Architecture, Solidity Coding, Web3 Tools, Crypto Developer, Solidity Blockchain, Web3 Expert, Blockchain Specialist, Solidity Smart Contracts, Web3 Solidity, Crypto Smart Contracts

Highly experienced Blockchain Engineer with a strong background in smart contract development, decentralized applications (dApps), and blockchain infrastructure design. I specialize in building secure, scalable, and efficient blockchain solutions across Ethereum, Solana, Binance Smart Chain (BSC), and Layer 2 ecosystems. I’ve contributed to a wide range of DeFi platforms, NFT marketplaces, and cross-chain systems, focusing on performance optimization, security auditing, and protocol-level innovation. My experience also includes automation and strategy systems within blockchain-based trading environments — integrating on-chain and off-chain data for advanced analytics and execution. ✅ Core Blockchain Development Expertise Smart Contracts & Protocols - Solidity, Rust, Anchor, Hardhat, Foundry - Smart contract architecture, auditing, and optimization - Governance, staking, and yield farming mechanisms DeFi & Web3 Systems - AMMs, DEXs, liquidity pools, and staking systems - Flash loans, MEV strategies, and cross-chain interoperability - Layer 2 scaling: zk-Rollups, Optimistic Rollups, and bridge protocols NFT & Token Engineering - NFT minting, staking, and marketplaces - ERC-20, ERC-721, ERC-1155, and SPL tokens - NFT auctions, fractional ownership, and metadata systems Blockchain Infrastructure & Security - Smart contract auditing and reentrancy protection - Decentralized oracles (Chainlink, Pyth, Band Protocol) - Node setup, validator management, and decentralized storage (IPFS, Arweave) ✅ Automation & Trading Systems (Complementary Expertise) While my primary focus is blockchain engineering, I also design on-chain and off-chain automation systems, including DeFi bots and strategy integrations for liquidity management and execution. Skills include: - Algorithmic execution (arbitrage, market-making, yield optimization) - Exchange APIs: Binance, Kraken, Coinbase, Alpaca, Interactive Brokers - Data analysis with Pandas, NumPy, and Plotly - Machine learning integration using TensorFlow and Scikit-learn 🚀 Passion & Focus I am passionate about building decentralized technologies that enhance transparency, security, and scalability in the Web3 ecosystem. My work bridges the gap between blockchain infrastructure, DeFi innovation, and automated systems, creating reliable and future-proof solutions that push the boundaries of decentralized technology.

I am a civil engineer with over 11 years of experience in public infrastructure projects, specializing in municipal and transportation sectors. My expertise includes managing complex projects such as water mains, sewer systems, and roadway improvements, ensuring compliance and effective cost oversight throughout preconstruction, construction, and closeout phases. I have a solid background in project coordination, field inspections, and documentation control, which allows me to streamline workflows and enhance decision-making processes. Additionally, my experience as a business analyst equips me with the skills to analyze data and support project management effectively. Whether managing concurrent projects or ensuring quality assurance, I deliver results that align with your organization’s goals. If you need a reliable partner to navigate the complexities of infrastructure projects, let’s connect and discuss how I can contribute to your success.

I am a highly skilled Full Stack Web and Mobile Developer with 10+ years of experience delivering scalable, high-performance software solutions. I specialize in developing robust web and mobile applications using cutting-edge technologies, ensuring optimal user experience, security, and efficiency. With expertise in Blockchain and AI, I develop decentralized applications (dApps), smart contracts, and Web3 solutions using Ethereum, Solidity, Binance Smart Chain (BSC), Polygon, and IPFS. I integrate AI and machine learning into applications, leveraging OpenAI, TensorFlow, PyTorch, and LangChain to create intelligent automation, recommendation systems, and AI-powered analytics. My work ensures seamless, secure, and innovative digital experiences for users. 🔹 What I Bring to the Table ✅ Front-End Development – React, Vue.js, Next.js, Nuxt.js, TypeScript, JavaScript ✅ Back-End Development – Node.js, Express.js, NestJS, Golang, PHP, CakePHP ✅ Mobile Development – React Native, Flutter, Kotlin, Swift, Android SDK, iOS Development ✅ Databases & Cloud – Firebase, MongoDB, MySQL, PostgreSQL, AWS, Google Cloud (GCP), BigQuery ✅ DevOps & Infrastructure – Git, CI/CD, Docker, Kubernetes, Microservices, Nginx, API Development ✅ Agile & Project Leadership – Team Lead, Code Reviews, Mentorship, Agile Development 🔹 Cloud & DevOps Integration – I design and deploy scalable, cloud-native applications using AWS, Azure, and Google Cloud, implementing CI/CD pipelines, Kubernetes, Docker, and Terraform for seamless automation, deployment, and infrastructure management. 🔹 Why Hire Me? ✔️ Proven track record of leading development teams and delivering high-impact solutions ✔️ Strong expertise in building SaaS platforms, fintech apps, e-commerce solutions, and enterprise systems ✔️ Experience in blockchain integration and Web3 development ✔️ Detail-oriented problem solver with a passion for writing clean, scalable, and maintainable code ✔️ Excellent communication & collaboration skills – I ensure seamless execution from planning to deployment Whether you need a custom-built web or mobile application, API integrations, or full-cycle product development, I am here to bring your vision to reality with technical excellence and strategic insight. 💡 Let’s build something amazing together! 🚀

I'm developing blockchain solutions since 2017. Including the crypto exchanges (P2P and CEX), blockchain forks, tokens creation (ERC-20, ERC-721 NFT), smart contracts, DeFi and Ethereum mass payment tools with low gas consumption. The other chains experience includes: Bitcoin, Polymesh, Chainlink, and Hyperledger. In the past I've been managing software development projects for the world-class companies like Opera Software and Status.im. I help my client to bring their ideas to production by creating a highly performing IT teams that deliver. I have hands-on experience with Python, Django, AWS, R, Hadoop, SQL, Bash, PostgreSQL, MySQL, MS SQL. I'm in IT since the 1990x. MBA degree since 2010. I'm well versed in Blockchain technologies and particularly Ethereum. I lead a top rated team - the Beemster Team - which is ready to deliver a software solution for your product or idea from the discovery and proof of concept to the production and maintenance. Stay safe - hire reliable people that deliver, do not disappear, and do not cheat. Please check my LinkedIn (Viacheslav Shybaiev) profile for extra recommendations. I am open to opportunities that can make the world a better place - and I'd be glad to know the details about your project or idea. Please make sure to checkout my video introduction using the link below this text. You can also find Beemster Team channel on YouTube and see our team live.

Hey Everyone, I am a senior blockchain developer with strong skills in Solidity and Rust. I build and secure smart contract and also Secure Expert with real experience finding high impact bugs in DApps. I have worked on DeFi apps, NFT platforms, staking protocals and trading systems and I know how to build smart contracts and optimized. I have reported vulnerabilities on top bug bounty platforms like Code4rena, Hats Finance and Immunefi, helping teams fix critical and high issues before attackers find them. As a security focused Expert, I can write safe and gas efficient smart contracts. Also audit solidity and rust code for vulnerabilities and help with web3 integrations and dApp connections. I would like to review protocol logic to prevent hacks. This is my first time on Upwork and I think it's a great place for me to grow. I will do my best work for every client and I am confident I will build a strong profile with great reviews and job success. Let us work together to build something secure and powerful. Best Oleksandr M.

Blockchain engineer, with focus on backend and smart contract development. Project experience: - Developed a multi-currency cryptocurrency wallet. - Developed a blockchain explorer for a Bitcoin-based cryptocurrency. - Develop MEV Bot for AAVE and Compound Lending protocols - Developed infrastructure to introduce greenhouse gas data into the EVM chain using Chainlink. - Maintained the crypto backend for the major centralized crypto exchange. - Created an Investment product in DeFi area. - Upgraded an NFT Marketplace to work with the ERC1155 standard. - Connected different cryptos at the protocol layer to the CEX, including BTC, ETH, BNB, BSC, TRX, EOS, XLM, XRP, NEM, NEO, LTC, DASH, ZEC, and some forks. - Launched and maintained crypto nodes BTC, ETH (GETH, Parity), LTC, DASH, ZEC, - Developed crypto Telegram bots, an auth backend, etc..

(Top 1 Percent) Full Stack Developer: AI/ML, MVP, SaaS, Web, Mob, RAG ⭐⭐⭐⭐⭐ Hey, I’m an expert-vetted (Top 1%) Senior Full Stack Developer with 16,00+ hours (6 Years) of 'traceable experience' developing custom enterprise-grade SaaS/MVP/Mobile/Web applications for Fortune 500, MNCs, SMEs, and start-ups across diverse industries. I position myself as a strategic partner throughout the software development lifecycle encompassing; design, development, implementation, deployment, and ongoing support. I’ve delivered 1100+ projects for clients in 38 countries, consistently achieving 100% client approval and satisfaction. I follow software development best practices to ensure the delivery of high-quality applications. I have established a strong reputation in custom software development, feature enhancements, digital transformation, and cloud migrations. I optimize infrastructure architecture, performance, and conversion rates, automate business processes, and provide technical consultation, maintenance, and support services to SMEs and large corporations. From revamping the publication platform of the New York Sun to leading the digital transformation of SCTE's legacy system on a serverless infrastructure. Improving the conversion rate and user experience for Toyota North America's website or integrating SiriusXM with ARI and GS1 with Marketo funnel management system, I have a proven track record of delivering impactful results at scale. My strengths include developing cloud-native applications, coding programming languages, standalone and API-driven web applications, microservices architectures, and token-based RestFul API servers. I take pride in developing scalable enterprise applications and managing resources within constraints. With a 100% track record of delivering projects on time, my credo is to exceed client expectations by focusing on the last 20% (attention to detail) which yields 80% of the results. Whether you're looking for a skilled development partner proficient in the latest technologies, tools, frameworks, or libraries or an experienced technical consultant to modernize legacy systems or develop cutting-edge platforms from scratch, feel free to reach out!! ⦿ Software Development: Full-Stack Development | Web and Mobile Development | Web Application | Android | iOS | Custom Web3 dApps | Smart Contract | Crypto Wallet | AI Agent Development | AI Bot | CMS Development | Machine Learning AI/ML | NLP | Data Analytics | ETL | SaaS Development | MVP | Database Architecture | API Development | dApp Development | AWS | GCP | DevOps | MERN | MEAN | LAMP | QA/QC ⦿ Tech-stack: ⁃ Front-End Development: React.js, Vue.js, JavaScript, TypeScript, Tailwind CSS, HTML, Angular, jQuery ⁃ Back-End Development: Node.js, Golang, Rust, C++, Zig, Express.js, Next.js, NestJS, Nuxt.js, Python, Django, Java, Spring, Laravel, PHP, Firebase, Ruby on Rails, Kotlin, Swift, Flutter ⁃ Database Management: MySQL, MongoDB, PostgreSQL, BigchainDB ⁃ Blockchain: Ethereum, Solana, Solidity, Anchor, Smart Oracles, Chainlink, DeFi, DEX, Crypto Hyperledger Fabric, Web3.js, Ethers.js ⁃ Messaging/Queuing: Apache Kafka, RabbitMQ, Amazon SQS, Redis Streams, NATS, Adaptive Aeron ⁃ API Integration: RESTful APIs, REST, FastAPI, GraphQL, gRPC, OpenAPI, WebSockets, Microservice ⁃ AI Integration: Open AI, Claude, Gemini, ChatGPT, Llama ⁃ Machine Learning (AI/ML): AI Agent, AI Bot, Python, TensorFlow, PyTorch, LangChain, OpenAI GPT, FastAPI, Apache Spark, Hugging Face, AWS SageMaker, OpenCV, Vertex AI, RAG, LLM finetune, NLP, ML ⁃ AWS Tools: Lambda, CloudFront, EC2, S3, Kinesis, Kubernetes, Docker, Nginx ⁃ Custom Development: AI SaaS Apps, EdTech Platforms, Healthcare, Medtech, Business Process Automation SaaS apps, ERP systems, IoT devices, dApps, DeFI apps, DEX apps, AI chatbot ⁃ Version Control: Git, GitHub, Bitbucket ⦿ Notable Clients & Industry impact: ⁃ NCR Voyix – Led full-stack digital transformation for a NYSE-listed company, improving its retail, restaurant, and banking systems. ⁃ SCTE-ISBE – Developed an enterprise Learning Management System (LMS) for an international regulatory body. ⁃ Toyota North America – Delivered high-performance digital solutions for a leading automotive manufacturer. ⁃ The New York Sun – Built scalable publishing and subscription systems for a Pulitzer Prize-winning media company. ⁃ GS1 – Engineered a global supply chain management system governing over 150M+ barcodes worldwide. ⁃ Hitachi Consulting – Provided high-impact technology solutions to modernize industrial operations. ⁃ LearnForce – Developed one of Europe’s largest multi-tenant EdTech platforms. ⁃ Johnson & Johnson – Contributed to pharmaceutical digital transformation & healthcare technology advancements. ⁃ SiriusXM – Engineered AI-driven streaming integrations for a market-leading satellite radio platform. ⁃ Finalmouse – Designed & developed custom hardware-software integration for premium gaming peripherals. ⁃ MonkeyTilt – De