I've architected a full Layer-1 blockchain from scratch consensus, validators, staking and built AI agents that transact on-chain autonomously. 100% Job Success, every rated project 5 stars.
I'm a Blockchain & AI Developer who ships complete products end-to-end: smart contracts, backends, web dApps, and mobile apps. Clients come to me when they need one developer who understands the full stack from on-chain logic to the app store.
WHAT I DELIVER
Agentic AI & On-Chain Payments — Autonomous AI agents transacting via the x402 protocol: machine-to-machine micropayments, zero human intervention. Built with LangChain, CrewAI, and LLM APIs.
Custom Layer 1 Blockchains Complete chains with consensus, validator infrastructure, staking economics, block explorer, and faucet delivered with UAT reports and scaling roadmaps.
Solana Development Anchor programs and MEV-aware trading systems with Jito bundle execution, backed by NestJS/PostgreSQL.
Full dApp Development NFT marketplaces, DeFi tools, token platforms across Ethereum, Polygon, and EVM chains wallet integration to polished frontend.
Mobile Apps Cross-platform Flutter apps with Web3 integration, including a multilingual P2P crypto trading platform with USDT escrow.
AI Products & Automation LLM-powered systems, multi-agent workflows, AI fact checking infrastructure, and intelligent automation pipelines.
Enterprise Integration Hyperledger Fabric systems, including edge-device deployments with tamper-proof data integrity.
STACK
Rust • Solidity • C++ • TypeScript • Python • React/Next.js • Node.js/NestJS • Flutter • Anchor • Web3.js • LangChain • CrewAI • IPFS • Hyperledger • PostgreSQL • MongoDB
HOW I WORK
Clients hand me a problem statement, not a spec and receive a production system with documentation, testing reports, and a roadmap. Recent feedback: "very professional and fast, will hire again."
Whether it's a smart contract, a full dApp, a mobile app, or an AI agent system I build it production-ready. Let's scope your project.
web3.js
MongoDB
Python
C++
Blockchain
Golang
Solidity
Rust
Solana
Ethereum
Bitcoin
Artificial Intelligence
AI Agent Development
Machine Learning
Next.js
IPFS
Hyperledger Fabric
Web3
DApp Development
ZK Framework
Sunny K.
Jawalamukhi, India
$16/hr
5.0
212 jobs
👑𝐁𝐥𝐨𝐜𝐤𝐜𝐡𝐚𝐢𝐧 𝐂𝐨𝐧𝐬𝐮𝐥𝐭𝐚𝐧𝐭₿⃨ 🥇10+ years of 𝑺𝑶𝑳𝑰𝑫 experience 🕒 24*7 ✨
With over 10+ years of high-demand experience in 𝗯𝗹𝗼𝗰𝗸𝗰𝗵𝗮𝗶𝗻 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁, I specialize in delivering robust 𝗳𝗿𝗼𝗻𝘁-𝗲𝗻𝗱 and 𝗯𝗮𝗰𝗸-𝗲𝗻𝗱 solutions for 𝗯𝗹𝗼𝗰𝗸𝗰𝗵𝗮𝗶𝗻-𝗽𝗼𝘄𝗲𝗿𝗲𝗱 𝗮𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀. My expertise covers comprehensive smart contract development, including 𝗦𝗼𝗹𝗶𝗱𝗶𝘁𝘆 and 𝗥𝘂𝘀𝘁 for platforms like 𝗘𝘁𝗵𝗲𝗿𝗲𝘂𝗺 and 𝗦𝗼𝗹𝗮𝗻𝗮. I excel in architecting, implementing, and auditing 𝗱𝗲𝗰𝗲𝗻𝘁𝗿𝗮𝗹𝗶𝘇𝗲𝗱 solutions tailored for industries like 𝗙𝗶𝗻𝘁𝗲𝗰𝗵, where 𝘁𝗼𝗸𝗲𝗻𝗶𝘇𝗮𝘁𝗶𝗼𝗻, 𝘀𝗲𝗰𝘂𝗿𝗶𝘁𝘆, 𝗮𝗻𝗱 𝘀𝗰𝗮𝗹𝗮𝗯𝗶𝗹𝗶𝘁𝘆 are essential. By leveraging blockchain’s power, I create innovative applications that support 𝗱𝗲𝗰𝗲𝗻𝘁𝗿𝗮𝗹𝗶𝘇𝗲𝗱 𝗳𝗶𝗻𝗮𝗻𝗰𝗲 (𝗗𝗲𝗙𝗶), 𝗻𝗼𝗻-𝗳𝘂𝗻𝗴𝗶𝗯𝗹𝗲 𝘁𝗼𝗸𝗲𝗻𝘀 (𝗡𝗙𝗧𝘀), 𝐒𝐦𝐚𝐫𝐭 𝐂𝐨𝐧𝐭𝐫𝐚𝐜𝐭 𝐀𝐮𝐝𝐢𝐭𝐨𝐫 and 𝗮𝗱𝘃𝗮𝗻𝗰𝗲𝗱 𝘀𝗺𝗮𝗿𝘁 𝗰𝗼𝗻𝘁𝗿𝗮𝗰𝘁 functionality, ensuring secure and efficient solutions.
My approach includes precise requirement 𝗮𝗻𝗮𝗹𝘆𝘀𝗶𝘀, 𝘀𝘁𝗿𝗮𝘁𝗲𝗴𝗶𝗰 𝗽𝗹𝗮𝗻𝗻𝗶𝗻𝗴, 𝗲𝗳𝗳𝗶𝗰𝗶𝗲𝗻𝘁 𝗰𝗼𝗱𝗶𝗻𝗴, 𝘁𝗵𝗼𝗿𝗼𝘂𝗴𝗵 𝗱𝗲𝗯𝘂𝗴𝗴𝗶𝗻𝗴, 𝗮𝗻𝗱 𝘀𝗲𝗮𝗺𝗹𝗲𝘀𝘀 𝗱𝗲𝗽𝗹𝗼𝘆𝗺𝗲𝗻𝘁. With minimal supervision, I ensure each stage aligns with project goals, producing solutions that are both innovative and reliable.
𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀 : -
=============================================================================
🔥𝗕𝗹𝗼𝗰𝗸𝗰𝗵𝗮𝗶𝗻: 𝗕𝗶𝘁-𝗰𝗼𝗶𝗻, 𝗘𝘁𝗵𝗲𝗿𝗲𝘂𝗺, 𝗦𝗼𝗹𝗮𝗻𝗮 ,𝗘𝗢𝗦, 𝗛𝘆𝗽𝗲𝗿𝗹𝗲𝗱𝗴𝗲𝗿, 𝗦𝘂𝗯𝘀𝘁𝗿𝗮𝘁𝗲, 𝗡𝗙𝗧, 𝗦𝗼𝗹𝗶𝗱𝗶𝘁𝘆: 𝗲𝗿𝗰𝟮𝟬/𝗗𝗲𝗙𝗶, 𝗲𝗿𝗰𝟳𝟮𝟭/𝗡𝗙𝗧.
🔥𝗙𝗿𝗼𝗻𝘁-𝗲𝗻𝗱: 𝗥𝗲𝗮𝗰𝘁.𝗷𝘀, 𝗡𝗲𝘅𝘁, 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁 (𝗘𝗦𝟲), 𝗧𝘆𝗽𝗲𝗦𝗰𝗿𝗶𝗽𝘁, 𝗔𝗻𝗴𝘂𝗹𝗮𝗿, 𝗩𝘂𝗲.𝗷𝘀
🔥𝗕𝗮𝗰𝗸-𝗲𝗻𝗱: 𝗡𝗼𝗱𝗲.𝗷𝘀, 𝗣𝗛𝗣 𝗟𝗮𝗿𝗮𝘃𝗲𝗹, 𝗙𝗶𝗿𝗲𝗯𝗮𝘀𝗲.
🔥𝗗𝗕: 𝗠𝘆𝗦𝗤𝗟, 𝗠𝗼𝗻𝗴𝗼 𝗗𝗕
𝗣𝘂𝗯𝗹𝗶𝗰 𝗕𝗹𝗼𝗰𝗸𝗰𝗵𝗮𝗶𝗻 𝗣𝗹𝗮𝘁𝗳𝗼𝗿𝗺𝘀: -
=============================================================================
✔ 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗶𝗻𝗴 𝘀𝗺𝗮𝗿𝘁 𝗰𝗼𝗻𝘁𝗿𝗮𝗰𝘁𝘀 𝘂𝘀𝗶𝗻𝗴 𝗮 𝗦𝗼𝗹𝗶𝗱𝗶𝘁𝘆 𝗽𝗿𝗼𝗴𝗿𝗮𝗺𝗺𝗶𝗻𝗴 𝗹𝗮𝗻𝗴𝘂𝗮𝗴𝗲.
✔ 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗶𝗻𝗴 𝗥𝗣𝗖 𝘂𝘀𝗶𝗻𝗴 𝗰𝗹𝗶𝗲𝗻𝘁 𝗹𝗶𝗯𝗿𝗮𝗿𝗶𝗲𝘀 𝘀𝘂𝗰𝗵 𝗮𝘀 𝗪𝗲𝗯𝟯
✔ 𝗦𝘁𝗮𝘁𝗶𝗰 𝗮𝗻𝗮𝗹𝘆𝘀𝗶𝘀 𝗼𝗳 𝘀𝗺𝗮𝗿𝘁 𝗰𝗼𝗻𝘁𝗿𝗮𝗰𝘁𝘀 𝗳𝗼𝗿 𝗴𝗮𝘀 𝗰𝗼𝗻𝘀𝘂𝗺𝗽𝘁𝗶𝗼𝗻 𝗮𝗻𝗱 𝗼𝗽𝘁𝗶𝗺𝗶𝘇𝗮𝘁𝗶𝗼𝗻 𝘂𝘀𝗶𝗻𝗴 𝗥𝗲𝗺𝗶𝘅 𝗜𝗗𝗘.
✔ 𝗦𝗲𝗰𝘂𝗿𝗶𝗻𝗴 𝘀𝗺𝗮𝗿𝘁 𝗰𝗼𝗻𝘁𝗿𝗮𝗰𝘁𝘀 𝘂𝘀𝗶𝗻𝗴 𝗹𝗶𝗯𝗿𝗮𝗿𝗶𝗲𝘀 𝗹𝗶𝗸𝗲 𝗢𝗽𝗲𝗻𝗭𝗲𝗽𝗽𝗲𝗹𝗶𝗻.
✔ 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗶𝗻𝗴 𝗘𝘁𝗵𝗲𝗿𝗲𝘂𝗺 𝗱𝗮𝗽𝗽𝘀 𝘂𝘀𝗶𝗻𝗴 𝘁𝗵𝗲 𝗧𝗿𝘂𝗳𝗳𝗹𝗲 𝗳𝗿𝗮𝗺𝗲𝘄𝗼𝗿𝗸.
✔ 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻 𝘄𝗶𝘁𝗵 𝗰𝗿𝘆𝗽𝘁𝗼 𝘄𝗮𝗹𝗹𝗲𝘁𝘀 𝘀𝘂𝗰𝗵 𝗮𝘀 𝗠𝗲𝘁𝗮𝗺𝗮𝘀𝗸.
✔ 𝗦𝗸𝗶𝗹𝗹𝗲𝗱 𝗶𝗻 𝗹𝗲𝘃𝗲𝗿𝗮𝗴𝗶𝗻𝗴 𝗦𝗣𝗟 𝗹𝗶𝗯𝗿𝗮𝗿𝗶𝗲𝘀 𝗳𝗼𝗿 𝗿𝗮𝗽𝗶𝗱 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁
✔ 𝗗𝗲𝗽𝗹𝗼𝘆𝗶𝗻𝗴 𝘀𝗺𝗮𝗿𝘁 𝗰𝗼𝗻𝘁𝗿𝗮𝗰𝘁𝘀 𝗼𝗻 𝘁𝗲𝘀𝘁 𝗻𝗲𝘁𝘄𝗼𝗿𝗸𝘀 𝘀𝘂𝗰𝗵 𝗮𝘀 𝗿𝗼𝗽𝘀𝘁𝗲𝗻/𝗿𝗶𝗻𝗸𝗲𝗯𝘆 𝗮𝘀 𝘄𝗲𝗹𝗹 𝗮𝘀 𝗘𝘁𝗵𝗲𝗿𝗲𝘂𝗺
𝗺𝗮𝗶𝗻𝗻𝗲𝘁.
I'm always ready to provide efficient, impactful assistance and to take on new challenges swiftly. If you need any of the services mentioned, feel free to reach out—I'm prepared to dive in and deliver exceptional results!
I pride myself on identifying the most cost-effective, high-quality solutions for every opportunity I encounter.
Thank you for considering my profile!
#BlockchainConsultant #SmartContracts #DecentralizedApps #Solana #Ethereum #Bitcoin #DeFi #NFT #Web3 #CryptoDevelopment #BlockchainExpert #FullStackBlockchain #SolidityDev #FintechSolutions #Tokenization #SmartContractAuditing #FrontEndBlockchain #BackendArchitecture #ReactJS #NodeJS #Laravel #MongoDB #MySQL #MetamaskIntegration #OpenZeppelin #TruffleFramework #CryptoWalletIntegration #BlockchainInnovation #TechnologyConsultant #TechLeadership #CostEffectiveSolutions #ReadyToCode
DApp Development
Smart Contract
Blockchain Development
Solidity
web3.js
Hyperledger Fabric
Crypto Exchange Platform
Cryptocurrency
Crypto Wallet Development
Software Development
Smart Contract Development
AI Development
Machine Learning
Blockchain, NFT & Cryptocurrency
Layer 2 Blockchain
Shobi K.
Noida, India
$10/hr
4.9
52 jobs
✅ Experienced (17+) ✅ Certified ✅ 100% Job Success, ✅Top Rated, ✅free Consulations
I'm a result-oriented self-motivated charismatic leader with strong organizational and prioritization abilities. Worked in outsourcing (custom software development) in the following domains: e-commerce, social networks, blockchain, insurance, finance, telecommunication, electronic document management systems, RPA (robotic process automation), ERP, AI, Healthcare, IoT, DATA Science, Cyber Security, Security Audit, Supply chain, Real Estate, Blockchain-based identifiers, Blockchain-based healthcare system.
Summary
- Leading in IT since 2010
- Managing up to 100+ developers (distributed and on-site teams)
- General MCA, Blockchain Course
🏆- Certified Enterprise Architect
🏆Blockchain Certified
🏆Agile Certified
🏆Scrum Certified
🏆Project management Certified
🏆Leadership Certified
🏆Communication Certified
🏆 Many other 22+ Certified.
Achievements
🥇Enterprise Architecture solutions for more than 50+ projects
🥇Service-oriented company SPEQTO TECHNOLOGIES with more than 6+ Top MNCs experience such as HPE, Docomo, Wipro, Airtel & Avaya as former employee history.
🥇Custom grade-based motivation system for IT specialists
I focus on building teams and projects from scratch, introducing software development processes and best practices. At the same time, I dedicate on tasks related to performance optimizations, refactoring and implementing various algorithms.
Quick snapshot of my skills:
● Engineering and technical skills
● Programming languages (Node JS, Kotlin, Go, JavaScript, python, Php, Swift, Objective C, Solidity, Rust, React JS, Nest JS, Vue JS, Go Lang)
● Cloud DevOps (Azure, GKE, AWS) - Services & Build Pipelines
● Delivery Management
● Strategic Management
● Performance Management
● Risk Management
My core specialization lies in-:
1. Smart contracts
2. Devising custom Blockchain solutions on private/public Blockchains
3. Decentralized applications
4. Setting up of Blockchain architecture
5. NFT Marketplace development
6. Smart Contract audit
7. End to End DApps development
8. Blockchain Consultancy
Blockchain Development Services We Offer:
⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷
Being a full-stack blockchain developer & solidity programmer and associated with an ISO certified blockchain development company, I develop rapid, error-free website & web applications to achieve an enterprise's functionality implementation and business logic with minimum complexities
✅ Custom Blockchain Development
✅ Smart Contracts Development
✅ DApp Development
✅ Crowd sale
✅ Hyperledger & Multichain Development
✅ Multichain/Supply Chain Development
✅ Custom Cryptocurrency Development
✅ Crypto App Development
✅ ICO Web Development
✅ POC Development
✅ Cryptocurrency Wallet and Exchange Applications
✅ Private Blockchain Development
✅ Blockchain Consulting
✅ Blockchain Testing
✅ Ongoing Blockchain Development Support and Maintenance
✅ Full-Stack Blockchain Development
✅ Full-Time Dedicated Blockchain Developer
Tech Skills:
My Skills:
• Ethereum
• Solidity
• Web3.js
• NodeJS
• React JS
• Python
• Django
• Hyperledger Fabric
• R3 Corda
• Quorum
• JavaScript
• jQuery
8+ years’ Experience + NodeJS + Microservices + React JS + Stencil JS + Blockchain (Ethereum + Solidity + DApp + Smart Contracts + Truffle + web3.js + ether.js + NFT + Open sea)
My Technical Blockchain Development Expertise:
⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷
Being a full stack blockchain developer, I have decent expertise in Blockchain development and custom smart contract application development technologies:
✅ Server-Side Languages: PHP, Node JS, Java, Spring boot, Microservice
✅ Frameworks: Express JS, YII2, Laravel, Cake PHP
✅ JavaScript Frameworks: Angular JS, jQuery, React JS, Vue JS, Nest JS, Jade JS
✅ Smart contract language: Solidity
✅ Data Management:
• RDBMS: MySQL 5.X, PostgreSQL, Amazon RDS
• NoSQL: MongoDB.
• Caching: Memcached, Redis
• Searching: Solr, Lucene, Elasticsearch, Amazon CloudSearch
✅ Queue: ActiveMQ, Amazon SQS
✅ Server Technologies: Linux, Ubuntu
✅ Cloud Computing Platforms: Amazon Web Services
✅ Frontend Stack:
• Languages: HTML5, CSS3, Sass, JavaScript
• UI Frameworks: Bootstrap, jQuery UI
• JavaScript Frameworks: React, Backbone.js, Angular 2
✅ Third-Party APIs Integration:
• Payment Gateway: PayPal, Stripe, Authorize.Net, Coinpayments.net
• Social: Facebook, Twitter, Google+
• Geo-location: Google Maps, Bing Maps
• File Storage: Dropbox, Google Drive
Supported Standards:
1. ERC-20 - Standard tokens
2. ERC-998 - Composable Tokens
3. ERC-721 - NFTs
4. ERC-1155 - NFTs
5. On-Chain NFTS
Supported Networks:
1. ETHEREUM
2. SOLANA
3. POLYGON/MATIC
4. BSC
5. AVALANCHE
6. FANTOM
7. Base Chain
8. Cardano
I can be your technical, strategic, marketing, and product advisor and consultant to help your company or business learn more about the NFT space and answer any questions you might have about the industry and trends.
Cryptocurrency
Blockchain Development
Hyperledger Fabric
NFT Marketplace
Smart Contract
Solidity
Metaverse
NFT Minting
web3.js
Blockchain
AI Bot
ChatGPT
Blockchain, NFT & Cryptocurrency
Bot
Web Application
Hoang Q.
Hanoi, Vietnam
$35/hr
4.8
70 jobs
Backed by 100% Job Success over 60 projects, 𝐈 𝐨𝐟𝐟𝐞𝐫 𝐅𝐑𝐄𝐄 𝐭𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐜𝐨𝐧𝐬𝐮𝐥𝐭𝐚𝐭𝐢𝐨𝐧 𝐚𝐧𝐝 𝐚 𝐅𝐑𝐄𝐄 𝐪𝐮𝐢𝐜𝐤 𝐫𝐞𝐯𝐢𝐞𝐰 𝐨𝐟 𝐲𝐨𝐮𝐫 𝐩𝐫𝐨𝐣𝐞𝐜𝐭.
AI Full stack Developer with 9+ years across Web3 & AI. I build production agents that automate real workflows including RAG, multi-agent systems, trading & onchain automation, blockchain onchain data, Fintech, DeFi, RWA, Payment gateway.
🤖 AI agent work (what I ship now):
- Custom AI agents & copilots - LangGraph, LangChain, CrewAI, OpenAI & Claude APIs
- RAG pipelines grounded in your data - vector DBs, evaluation suites, guardrails against hallucination
- Multi-agent orchestration - planner/worker/reviewer patterns, tool use, memory
- Workflow automation - n8n, Slack/Telegram/WhatsApp bots, CRM & API integrations
- Trading & onchain agents - bots that read markets, execute strategies, and interact with smart contracts safely
⛓️ Web3 foundation (9+ years):
- DeFi protocols - lending, staking, perp DEXs, cross-chain (LayerZero, Axelar)
- Smart contracts - Solidity, Rust, Foundry, audit-ready code
- Wallets & infra - ERC-4337 account abstraction, MPC wallets, rollups (OP Stack, zkSync)
Selected projects:
- Multi-agent AI platform serving live users
- Decentralized perpetual exchange
- AI trading agent with onchain execution and risk limits
- Liquity fork with multi-collateral DeFi architecture
- RAG support agent resolving 60% of tickets automatically
How I work: fixed scope, clear milestones, daily updates, full code ownership on delivery. I'll always recommend the smallest build that gets you a working agent in production — not the biggest.
📩 Send me the workflow you want automated (or the protocol you want built) and I'll reply with a concrete approach within an hours or book a 30-min consultation directly from this profile.
AI Agent Development
AI Chatbot
AI Consulting
AI Development
AI Data Analytics
AI Mobile App Development
Blockchain, NFT & Cryptocurrency
Cryptocurrency
Crypto Exchange Platform
Crypto Wallet Development
Blockchain Development
Blockchain Tokenization
Layer 2 Blockchain
Python
Smart Contract Development
Solidity
Rust
LangChain
Claude
OpenAI API
Bhavya S.
Mohali, India
$28/hr
5.0
8 jobs
Hey! I'm Bhavya, a Senior Software Engineer experienced in building scalable blockchain platforms and production-ready backend architectures for startups and enterprises.
𝗜 𝘀𝗽𝗲𝗰𝗶𝗮𝗹𝗶𝘇𝗲 𝗶𝗻:
𝗦𝗺𝗮𝗿𝘁 𝗖𝗼𝗻𝘁𝗿𝗮𝗰𝘁𝘀 & 𝗢𝗻-𝗖𝗵𝗮𝗶𝗻 𝗣𝗿𝗼𝗴𝗿𝗮𝗺𝘀 (𝗘𝗩𝗠 + 𝗦𝗼𝗹𝗮𝗻𝗮)
• Solidity: ERC-20, ERC-721, ERC-1155, role-based and modular systems
• DeFi logic, staking, vesting, token flows, marketplace mechanisms
• Cross-chain patterns and multi-chain asset logic (L2s, bridges, relayers)
• Contract security, invariant checks, audits, gas optimization
• Solana (Rust): SPL tokens, PDAs, CPI calls, staking/vesting/escrow programs
• Anchor framework and performance-oriented custom Rust programs
𝗪𝗲𝗯𝟯 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴
• Go (advanced) and Rust backend development
• Blockchain indexers, listeners, and event-driven data pipelines
• Wallet abstractions, signer services, automated distribution engines
• RPC/WebSocket integrations and backend-driven smart contract interactions
• High-performance APIs for dashboards, token analytics, or marketplaces
𝗪𝗲𝗯𝟯 𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱
• Next.js / React dApps
• Wallet integrations (MetaMask, WalletConnect, Phantom, Ledger)
• Client-side signing and secure transaction flows
• Applications for minting, staking, swaps, dashboards, and marketplaces
• ethers.js / web3.js / @solana/web3.js integrations
𝗣𝗿𝗼𝗷𝗲𝗰𝘁𝘀 𝗜 𝘄𝗼𝗿𝗸 𝗼𝗻 𝗶𝗻𝗰𝗹𝘂𝗱𝗲:
• Smart contract systems (Solidity / Solana Rust)
• Tokenization, identity systems, marketplaces, and DeFi workflows
• Backend microservices for dashboards, SaaS tools, or launchpads
• Cross-chain applications, high-security wallets, and cryptographic libraries
• Blockchain infrastructure, RPC tooling, and protocol-level extensions
𝗬𝗼𝘂 𝗴𝗲𝘁:
• Clean, maintainable, production-ready code
• Clear communication and proactive problem-solving
• Senior-level product thinking (not just coding tasks)
• Architecture that avoids future technical debt
• Fast execution without compromising quality
𝗜 𝗽𝗿𝗶𝗼𝗿𝗶𝘁𝗶𝘀𝗲 𝗰𝗹𝗮𝗿𝗶𝘁𝘆, 𝘀𝗽𝗲𝗲𝗱, 𝗮𝗻𝗱 𝘆𝗼𝘂𝗿 𝘀𝗮𝘁𝗶𝘀𝗳𝗮𝗰𝘁𝗶𝗼𝗻, 𝗽𝗿𝗼𝘃𝗶𝗱𝗶𝗻𝗴 𝗹𝗼𝗻𝗴-𝘁𝗲𝗿𝗺 𝘀𝘂𝗽𝗽𝗼𝗿𝘁 𝗳𝗼𝗿 𝗲𝘃𝗲𝗿𝘆 𝗱𝗲𝗹𝗶𝘃𝗲𝗿𝘆.
𝗟𝗲𝘁'𝘀 𝗵𝗼𝗽 𝗼𝗻 𝗮 𝗾𝘂𝗶𝗰𝗸 𝗰𝗮𝗹𝗹 𝗳𝗼𝗿 𝘆𝗼𝘂𝗿 𝗻𝗲𝘅𝘁 𝗽𝗿𝗼𝗷𝗲𝗰𝘁!
Smart Contract
Ethereum
Blockchain Security
Web3
NFT Marketplace
React
Web Application Development
Mobile App Development
Golang
DeFi
Crypto Wallet Development
Next.js
Hardhat
Solana
Rust
Juan Manuel S.
Montevideo, Uruguay
$50/hr
5.0
36 jobs
Blockchain Developer and Web3 Engineer with 11+ years, 100% Job Success, and $1M+ delivered on Upwork building smart contracts, DeFi platforms, and AI-powered products.
I specialize in:
- Smart Contract Development (Solidity, Hedera, Hardhat, EVM, Ethereum, Polygon, Solana)
- DeFi Protocols, NFT Platforms & Web3 Integrations
- AI Agent Development (LangChain, OpenAI, GPT-4, custom AI agents)
- Full-Stack Development: React, Next.js, Node.js, NestJS, TypeScript
- Product Discovery, Technical Architecture & Startup MVPs
As CTO and Co-founder of SpaceDev, I lead a team of 20+ engineers that has delivered 160+ projects for clients across the US, Europe, and Latin America. SpaceDev is an AWS Partner and a Hedera ecosystem partner, and holds ISO 27001 certification, the security standard enterprise and fintech clients require before engaging a technical partner. I've been a Forbes Technology Council member since 2023, and our work has been recognized by Clutch (51 five-star reviews, Top 4 global blockchain company).
Some recent work:
- Rarible (leading NFT marketplace): led the multi-chain expansion, migrating core marketplace and collection contracts to Solana and Aptos.
- Drata (GRC/compliance platform): built the cross-platform compliance agent and secure audit hub behind a 4+ year technical partnership.
- NDAX (Canada's first regulated crypto exchange): rebuilt the platform end-to-end, growing user signups 4x and verification success from 50% to 80%.
International speaker on Blockchain and Web3 (Ethereum Argentina, Bitcoin Energy Summit, Blockchain Latam Summit).
Tech stack:
- Blockchain: Solidity, Hardhat, Ethers.js, Web3.js, Ethereum, Polygon, Solana, Hedera
- AI: LangChain, OpenAI, GPT-4, custom AI agents
- Frontend: React, Next.js, TypeScript, Redux
- Backend: Node.js, NestJS, Express, GraphQL, REST
- Databases: PostgreSQL, MongoDB, MariaDB, SQL
- Cloud: AWS (Partner), GCP, Firebase, Heroku
Certifications & Partnerships: AWS Partner, Hedera Partner, ISO 27001 Certified
Looking for a Blockchain Developer, Web3 Engineer, or Smart Contract Developer for your next project? Let's talk. Book a consultation call now.
React
TypeScript
React Native
Node.js
Blockchain Architecture
NestJS
Solidity
Blockchain Development
Smart Contract Development
Web3
DeFi
Ethereum
NFT
AWS Development
AI Development
Rust
Next.js
GraphQL
Solana
API Integration
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