Most blockchain products don't fail because of a bad idea. They fail because of a missed security check, an inefficient contract, poor protocol design, or infrastructure that can't handle real users. Whether it's a DeFi protocol, DEX, staking platform, NFT ecosystem, or token launch, one small mistake can put funds, users, and your reputation at risk. Building secure, scalable blockchain products that perform under real-world conditions is what I focus on.
I'm a blockchain developer with 6+ years of experience designing and building production-ready applications across Solana and EVM ecosystems. I work with startups, Web3 teams, and established companies to turn complex blockchain ideas into reliable products from smart contracts and protocol development to full-stack decentralized applications and backend infrastructure.
Over the years, I've contributed to products that have supported millions of users, routed billions in transaction value, maintained high availability, and powered secure on-chain operations across multiple blockchain networks.
Some of the blockchain products I've worked on :
** High-Performance Solana DeFi Infrastructure** – Built core infrastructure for a Solana ecosystem including a DEX aggregator, validator services, high-performance RPC, and developer SDKs. Worked extensively on transaction optimization, gasless user experiences, MEV-aware routing, and real-time blockchain data streaming to deliver fast and reliable DeFi infrastructure.
**Blockchain Credential Platform** – Developed a platform that issues and verifies permanent digital certificates using compressed NFTs on Solana. The solution enables organizations to create tamper-proof credentials that remain publicly verifiable while significantly reducing on-chain storage costs.
**Web3 Social & NFT Marketplace** – Helped build a decentralized social platform where users can mint content as NFTs, trade digital assets, earn royalties, and manage identities through wallet authentication. The platform included marketplace functionality, referral systems, KYC integration, and scalable backend services.
My technical stack includes Rust, Anchor Framework, Solana Program Library (SPL), Token-2022, Metaplex, Solana Web3.js, Solidity, Ethereum, EVM-compatible chains, DeFi protocol development, DEX architecture, NFT infrastructure, smart contract development, Node.js, TypeScript, React, PostgreSQL, Docker, Kubernetes, AWS, GCP, REST APIs, GraphQL, WebSockets, CI/CD, and comprehensive testing across localnet, devnet, and mainnet environments.
I believe successful blockchain development is about more than writing smart contracts. Every feature is designed with security, performance, maintainability, and long-term scalability in mind. I communicate progress clearly, document important decisions, and deliver thoroughly tested code that teams can confidently deploy to production.
If you're building a DeFi protocol, decentralized exchange, staking platform, token ecosystem, NFT marketplace, Web3 application, or any blockchain product where security and reliability matter, I'd be happy to discuss your project. Even if you're still refining the idea, send me a message I'll provide an honest assessment, recommend the best technical approach, and let you know how I can help bring it to production.
Solidity
Rust
Golang
Cardano
Hyperledger Fabric
Haskell
TypeScript
web3.js
Ethers.js
GraphQL
NFT
Blockchain Development
Game Development
Blockchain
Crypto Wallet
Crypto Wallet Development
Smart Contract Development
Blockchain Security
Blockchain Architecture
Blockchain Tokenization
Navdeep G.
Gurgaon, India
$50/hr
5.0
93 jobs
🥇 𝗘𝗫𝗣𝗘𝗥𝗧-𝗩𝗘𝗧𝗧𝗘𝗗 𝗧𝗢𝗣 1% 𝗢𝗡 𝗨𝗣𝗪𝗢𝗥𝗞 🥇
💭 Ready to leverage cutting-edge, Artificial Intelligence (AI), and Machine Learning technologies and blockchain to transform your business?
𝐈 𝐦𝐢𝐠𝐡𝐭 𝐧𝐨𝐭 𝐛𝐞 𝐭𝐡𝐞 𝐟𝐢𝐫𝐬𝐭 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 𝐲𝐨𝐮'𝐥𝐥 𝐡𝐢𝐫𝐞 𝐡𝐨𝐰𝐞𝐯𝐞𝐫 𝐈 𝐜𝐚𝐧 𝐛𝐞 𝐭𝐡𝐞 𝐥𝐚𝐬𝐭 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 𝐲𝐨𝐮'𝐥𝐥 𝐞𝐯𝐞𝐫 𝐧𝐞𝐞𝐝.
I can build you an
• AI Appointment Setter
• AI Salesman
• AI Outbound Calls
• AI Inbound Calls
• AI Custom Applications
• AI Marketing
• AI Chatbots
🤖 𝗔𝗿𝘁𝗶𝗳𝗶𝗰𝗶𝗮𝗹 𝗜𝗻𝘁𝗲𝗹𝗹𝗶𝗴𝗲𝗻𝗰𝗲 & 𝗠𝗮𝗰𝗵𝗶𝗻𝗲 𝗟𝗲𝗮𝗿𝗻𝗶𝗻𝗴:
• Generative AI modeling and machine learning insights to enhance business efficiency and innovation.
💬 𝗖𝗵𝗮𝘁𝗯𝗼𝘁 𝗮𝗻𝗱 𝗕𝗼𝘁 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁: - Engage your audience with state-of-the-art chatbots using advanced Natural Language Processing and the ChatGPT API, including OpenAI Assistants. 🔗 𝗢𝗽𝗲𝗻𝗔𝗜
𝗔𝗣𝗜 𝗮𝗻𝗱 𝗚𝗣𝗧 𝗔𝗣𝗜 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻: - Seamlessly integrate OpenAI products and GPT technologies with LLM Prompt Engineering for superior results. • OpenAI APIs • ChatGPT API Integration • OpenAI Assistants
💻 𝗙𝘂𝗹𝗹-𝗦𝘁𝗮𝗰𝗸 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 & 𝗔𝗣𝗜 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻: • Comprehensive full-stack development services from backend to frontend, ensuring smooth integration with your existing APIs.
📈 𝗟𝗲𝗮𝗱 𝗚𝗲𝗻𝗲𝗿𝗮𝘁𝗶𝗼𝗻 𝗧𝗼𝗼𝗹𝘀: • Maximize your potential with AI-driven lead generation and chat plugins.
📱 𝗔𝗜 𝗠𝗼𝗯𝗶𝗹𝗲 𝗔𝗽𝗽 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁: • Transform user engagement with AI-powered mobile apps designed for maximum impact.
✅ Building your AI SaaS / Create AI Applications
✅ Integrate Existing APIs
✅ Automate workflows
✅ Build a custom Chatbot , AI Chatbot
✅ Integrating OpenAI GPT-3, GPT-4 , ChatGPT API into your business flow
✅ Build Smart Chatbots or Smart Conversational & Generative AI
✅ Reduce your Business workload with Prompt Engineering based solutions
✅ Finetune OpenAI gpt-3 LLM as per your needs
✅ Fine-Tune your writing / Generative AI Writing
✅ AI powered Assistant
✅ AI and machine learning / Develop your own AI Models
✅ AI Art , DALL-E 3
I'm Full-Stack Developer with over four years of experience. I use modern AI such as chatgpt, gpt-3, OpenAI, GPT4 models to provide custom AI driven solutions. I'm really good at making websites and complete applications. I use Python to do cool things like automating tasks and creating smart chatbots. If you have ideas, I can help bring them to life and the latest AI technology.
Think of me as your trusty Developer, ready to team up with you to make your projects a reality
*Blockchain expertise*
Expert in Blockchain and Cryptocurrency (end to end solutions) and DLT (Distributed Ledger Technology).
I have been into all kinds of blockchain projects like Smart contract, Wallet creation, Token creation, Integrating the wallet, website and app creation, whitepaper creation and building crypto exchange/trading platform for Bitcoin and other Cryptocurrencies such as Dash, Ethereum, and Litecoin, etc.
I can help you with the development of the pilot version of the Peatio crypto open-source exchange. I can help you in setting up the trading pairs ERC 20, ETH, Bitcoin, and 2 ERC20 tokens, FIAT currency with good UI/UX experience along with high encryption and Setting up crypto-currency custodian system using the principle of multi-tier wallet management with Hot, Warm and Cold wallets.
Blockchain Development majorly performs by JavaScript, .net core with Linux deployment because reverse engineering is not possible but some solutions are only possible with JavaScript framework, C and C++ and Golang and we achieved 50000 per second.
As a business specialist, my primary focus is on the growth of my partner and customer with the latest technology and the latest techniques. Even I have worked with international Government companies in the US Blockchain domain.
Secondary focus is to make “Revinfotech” People leaders in Blockchain, Cryptocurrency, ICO, IOT, UI/UX, cloud, web and mobile, machine learning to brand equity using offline to online strategies. With the help of premiere markets research companies like Nielsen, McKinsey, and IPSOS. Even I setup brand regionally to national to international. My team did more than 30+ Blockchain Projects till now and one of my projects is generating 10000 Ethereum in one month
I have hands-on experience in bootstrapping and successfully operating a startup. During the last couple of years, he has witnessed and mastered all phases of the business venture life cycle including conceptualization, leadership, resource management, business development, and expansion. With an experience which includes managing, producing and overseeing digital applications, I have gathered and built upon the expertise and consumer value in the internet and mobile space.
C++
Smart Contract
Prototyping
Solidity
Blockchain Development
Cryptography
JavaScript
Blockchain
Blockchain Architecture
Hyperledger Fabric
DApps
Ethereum
Bitcoin
Surya Pratap S.
Gurgaon, India
$25/hr
5.0
1 jobs
Experience in Blockchain technologies with multiple blockchain platforms bitcoin, ethereum, Hyperledger fabric, EOS
Cryptocurrency
Bitcoin
Blockchain Development
IBM Blockchain
Solidity
Node.js
React
MongoDB
TypeScript
PostgreSQL
Rust
Next.js
Python
Machine Learning
Artificial Intelligence
Vikas S.
Gurgaon, India
$6/hr
4.2
31 jobs
Hello!
I’m a Full Stack Developer & Blockchain Architect with 10+ years of experience building high-performance web applications, decentralized platforms, enterprise systems, and AI-powered products. I help startups and enterprises transform ideas into secure, scalable, and future-ready digital solutions.
With deep expertise across Frontend, Backend, Cloud, DevOps, Web3, Smart Contracts, AI, and Enterprise Architecture, I deliver end-to-end systems with clean code, strong security, and seamless user experiences.
🔷 Why Work With Me:
✓ High-quality, professional work with attention to detail
✓ No upfront payment — pay only when satisfied
✓ 100% client satisfaction & long-term support
✓ On-time delivery with Agile methodology
✓ Clear communication, strong architecture mindset, and proactive problem-solving
🔷 Core Expertise:
📌 Full Stack Development:
- 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: React.js, Next.js, Vue.js, Angular, JavaScript, TypeScript, HTML5, CSS3, GraphQL, Socket.IO
- 𝐁𝐚𝐜𝐤𝐞𝐧𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: Node.js, Express.js, Nest.js, Python (Django, Flask, FastAPI), PHP (Laravel, CodeIgniter, WordPress), Java (Spring Boot)
- 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞𝐬: MongoDB, MySQL, PostgreSQL, Amazon RDS, SQL
- 𝐂𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬: AWS (EC2, S3, RDS, Lambda, Docker, Kubernetes), GCP, Firebase, CI/CD Pipelines
📌 Blockchain, Web3 & Smart Contracts:
- 𝐁𝐥𝐨𝐜𝐤𝐜𝐡𝐚𝐢𝐧 𝐏𝐥𝐚𝐭𝐟𝐨𝐫𝐦𝐬: Ethereum, BSC, Polygon, Avalanche, Fantom, Hyperledger Fabric, Quorum, R3 Corda, Solana
- 𝐒𝐦𝐚𝐫𝐭 𝐂𝐨𝐧𝐭𝐫𝐚𝐜𝐭 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: Solidity, Rust, ERC20, ERC721, ERC1155, DeFi, Staking, Vesting, Governance
- 𝐖𝐞𝐛𝟑 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧: Web3.js, Ethers.js, WalletConnect, MetaMask, Solana Web3
- 𝐓𝐞𝐬𝐭𝐢𝐧𝐠 & 𝐒𝐞𝐜𝐮𝐫𝐢𝐭𝐲: Hardhat, Truffle, Mocha, Chai, Slither, Smart Contract Audits
- 𝐄𝐧𝐭𝐞𝐫𝐩𝐫𝐢𝐬𝐞 𝐁𝐥𝐨𝐜𝐤𝐜𝐡𝐚𝐢𝐧: Hyperledger, Permissioned Networks, Chaincode Development
🔷 AI, GenAI & Machine Learning:
✓ Generative AI Solutions (ChatGPT, LLMs, image/content generation)
✓ AI/ML Model Development & Deployment
✓ NLP, Recommendation Engines & Predictive Analytics
✓ Integrations: OpenAI, LangChain, HuggingFace, TensorFlow, PyTorch
✓ AI-powered chatbots, automation & workflow intelligence
🔷 APIs & Integrations:
✓ Authentication (Auth0, Google, Apple, JWT)
✓ Payment Gateways (Stripe, PayPal, Crypto, AmazonPay)
✓ Cloud APIs (AWS, Firebase, GCP)
✓ Communication APIs (Twilio, Nexmo, MessageBird)
✓ Marketing APIs (HubSpot, Zoho, Mailchimp, Mailgun)
🔷 Industries Served:
Education, Finance, Health & Fitness, Real Estate, Consumer Goods, Fashion, Sports, Business Services - and beyond.
If you’re looking for a high-level Full Stack + Blockchain + AI expert who understands business goals, writes secure scalable code, and delivers beyond expectations.
Looking forward to a long-term, win-win partnership.
Best Regards,
Vikas Siwach
Node.js
React
JavaScript
API Integration
Web Development
Next.js
Python
Django
MongoDB
PostgreSQL
Angular
ExpressJS
AI Agent Development
TypeScript
Full-Stack Development
Janmejay A.
Gurgaon, India
$40/hr
4.6
55 jobs
As a seasoned developer with over 8 years of hands-on experience, I have completed 300+ successful projects across various industries. My focus lies on blockchain technology and artificial intelligence, particularly L1/L2 EVM chains. Problem-solving is my forte, and I thrive on tackling tough technical issues that push boundaries! 🧠💡
🔧 𝐁𝐥𝐨𝐜𝐤𝐜𝐡𝐚𝐢𝐧 𝐌𝐚𝐬𝐭𝐞𝐫𝐲: Over the years, I’ve forked and deployed multiple blockchains, incorporating unique modifications to meet specific client requirements. From decentralized exchanges to lending protocols, I’ve developed robust systems designed to handle real-world use cases and drive innovation in the cryptocurrency space.
🔥 𝐑𝐞𝐜𝐞𝐧𝐭 𝐍𝐨𝐭𝐚𝐛𝐥𝐞 𝐏𝐫𝐨𝐣𝐞𝐜𝐭𝐬:
1. 𝐄𝐝𝐮𝐛𝐥𝐨𝐜𝐤 (𝐟𝐨𝐫 𝐂𝐥𝐚𝐬𝐬𝐭𝐞𝐫): Spearheaded the development of an education-focused blockchain solution.
2. 𝐍𝐞𝐬𝐭𝐞𝐝 (𝐟𝐨𝐫 𝐀𝐝𝐫𝐨𝐢𝐭 𝐏𝐞𝐨𝐩𝐥𝐞): Delivered a cutting-edge decentralized investment platform.
3. 𝐂𝐫𝐨𝐬𝐬𝐓𝐨𝐰𝐞𝐫: Played a pivotal role in creating a multi-functional crypto trading platform.
4. 𝐂𝐋𝐀𝐘 & 𝐁𝐔𝐂𝐊: Developed secure blockchain-based solutions for a leading media company.
🎯 𝐔𝐩𝐰𝐨𝐫𝐤 𝐀𝐜𝐡𝐢𝐞𝐯𝐞𝐦𝐞𝐧𝐭𝐬:
1. 100% 𝐉𝐨𝐛 𝐒𝐮𝐜𝐜𝐞𝐬𝐬 𝐒𝐜𝐨𝐫𝐞 🏆: I take pride in maintaining a perfect job success score, a testament to my commitment to delivering top-tier results.
2. 4,000+ 𝐇𝐨𝐮𝐫𝐬 𝐋𝐨𝐠𝐠𝐞𝐝 ⏱️: My extensive Upwork track record reflects my dedication and work ethic, having logged over 4,000 hours across a wide array of projects.
3. 𝐓𝐨𝐩 𝐑𝐚𝐭𝐞𝐝 𝐏𝐥𝐮𝐬 𝐅𝐫𝐞𝐞𝐥𝐚𝐧𝐜𝐞𝐫 💼: As a Top Rated Plus freelancer, I consistently provide premium solutions that exceed client expectations.
I am driven by my passion for technology and innovation, and I always aim to deliver high-quality, scalable solutions that bring real value to my clients.
🌟🚀 Check out my glowing Upwork reviews to see the exceptional track record I’ve built over the years! ✨💯
Web Development
Google Chrome Extension
Laravel
PHP
React
Full-Stack Development
Solidity
Smart Contract
Cryptocurrency
Blockchain Development
DApps
Mobile App
Flutter
Ethereum
React Native
Sachin G.
Gurgaon, India
$30/hr
4.5
94 jobs
Hi, I’m Sachin, a technology consultant and digital transformation expert with a 1000+ member team delivering world-class solutions for startups, enterprises, and Fortune 500 companies.
🏆 Fast Facts About Us:
✔ 25+ years of experience in global technology consulting
✔ 1000+ highly skilled developers, designers & strategists
✔ 1,500+ successful projects across industries
✔ 441,962+ Upwork hours logged
✔ Top Rated Plus with a 100% Success Rate
✔ Recognized in Deloitte Technology Fast 500 APAC (2013 & 2015)
💡 Our Core Expertise:
🔹 Mobile Apps: iOS, Android, Flutter, React Native, Ionic
🔹 Web Development: PHP, Python, .NET, Java, MEAN/MERN, Django
🔹 AI & Machine Learning: Chatbots, NLP, Predictive Analytics, Computer Vision
🔹 Blockchain: Ethereum, Smart Contracts, DeFi, NFTs, Hyperledger
🔹 Enterprise Solutions: Salesforce, SharePoint, Documentum
🔹 Cloud & DevOps: AWS, Azure, GCP, Kubernetes, Terraform, CI/CD
🔹 Cybersecurity & Compliance: Penetration Testing, SOC 2, GDPR Compliance
🔹 Testing & QA: Automation, Manual, Performance & Security Testing
🌍 Industries We Serve:
Healthcare & MedTech | FinTech & Banking | Retail & eCommerce | Automotive & Logistics | EdTech & eLearning | Media & Entertainment | Startups & SaaS
📩 Let’s connect and discuss how we can help you achieve your goals!
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