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Robert Spadinger's avatar
Robert Spadinger
Paris, France
Solidity smart contract developer and auditor.
Solidity smart contract developer and auditor.
Cover image for Smart Contract Audit for Vultisig
Smart Contract Audit for Vultisig
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12
Cover image for Arbitrage Trading Bot
Arbitrage Trading Bot
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12
Cover image for Solidity Smart Contract Development Course
Solidity Smart Contract Development Course
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8
Cover image for EventChain - Event Management DApp
EventChain - Event Management DApp
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4
Hardhat(5)
Chetan Kumar's avatar
Chetan Kumar
Malerkotla, India
Full Stack Dev | AI Engineer | Web3 & Blockchain Dev
Full Stack Dev | AI Engineer | Web3 & Blockchain Dev
Cover image for WalletX is a revolutionary multi-chain
WalletX is a revolutionary multi-chain DeFi platform that introduces the world's first temporary wallet technology combined with AI-powered user assistance and comprehensive QR code integration. • This groundbreaking platform operates across 8 EVM networks including Base, Lisk, Polygon, Ethereum, BNB, ZetaChain, Somnia, and Citrea, providing a unified DeFi experience with advanced escrow functionality. • The platform features innovative disposable wallet creation for enhanced privacy and security, smart contract-powered trustless P2P transactions, and integrated Gemini AI assistance for real-time user support. • WalletX includes complete QR code generation and scanning capabilities, AWS SNS email notifications for transaction alerts, and professional mobile-responsive design. • The platform addresses real-world DeFi challenges including trust issues in P2P transactions, privacy concerns, and complex multi-chain interactions. • With its production-ready architecture, advanced security measures, and innovative features, WalletX sets new standards for DeFi platforms and multi-chain wallet management. LIve : https://walletx.software
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117
Cover image for AgriChain is a revolutionary blockchain-based
AgriChain is a revolutionary blockchain-based agricultural supply chain platform that creates direct connections between farmers and consumers through transparent, secure, and traceable transactions. • Built with cutting-edge Web3 technologies and React 19, this comprehensive platform eliminates intermediaries in agricultural trade while ensuring complete transparency and security through blockchain technology. • The platform features advanced IPFS integration for decentralized file storage, multi-network support across Ethereum, Polygon, and Base networks, and sophisticated smart contract-based escrow systems. • Farmers can register produce with quality certificates, manage inventory, and receive secure payments, while consumers enjoy direct access to fresh produce with complete traceability and quality verification. • The platform includes real-time order management, delivery tracking, automated refund systems, and comprehensive analytics dashboards. • With its modern responsive design, advanced blockchain integration, and focus on agricultural sustainability, AgriChain represents the future of agricultural commerce and supply chain management.
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149
Cover image for Sortify: Ball Sort Puzzle (Android
Sortify: Ball Sort Puzzle (Android Game) Developed and published a complete Android puzzle game focused on color sorting mechanics, user engagement, and brain-training gameplay. Key Contributions • Designed and developed the complete game from concept to production release. • Published successfully on Google Play Store under CK Tech Hub. • Built smooth and responsive gameplay with intuitive touch controls. • Implemented Undo, Restart, and Hint systems to improve user experience. • Designed a modern and engaging UI optimized for mobile devices. • Created multiple challenging puzzle levels with increasing difficulty. • Optimized game performance for Android devices running Android 10+. • Integrated Google Play Store listing, screenshots, promotional assets, and release management. • Achieved a 4.9★ user rating with positive player feedback. • Focused on cognitive skill development, logical thinking, and problem-solving mechanics. Link: https://play.google.com/store/apps/details?id=com.cktechhub.games&hl=en_IN
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122
Cover image for Tic Tac Toe – Android
Tic Tac Toe – Android Mobile Game Developed and published a modern Tic Tac Toe mobile game for Android, designed to provide an engaging and interactive gaming experience for users of all age groups. The game features intelligent AI gameplay, smooth animations, responsive controls, and an optimized mobile-first design. Key Contributions • Designed and developed the complete game architecture from concept to deployment. • Implemented single-player gameplay with AI-powered opponent logic. • Created a clean and intuitive user interface for seamless gameplay. • Developed game state management, win detection algorithms, and score tracking systems. • Optimized performance to ensure smooth gameplay across Android devices. • Implemented responsive layouts compatible with multiple screen sizes. • Successfully published and managed the application on Google Play Store. • Maintained application updates, bug fixes, and performance improvements through multiple releases. LInk: https://play.google.com/store/apps/details?id=com.cktechhub.tictactoe&hl=en_IN
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62
Hardhat(1)
Lionel Tangbe 's avatar
Lionel Tangbe
Cotonou, Benin
FinTech & Web3 Infrastructure Consultant | Payments & Stable
New to Contra
FinTech & Web3 Infrastructure Consultant | Payments & Stable
Cover image for Digital Ownership & On-Chain Asset
Digital Ownership & On-Chain Asset Infrastructure Built a Web3 digital asset platform for minting, storing and managing blockchain-based ownership records. The architecture combines Solidity smart contracts, NFT minting, IPFS metadata storage, wallet integration and a Web3 application layer. The system was designed to separate on-chain ownership logic from off-chain metadata while keeping the user experience simple and auditable. Key components include asset minting, metadata management, wallet connectivity, contract interaction and testnet deployment.
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20
Cover image for Aegis Web3 Architecture Smart Contract &
Aegis Web3 Architecture Smart Contract & Web3 Infrastructure Architecture Designed a modular Web3 architecture combining Solidity smart contracts, Hardhat testing, TypeScript integration, backend services, and deployment workflows. The project focused on secure contract design, clean separation between on-chain and off-chain components, testing, deployment readiness, and extensibility for production Web3 applications. #Solidity #Web3 #SmartContracts #Ethereum #Blockchain
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23
Cover image for Stablecoin Payment & Settlement Infrastructure Designed
Stablecoin Payment & Settlement Infrastructure Designed a production-oriented digital asset payment infrastructure for businesses integrating stablecoin payments and blockchain settlement. The architecture covers payment orchestration, wallet interactions, transaction monitoring, settlement workflows, reconciliation and compliance-ready integration points.
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22
Cover image for Built a public testnet prototype
Built a public testnet prototype for tokenized real-world asset infrastructure. VaultX combines opportunity discovery, compliance readiness, wallet connectivity, smart-contract-aware transaction controls, and portfolio operations in one investor workspace. The focus was on designing a clear path from RWA discovery to compliant on-chain execution while keeping the architecture modular for future custody, KYC, servicing, and oracle integrations. #FinTech #Web3 #RWA #Blockchain #DigitalAssets
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20
Hardhat(2)
Abolaji Adedeji's avatar
Abolaji Adedeji
Dubai - United Arab Emirates
Expert blockchain developer & auditor securing your dApps
Expert blockchain developer & auditor securing your dApps
Cover image for Decentralized Crowdfunding Platform
Decentralized Crowdfunding Platform
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5
Cover image for Security Audit Reports
Security Audit Reports
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4
Cover image for Multidex Arbitrage Bot
Multidex Arbitrage Bot
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4
Cover image for Yield Farming with Leverage on Ethereum Layer-2
Yield Farming with Leverage on Ethereum Layer-2
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6
Hardhat(1)
Saad Raja's avatar
Saad Raja
Pakistan
Fullstack Blockchain Developer | Smart Contracts Integration
7
Followers
Fullstack Blockchain Developer | Smart Contracts Integration
Cover image for Fundraiser - Create, Donate & Build a Strong Community
Fundraiser - Create, Donate & Build a Strong Community
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6
Cover image for DevTools - a Directory for Developer tools
DevTools - a Directory for Developer tools
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21
Cover image for BabyBliss - an ecommerce site for Newborn Baby Items
BabyBliss - an ecommerce site for Newborn Baby Items
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11
Cover image for TokenNow - Create & Trade Real Estate Tokens (RWAs)
TokenNow - Create & Trade Real Estate Tokens (RWAs)
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7
Hardhat(1)