I help founders, fintechs, and Web3 companies design and build blockchain-based financial products that work in the real world, from business model and token structure to smart contracts, payment flows, and execution. I’m a fintech founder, CTO, blockchain product builder, and PhD-trained data scientist working at the intersection of: -Blockchain and smart contract development -Stablecoins and crypto payment rails -Real-world asset tokenization -Real estate investment structures -Cross-border payments -Regulated financial products -Data-driven financial systems I've built ventures in Brazil that include: HausBank / HausFinance — fintech infrastructure for payments, financial operations, and international remittance flows TokenHaus / EFIX — a real-world asset tokenization platform focused on regulated investment offerings BRTH — a Brazilian real-denominated stablecoin initiative, including smart contracts, swap logic, FX pricing, and crypto-to-BRL infrastructure Real estate tokenization structures — including SPV-based models, investor payout logic, and asset-backed investment products I don’t approach blockchain from a purely theoretical angle. I build while dealing with the actual constraints: regulation, liquidity, compliance, smart contract design, user flows, unit economics, and business viability. What I can help you with: Blockchain & Smart Contract Development Solidity smart contract architecture ERC-20 token design and implementation Stablecoin contracts and mint/burn logic Swap contracts using oracle-based pricing Chainlink oracle integrations On-chain fee mechanisms and treasury logic DeFi liquidity and peg-maintenance architecture Smart contract product specifications and technical review Web3 system design on EVM-compatible chains such as Polygon Stablecoins, Crypto Payments & Cross-Border Flows Stablecoin business models and monetization Fiat ↔ crypto payment architecture USDC / BRL / PIX settlement structures FX pricing, spreads, fees, and treasury design Crypto payment rails for international contractors, marketplaces, and platforms On-ramp / off-ramp product strategy RWA & Real Estate Tokenization Tokenization business strategy Real estate token offering models SPV / receivable / revenue-sharing structures Investor return mechanics and payout logic Tokenized credit and asset-backed product design Whitepaper, deck, and token economics review Fintech Product Strategy Fintech products from zero to launch Payment workflows and split-payment logic Embedded finance and BaaS-based models Marketplace payments, escrow, and commission flows Revenue model design and profitability analysis Why clients hire me I combine five profiles rarely found in one person: -Founder: I understand business constraints, speed, and trade-offs -CTO: I turn strategy into systems and execution -Blockchain builder: I design and develop smart contract-based products -Fintech operator: I work with payments, remittances, and financial workflows -PhD-level quantitative expert: I model economics, forecast, pricing, risk, and viability rigorously I connect the full stack: Business model → Token design → Smart contracts → Financial mechanics → Product architecture → Execution roadmap Selected experience -HausBank / HausFinance: founder and technology leader building fintech infrastructure for payments and remittances -TokenHaus / EFIX: tokenized investment product design for real-world assets BRTH: stablecoin architecture, Solidity contracts, oracle-based FX logic, swap mechanisms, and liquidity strategy -Real estate tokenization: SPV-based structures, investor distributions, and construction-phase yield models Before building my current ventures, I led data and growth teams in high-scale businesses: Wildlife Studios: led data science, pricing, bidding, and marketing performance teams across multiple countries Blu: founded and scaled the data team from 1 to 18 people; built models that improved retention, reduced churn, and increased sales IBGE: R&D Manager and Brazil’s representative in the UN Global Working Group on Big Data for Official Statistics FGV: former Machine Learning lecturer Credentials PhD in Industrial Engineering (ML and Time Series Forecasting) MSc in Electrical Engineering (Time Series) BS in Statistics Published researcher in the International Journal of Forecasting and Journal of Air Transport Management I’m especially valuable when you need to: Build a blockchain, smart contract, or token-based financial product Design a stablecoin, crypto payment, or on/off-ramp business Structure an RWA or real estate tokenization product Review a Web3 / fintech architecture before engineering starts Develop smart contract logic tied to real business flows Create financial models, unit economics, and monetization strategies Translate a complex idea into a clear product and execution plan If you’re building a fintech, stablecoin, smart contract, tokenization, or real-world asset product, let's talk

ETHIstanbul 2025 1st place winner. I build production-ready Web3 applications that actually ship. Currently working full-time as a Software Engineer at a web3-focused company. I've been building dApps since 2022: smart contracts, full-stack integrations, and everything in between. What I work with: Smart Contracts: Solidity, security-first approach Frontend: TypeScript, React, Next.js Web3 stack: ethers.js, wagmi, The Graph, IPFS Bonus: ZK proofs, identity systems What I've built: Cryptle — ETHIstanbul 2025 1st place winner ZK-based voting application Cortex — Productivity desktop app written in Tauri (Rust) Multiple hackathon projects across ETHGlobal and other web3 hackathons I'm not a freelancer who disappears after delivery. I ask product-level questions, write clean code, and care about what you're actually building. Looking for: Web3 projects (dApps, smart contracts, integrations) and full-stack web applications. If you need clean code and someone who thinks about the product, not just the ticket, let's talk.

Web3 developer and blockchain architect specializing in smart contract development (Solidity), DeFi protocols, and trading bot systems. I build: smart contracts, DeFi/CeDeFi platforms, wallet integration, token-gated systems, trading bots, blockchain APIs, RollUp, Oracle, CrossChain Bridges. I consider: Security, Scalability, Cost, Decentralization, Performance, Tokenomics Tech: Solidity,Smart Contracts, Web3.js, Ethers.js, Node.js, TypeScript, Python, Ethereum, Polygon, Arweave, IPFS, gas fee, Familiar with : Bitcoin, Ethereum, Solana, Arbitrum, OP Stack, Base, Polygon, BSC, Tron, EOS, Fabric, Oracle, Chainlink, LayerZero, CCIP, Wormhole, AA wallet (Account Abstraction), DePIN, Recent work: CeDeFi institutional infrastructure, Web3 archival system with wallet auth, DePIN Layer 2 blockchain.

I build blockchain applications, DeFi protocols, and AI-powered solutions that help businesses launch crypto products, automate processes, and enter Web3 markets generating measurable ROI. Most clients hire me after trying to build blockchain systems themselves and getting stuck on smart contract security, or after needing AI integration into existing applications but lacking technical expertise. I have developed 50 plus blockchain and AI projects over 10 years including DeFi platforms handling multi-million dollar TVL, cross-chain bridges, AI trading systems, and enterprise blockchain solutions. BLOCKCHAIN DEVELOPMENT SERVICES Smart Contract Development Building production-ready smart contracts in Solidity for ERC20 tokens, NFT collections, staking protocols, DeFi vaults, governance systems. Security-focused development preventing exploits and vulnerabilities. DeFi Protocol Development Complete DeFi platforms including DEX integration with Uniswap and Sushiswap, cross-chain bridges using LayerZero and Chainlink CCIP, liquidity pools and yield farming, token vesting and distribution systems. Recent: Built AI-driven DeFi vaults managing multi-million TVL across 6 chains. Cross-Chain Solutions Multi-chain applications supporting Ethereum, BSC, Polygon, Arbitrum, Optimism, Base, Solana. Cross-chain token swaps, bridge implementations, unified liquidity across networks. Integrated Stargate, LiFi, 1inch for optimal routing. NFT and Token Systems NFT minting platforms, marketplace smart contracts, token launch systems, airdrop and claim mechanisms. Chainlink VRF integration for provably fair randomness in lottery and gaming contracts. Blockchain Backend Development High-performance APIs using FastAPI and Node.js with Web3 integration. Real-time transaction monitoring, wallet integration, multi-database architecture (MongoDB, PostgreSQL), async processing for scalability. AI AND ML INTEGRATION AI-Powered DeFi Systems ML-based portfolio optimization algorithms, intelligent rebalancing strategies, predictive analytics for trading, automated risk management. Built AI trading bot execution engine processing real-time market data. AI Document Intelligence Vector search systems using Milvus and Redis, document chunking and embeddings, semantic search across legal and business data, AI-powered data extraction from PDFs and documents. Computer Vision Systems Image verification models for authentication, logo and signature validation, ML-based fraud detection, automated visual inspection systems. TECHNICAL STACK Blockchain: Solidity, Web3.js, Ethers.js, Hardhat, Foundry, Remix Chains: Ethereum, BSC, Polygon, Arbitrum, Optimism, Base, Solana DeFi: Uniswap, Chainlink, LayerZero, Stargate, 1inch, LiFi AI/ML: Python, FastAPI, OpenAI, Hugging Face, TensorFlow Backend: Node.js, NestJS, Go, Rust, TypeScript Databases: MongoDB, PostgreSQL, Redis, Supabase Frontend: React, Next.js, Web3 wallets integration DevOps: Docker, Kubernetes, AWS, CI/CD RECENT BLOCKCHAIN PROJECTS Multi-Chain DeFi Platform Architected AI-driven investment vaults across 6 blockchains handling millions in TVL. ERC4626 vault implementation, Chainlink price feeds, automated rebalancing, cross-chain liquidity management. Cross-Chain Bridge Development Built token bridge enabling swaps between EVM and non-EVM chains. LayerZero integration, secure smart contracts, multi-signature security, gas optimization. Enterprise Blockchain System Developed anti-fraud blockchain for banking handling millions in interbank transactions. Hyperledger Fabric with GoLang smart contracts, ML-based verification, microservices architecture on AWS. AI Trading System Created trading bot with smart contract execution engine. Real-time market analysis, automated portfolio optimization, multi-exchange integration, risk management algorithms. BUSINESS IMPACT DELIVERED: Multi-million dollar DeFi protocols securing significant TVL Cross-chain bridges processing thousands of transactions daily AI systems reducing fraud detection time by 80 percent Smart contracts passing security audits without critical issues Enterprise blockchain cutting transaction processing costs by 60 percent HIRE ME IF: You want to launch DeFi protocol or crypto token You need smart contracts audited and optimized for security You require cross-chain bridge or multi-chain application You want AI features integrated into blockchain systems You need enterprise blockchain for supply chain or finance You require technical architecture for Web3 product WHAT YOU RECEIVE: Production-ready smart contracts Security-audited code Multi-chain deployment Complete documentation Integration support Post-launch maintenance READY TO BUILD: If your business needs blockchain development, DeFi protocol, or AI integration, send me your project requirements. I will respond with technical approach and business impact analysis within 24 hours.

I’m a senior AI Architect and Blockchain Developer with 10+ years of experience delivering intelligent, secure, and scalable systems. I specialize in Generative AI (LLMs, RAG, agents), edge computer vision, smart contract development, and full-stack automation. Whether you're building an AI-driven assistant, a DApp, or a cross-domain solution that blends both worlds — I can design, build, and deploy it from MVP to production. 🧠 AI Projects (LLMs · RAG · Voice AI · CV · Automation) ✅ Document Intelligence Agent – LangChain + GPT-based system extracting and summarizing legal clauses, reducing review time by 80%. ✅ Multi-Agent Sales Assistant – GPT-4o agents for lead qualification, email generation, and CRM automation (Salesforce, HubSpot). ✅ Voice-Enabled Medical Assistant – Whisper + GPT solution for data capture and record automation (HIPAA-compliant). ✅ Edge Vision Pipeline – YOLOv9 object detection deployed on Jetson Orin for inventory monitoring and safety systems. ✅ RAG Helpdesk Bot – Deployed contextual chatbot that resolved 65%+ user queries on Microsoft Teams with Pinecone + LangGraph. 🔗 Blockchain Projects (Smart Contracts · DApps · NFTs · DAO) ✅ ERC‑20/721/1155 Contracts – Built secure, audited smart contracts with custom minting, royalty logic, staking modules. ✅ Legal Notarization DApp – Stored signed documents on IPFS + Ethereum for immutable compliance trails. ✅ NFT Utility Platform – NFT staking + reward logic on Polygon using Hardhat, OpenZeppelin, and React. ✅ DeFi Bot – Monitored token activity and gas usage using Chainlink + The Graph, delivering alerts via Telegram API. ✅ DAO Proposal Tracker – Queried governance contracts and visualized community voting data via ethers.js. 🔁 AI + Blockchain Combined Projects (Cross-Domain Innovation) ✅ DAO Proposal Summarizer – GPT-4 + RAG bot that reads on-chain proposals and predicts voting impact from smart contracts. ✅ NFT Metadata AI Agent – LangChain agent auto-generating content, tags, and rarity summaries from on-chain NFT data. ✅ Voice-to-DAO Voting System – Whisper + GPT agent to translate speech into signed DAO transactions on Ethereum. ✅ AI Wallet Assistant – Conversational bot to track wallet activity, gas usage, token spikes using OpenAI + Web3.js. ✅ Audit Agent – GPT-powered smart contract analyzer generating plain-language summaries from AST + vulnerability scans. 🛠 Tech Stack Snapshot GenAI & LLMs: GPT-4o, Claude 3, Mistral, LLaMA 3, Gemini, LangChain, LangGraph, CrewAI, AutoGen, BabyAGI Vector DBs: Pinecone, Qdrant, ChromaDB, Weaviate, FAISS, Azure Cognitive Search Blockchain: Solidity, Hardhat, Ethers.js, Web3.js, OpenZeppelin, Chainlink, IPFS, The Graph, ERC standards Voice/CV/Edge AI: Whisper, ElevenLabs, Deepgram, YOLOv9, OpenPose, DeepStream 7.x, Triton, Jetson Orin/Nano Cloud/Infra: Azure, AWS, GCP, OCI, Docker, Kubernetes, Terraform, Serverless (Lambda, Azure Functions) Full Stack: Python, FastAPI, Node.js, React, Streamlit, GraphQL, REST Automation: n8n, Make, Power Automate, Zapier, Pipedream CRM/ERP Integration: Salesforce, HubSpot, Notion, SharePoint, MS Teams, Monday.com 💡 Over the years, I’ve worked across these tools to deliver integrated, secure, and ROI-driven solutions—both independently and in combination. 💬 Why Clients Hire Me 🚀 Rapid MVPs – Get working prototypes in 7–10 days 🔐 Enterprise Ready – Compliance with GDPR, HIPAA, audit trails 💬 Clear Collaboration – Daily updates, milestone tracking, zero guesswork 🧩 AI + Blockchain Fluency – Deep knowledge across both stacks 📈 Proven Impact – 100+ projects delivered with measurable business outcomes 📩 Let’s turn your idea into a powerful AI, Blockchain, or hybrid solution. Drop me a message — I’ll help you get there.

I’m a top-rated Upwork freelancer helping crypto, blockchain, and AI projects scale through full-stack marketing that delivers real users, funding, and traction, not vanity metrics. 🏆 Projects I’ve Worked On: - Hedera - Algorand - Ubisoft’s Web3 Arm - EOS Network (Vaulta) - Exodus Wallet - Token Metrics 🔧 What I Offer: 📱 Social Media Management – X, Discord, Telegram, YouTube 📰 Free PR & Publication Campaigns 🤝 Warm VC Intros – 30+ top crypto funds 🎨 Industry Leading Visuals & Videos 🌐 Access to 1,000+ Top Projects – AI, DeFi, Gaming, DEXs, RWA & more 🔥 Tier 1 KOL & Ambassador Network – 2,000+ engaged promoters ✍️ SEO Blog & Content Writing 📈 Recent Case Studies: Token Metrics - $8.5M raised | $100M+ FDV post-TGE - 260K+ active users | 500K+ community - $300K+ newsletter/blog revenue - Partnerships with Coinbase, Polygon, Chainlink EOS Network (Vaulta) - TVL growth: $108M → $384M - Led full GTM pivot to Web3 banking - Brought $EOS back to Top 50 by market cap 💬 What Clients Say: “If there were a token linked to Tafcir's life & career journey, I’d invest.” — Jack Milton, CEO @ Growthy™ “Tafcir delivers results. Period.” — Damir Horvat, CEO @ X8C 🎯 I Don’t Work for KPIs. I Work for Results. If you’re looking to: Launch a token Grow your community Raise capital Hit your quarterly goals …Let’s make it happen. 📩 Message me or invite me to your job post to get started.

Blockchain Linker is a technology-focused company providing advanced blockchain solutions and services for businesses across multiple industries. We specialize in end-to-end blockchain development, including smart contracts, decentralized applications (dApps), blockchain integration, tokenization, and expert consulting. With a strong focus on innovation, security, and scalability, we help clients enhance transparency, operational efficiency, and trust in their digital transactions. Our solutions are tailored to meet the unique needs of enterprises, startups, and government sectors. From private blockchain networks to integration with public blockchains like Ethereum, Solana, and Hyperledger, Blockchain Linker delivers secure and scalable platforms for digital asset management and decentralized ecosystems. Backed by a team of skilled engineers and blockchain experts, we are committed to driving blockchain adoption and building future-ready digital infrastructure.

- 𝟕+ 𝐲𝐞𝐚𝐫𝐬 of Web3 development experience - 𝟏𝟓𝟎+ 𝐩𝐫𝐨𝐣𝐞𝐜𝐭𝐬 completed including 20+ major builds - Delivered $𝟐𝟓𝐌+ worth of blockchain solutions across multiple networks 𝐖𝐡𝐚𝐭 𝐈 𝐃𝐨 𝟏. 𝐒𝐦𝐚𝐫𝐭 𝐂𝐨𝐧𝐭𝐫𝐚𝐜𝐭𝐬 Develop secure contracts for ERC-20, ERC-721, and ERC-1155 Create contracts for presales, launchpads, vesting, and airdrops Customize contracts for specific project needs 𝟐. 𝐂𝐫𝐲𝐩𝐭𝐨 𝐖𝐚𝐥𝐥𝐞𝐭𝐬 Build multi-chain wallets (custodial & non-custodial) Add features like transaction history and secure key storage Design simple and user-friendly wallet interfaces 𝟑. 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩𝐬 Build cross-platform apps using React Native Connect apps with blockchain for smooth dApp interactions 𝟒. 𝐃𝐞𝐜𝐞𝐧𝐭𝐫𝐚𝐥𝐢𝐳𝐞𝐝 𝐄𝐱𝐜𝐡𝐚𝐧𝐠𝐞𝐬 (𝐃𝐄𝐗𝐬) Create platforms for token swaps and liquidity pools Add order-matching and advanced trading features 𝟓. 𝐍𝐅𝐓 𝐏𝐫𝐨𝐣𝐞𝐜𝐭𝐬 Launch generative NFT collections with dynamic metadata Build NFT marketplaces, staking, and breeding systems Connect NFTs with wallets and IPFS storage 𝟔. 𝐌𝐞𝐦𝐞 𝐂𝐨𝐢𝐧𝐬 Develop and launch meme coins with custom features Provide tokenomics setup and tools for community engagement 𝟕. 𝐃𝐞𝐅𝐢 𝐏𝐫𝐨𝐣𝐞𝐜𝐭𝐬 Build lending, borrowing, staking, farming, and lottery platforms Create custom DeFi solutions for yield optimization 𝟖. 𝐓𝐞𝐥𝐞𝐠𝐫𝐚𝐦 𝐁𝐨𝐭𝐬 & 𝐌𝐢𝐧𝐢 𝐀𝐩𝐩𝐬 Build Telegram trading bots with automated strategies Create mini apps for portfolio tracking, alerts, and transactions Develop automation tools for community management 𝟗. 𝐀𝐝𝐝𝐢𝐭𝐢𝐨𝐧𝐚𝐥 𝐒𝐞𝐫𝐯𝐢𝐜𝐞𝐬 Zero-knowledge proofs for privacy-focused projects RESTful APIs and GraphQL integrations Custom trading bots, DNS setup, deployment, and maintenance 𝐌𝐲 𝐓𝐞𝐜𝐡 𝐒𝐭𝐚𝐜𝐤 𝐁𝐥𝐨𝐜𝐤𝐜𝐡𝐚𝐢𝐧 & 𝐒𝐦𝐚𝐫𝐭 𝐂𝐨𝐧𝐭𝐫𝐚𝐜𝐭𝐬: Solidity, Ether.js, Web3.js, Hardhat, Truffle 𝐅𝐮𝐥𝐥-𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: MERN (React.js, Node.js, Express, MongoDB), Next.js, TypeScript 𝐌𝐨𝐛𝐢𝐥𝐞 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: React Native 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: React.js, Next.js, Angular.js, Vue.js 𝐎𝐭𝐡𝐞𝐫 𝐓𝐨𝐨𝐥𝐬: IPFS, Git, Docker, RESTful APIs, GraphQL 𝐂𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬: AWS, Microsoft Azure I focus on delivering simple, secure, and scalable blockchain solutions that work across multiple networks. Whether you’re planning to launch a DeFi app, NFT project, or a new crypto wallet I can help you turn your idea into reality.

I’m a full-stack developer with experience as an SDE and SDE Intern at PlanetX, specializing in building scalable and innovative web and mobile solutions. Whether you need a robust backend, a dynamic frontend, or a complete React Native app, I can help bring your ideas to life efficiently. - Proficient in Vercel and AWS EC2 for deployment, Express for backend, and Redux.js for state management - Skilled in Nextjs, Express, React Native app development and DevOps engineering for seamless, high-performance systems - Full project lifecycle handling from ideation to deployment - Strong focus on collaboration and timely updates—let’s stay connected to ensure your project succeeds.

I build production-grade blockchain systems — not prototypes. Over 5 years I've shipped Layer-1 blockchains from scratch, DeFi platforms, NFT marketplaces, institutional payment infrastructure, and enterprise cloud deployments that run at scale. What I deliver: Smart Contracts (Solidity): ERC-20/ERC-721 tokens, staking/vesting, ICOs, DeFi trading, Chainlink oracle integrations — built with Hardhat, Truffle, and OpenZeppelin. Layer-1 Blockchain Development: Engineered two production Layer-1 networks using Cosmos SDK and Ethermint with custom Golang tokenomics modules, IBC cross-chain protocol, and sub-3-second block finality. Solana / Rust: SPL token development, on-chain program architecture, PDA management. Hyperledger Fabric: Enterprise chaincode development, MSP configuration, supply chain and permissioned DLT deployments. Institutional Financial Systems: Cross-border payment infrastructure across 3 countries with Fireblocks MPC custody and AML/KYC-compliant data flows, under 2-second settlement. Cloud and DevOps: AWS (EKS, EC2, IAM), Kubernetes, Docker, CI/CD pipelines — I can take a contract from architecture through to monitored production deployment. Tech I work with daily: Node.js, TypeScript, Golang, Solidity, Rust, Web3.js, Ethers.js, PostgreSQL, MongoDB, AWS, Hardhat. I have led engineering teams of up to 5, delivered on tight deadlines, and communicated clearly with both technical leads and non-technical stakeholders. If you need someone who can own the work end-to-end — architecture, code, testing, and deployment — let's talk.