Freelance Blockchain Developers in KarachiFreelance Blockchain Developers in Karachi
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Muhammad Asif's avatar
Muhammad Asif
Karachi, Pakistan
Full Stack Blockchain Developer
New to Contra
Full Stack Blockchain Developer
Cover image for Built an AI-powered smart contract
Built an AI-powered smart contract security analysis platform that detects critical vulnerabilities in Solidity, Rust, Move, and Vyper smart contracts in under 60 seconds. The system uses a multi-stage AI pipeline to identify reentrancy attacks, access control issues, integer overflow vulnerabilities, front-running risks, and gas inefficiencies — returning a severity-ranked security report with actionable fix recommendations. The platform features a three-tier help system: self-service educational fix guides with real code snippets, AI-generated fix suggestions for Pro users, and an emergency agency fix pathway connecting critical vulnerability discoveries directly to senior blockchain engineers. Built on Next.js 15, Neon PostgreSQL, Drizzle ORM, Clerk authentication, and Upstash Redis for rate limiting. Includes a full user dashboard with smart contract auto-naming, version tracking, audit history, and side-by-side comparison of multiple audit runs — enabling developers to track security improvements over time.
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Cover image for Built a full-stack ISP Management
Built a full-stack ISP Management and Billing System from the ground up — a multi-role SaaS-ready CRM designed for internet service providers managing dealers, customers, and network infrastructure at scale. Core features include a real-time dealer credit ledger with hard-reject logic, automated nightly customer suspension tied to package expiry, PPPoE credential generation on activation, and PDF invoice generation on every transaction. The system is architected with a shared PostgreSQL database serving both the application layer and FreeRADIUS — meaning network-level actions like customer suspension and bandwidth enforcement flow directly from CRM operations without any manual intervention.
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Cover image for I built AI Powered Automated
I built AI Powered Automated Social Media Management Tool.
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Cover image for Developed a SaaS product of
Developed a SaaS product of AI Automated Social Media Management Tool .
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Blockchain Developer(2)
Hamza Fahim's avatar
Hamza Fahim
Karachi, Pakistan
Creative WEB3 Artist | Visualizer | UI Designer
New to Contra
Creative WEB3 Artist | Visualizer | UI Designer
Cover image for KittyKoin-
KittyKoin-
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Cover image for Keer — Crypto & Stablecoin Payment Pitch Deck
Keer — Crypto & Stablecoin Payment Pitch Deck
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Cover image for MØD Coffee - Matcha Brand Identity & Packaging
MØD Coffee - Matcha Brand Identity & Packaging
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Cover image for Web3 UI/UX, branding, and product
Web3 UI/UX, branding, and product design built for real-world products. ORDER is one example of how I turn complex crypto platforms into clear, premium, and usable digital experiences. My work covers the complete visual journey from brand direction and product storytelling to dashboards, trading interfaces, design systems, and high-end campaign visuals. I help Web3, fintech, crypto, and AI brands create products that feel credible, differentiated, and ready for the market. Available for: • Web3 and fintech UI/UX design • Crypto dashboard and trading platform design • Brand identity and visual systems • Pitch decks and product presentations • Creative direction and campaign visuals Building a Web3 or fintech product? Let’s create something people trust, understand, and remember. Full ORDER case study (https://www.behance.net/gallery/249388707/Orderflow-Crypto-Trading-UIUX-Branding)
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Blockchain Developer(3)
Nawaz Ur Rehman's avatar
Nawaz Ur Rehman
Karachi, Pakistan
Fullstack Engineer | Web3, Blockchain & AI Developer
New to Contra
Fullstack Engineer | Web3, Blockchain & AI Developer
Cover image for At BlockSynk Technology, we design
At BlockSynk Technology, we design and develop enterprise-grade cryptocurrency exchange platforms — end-to-end, from smart contracts to polished mobile & web interfaces. This project showcases our capability to build platforms similar to Bitrue — a complete crypto ecosystem covering spot trading, futures, staking, copy trading, DeFi lending, and token launchpads. ────────────────────────────── 🔷 WHAT WE BUILD ────────────────────────────── 💱 Spot & Futures Trading Engine High-performance trading interfaces with real-time order books, candlestick charts, market/limit/stop orders, and USDT, COIN-M & USDC-margined futures — all powered by WebSocket for zero-lag execution. 📊 Copy Trading System Social trading infrastructure where users can follow top traders, automatically mirror positions, and share in profits — with full performance dashboards and risk controls. 🏦 DeFi Earn & Staking Flexible staking pools, Power Piggy-style yield products, BTR lockup mechanisms, and auto-invest bots delivering competitive APR across multiple tokens. 💳 Crypto Loans Crypto-backed lending system where users pledge collateral (BTC, ETH, XRP) to borrow stablecoins — with liquidation engines, interest calculation, and real-time LTV monitoring. 🚀 Token Launchpad IDO/IEO launchpad for new token listings with whitelist management, vesting schedules, distribution contracts, and fair launch mechanics. 🖼 NFT & Alpha Trading Integrated NFT marketplace and Alpha trading interface giving users direct Web3 access from within the exchange — wallet connect, minting, and secondary market trading. 🤖 AI-Powered Analytics Machine learning models for price prediction, sentiment analysis, smart portfolio rebalancing suggestions, and AI-driven copy trading performance scoring. 📱 Mobile App (iOS & Android) Full-featured React Native mobile app with biometric login, real-time push notifications, portfolio tracking, one-tap trading, and seamless wallet integration. ────────────────────────────── ⚙️ TECH STACK ────────────────────────────── Frontend: React.js / Next.js, React Native (Mobile), Flutter Backend: Node.js, Python, FastAPI, WebSocket, Redis Blockchain: Solidity, Ethers.js, Web3.js, Hardhat, EVM Chains Database: PostgreSQL, MongoDB, Redis (caching) AI/ML: Python, TensorFlow, OpenAI API, LangChain Infrastructure: AWS, Docker, Kubernetes, CI/CD, Nginx Security: JWT, 2FA, biometric auth, smart contract audits ────────────────────────────── 💰 SERVICES & PRICING ────────────────────────────── ✅ Full Exchange Platform Build → Custom Quote (from $15,000) ✅ Trading Engine Only → From $5,000 ✅ Smart Contracts & DeFi → From $3,000 ✅ Mobile App (iOS + Android) → From $3,000 ✅ AI Integration & Analytics → From $2,000 ✅ Individual Features/Modules → $25–$50/hr ────────────────────────────── 📬 CONTACT ────────────────────────────── 👤 Nawaz Ur Rehman 🏢 BlockSynk Technology 💼 Available for full builds, modules, or ongoing development 📩 Open to discuss your project scope today
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Cover image for Enterprise AI Agent & Workflow
Enterprise AI Agent & Workflow Automation Platform Overview Designed and developed an AI-powered automation platform that helps businesses streamline operations through intelligent agents, workflow automation, and AI-driven decision-making. The solution enables teams to automate repetitive tasks, process large volumes of data, retrieve knowledge from documents, and integrate AI directly into business workflows. What I Built Custom AI agents powered by OpenAI and LLM technologies Workflow automation systems for business operations RAG (Retrieval-Augmented Generation) pipelines Document intelligence and knowledge retrieval AI-powered reporting and data processing API integrations with third-party business tools Agent monitoring and execution dashboards Scalable backend architecture for AI services Key Features ✓ Autonomous AI Agents ✓ Business Process Automation ✓ Document Q&A Systems ✓ Knowledge Base Search ✓ Multi-Step Workflow Execution ✓ Vector Database Integration ✓ Analytics & Monitoring ✓ Secure API Integrations Technologies Used OpenAI, LangChain, Python, FastAPI, Pinecone, ChromaDB, PostgreSQL, React.js, Next.js, TypeScript, REST APIs Results Reduced manual workload through automation Improved operational efficiency Faster access to business knowledge Streamlined internal workflows Enhanced decision-making with AI-powered insights Services Demonstrated AI Agent Development • RAG Systems • Workflow Automation • OpenAI Integration • Enterprise AI Solutions • Custom AI Applications Project Link https://beam.ai/
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Cover image for Realtor.com (http://Realtor.com) – Real Estate
Realtor.com (http://Realtor.com) – Real Estate Marketplace Platform Overview Realtor.com (http://Realtor.com) is one of the largest online real estate marketplaces, helping millions of users search for homes, apartments, rentals, and real estate services across the United States. The platform provides property listings, market insights, mortgage tools, and agent connections for buyers, sellers, and renters. My Role Full-Stack Developer Responsibilities • Frontend development and responsive UI implementation • Property search and filtering experiences • Real estate listing presentation • API integrations and data management • Performance optimization • Mobile responsiveness • User experience enhancements • Interactive map and location-based features Key Features ✓ Property search and discovery ✓ Advanced filtering system ✓ Interactive map search ✓ Property detail pages ✓ User authentication ✓ Saved searches and favorites ✓ Agent contact workflows ✓ Mortgage and home-buying tools ✓ Responsive web experience Challenges Solved Handling large volumes of property listings Optimizing search performance Improving property discovery workflows Creating mobile-first user experiences Delivering scalable and maintainable frontend architecture Technologies React.js • Next.js • TypeScript • JavaScript • Node.js • REST APIs • GraphQL • Google Maps API • Responsive Design Results Improved property discovery experience Faster search and filtering performance Enhanced mobile engagement Better lead generation workflows Scalable real estate platform architecture Project URL https://www.realtor.com
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Cover image for TeacherTube – Educational Video Platform Overview Contributed
TeacherTube – Educational Video Platform Overview Contributed to the development and enhancement of TeacherTube, an educational video platform that helps students, teachers, and schools discover and consume learning-focused video content across subjects such as Math, Science, History, Language Arts, and Educational Songs. My Role Full-Stack Developer Responsibilities Developed responsive user interfaces for content discovery and navigation. Improved video browsing and category-based filtering. Enhanced search functionality for educational content. Optimized platform performance and user experience. Implemented responsive layouts for desktop and mobile devices. Integrated APIs and supported content management workflows. Key Features Educational video streaming Subject-based categorization Search and filtering system User authentication Content management Responsive design Mobile-friendly experience Results Improved content discoverability Better user engagement and navigation Enhanced performance across devices Scalable and maintainable codebase Technologies React.js, JavaScript, TypeScript, Node.js, REST APIs, HTML, CSS, Responsive Design Project Link https://www.teachertube.com
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Blockchain Developer(1)
Sartaj Ahmed Soomro's avatar
Sartaj Ahmed Soomro
Karachi, Pakistan
UI/UX Designer | SaaS & Website Designer | Figma Expert
New to Contra
UI/UX Designer | SaaS & Website Designer | Figma Expert
Cover image for Web3 Blockchain UI UX Design
Web3 Blockchain UI UX Design
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Cover image for Embers of Gold — Rea Withers Coaching
Embers of Gold — Rea Withers Coaching
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Cover image for Cleaning Services Website UI Design Conversion-Focused Layout
Cleaning Services Website UI Design Conversion-Focused Layout
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Cover image for Creative Agency Landing Pages Figma Design
Creative Agency Landing Pages Figma Design
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Blockchain Developer(2)
Berg Media's avatar
Berg Media
Karachi, Pakistan
Senior Full-Stack & Blockchain Developer
Senior Full-Stack & Blockchain Developer
Cover image for OMNI NFT Marketplace
OMNI NFT Marketplace
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Cover image for Testnet Roburna Blockchain Explorer
Testnet Roburna Blockchain Explorer
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Cover image for Empire Marketplace
Empire Marketplace
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Blockchain Developer(3)
Ahmed Anis's avatar
Ahmed Anis
Karachi, Pakistan
AI Developer & Full Stack Engineer 💻🗄️💡
AI Developer & Full Stack Engineer 💻🗄️💡
Cover image for Remote Ave
Remote Ave
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Cover image for Sentinel AI - AI chatbot for cloud security
Sentinel AI - AI chatbot for cloud security
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Cover image for Authentication APIs
Authentication APIs
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Cover image for Leviosa Wellness
Leviosa Wellness
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Blockchain Developer(1)