Launching a blockchain product is more than deploying a smart contract. Whether you're creating a token, building a wallet, launching an NFT collection, or developing a Web3 platform, every component needs to be secure, scalable, and designed for long-term growth. Poor contract architecture, weak wallet integration, or overlooked security risks can lead to costly issues after launch. Building blockchain products that users can trust is what I do. I'm a senior blockchain and crypto developer with 9+ years of experience delivering production-ready solutions across Solana, Ethereum, BNB Chain, Polygon, Base, and other EVM ecosystems. I help startups, founders, and businesses transform blockchain ideas into secure, user-friendly products from smart contracts and token launches to NFT platforms, wallets, and complete decentralized applications. Over the years, I've contributed to blockchain platforms serving millions of users, processing high-value on-chain transactions, and supporting scalable Web3 ecosystems with security and reliability at their core. Some of the blockchain products I've worked on : Token Launch & Ecosystem Development – Built fungible tokens with advanced tokenomics, vesting mechanisms, staking, governance, liquidity integration, and treasury management, ensuring secure and efficient token launches across multiple blockchain networks. NFT Marketplace & Digital Assets Platform – Developed NFT minting platforms, marketplaces, royalty systems, metadata management, and compressed NFT solutions, enabling creators and businesses to launch scalable digital asset ecosystems. Multi-Chain Wallet & Web3 Applications – Engineered secure wallet integrations supporting transaction signing, token transfers, NFT management, staking, and seamless interaction with decentralized applications while delivering intuitive user experiences. My technical stack includes Rust, Solidity, Anchor Framework, Solana Program Library (SPL), Token-2022, Metaplex, Ethereum, Solana, Polygon, Base, BNB Chain, Ethers.js, Solana Web3.js, Web3.py, Node.js, TypeScript, React, Next.js, PostgreSQL, MongoDB, Docker, Kubernetes, AWS, GCP, REST APIs, GraphQL, CI/CD, and comprehensive testing across development and production environments. I believe great blockchain products combine strong engineering with clear communication. Every feature is built with security, maintainability, and performance in mind, backed by thorough testing and clean documentation. I keep clients informed throughout development, explain technical decisions in straightforward language, and deliver solutions that are ready for production not just demos. If you're planning a token launch, NFT platform, crypto wallet, Web3 application, DAO, staking platform, or any blockchain-based product, I'd be happy to discuss your vision. Share your idea or existing project, and I'll provide an honest assessment, recommend the right technical approach, and help you build a secure, scalable solution that lasts.

Hi, I am a software developer with deep experience in compiled languages, primarily Rust, Java, and Kotlin, with a strong focus on systems that require big data processing, real-time data pipelines, and low-latency execution. I design and build distributed backends deployed across cloud platforms such as AWS, GCP, and self-hosted infrastructure. My primary expertise lies in the FinTech, IoT, and eCommerce domains, with a growing focus on high-performance trading infrastructure built in Rust. I remain open to exploring and contributing to other industries that demand innovative, data-driven applications. 📈 Funding Rate Arbitrage System (Recent) Currently building a low-latency cryptocurrency funding rate arbitrage system that operates across multiple centralized and decentralized venues. Originally prototyped in Java and Kotlin, the system has been completely rewritten in Rust to meet stricter latency and reliability requirements. Technologies used: 🔹 Rust at the core for execution-critical paths, including order routing, position reconciliation, and venue connectors where tight latency budgets and predictable performance matter most 🔹 Native integrations with Binance, Bybit, Hyperliquid, and Kraken, covering both perpetual futures and spot legs 🔹 Real-time funding rate aggregation, slippage modeling, fee accounting, and risk management to identify and capture cross-venue spreads ⚡ IoT Platform I have worked on a distributed IoT platform in AWS IoT with numerous integrations and a complex architecture. Transitioned the platform from Telit to AWS IoT Core. Technologies used: 🔹 Java Spring Boot with AWS ECS to develop a scalable message-processing microservices pipeline 🔹 Dagger 2 with AWS Lambda for efficient dependency injection in serverless applications 🔹 Node.js (TypeScript) with AWS Lambda functions to implement specific integrations and enhance functionality 🚀 FinTech Trading System Developed a robust, scalable trading system capable of handling dozens of symbols across multiple accounts and brokerages. Technologies used: 🔹 The trading system is being developed using Java and Kotlin within a Spring Boot microservices architecture 🔹 Apache Kafka integrated to support the backtesting of extensive datasets 🔹 To complement the backend functionality, I developed a simple UI using React and Redux, enabling users to interact with the system 🔹 Additionally, I researched and implemented a separate module written in Python, leveraging Deep Reinforcement Learning (DRL) techniques to explore advanced analytical capabilities 🔹 Integrations with OpenAI, Binance, Metatrader (via MetaApi), and Snapi news API (Crypto, Forex, Stocks) further enriched the system’s versatility and scope 🔹 For CI/CD processes, I utilized GitLab and Docker Compose with a Cloud Native Buildpacks (CNB) approach to streamline deployments and ensure efficient workflows 🛍️ E-commerce Worked as a full-stack developer on various e-commerce projects, utilizing a wide variety of technologies and frameworks such as Java, SAP Commerce Cloud (Hybris), Spring, Apache Kafka, Hibernate, Hazelcast, Apache Solr, Kubernetes, React, and others.

I help startups, founders, and businesses to build production-ready Blockchain, Web3, and AI-powered solutions that are secure, scalable, and built for real-world use. As a Blockchain Developer and AI Agent Developer, I specialize in Smart Contract Development, Solana Development, Ethereum Development, Web3 Infrastructure, Autonomous AI Agents, and On-Chain Payment Systems. My focus is on building high-performance decentralized applications, blockchain ecosystems, and AI-driven automation that deliver measurable results. 𝗖𝗼𝗿𝗲 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲: Blockchain Development, Web3 Development, Smart Contract Development, Solidity Development, Rust Development, Solana Development, Ethereum Development, DApp Development, AI Agent Development, Agentic AI Systems, Autonomous AI Agents, Web3 Infrastructure, Layer-1 Blockchain Development, DeFi Development, NFT Marketplace Development, Cryptocurrency Payment Systems, On-Chain Payment Infrastructure, x402 Payment Protocol, Staking Platforms, Validator Nodes, Consensus Mechanisms, Hyperledger Development, IPFS Integration, Web3 Automation, Decentralized Identity Solutions, Certificate Verification Systems 𝗧𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹 𝗦𝘁𝗮𝗰𝗸: Solidity, Rust, Python, JavaScript, TypeScript, React.js, Next.js, Node.js, Web3.js, Ethers.js, Hyperledger, IPFS, MongoDB, PostgreSQL, AI/ML Frameworks, LLM Integration, Agentic AI Frameworks, API Development, Cloud Infrastructure, Blockchain Architecture, and Web3 Technologies. 𝗣𝗿𝗼𝗷𝗲𝗰𝘁𝘀 𝗜'𝘃𝗲 𝗕𝘂𝗶𝗹𝘁: ✅ Smart Contracts for Ethereum and EVM Chains ✅ Solana-Based Blockchain Applications ✅ NFT Marketplaces with Minting, Trading, and Marketplace Features ✅ DeFi Protocols and Staking Platforms ✅ Layer-1 Blockchain Ecosystems with Validator Networks ✅ Decentralized Verification and Credential Systems ✅ AI-Powered Autonomous Agents ✅ On-Chain Payment Infrastructure and Web3 Payment Systems ✅ Enterprise Blockchain Solutions using Hyperledger ✅ Web3 Automation and Blockchain Integrations Whether you're building a Blockchain Startup, Web3 Platform, DeFi Protocol, NFT Marketplace, AI Agent, Smart Contract System, or Cryptocurrency Payment Solution, I can transform your idea into a secure, scalable, and production-ready product. Let's build the future of Blockchain, Web3, Smart Contracts, AI Agents, DeFi, NFTs, and Decentralized Infrastructure.

🚀 Need a developer who can actually deliver, communicate clearly, and build software that scales? I'm Syed Ahmad, a Senior Full Stack & Blockchain Developer with 10+ years of experience helping startups, founders, and businesses turn ideas into production-ready products. Many clients come to me after dealing with missed deadlines, poor code quality, unreliable developers, or projects that became impossible to maintain. My goal is simple: build clean, scalable software, keep communication transparent, and help you launch successfully. What I Specialize In Full Stack Development React.js Next.js Node.js TypeScript Express.js Angular MongoDB PostgreSQL MySQL REST APIs GraphQL SaaS Platforms Custom Web Applications From startup MVPs to large-scale business platforms, I build applications that are fast, secure, and built for growth. Blockchain & Web3 Development Smart Contracts Solidity NFT Marketplaces NFT Minting & Staking Platforms DeFi Applications DApps Token Development Wallet Integrations Ethereum Polygon Solana Web3.js Ethers.js Whether you're launching a Web3 startup, NFT platform, staking system, or blockchain-powered application, I can help build the entire ecosystem from frontend to smart contracts. Payment & Subscription Systems Stripe Stripe Connect PayPal Subscription Billing Marketplace Payments Custom Payment Flows Industries I've Worked With Blockchain & Crypto SaaS Platforms FinTech Healthcare E-commerce Marketplaces Property Management Logistics & Supply Chain LegalTech Why Clients Work With Me ✅ 10+ Years of Professional Experience ✅ Clean, Scalable, Maintainable Code ✅ Strong Communication & Regular Updates ✅ Fast Problem Solving & Reliable Delivery ✅ Experience Taking Products from MVP to Launch ✅ Long-Term Partnership Mindset I don't just write code. I help businesses make smart technical decisions, avoid costly mistakes, and build products that are ready for real users. If you're looking for a developer who can take ownership, understand your goals, and turn ideas into successful products, I'd love to discuss your project. Let's build something great together.

I am a full-stack blockchain developer working across smart contracts and dApps with over 4 years of hands-on experience. I have worked with 40+ clients, helping turn Web3 ideas into secure, scalable, and production-ready products. My experience spans both EVM-based chains and Solana, where I have delivered DeFi platforms, NFT marketplaces, token ecosystems, and smart-contract-driven automation. I focus on solid contract architecture, security best practices, and efficient execution, while making sure everything integrates smoothly with backend services and modern user interfaces. I work across the full development lifecycle from smart contract design and testing to deployment and frontend integration. Whether it’s launching a new protocol, building an NFT platform, or integrating blockchain features into an existing product, I aim for solutions that are practical, maintainable, and ready to scale. 🛠️ What I Work On I build end-to-end blockchain systems, covering both on-chain logic and off-chain infrastructure. - Smart contract development using Solidity and Rust - Full dApp development with React and Next.js - NFT minting systems and custom marketplaces - DeFi platforms and protocol-level features - Blockchain backend APIs with Node.js, Express, and NestJS - Token creation and standards (ERC-20, ERC-721, ERC-1155) - Smart contract testing and deployment workflows - Blockchain data indexing, automation, and integrations 🔗 Blockchains & Integrations I actively work across multiple ecosystems, selecting tools based on performance and use case. - All major EVM-compatible chains - Solana using Anchor and Rust - IPFS for decentralized storage - Chainlink and cross-chain integrations 📦 Development Stack A production-focused stack built for reliability and long-term maintenance. - Languages: JavaScript, TypeScript, Solidity, Rust, Python - Frontend: React, Next.js - Backend: Node.js, Express, NestJS - Smart Contract Tooling: Hardhat, Remix - Web3 Libraries: Web3.js, Ethers.js, Wagmi - Web3 Platforms: Thirdweb, Moralis - Solana Tooling: Anchor Framework If you are looking for a blockchain developer who values clear communication, clean execution, and long-term stability, I’d be happy to connect. Let’s discuss your project and see how we can move it forward.

"One of the best services I got in the past 20 years. Super professional and knowledgeable. Much experience. Remarkable communication skills. Attentive immediately when I needed to. Solved 100% of my problems and gave me ideas for new directions. My business is growing thanks to him. Thank you, Jure" That is a real client. Here is what sits behind it. I lead SenLab, a multi awards winning IoT team from Slovenia, EU. I am the consultant you talk to; the team behind me does the building. We do two things well. DEVICES AND FIRMWARE. Microcontroller boards and embedded firmware that survive the field: Nordic nRF (nRF Connect SDK, Zephyr), ESP32, STM32 class MCUs, firmware in C and Rust, custom PCBs, wearables and biosensors (IMU, ECG, GPS, environmental), asset trackers, industrial controllers and gateways. Radio: BLE and BLE Mesh, LoRaWAN, NB-IoT, WiFi, 4G and 5G, Meshtastic. We have 250,000+ devices deployed in the field, updated over the air, pushing 50M+ MQTT events a day on our own IoT operating system. Delivered client work includes custom Android (AOSP), backend and FOTA for a 4G kids smartwatch that became a top seller on Amazon, and firmware for a research grade velocity based training sensor, raw IMU into numbers athletes trust. DATA AND CONTEXT PLATFORMS. When your data is stuck in silos and every integration breaks on the next update, we unify it on the ETSI NGSI-LD open standard, so you own your data and keep an exit from any vendor. We run our own managed context data platform, our own IoT Linux distribution with 130+ preinstalled packages (FIWARE Orion, Scorpio, Node-RED, EMQX MQTT, Kafka, PostgreSQL, Grafana, ThingsBoard, OPC-UA, Sparkplug B, Modbus), a data mapper, Unified Namespace, digital twins and dashboards. On premises or private cloud when data sovereignty matters. Deployed in hours, not months (VelaContext, SandBoxOS or IoTool are our products). HOW I WORK. I will tell you when your idea will not work, and what to do instead. A premade certified radio module before a custom RF board. No custom PCB for version one when a dev kit gets you to market faster. No single Arduino loop in industrial production. That advice sometimes costs me the job. The clients who stay are the ones I want. My motto: "Fail fast without big consequences, learn something, repeat, succeed!" Not sure yet if your device, sensor or platform idea is doable? Start with a one hour consulting call. You leave with a straight answer, the risks, and the cheapest safe first step. Domains: Industry 4.0 and IIoT, smart city, logistics, eHealth, telehealth and AAL, smart home, research. Partner in several EU funded R&D projects (Horizon 2020), Eurostars Eureka IoT evaluator. GDPR and HIPAA aware. Sometimes, I wasn't smart enough to know that I couldn't do it, so I did it. 😊

■ I 'am a seasoned software engineer with more than 25 years of experience in developing great software & bringing to life awesome apps ■ I will take ownership of your project & bring it to fruition quickly & without burning a hole in your pocket ■ I have built several micro-services & REST-based services & applications ■ I have built desktop apps, web apps, & mobile apps for Fortune-500 companies as both an independent contractor & as part of large software development teams ■ I have experience in setting up & migrating apps & services on to the Cloud - be it AWS, Azure, or GCP ■ C, C++, GoLang, Java, Python, Javascript, Typescript, React, Vue, Flutter, Jenkins, Groovy, Docker, Kubernetes, SQL, Postgres, Informix, Oracle, SQL Server, Elastic-Search, Elastalerts, Grafana, Istio, Kiali, JUnit, Selenium, JMeter, K6.

I build AI that does real work: agents that automate your workflows, chatbots that answer from your docs and data, and AI features inside your product. I bring engineering rigor from a YC W25 AI lab (AfterQuery), where I assessed 800+ agent tasks used to benchmark frontier models. Most AI features break on the edge cases nobody tested. I know where they break, so I ship systems that hold up in production, not just in the demo. What I can do for you: - Automate workflows: AI agents that handle repetitive processes end to end (research, triage, data entry, reporting) - Answer from your data: chatbots and copilots grounded in your docs, helpdesk, or database (RAG) - Add AI to your product: LLM features, API integrations, multi-agent backends with tool use and guardrails - Build the production backend underneath: Python, TypeScript/Node, PostgreSQL Selected work: - Gatekeep: a multi-agent system that reviews GitHub changes and blocks low-quality AI output before merge - AfterQuery (YC W25): evaluated 800+ software-engineering tasks across 6 languages for frontier-model benchmarking - Production agent and RAG systems built on LangChain/LangGraph, OpenAI, and Claude Tell me what you want to automate or build, and I will tell you straight whether I am the right fit.

Hello! I am expert Backend Developer with almost 20 years of experience in backend, Android mobile, desktop apps, apps for embedded devices, ERP apps and web development. Proficient in developing applications in wide range of areas, including business applications and database management. Have high attitude expertise in Linux OS management, including building automated servers with set of services/tools for different purposes, virtualization tehcnologies like KVM/libvirt, containerization technologies like LXC, Docker, Kubernetes. What I can do: - Planning and implementing the app’s architecture and features. - Writing apps from the very scratch and further support. - Code Review, Fixing and supporting the apps written by others. - Working with a team of developers or solo. Technical Skills: * Languages and Frameworks: Java (Spring, Quarkus, Dropwizard....), Kotlin, C, C++, Qt, Rust, Go, Python (Django), JavaScript, PHP * Platforms: Backend, Android, Linux (Fedora, RedHat, CentOS, Ubuntu) * Technologies: Docker, Kubernetes, CI/CD, Mobile Development, Docker, KVM, libvirt, IT infrastructure monitoring tools, AWS services, GCP * Database Management: PostgreSQL, SQLite, MySQL.... - I'm open to working with big and small companies and individual clients. - I'm comfortable signing an NDA. - Prefer long-term collaboration. - Ready to work 30-60 hours per week I'm open to various projects and would love to show you my creative side too. My commitment to continuous learning keeps me updated with the latest trends and technologies, allowing me to bring cutting-edge solutions to your projects and better expreince. I am giving high attention to details, ready to resolve complicated and complex challenges, always tend to offer most efficient solution. Thanks for your time Regards Rafael S.

I have expertise in Blockchain, Web and Mobile Applications, AI, SaaS, and custom solutions. We deliver scalable and secure products with Full Stack Development (MERN, React, Node.js, Vue), Mobile Applications (React Native, Flutter), Web3, Smart Contracts, and AI Platforms. We provide technical, industrial and result oriented development of products which scale and perform, taking example of one of our projects, a coffee shop based in Mexico which is generating revenue through a Custom Menu App which is developed by us and they are raising money through a Fundraising Platform built by our team, they have successfully raised 500k+ USD proving the scalability and business model. WHAT WE OFFER Blockchain and Web3: We offer Blockchain Development and Smart Contracts ( ERC1155 / ERC721 / ERC20 ), Marketplaces, and NFT Platforms. We have our expertise in ICO and Token Launches, dApps, and Wallet Integration. Web and Mobile Application Development: SaaS platforms and customized apps, including Mobile Apps (iOS and Android) and Web Applications, are what we are experts in. Moreover, we make admin dashboards and different portals as well. AI, ML & Generative AI: AI Applications, Chatbots, AI search, Vector databases, Semantic search, ChatGPT integration and Open AI are some technologies we work on. Furthermore, we provide fine Prompt Engineering and LLM solutions. UI/UX & Video Production: We provide Prototyping, UI/UX, Product and Explainer videos to help you grow. Support & Maintenance: We offer ongoing technical support, performance monitoring, security updates, bug fixes, and system optimization to ensure long-term stability and scalability of your digital products. Technology Stack Frontend: React.js, Next.js, Redux, Vue.js, Vuex, Nuxt.js, Tailwind CSS, Bootstrap, GatsbyJS Backend: Node.js, Express, NestJS, Sails, Python, Django, Flask, PHP, Laravel, Ruby on Rails Mobile: React Native, Flutter, Swift, iOS, Android. AI & ML: Generative AI, LLM, LangChain, Cohere, Vector Databases, Semantic Search Cloud & DevOps: AWS (EC2, S3, Lambda, DynamoDB, MWS), Firebase, Google Filestore, Docker, Kubernetes. Database: MySQL, PostgreSQL, MongoDB, Firebase. Integrations: Stripe, Google Maps, Mapbox. CMS & eCommerce: WordPress, Shopify, WooCommerce, Webflow. Why Clients Choose Us: Clients choose because they look for the founder's involvement & agile approach including daily and weekly project updates and clarity. We offer unlimited design revisions and free post launch support for 2 months. We provide custom, scalable and SEO friendly solutions. We work across different time zones with devoted project managers and QAs. Serving diverse industries: EdTech, FinTech, Healthcare, Travel, Sports, Entertainment, Fashion, Food & Beverages, and more Global collaboration: working across time zones with dedicated project management and QA We don’t just make applications, we build solutions that impact, perform, and enhance business potential. LAST UPDATED: 2/20/2026 #WebDevelopment #FullStackDevelopment #SoftwareDevelopment #CustomSoftware #ProductDevelopment #EnterpriseSoftware #SystemArchitecture #LegacyMigration #ApplicationDevelopment #MERN #JavaScriptStack #ModernWebStack #T3Stack #ServerlessStack #VercelStack #JavaScript #TypeScript #PHP #Python #GoLang #Rust #CPlusPlus #SQL #React #NextJS #VueJS #Angular #FrontendDevelopment #UIUXDesign #ResponsiveDesign #TailwindCSS #Redux #Zustand #FramerMotion #ShadcnUI #NodeJS #NestJS #Laravel #BackendDevelopment #APIDevelopment #GraphQL #Microservices #ExpressJS #Django #FastAPI #StripeIntegration #MongoDB #MySQL #Redis #Firebase #Supabase #NoSQL #AWS #GoogleCloud #CloudNative #DevOps #CI/CD #GitHubActions #Kubernetes #Vercel #AppDevelopment #MobileAppDevelopment #CrossPlatform #HybridApps #MobileSolutions #PWAs #Flutter #SwiftUI #Kotlin #Dart #Firebase #Supabase #APIDevelopment #BackendDevelopment #CI/CD #AWS #GoogleCloud #DevOps #Shorebird #Web3 #BlockchainDevelopment #BlockchainDevelopment #BlockchainDevelopment #SmartContracts #DAppDevelopment #DeFi #NFTDevelopment #CryptoWallet #DEX #DAO #Ethereum #Solidity #SolidityDeveloper #Hardhat #EthersJS #Anchor #Wasm #GenerativeAI #LLMIntegration #OpenAI #LangChain #AIAgents