Seasoned Backend Engineer | Golang | Node.js | Python | Solidity | Rust | Fintech | Payments | Blockchain | Smart Contracts | Microservices | Kubernetes | AWS | Payment Gateway | Ethereum | BNB Chain I am a seasoned Backend Engineer with 4+ years of hands-on experience architecting and delivering high-performance, scalable systems across fintech, payments, and blockchain domains. Specializing in Golang, Node.js, Python, Solidity, and Rust, I build robust payment gateway solutions, distributed services, and secure smart contract ecosystems for global clients. I have led end-to-end development of mission-critical products, including enterprise payment platforms, microservices architectures, event-driven systems with Kafka and NATS, and blockchain-powered automation on Ethereum and BNB Chain. Expertise includes designing scalable payment processing systems with multi-provider integrations (Stripe, PayPal, Braintree), secure transaction flows, real-time reconciliation, settlement engines, fraud detection using machine learning, and audit-ready infrastructure compliant with PCI-DSS and GDPR. Core Strengths - Payment Gateway Engineering & Fintech Solutions: Developed scalable payment processing systems handling high-volume transactions, multi-currency support, recurring billing, subscription management, and integrations with PSPs like mpgs, cyber source, and local payment gateways. Optimized for low-latency, high-availability using Docker and Kubernetes. - Blockchain Development & Smart Contracts:Architected secure smart contracts in Solidity for Ethereum and BNB Chain, including DeFi protocols, NFT marketplaces, tokenomics (ERC-20, ERC-721), recurring payments via Chainlink oracles, and hybrid backend-blockchain integrations with Web3.js and ethers.js. - Backend Architecture & Scalable Systems: Expert in clean, maintainable microservices and distributed systems using event-driven architectures (Kafka, Pulsar), serverless on AWS Lambda/GCP Cloud Functions, GraphQL APIs, and RESTful services prioritizing performance, reliability, and low latency with Redis caching and PostgreSQL sharding. - Technical Leadership & DevOps: Led cross-functional engineering teams of 5-10, established coding standards (Go best practices, PEP8), mentored juniors, guided architectural decisions with Terraform IaC, and deployed CI/CD pipelines via Jenkins and GitOps for zero-downtime releases. - Cross-Team Collaboration & Agile Delivery: Partnered with product managers, designers, and stakeholders in remote global teams to translate business requirements into technical roadmaps, using Jira, Confluence, and Scrum for on-time delivery of complex features like real-time analytics dashboards and API gateways. Technical Skill Set - Languages & Frameworks: Golang (Gin, Echo), Python (Django, Flask, FastAPI), JavaScript/Node.js (Express, NestJS), Rust (Actix, Tokio), Solidity (Hardhat, Truffle), React (for full-stack prototypes), SQL/NoSQL optimization - Cloud & DevOps: AWS (EC2, S3, RDS, ECS), GCP (Compute Engine, BigQuery), Azure (App Services), Docker, Kubernetes (EKS, GKE), Terraform, Jenkins, GitHub Actions, Prometheus/Grafana monitoring - Databases & Messaging: PostgreSQL, MySQL, MongoDB, DynamoDB, Redis (Pub/Sub, caching), Apache Kafka, Apache Pulsar, NATS streaming - Tools & Platforms: Serverless architectures, GraphQL (Apollo), REST APIs, ELK Stack (Elasticsearch, Logstash, Kibana), Webpack, JAMstack (Next.js), Web3 tools, CI/CD automation What I Bring to Your Upwork Project As a top-rated freelancer on Upwork, I deliver secure, scalable, and production-ready systems tailored to fintech startups, payment processors, and blockchain ventures. Whether you need a custom payment gateway, Solidity smart contract audit, Golang microservices migration, or full-stack backend overhaul, I focus on reliability, clean code, performance benchmarks, and measurable ROI. I thrive in fast-paced sprints, solve complex problems with data-driven approaches, and drive projects from MVP to scale let's build your next big thing! Available for hourly or fixed-price contracts.

Hi, Here is a senior blockchain developer who can build your blockchain world. My primary skills are solidity, rust, web3.js, react.js, python, C/C++. And I can provider below services for clients Smart contract development on ERC20, ERC721, ERC1155, BEP20, Solana, EOSIO, WAX, Polygon. AVAX, DeFi/ DApp & NFT minting, staking, marketplace tool development. Cross-Chain-Bridge development part using Moralis & Chainlink services or own bridge contract. ICO & IDO development & marketing. (Presale & Airdrop & Staking) Crypto Game (payment via crypto or nft game collects) Crypto bot development like NFT minting bot or transaction history checking bot. Also, I am working on flexible timezone. Therefore if anyone want quality result, please hire me. I will be here with you. Thank you so much.

Are you looking to build autonomous AI agents, multi-agent systems, or a custom GenAI application, but don't want the hassle of managing separate backend and frontend developers? I am a Full-Stack AI & Automation Engineer with a year of production experience shipping complex, scalable GenAI platforms. I specialize in building state-of-the-art multi-agent workflows using LangGraph and LangChain, integrated with high-performance NextJS and TypeScript frontends. Most developers only know how to make simple, single-turn API calls to OpenAI. I build deterministic, multi-agent state machines that can plan, reflect, utilize external tools, and execute complex business tasks autonomously. 🛠️ WHAT I CAN BUILD FOR YOU: • Autonomous AI Agent Workflows: State-of-the-art multi-agent systems using LangGraph. • Enterprise Automation & RAG: Intelligent document processing, cognitive search, and semantic data extraction pipelines using FAISS, ChromaDB, and OpenAI. • Custom AI Dashboards: High-performance React and NextJS frontends with real-time UI updates (WebSockets and SocketIO) and robust API backends (FastAPI, Flask, and NodeJS). • CRM/ERP Automations: Seamless integrations between your custom AI pipelines and third-party SaaS tools. 🚀 WHY WORK WITH ME? • Full-Stack Execution: I write clean, optimized Python backend logic and deliver the pixel-perfect TypeScript UI myself—saving you time, communication overhead, and budget. • Production Experience: Having worked with enterprise integrations at Connektra and co-founded my own software provider (Nexa Wings), I know what it takes to ship reliable, production-grade code under tight deadlines. • AI Evaluation: I use frameworks like LangSmith to monitor, evaluate, and optimize agent costs, accuracy, and response latencies. Whether you need a quick prototype built in a week or a scalable enterprise-grade multi-agent architecture, I am ready to start immediately. Click the "Invite to Job" button, and let's jump on a quick 10-minute call to discuss your system architecture!

Empower your business with seamless technology solutions tailored for the future. As a seasoned developer, I specialize in delivering cutting-edge automation and intelligent software for Web3, blockchain, and AI-driven n8n workflows. Expert in blockchain development (solidity, smart contracts, DeFi, centralized exchanges, play-to-earn games, decentralized apps) Advanced skills in Rust programming, suited for performance-critical blockchain and Web3 applications Passionate about building and deploying AI agents—ready to automate business processes, enhance efficiency, or bring innovative value to your projects I turn complex requirements into robust, scalable solutions: Automate any workflow: Save time and reduce manual effort with smart AI agents and custom automations—whether it's customer onboarding, data processing, or operational logistics Rust-powered apps: Leverage secure, high-performance applications designed for speed and reliability, perfect for blockchain, DeFi, and fintech systems Blockchain expertise: Launch, integrate, and scale your next blockchain or Web3 idea—from token development to full ecosystem solutions Let's future-proof your business! Ready to innovate, collaborate, and deliver results—no matter the size or complexity of your project. Reach out now to discuss your vision.

Hey there! I’m a full stack developer who loves building fast, scalable, and clean web applications; from sleek frontends to solid backend systems. Here’s the stack I work with most: • React & Next.js – for responsive, high-performance frontends • Node.js – fast, flexible backend development • Angular – structured, scalable frontends for complex apps • Express, MongoDB, PostgreSQL, REST & GraphQL – full backend & API support • Bonus: TypeScript, Firebase, Tailwind, and more Whether you’re starting from scratch or need help improving an existing app, I can jump in and help bring your ideas to life with clean code and great UX.

Hello! I'm a multi-disciplinary developer specializing in building intelligent, scalable, and secure digital solutions across AI/ML, Web, and Blockchain domains. With a solid foundation in software engineering and a passion for solving complex problems, I bring end-to-end product development skills—from data-driven backend systems to modern UI/UX interfaces and decentralized applications. 💡 What I Do Best: 🤖 Artificial Intelligence / Machine Learning Predictive modeling & analytics (scikit-learn, XGBoost, TensorFlow) Natural Language Processing (GPT-4, Transformers, spaCy, LangChain) AI-powered web apps (OpenAI API, fine-tuning, LLM agents) Recommendation systems, fraud detection, and chatbots 🧑‍💻 Full-Stack Web Development Frontend: React.js, Next.js, Tailwind, Framer Motion Backend: Node.js, Express, Django, FastAPI API integration, authentication (JWT/OAuth), dashboard design PostgreSQL, MongoDB, Firebase, GraphQL, REST 🔗 Blockchain & Web3 Development Smart Contracts (Solidity, Hardhat, OpenZeppelin) dApps with Web3.js / Ethers.js and MetaMask NFT platforms, staking systems, DeFi protocols IPFS, Chainlink oracles, DAO governance ✅ Why Work With Me? 🔍 Clean, scalable, and well-documented code 🧠 Strong problem-solving and algorithmic thinking ⚡ Fast turnaround & clear communication 🧪 Rigorous testing, debugging, and deployment 🎯 Committed to delivering high-quality, future-proof solutions Let's bring your project to life — intelligently, securely, and beautifully. 📩 Feel free to send me a message — I’m ready to build something amazing with you!

I build on-chain systems that predict fraud, trace assets, and run autonomously. Recent deliveries: • 99.7% accurate coffee supply-chain tracker (Polygon + TensorFlow) • DeFi risk oracle that cut liquidations 72% (live on Arbitrum) • Pharma traceability platform saving $180k in counterfeits Stack: Python, TensorFlow/PyTorch, Solidity, Hardhat, Web3.py, Chainlink, Hyperledger, LangChain Available for traceability, AI oracles, DeFi risk models, tokenomics + ML. Message me – I’ll send a 60-sec Loom of a live prototype that fits your project.

I specialize in smart contract development, leveraging over three years of experience in blockchain technology. My expertise spans DeFi, NFT infrastructure, and on-chain security, where I've successfully built production-grade smart contracts and contributed to protocol-level integrations with leading DEXes. I have developed real-time threat detection bots for major EVM chains and showcased my skills in competitive audits, achieving 25+ high and medium severity findings across multiple platforms. Notably, I secured 2nd place in the Starknet Staking Audit Competition. I focus on delivering secure, efficient, and scalable blockchain solutions. If you're searching for a proactive and detail-oriented developer to elevate your project, let's connect and discuss how I can help.

Bringing ideas to life requires not just vision but the technical prowess to implement them efficiently. If your project has reached the critical phase where a robust, scalable backend is needed or you've done all the bare-bones and you need someone to tidy it up with best practices and pure magic, you’ve found your expert. With a deep-seated proficiency in backend technologies, I specialize in crafting the backbone of applications using Node.js, Golang and leveraging AWS for unparalleled reliability and performance. My experience spans the intricate world of Blockchain Development in Solidity, developing and deploying smart contract protocols for the decentralized landscape. I excel in using tools like Hardhat, Truffle, Ethers, Web3Js, IPFS, Metaplex, Chainlink, Git, and GitHub to ensure your blockchain applications run seamlessly. While my journey began in the realms of JavaScript and its frameworks, my focus has shifted entirely to backend development. This pivot has allowed me to hone my skills in Node.js, Golang and AWS, ensuring that your applications are not only functional but are built on a foundation that guarantees growth, scalability, and security. Whether it’s a decentralized application needing solid backend architecture, or any project requiring the meticulous integration of backend services with cloud solutions, I am the professional you need. Let’s turn your idea into a reality with a backend that powers your vision forward.

Result Oriented with over 15.6+ years of experience in full-stack engineering, blockchain architecture, and SaaS product development. Proven track record in scaling global platforms, building high-performing engineering teams, and leading digital transformation across Web3, DeFi, and enterprise blockchain ecosystems. Adept at aligning technical architecture with business strategy, delivering innovation in smart contracts, Layer 2 solutions, decentralized identity, and cross-chain interoperability. Senior Solution Architect | Cloud-Native Banking Platforms | OpenShift | Azure | Event-Driven Systems Accomplished Solution Architect with 10+ years of experience delivering large-scale, secure, and scalable systems in the banking and financial technology sector. Proven expertise in designing enterprise-grade microservices architectures, event-driven platforms (SAGA, pub-sub), and API-first ecosystems. Adept at driving reusable architectural blueprints, CI/CD pipelines, cloud-native deployments on Azure and OpenShift, and integrating security and governance guardrails. Strong background in data modeling, regulatory compliance, and system integration across dynamic and fast-paced environments. 🔹 Certified Blockchain Architect & Full Stack Developer with 15.6+ years of software engineering experience and 12.6+ years in decentralized technologies. I help global clients across the USA, UK, Switzerland, Singapore, and the UAE design, develop, and launch secure, scalable, and enterprise-grade Web3 solutions — from MVP to mainnet. My stack includes Ethereum, Polygon, zkEVM, BNB Chain, Hyperledger, and other next-gen protocols. 🧠 Core Blockchain Expertise * Smart Contracts: Solidity, Cairo, Hardhat, Foundry, Slither, Remix * Token Standards: ERC-20, ERC-721, ERC-1155, ERC-4626, Soulbound Tokens * Protocols: Ethereum, Polygon, zkEVM, Optimism, BNB Chain, Avalanche, Hyperledger * Infrastructure: Chainlink, The Graph, IPFS, Alchemy, Infura, Gelato * Frontend: Web3.js, Ethers.js, React.js, Next.js * Security: Certified in Smart Contract Security (Slither, MythX, Foundry fuzzing) * Advanced: Zero-Knowledge Proofs, Layer 2 Rollups, DAO tooling, Multi-sig wallets * Ethereum, Polygon, zkEVM, BNB Chain, Hyperledger Fabric 🚀 Existing Clients Projects I Deliver 🔶 1. For DeFi Startups: * Lending/Borrowing dApps * Yield farming + auto-compounding vaults * Token staking platforms with reward logic * ERC-4626 vaults, DEX integrations (Uniswap/Sushiswap) * DeFi Analytics dashboards + governance tokens * Liquidity pool strategies with risk analysis * DeFi Clients * NFT Projects * ZK (Zero-Knowledge) & Layer 2 Scaling * Enterprise Blockchain (Hyperledger & Tokenization) * FinTech ✅ Delivered: Cross-chain DeFi app (Ethereum ↔ Polygon ↔ zkSync), custom staking contracts, gas-optimized vaults. 🔷 2. For NFT Platforms: * Custom NFT minting engines (lazy, batch, whitelist) * Royalty-enforced marketplaces (ERC-2981) * Soulbound tokens (identity NFTs) * On-chain metadata, generative NFTs, IPFS/Arweave integration * NFT + DeFi fusion projects (staking NFTs for yield or access) ✅ Delivered: Multi-chain NFT launchpad, NFT staking for in-game assets, and curated NFT gallery with on-chain metadata. 🔶 3. For ZK and L2 Scaling Projects: * zkEVM smart contract development * Optimistic Rollups & fraud-proof system setup * zk-SNARKs & zk-STARK integration with zkSync, Scroll * Private voting apps, shielded token transfers * Layer 2 bridges & relayer logic ✅ Delivered: Zero-knowledge based identity protocol with off-chain storage and shielded voting using Semaphore. 🔷 4. For Enterprise & Tokenization Clients: * Private blockchain networks with Hyperledger Fabric * CBDC design, asset tokenization & compliance (RWA, real estate, bonds) * KYC/AML integration with on-chain ID verification * Blockchain-based supply chain traceability * Permissioned dApps with off-chain + on-chain sync ✅ Delivered: Enterprise tokenization platform for equity shares (ERC-1400), Hyperledger Fabric-based audit system for logistics firm. 🔒 Security-First Blockchain Engineering * Static + dynamic analysis: Slither, MythX, Echidna, Foundry * Formal verification of critical logic * Role-based permissioning, contract upgrades via UUPS/Proxy * Multi-chain deployment with test coverage and CI/CD pipelines * Languages & Frameworks: Solidity, Cairo, Web3.js, Ethers.js, React.js, Hardhat, Foundry, Remix * Token & Contract Standards: ERC-20, ERC-721, ERC-1155, ERC-4626, OpenZeppelin Libraries * Auditing & Security Tools: Slither, MythX, Smart Contract Audit, Formal Verification * Infrastructure & Integrations: Chainlink, The Graph, IPFS, Metamask Integration, Cross-chain Bridge * Use Cases Delivered: DeFi, NFT Marketplac My goal is to keep my clients on the leading edge of information transfer technologies, adding significant value to their business. "You think it. I build it !" Thank you for spending your valuable time on my profile.