I build smart contracts and Web3 systems that are meant to go live, not stay in testing. Most of my work involves handling real user flows, real transactions, and systems where mistakes are expensive. That’s why I focus heavily on security, edge cases, and clean architecture instead of just writing code that “works”. I’ve worked across DeFi protocols, DAO systems, token launch platforms, and full-stack dApps, contributing from contract design all the way to backend and integrations. What I Work On → Smart Contracts (Solidity) - Staking, rewards, vesting, token sale logic - ERC20, ERC721, and custom token models - Upgradeable contracts (UUPS / proxy patterns) - DAO governance structures → Security and Contract Design - Reentrancy protection and safe fund handling - Access control and permission design - Gas optimization (storage, execution efficiency) - Writing and testing with Hardhat and Foundry → Web3 Backend Systems - Node.js and Express APIs - Contract integrations and transaction flows - On-chain and off-chain data sync - Event handling and system design → Advanced Work - Chainlink oracle integrations - ECDSA signature verification - Zero-knowledge integrations (ZK-based systems) - Data indexing with The Graph How I Work → I don’t just code features, I design systems → I think in terms of failure cases, not just happy paths → I keep contracts simple, readable, and secure → I communicate clearly and stick to delivery timelines Experience I’ve contributed to multiple production-level Web3 products, including: → DeFi systems with staking and reward distribution → DAO governance platforms → Token-based ecosystems and launchpads → Applications used by active users, not just test deployments Why Clients Work With Me → Strong focus on security and correctness → Practical understanding of DeFi mechanics → Clean and scalable architecture → No overpromising, just solid delivery Let’s Talk If you need someone who can build reliable smart contracts and Web3 systems without shortcuts, feel free to reach out.

I am a Java Web Developer, working as freelancer, mainly in Upwork. I am very passionate with Java and JVM technologies. My experience mostly in developing Software As A Service (SaaS) platform, business computing and information system area, using Bootstrap, Angular JS or JSF as UI Components or web framework, Spring Core, Spring MVC or JBoss Seam as Restful API endpoint and or Integration framework, and Hibernate as favorite Java Persistence API (JPA) implementation wrapped by Spring Data component. If my clients requires no casual application or web server, I like to use Spring Boot for simpler development and deployment of the application. I am also interested in database design and software design. I believe that great software not only mediocre work of typing, but also comes from thoughtful process. I believe in TDD, and also believe that tests code must be written, organized as good as the source code it self and is integral part of the source code. I am a quick learner, and In my spare-time, I am writing some personal open source project and small proof-of-concept about java-related stuff in my GitHub public repository. My primary machine is linux desktop with 1TB NVMe SSD and 64GB or RAM. I have macbook pro 15 for testing purpose and to allow me mobile occasionally, if needed. Communication is important in remote work, and for this purpose I have 2 link dedicated internet connections to my workspace. If you need my detailed skill abilities, below is what I have experienced in: - Software Design, Database Design, and microservices/Micro-services/micro services architecture. - JPA 1.0, JPA 2.0, with Hibernate. - Bean Validation Specification with Hibernate Validator. - Dependency Injection with Java DI (JSR-330), Java Context and Dependency Injection for Java EE Platform (JSR-299), and Spring Core as most popular (but non-standard) Java Dependency Injection Framework. - Java Web Framework with Spring MVC and JSP, or Java Server Faces (JSF) with Facelet and Primefaces. - Spring Boot, Spring Data stack. - Generated / scaffolding web application using JHipster. - Java Web / Application server with Tomcat, Wildfly, or Websphere AS. - Logging with SLF4J as a wrapper to Log4J or Logback. - JUnit or Test NG as testing framework. - Ant, Maven or Gradle as build and dependency management tool. - HTML 5, CSS 3, JavaScript, JQuery, Twitter Bootstrap, transparency.js, and angular / angular.js - Third Party API such as Xero API, Open ERP Java API, Braintree Payment API, Stripe Payment API, and Social APIs. - Linux, Mac or Windows. - MySQL, PostgreSQL, Oracle, or Microsoft SQL Server for RDBMS. - Couchbase or Mongo DB for No-SQL solution. - Elasticsearch (ELK) stack or pentaho for data integration, advanced search, reporting and data analysis solution. Thanks, Resa

I am working as Sr. Java Back-end Developer along with ReactJS experience with front-end. If you are finding someone passionate about reusable, clean code, secure applications and agile methodology follower, then you are viewing right profile!. I have 8+ years of experience in software industry with Java based technologies. I have been involved across all phases of project development life-cycle. I am expert at database design or create base architecture for J2EE web applications. I have hands on experience in the following areas: ➤ Core Java ➤ JavaEE ➤ Alfresco Development (v4.2+) ➤ Spring MVC, ZK (ZKoss) ➤ Spring Security ➤ Spring DATA/JPA/Hibernate ➤ MySQL (database design and complex query expert) ➤ JSP/JSTL ➤ Jasper-Reports/Dynamic Jasper Reports ➤ Twitter bootstrap ➤ Lucene/Solr ➤ Indexing/Searching ➤ Tomcat/JBOSS ➤ GIT/SVN/CVS/P4V(Perforce) ➤ Struts 2.0 ➤ JIRA/Agile Looking forward

Hi! Thank you for visiting my profile. Are you: Struggling with turning your app idea into reality? Facing challenges with seamless cross-device functionality? Is your existing app's performance falling short? Finding it tough to integrate crucial third-party services? Concerned about security vulnerabilities? Need help with captivating UI/UX design? Dealing with budget constraints for a high-quality app? Worried about scalability as your user base grows? Pressured by tight deadlines? Considering long-term post-launch support? If any of these ring true for your app development journey, rest assured—I'm here to support you. ============ Profile Overview: ============ Hello, I'm Neeraj, a seasoned mobile app developer with over 8 years of expertise in utilizing React Native, Flutter, and native iOS and Android frameworks. Situated near the picturesque city of Chandigarh, Mohali. My key strengths lie in making realistic commitments, being responsive and responsible, focusing on business needs, and effective communication. While I can consistently propose optimal solutions, I also actively listen to my clients' viewpoints and consider their opinions. When you opt to collaborate with me, you can expect direct communication and hands-on collaboration. I never ever outsourcing tasks, I am leading my own in-house team, ensuring a dedicated approach to your project. As your primary point of contact, I am committed to bringing your vision to life. My quotes are always genuine, reflecting a focus on long-term commitment and success. ✓ Cross-Platform Development ✓ AI Apps ✓ User Interface (UI) Design ✓ Mobile App Architecture ✓ RESTful API Integration ✓ GraphQL ✓ Bluetooth Integration ✓ Geolocation and Maps Integration ✓ Version Control (e.g., Git) ✓ Agile Development Methodologies ✓ Push Notifications Implementation ✓ Database Management ✓ Third-Party Library Integration ✓ Continuous Integration/Continuous Deployment (CI/CD) ✓ Mobile App Testing and Debugging Let's schedule a call to explore further into your app idea and discuss how I can add value to its development. Sincerely, Neeraj K.

I am a Software Developer with around ten years of experience in Java, developing both the back-end and front-end of multiple software solutions. I have experience with each layer of development, from creating database structures and stored procedures to designing and developing the user interface of the applications. My knowledge and experience includes: - Programming languages: Java, PHP, C#, Python. - Frontend frameworks/ technologies: ZK, Vaadin, JSP, HTML5, Jquery, Javascript, AngularJS, AJAX. - Backend frameworks: Spring, Spring Security, Spring Batch, JSF, Hibernate, Mybatis. - Versioning Control: Git, SVN. - Databases: Oracle, MySQL, SQLite, SQL Server, Oracle Database, PostgreSQL - SOAP and REST web services - Tools: Maven, Ivy, JasperReports I'm always motivated with the idea of new challenges and learning new technologies. I'm willing to make the best effort to do an excellent job, even if it takes extra work researching the way to solve a problem. I have several years working on financial institutions, so I have experience working under pressure, meeting really strict deadlines and communicating with the users to evaluate options and generating solutions for their needs. I'm used to work as a team member as well as independently, following instructions or coming up with the solutions that best suites the needs of the business.

I'm a software engineer specialising in blockchain and backend development with 4 years of professional experience. I have a degree in Computer Science & Applied Mathematics, and I combine both applied research, and industry-level experience in blockchain development. I have been working in a research team developing a new protocol -- Byzantine Optimistic Reliable Broadcast, resulting in a successful publication of our paper on the International conference of OPODIS 2024. As well as that, I was working in three startups in the blockchain space, where I was a core developer of a Cosmos SDK based blockchain and of a consensus workflow execution layer (built on the pBFT-like protocol). I was working on development of Solidity smart contracts and on integration of the Symbiotic and EigenLayer restaking protocols. I was interning at Google twice while studying at the university (totalling to 7 months of full-time work at the Google office), and I have extensive experience with backend development in Java, Kotlin and Golang. I deliver high quality code with a focus on readability, efficiency, extensibility and good test coverage. Blockchain skills: ✅ Ethereum, EVM, Solidity ✅ Cosmos SDK, Ignite ✅ DeFi: smart accounts, ERC-4347, ERC-7579, ERC-1967, ERC-7201, ERC-20 ✅ Deep knowledge of consensus protocols: PoW, PoS, pBFT ✅ Zero-knowledge proofs, zk-snarks, zk-starks ✅ Staking & restaking protocols, Symbiotic & EigenLayer ✅ Tools: Foundry, Hardhat Backend skills: ✅ Proficient in Java, Kotlin, Golang ✅ Microservices architecture, event-driven architecture & CQRS ✅ RESTful API, GraphQL, gRPC ✅ Spring Boot, Spring MVC, Kafka, Hibernate, JDBC ✅ Databases: PostgreSQL, MySQL, MongoDB ✅ CI/CD: Docker, Kubernetes, AWS ✅ Frontend: Javascript, HTML, CSS ✅ Scripting languages: Python, Bash, Perl ✅ Tools: Git, Github, GitLab

I can code in a wide range of languages and frameworks. Here's a quick overview of what I can help with: Languages: Python, JavaScript, TypeScript, Java, C#, PHP, Swift, Kotlin, and more. Frontend: React, Vue, Angular,Next.js, HTML/CSS, and more. Backend: Node.js, Spring Boot, .NET, and more. Other areas: Databases (SQL, NoSQL, ORMs) DevOps (Docker, CI/CD, Infrastructure as Code) APIs (REST, GraphQL, gRPC) Testing (unit, integration, e2e) Algorithms and data structures System design and architecture I can write new code from scratch, debug existing code, refactor, optimize, explain concepts, or help you work through a design problem. Just let me know what you'd like to build or fix, and I'll jump right in!

I'm Ashish Verma, your dedicated crypto developer armed with over 8 years of hands-on experience shaping the future through blockchain technology. With an impressive 13+ years in the IT realm, I bring a unique blend of seasoned expertise to the forefront. 🚀 Pioneering Innovator: I've been a core member of 3 blockchain startups raising more than $10M USD. 🏆 Blockchain Guru: I've successfully launched 50+ cutting-edge blockchain and crypto projects that have thrived in today's competitive market. 🌐 Web 3.0 Visionary: I possess an in-depth mastery of Web 3.0, poised to lead the charge in the digital age transformation. 💡 Transformative Thinking: I've taken intricate ideas and transformed them into tangible, high-impact solutions, allowing clients to harness blockchain's full potential. 🎯 Unveiling My Proficiency in Blockchain 🎯 📜 Solidity: I'm a master in Solidity programming, Truffle, Ganache, Hardhat, Truffle and Unit Testing. 💼 Full-Stack: My skill set extends to React, Next.js, TypeScript, Node.js, and NestJS. 🌍 Multilingual: Fluent in Solidity, RUST, Substrate, and GO blockchain languages. ⚙️ Blockchains: Ethereum, Polygon, BSC, Avalanche, Algorand, Arbitrum, Starknet, Aptos, Sui, Solana, ZK-Sync, Cardano, Algorand, Substrate, and Layer-Zero. 🥇 NFT Standards: ERC-20┃ERC-223┃ERC-721┃IPFS┃ERC721┃ERC721A┃ERC1155. 📚 Domain Knowledge: 🔌 Custom Blockchain Solutions (Development / Integrations) 📊 Crypto Analytics Tools 💱 Cryptocurrency Exchange Development 🏭 Enterprise Blockchain Development 🌐 Solutions for Decentralized Finances (DeFi); 🧩 Decentralized Applications Development (Dapps); 💼Crypto Wallet Development 🧠 Smart Contracts Development 🤝 NFT & Blockchain Consulting 🎁 NFT Development, NFT staking/breeding Systems 📚 NFT Launchpad, NFT Marketplaces 🥇 ICO, STO, IDO, and IEO Launchpad Development. ⚙️ Layer-2 scaling and interoperability protocols. 🤖 Trading bots 📈 Investing Platforms with Blockchain 🔎 Smart Contract Audits 💰 Real World Assets (RWA) Why you should choose me as your blockchain developer: - Executed and launched several large platform projects successfully. - Currently the CTO at a huge web-3 social media app - Participated in International Blockchain Hackathons - I have written smart contracts to perform on-ramp and off-ramp crypto transactions - I successfully passed smart contract audits and also audited smart contracts - I am also a Blockchain consultant, with experience writing articles and documentation for highly reputable publications and clients. I'm committed to delivering innovative, ethical, and impactful solutions. Reach out today to work together on your Web3 project. Thanks, Ashish

I am a mobile developer with over 9 years of experience in mobile development (Android and iOS) and 8 years specializing in Flutter. I have successfully completed over 40 projects across industries including e-commerce, real-time tracking, chat and social media, crypto wallets and exchanges, enterprise management, and food delivery platforms. Mobile Development Expertise I architect Flutter applications using advanced state management techniques including BLoC, Riverpod, Redux, Provider, Cubit, and MobX. I implement clean architecture patterns (MVVM, MVC) with repository pattern and dependency injection. I have built complex applications including ride-hailing platforms with real-time driver tracking, delivery management applications, location tracking systems with geofencing, social media platforms with live messaging, crypto wallet applications, and e-commerce platforms. My technical experience includes: - Native platform code (Kotlin/Swift) for method channels, background services on Android (Foreground Services, WorkManager, AlarmManager) and iOS (Background Modes, Background Fetch, Silent Push Notifications), background location tracking with geofencing - Advanced Flutter patterns including custom render objects, platform views, isolates for heavy computations, widget lifecycle optimization, and memory management - Real-time location tracking with polyline rendering, map clustering, driver availability management, live ETA calculations, and route optimization - Database architecture with Drift (Moor) for SQL and Hive for NoSQL, including indexing, query optimization, and migration management - Real-time systems using WebSockets, Server-Sent Events, GraphQL subscriptions, Socket io for chat, push notifications, and live data synchronization - Payment gateway integration (Stripe, PayPal) and in-app purchases with subscription management - Deep linking and app linking with dynamic routing and deferred deep linking for attribution - Flutter Web and Flutter Desktop with responsive design systems - Automated testing (unit, widget, integration), CI/CD pipelines with GitHub Actions and Codemagic - Performance optimization, debugging, profiling, widget rebuild optimization, and memory leak detection - Material Design, custom animations, hero animations, physics-based animations, and third-party package integration - Firebase (Firestore with security rules, Cloud Functions in TypeScript, Authentication with custom claims, Remote Config, Crashlytics, Hosting) I follow OOP principles, design patterns, and SOLID architecture to write clean, readable, and maintainable code. Other Experience Backend Development: Substantial experience building backend systems using NestJS and TypeScript. My work includes RESTful and GraphQL API design with versioning and rate limiting, database architecture (PostgreSQL, MongoDB) with schema design and query optimization, event-driven architecture using Redis pub/sub and Bull queues, security implementation (OAuth 2.0, JWT, encryption, OWASP compliance), server deployment using Docker, NGINX, and VPS optimization, and performance monitoring with Sentry. Blockchain & Smart Contract Development: I architect and deploy production smart contracts on multiple EVM chains with expertise in advanced Solidity patterns including Diamond Pattern (EIP-2535), Proxy Patterns (UUPS, Transparent, Beacon) for upgradeability, deployment on zkEVM chains (zkSync) and Optimistic Rollups (Base, Optimism, Arbitrum), ERC standards (ERC-20, ERC-721, ERC-1155), security best practices (reentrancy guards, access control, gas optimization), and Web3.js/Ethers.js integration for dApp connectivity and wallet integration (MetaMask, WalletConnect). Additional Skills: Prompt engineering with Claude, ChatGPT, and Gemini, workflow automation using n8n and Node.js, project management and technical leadership with code reviews and mentoring, client consultation and solution architecture, technical documentation, and Agile development with Git. I focus on delivering production-grade applications that are scalable, performant, and maintainable. I collaborate with stakeholders to understand business requirements and architect solutions that solve real problems while ensuring code quality and long-term maintainability.

A software engineer with diverse experience, capable of turning ideas into software solutions. While my main focus and strengths are backend engineering, architecture, quality, and problem solving, I excel in cooperating with experts from other domains and executing all of that with clear communication and professionalism. # Experience: - Master's degree in Computer Science. (5 years) - 19+ years of programming. (8 in school, 11+ professionally) - 10 years of writing Rust. - 5 startups, Memgraph, Vector, Tooluno, Hyper Video, and Tero, as a software engineer/architect. - 2 foreign government agencies, as an outside contractor. # Technologies: Expert: - Rust - Graph theory Intermediate: - AI / Machine Learning - CUDA / OpenCL / GLSL / HLSL - C / C++ / Java - Blockchain / Cryptocurrencies - Vulkan / OpenGL - Kubernetes / Docker - Git / GitHub - AWS - Redis - Flutter Novice but can rapidly become intermediate: - JavaScript - Python - SQL / NoSQL - PostgreSQL - Solana # Larger projects: Professional: - Database for storing and handling graphs. (Memgraph) - Elliptic curve cryptography library for DeFi platform. (zkSync, via UpWork) - Open source software for moving logs from location A to location B. (Vector, via UpWork) - Software for trading cryptocurrencies. (private venture) - HFT crypto data retrieval and broadcasting program. (via UpWork) - OpenStreetMap planetwide graph data normalization program. (via UpWork) - A platform for fixing broken equipment. (Tooluno) - Software for ensuring quality of telemetry data. (Tero) Personal: - Game engine for Minecraft styled games and as an environment for raising AI. - Technology for knowledge representation and manipulation using advance graph theory. School: - Physical tokens for voting on elections. - Bluetooth based social media network on Android. - 3D visualization and manipulation of Facebook threads. - Meta optimizer. - Framework for component based programming. - Software for issuing and handling x.509 certificates. - Web store for selling souvenirs. - Website to connect and advertise businesses. - Software for solving high school level math problems and displaying the way to solve it on paper.