Upwork Expert-Vetted Talent (Top 1%) Microsoft Certified AI Engineer (Certification number: DEB32A-P5EE8C) Fullstack Developer | Software Engineer | Solutions Architect | AI Engineer | UI/UX Designer Tech Stacks Languages & Frameworks: C / C++ / C# / .NET / Unity / Java / JavaScript / TypeScript / Python / Rust / PHP / VB Razor Pages / CSS3 / Maven / Spring / Angular 2+ / React.js / Redux / jQuery / HTML5 / JSX / XAML / XML/XSLT / ASP.NET MVC / ASP.NET Core / .NET Framework / DevExpress UI / Spring Framework / Spring Boot / Spring Cloud / JavaFX / QT / QML Databases: MySQL / PostgreSQL / MSSQL / NoSQL / MongoDB / Azure Cosmos DB / Redis / Firebase Realtime Database DevOps & Containerization: Docker / Kubernetes / Azure DevOps AI & Machine Learning: Machine Learning / Deep Learning / TensorFlow / PyTorch / MATLAB / Azure Cognitive Services / Azure OpenAI Services / Azure AI Video Indexer / Azure AI Prompt Flow / Google Assistant SDK Blockchain Development: Ethereum / Binance Smart Chain / Solana / Stellar / Smart Contract Development / IoT Blockchain Technologies Additional Tools & Platforms: QuickBooks Online (Intuit) App Development / Shopify App Development Full Stack Development Services App Development: Mobile, Web, and Desktop Applications, Macros & Scripts Blockchain Development: Smart Contract Development and Blockchain Integration for Ethereum, Binance Smart Chain, Solana, and Stellar Algorithmic Trading: Algo Trading Platforms for Stocks and Cryptocurrency Dashboards & Analytics: Custom Dashboards, Metrics, and Business Intelligence Solutions Custom CRM & ERP Systems: Design, Development, and Integration of Customized CRM and ERP Solutions Database Management: Database Design, Optimization, Maintenance, and Integration for MySQL, PostgreSQL, MSSQL, NoSQL, MongoDB, and other leading database systems Software Integrations: Third-Party Software Integration and IT Security Implementations AI & Cognitive Services: Development of Machine Learning, Deep Learning, and Cognitive AI Solutions using Azure AI Stacks (Cognitive Services, OpenAI, Prompt Flow, Video Indexer) and Google AI SDK

I’m Sanket Mokashi, a seasoned Senior Software Developer with over 8 years of experience specialising in creating dynamic and scalable web applications. My expertise lies in Rust, Python, Java, React, Node.js, and REST, among other advanced technologies. Starting my freelance journey in 2016, I’ve developed a knack for rapid learning and adapting to new technologies, evidenced by my contributions to significant projects at Amazon Lab126, where I led the India team, and other reputable organisations. In addition to leading teams, mentoring junior engineers, and ensuring the seamless integration of software and hardware interfaces, I have extensive experience in AI-powered development. I implemented a Retrieval-Augmented Generation (RAG) pipeline using Langflow and a custom MCP server to automate EC2 action ticket handling—reducing manual support intervention by 40%. I have also built an LLM-powered chatbot, leveraging Claude 3.5/3.7 with a vector database knowledge repository, serving over 50,000 daily users as an internal knowledge centre. My expertise extends to designing AI-driven automation pipelines for data-intensive workflows and integrating generative AI solutions into enterprise applications. I’ve spearheaded the implementation of event-based architectures, microservices, and cloud-native solutions leveraging AWS services, demonstrating my capability in both technical leadership and hands-on development. Let’s connect to discuss how I can bring your vision to life with my versatile programming skills, deep AI/LLM expertise, and a commitment to delivering innovative, high-impact solutions.

5M software End-Users Impacted | $200K+ Total Earnings| Expert-Vetted (Top 1% Upwork) | 26 Projects | 100% Job Success | 12+ Years on Upwork | 5339+ Hours Worked | TOP RATED PLUS – Top 3% of companies | 15+ Countries Covered 🙈 “Can we just quickly fix this?” 🙊 “It’s probably just a small change.” 🙉 “Let’s ship first and think later.” I am a CEO and Business Manager at Peppernode. I help create systems where architecture matters, decisions matter, and the cost of mistakes is higher than the cost of doing it right. Call me Illia. ✅ Full Stack Developer React ✅ React Developer ✅ React Native Developer ✅ React Native Mobile Developer ✅ Python Developer ✅ Front end Developer ✅ Mobile App Developer ✅ SaaS Developer With 12+ years of experience, I specialize in building scalable SaaS platforms, high-performance mobile applications, and production systems designed for long-term growth. I work as a Full Stack Developer React, React Native Developer, React Developer, Python Developer helping startups and established businesses transform ideas into reliable products that scale. I bring experience as a web developer, mobile app developer, and business analyst, connecting business goals with practical technical execution. My react native full stack background helps align product strategy, architecture, and delivery. 🏆 Why Clients Choose Me As a Full Stack Developer React with 31 successful projects delivered across 15+ countries, I've helped build products now serving more than 5 million end-users worldwide. With 100% Job Success, $200K+ earned, and 5,339+ hours worked on Upwork, I bring proven experience designing scalable applications, validating product strategies, and helping businesses make the right technical decisions from day one. 🚀 SaaS Product Development I build modern SaaS platforms as a Full Stack Developer React using React, Python, Firebase, scalable architecture designed for reliability and growth. I work as a full stack developer react firebase delivering connected experiences across frontend and backend systems. My experience includes architecture planning, MVP development, frontend/backend implementation, payment integrations, and product evolution. 📱 React Native App Development As a React Native Developer and React Native Mobile Developer, I build cross-platform applications delivering consistent experiences across iOS and Android. As a React Developer and mobile app developer, I deliver React Native Mobile solutions built for reliability and performance. As a react native developer expo specialist, I move products from MVP to production while maintaining a high-quality user experience. My experience includes mobile app development react native projects for startups and businesses requiring speed, flexibility, and long-term scalability. My work includes React Native and Expo development, feature delivery as a full stack developer react native, mobile MVPs and enterprise applications, API integrations, App Store and Google Play releases, performance optimization, product support. I have experience as a node js react native mobile developer building connected mobile ecosystems powered by scalable backend services. 🍽 Restaurant Ordering Systems I have experience developing restaurant ordering solutions serving thousands of daily users, with a strong focus on reliability, operational efficiency, and seamless customer experiences. Several included React Native Mobile experiences for customers and operational teams. These systems require solid architecture and stable integrations. 📌 Existing Product Modernization Many teams come to me after moving too fast. As a Full Stack Developer React, I improve existing applications through refactoring unstable codebases, optimizing performance bottlenecks, introducing scalable architecture, reducing technical debt, expanding functionality without sacrificing maintainability. My goal is building products that evolve reliably. 🤖 AI Integrations & Automation I work with OpenAI API, Gemini, LangChain, Copilot, and modern AI workflows to build intelligent product experiences and automation solutions, including AI-powered features, chat interfaces, workflow automation, knowledge retrieval, and productivity enhancements. 🔧 Workflow & Tech Stack Discovery and planning begin with business analysis, technical discovery, architecture decisions, and product strategy. Frontend technologies include React, React Native, Expo, TypeScript, JS, HTML5, CSS. Backend development is built with Python, FastAPI, Django, Node.js, REST APIs, GraphQL, PostgreSQL, MySQL, Firebase, Stripe integrations. As a python developer, I focus on maintainable systems, integrations, architectures designed for long-term evolution. 🚀 Need a Full Stack Developer React, React Developer, React Native Developer, or Python Developer who thinks beyond code and builds products designed to scale? Let’s talk.

✅ 15+ years of overall programming experience. 🗃 50+ successfully completed projects on Upwork. 🎓 Master's degree in Applied Mathematics and Informatics. Specialize in: 💎 Web Development 💎 Desktop Development for Windows 💎 Mobile Development for iOS / Android / Cross-platform 💎 MS Dynamics 365 / Salesforce 💎 UI / UX Design 💎 VR & AR Development using Unreal Engine / Unity 3D 💎 Artificial Intelligence/Machine Learning 💎 Project / Product Management 💎 Technical Oversight / Solution Architecture Expert in: C#, JavaScript, TypeScript, MS SQL, MySQL, PostgreSQL, MongoDB, ADO.NET, Entity Framework, OData, WCF Services, SOAP, REST, ASP.NET, ASP.NET MVC, ASP.NET Core, WebAPI SignalR, WinForms, WPF, ClickOnce, WinServices, MSMQ, DirectX/OpenGL, 3D Graphics, HTML, CSS, JavaScript, JQuery, Angular, React, Blazor, Vue, ElasticSearch/Solr.NET/Lucene, Redis, Azure, AWS.

🌟8+ Years Experience | 50+ Projects | 20,000+ Hours | $900K+ Earned | Upwork Top Performer | Flutter Developer | Mobile App Developer I’m a Flutter developer, mobile app developer, full stack developer, and web developer with 8+ years of experience building, fixing, and scaling mobile products for startups and growing companies. My work spans mobile app development, web development, and backend-connected product work, with a strong focus on clean architecture, smooth user experience, reliable delivery, and scalable app development. I’ve worked across Flutter, Flutter Dart, Flutter Firebase, React, React Native, Xamarin developer projects, Xamarin Forms, Xamarin.Forms, .NET MAUI developer builds, Swift developer work, SwiftUI, iOS, Android, iOS developer tasks, iOS Swift, Android developer tasks, Android Kotlin, Kotlin, native app developer projects, AI app development, MVP development, API integration, and cross platform mobile app architecture. I also support teams that need a practical full stack developer who can connect mobile apps with APIs, dashboards, cloud services, and web systems without slowing the project down. That mix of mobile app development and web development lets me work across the full product, not just one part of it. On Upwork, I’ve delivered 50+ projects, earned $800K+, and worked 20,000+ hours helping clients launch MVPs, modernize old apps, fix unstable codebases, and move products into production. That experience taught me how to balance speed with quality, especially when a project needs to ship quickly but still be stable enough for real users. It also taught me how to work with different teams, different product stages, and different technical constraints without losing momentum. For new products, I help with MVP development from concept to launch. For existing products, I step in to improve architecture, refactor weak areas, and make the app easier to maintain and scale. If you’re building a cross platform mobile app, I can help choose the right direction between Flutter, React Native, .NET MAUI, Xamarin migration, or native app development depending on the product goals, timeline, and long-term plan. I focus on making those choices practical, not trendy, so the app can grow without becoming harder to manage. I’m also a strong fit for AI app development projects where the product needs more than a basic interface. That might mean smart workflows, automated actions, backend logic, or API integration that connects the app to real business systems. In those projects, I pay close attention to stability, data flow, security, and the user experience, because a useful feature only matters if it works reliably in production. 💡 Areas I specialize in - SaaS and startup MVP development - from idea to production-ready MVP. - Cross platform mobile app architecture - Flutter, React Native, and .NET MAUI. - App modernization and legacy migration - Xamarin to .NET MAUI, Flutter, or React Native. - API integration and backend connectivity - for apps that need stable data flow and real-time features. - AI app development and product automation - for teams that want smarter app experiences. - Continuous delivery, refactoring, and codebase optimization - to keep existing products moving forward. - Mobile app development for iOS and Android - with a focus on stability, performance, and usability. - Full stack developer support - when mobile work needs web, API, or backend coordination. - Native app developer support - when the project needs platform-specific quality and performance. - React Native developer support - for teams already working in JavaScript-based mobile stacks. - Swift developer and iOS developer support - for polished Apple ecosystem apps. - Android developer support with Kotlin - for strong native Android performance. - Flutter developer support - for fast cross platform mobile app delivery. - Xamarin developer support - for legacy apps that need modernization or migration. - .NET MAUI developer support - for teams moving toward a modern Microsoft stack. - Cross platform mobile app delivery - when one codebase needs to support iOS and Android efficiently. I’m a good fit when you need a mobile developer who can think beyond screens and help shape the full product. Whether the goal is a fresh MVP, a native app for iOS or native Android or a cross platform mobile app that can grow over time, I focus on code quality, maintainability, and practical results. I also make sure the work stays aligned with product goals, so the app is not just built well, but built in a way that supports growth and future updates. 🚀 If you need a Flutter developer, React Native developer, Xamarin developer, .NET MAUI developer, Swift developer, iOS developer, Android developer, Kotlin developer, mobile app developer, web developer, MVP development specialist, API integration expert, or full stack developer who can bring structure to a complex build and get it shipped, I’m ready to help.

I have significant experience in software development and UI/UX, where I managed to: ✅ Develop desktop and mobile applications, targeting Windows, Mac, iOS, and Android. ✅ Design prototypes for mobile applications and websites. ✅ Working with RDBMS like MS Sql Server, Mysql, Sqlite, Firebird, Postgres، Access. ✅ Dealing with Web technologies and services using REST, XML, JSON, and WEB protocols, including TCP, UDP, HTTP, FTP, SMTP. Check out my portfolio for my past work and further information. Let's get the job done 💪

Industry Expert Software Developer - Previously @ IBM, Microsoft Expert Vetted, Top Rated Developer | Scalable, Clean, Documented Code Always Technologies: - MongoDB, ExpressJS, React, NodeJS - React Native, Swift, Flutter - Python, Ruby, Ruby on Rails, PHP - .NET, C#, ASP.NET - OpenAI, LLM, Generative A.I Let's connect and discuss your project.

👋 Hi! I’m a 🏆 ⭐️⭐️⭐️⭐️⭐️Top Rated Senior Full Stack Developer / Front End Developer and Head of Engineering at GroupBWT - a 100+ member software company with over 15 years of experience building SaaS platforms, automation systems, data-driven tools, and large-scale enterprise applications. As a Full Stack Developer and Front End Developer, I design and deliver complete end-to-end systems with a focus on long-term scalability and maintainable architecture. My role as a Full Stack Developer includes system design, backend logic, and infrastructure decisions, while as a Front End Developer I ensure fast, responsive, and conversion-focused interfaces that perform well under real production load. What we deliver for our clients: ✅ SaaS products supporting 30,000+ active users with real-time collaboration features ✅ Platforms processing over 70,000 API requests per day ✅ Automation systems that reduce manual workflows by 50–65% ✅ Scalable architectures designed to handle 5–8× traffic growth without redesign 🔁 What I Do 📦 End-to-End Application Development (Full Stack Developer / Front End Developer) As a Full Stack Developer, I build complete systems from scratch, including architecture decisions and deployment strategies. As a Front End Developer, I focus on UI structure, performance, and usability in real production environments. 🔹 SaaS platforms 🔹 Admin dashboards & internal toolsefficiency 🔹 Real-time systems 🔹 Multi-tenant architectures 🔹 Subscription & billing systems Across all projects, I work as a Full Stack Developer responsible for system consistency from frontend to backend. 🎨 Frontend Engineering (Front End Developer focus) As a Front End Developer, I build interfaces that remain stable under heavy usage and complex state changes, while aligning closely with backend systems built by Full Stack Developers. 🔹 React / Next.js applications with reusable architecture 🔹 State management systems 🔹 Tailwind & UI systems 🔹 Performance optimization 🔹 Real-time UI updates connected to Full Stack Developer event systems The goal of every Front End Developer implementation is predictable performance and clean UI behavior. ⚙️ Backend Engineering (Full Stack Developer focus) As a Full Stack Developer, I design backend systems with reliability, scalability, and observability in mind, ensuring smooth interaction with Front End Developer interfaces. 🔹 REST & GraphQL APIs 🔹 Microservices architectureindependently 🔹 Async workers 🔹 WebSockets and real-time systems 🔹 External API integrations Each Full Stack Developer decision is made with long-term system evolution in mind. 🧩 Recent Experience (Full Stack Developer / Front End Developer) ✅ Multi-Tenant SaaS Platform (React + Node js + Python) Lead Full Stack Developer for a platform serving 50K+ monthly users and 30+ organizations.
 ✔ 100K+ daily API calls • 25M+ records • Billing for $500K+/year ✅ Enterprise CRM (React + Node js) Primary Full Stack Developer for a CRM used in 12 countries.
 ✔ Automated workflows cut manual work by 70%
 ✔ 200K+ processed events/day • 8 API integrations ✅ Scheduling Platform (React + Node js + Python) As a Full Stack Developer, designed booking logic for 20K+ bookings/month.
 ✔ Real-time availability (<80ms)
 ✔ Payment flows processing $1M+ annually ✅ Data Platform (Python + React) End-to-end ownership as a Full Stack Developer, delivered pipelines processing 3M+ records/day.
 ✔ 85% faster data prep • <1s dashboard latency ✅ Workflow Automation Engine (React + Node.js) Built as a Full Stack Developer full automation replacing spreadsheets and manual operations.
 ✔ 40K+ tasks/day • 92% fewer errors • 70% less manual work 🤝 Why Clients Choose Me as a Full Stack Developer and Front End Developer ✔ True Full Stack Expertise With 16+ years as a Full Stack Developer, I deliver complete systems, not fragments. ✔ Mastery of React, Node js, and Python All three technologies are used deeply and consistently across my projects as a Full Stack Developer. ✔ GroupBWT Strength 🔹 Since 2009
 🔹 100+ engineers
 🔹 Dedicated Full Stack Developer division
 🔹 Proven reliability and fast communication ✔ Business Impact Clients report:
 ➡ 50% faster delivery
 ➡ 60% lower manual overhead
 ➡ 10× fewer bugs after release
 All thanks to proper Full Stack Developer engineering principles. 💻 Tech Stack (Full Stack Developer / Front End Developer) Languages: JavaScript, TypeScript, Python, PHP Frontend: React, Next.js, Vue, Angular, Tailwind, Material UI Backend: Node.js, NestJS, FastAPI, Flask, GraphQL, REST Databases: PostgreSQL, MongoDB, MySQL, Redis Cloud & DevOps: AWS, GCP, Azure, Docker, Kubernetes, CI/CD Architectures: SaaS, microservices, event-driven systems 🚀 If you need a scalable web platform - let’s connect. ➡️ Invite me to your job, and I’ll help design and build a reliable production system.

🔵 14+ years developing first-class web, mobile and AI apps that achieve business goals and hit the mark. As an AI developer and web developer, my expertise led my team to work with Fortune 500 companies such as Philip Morris, Coca-Cola, DANONE, McDonald’s (Ukraine), and Kimberly-Clark. I started as a programmer in 2006. Now, I'm CTO at Brights — a software company focused on web, mobile and AI products, with 120+ Mobile app developer s and Web developer s who specialize in AI Chatbot systems, advanced AI Integration solutions, AI Saas and Mobile app development. As a deal closer, I also work closely with clients during product strategy and delivery. At Brights, we support companies through every stage of development backed by experienced AI developer, AI Chatbot, AI API Integration, Mobile app developer, and web developer — from MVPs to scaling including AI developer | AI Chatbot | AI API Integration | Mobile app developer. Our experience includes API integration, complex API integrations, and enterprise-grade AI API Integration. Within the last 14 years, I have delivered 300+ projects across fintech, insurtech, healthcare, eCommerce, real estate, education, logistics, and more as an AI developer | AI Chatbot | AI API Integration | Mobile app developer. 👩‍💻 Technical stack I cover as an AI developer | AI Chatbot | AI API Integration | Mobile app developer: Front-end: • Vue.js, React, Angular, Next.js, Redux, react native Back-end: • ASP.NET, PHP, Node.js, GraphQL Mobile: • React Native, iOS, Android, with support from a dedicated Mobile app developer and Flutter developer as well as Mobile game developer Artificial Intelligence tech stack I cover as an AI developer | AI Chatbot | AI API Integration: • Python developer workflows, LangChain, GPT-4o, gpt-3, OpenCV, Hugging Face, RAG, LLM, AI machine learning, and scalable machine learning pipelines Data & Architecture: • PostgreSQL, MongoDB, Redis, Elasticsearch for both mobile app marketing and web • Supported by experienced data scientist and full stack developer teams Integrations: • Analytics, CMS, Swagger, botpress, chatbots, AI API, and automation systems with reliable API integration If you are looking for AI developer | AI Chatbot | AI API Integration or Mobile app developer with strong mobile app design experience (Figma mobile app) - drop me a line.

I’m a Full Stack Developer, SaaS Developer, MVP Developer and AI Integration Developer focused on building production-ready web applications, SaaS platforms, MVP products, AI-powered applications and scalable internal tools. My work sits at the intersection of Full Stack Development, SaaS Development, MVP Development, AI Integration, Backend Development and product architecture. I help founders, startups and growing teams turn early product ideas into real software products, from validation-stage prototypes to launch-ready SaaS platforms, dashboards, admin panels, customer portals, workflow tools and AI-enabled applications. As a Full Stack Developer, I work across frontend, backend, databases, APIs and product logic. My frontend work is usually React and Next.js based, while my backend work often involves Node.js, Python, FastAPI, REST APIs, authentication systems, database architecture, third-party integrations and scalable backend services. As a SaaS Developer, I focus on building SaaS products that can support real users, real workflows and long-term product growth. This includes multi-role dashboards, user permissions, authentication, subscription-ready flows, payment integrations, admin panels, reporting systems, customer portals, API integrations and operational tools that teams can confidently use after launch. As an MVP Developer, I help founders and product teams move quickly without building throwaway prototypes. I focus on the core user journey first, then design the technical foundation around what the product needs to become. My MVP Development work helps teams launch faster while keeping the product maintainable, scalable and easier to improve after the first release. As an AI Integration Developer, I build AI-powered features inside real products, not isolated demos. My AI Integration work can include AI agents, AI workflows, LLM-based features, automation logic, data processing, AI-powered dashboards, chatbot features, recommendation systems and backend systems that connect AI functionality with real business workflows. As a Backend Developer, I design and build the technical foundation behind SaaS platforms, MVP products and AI-powered applications. This includes APIs, database models, authentication, authorization, background jobs, integrations, backend workflows and scalable service logic that keeps products reliable as they grow. Clients typically work with me when they need: * a Full Stack Developer who can own frontend, backend, databases and APIs * a SaaS Developer who understands product architecture and long-term scalability * an MVP Developer who can turn an idea into a launch-ready product * an AI Integration Developer who can add practical AI features into real software * a Backend Developer experienced with Node.js, Python, FastAPI and REST APIs * a Full Stack Developer for SaaS MVPs, dashboards and internal tools * a SaaS Developer for authentication, permissions, payment flows and admin panels * an MVP Developer for startup products, early-stage platforms and validation builds * AI Integration support for automation, AI agents, AI workflows and LLM-based features * React and Next.js web applications connected to stable backend systems * scalable API-driven products built for real users and future growth * internal tools, CRMs, portals, dashboards and operational platforms * backend-connected SaaS platforms with clean database architecture * product modernization, technical rebuilds and architecture improvements A large part of my work as a Full Stack Developer, SaaS Developer, MVP Developer and AI Integration Developer focuses on: * Full Stack Development for SaaS platforms and web applications * SaaS Development from MVP to scalable product architecture * MVP Development for founders, startups and early-stage products * AI Integration for SaaS products, dashboards and automation workflows * React and Next.js frontend development * Node.js and Python backend development * FastAPI, REST APIs and third-party API integrations * database architecture with PostgreSQL, MongoDB and Redis * authentication, authorization and role-based access * dashboards, admin panels, CRMs and customer portals * workflow automation and AI-enabled business logic * backend systems for AI-powered applications * internal tools and operational platforms * scalable product architecture for growing teams * API-first software products built for real business use My Full Stack Developer work is focused on making sure the frontend, backend, database, APIs and integrations work together as one stable product. My SaaS Developer work is focused on building products that can support real users, repeated workflows and long-term product growth. My MVP Developer work is focused on helping teams launch the right first version quickly and intelligently. If you need a Full Stack Developer, SaaS Developer, MVP Developer can support your product end to end, feel free to invite me!