AI Engineer and Solutions Architect with 10+ years of experience building scalable SaaS platforms, enterprise systems, and cloud-native applications. Over the past two years, I have been helping businesses integrate Generative AI, Large Language Models (LLMs), AI Agents, Retrieval-Augmented Generation (RAG), and workflow automation into production systems. I specialize in OpenAI, Claude, GPT-4, LangChain, LlamaIndex, Vector Databases, AI Chatbots, AI Search Systems, and enterprise-grade backend architecture using Python, Java, Spring Boot, AWS, PostgreSQL, MongoDB, Docker, and Kubernetes. I help companies move beyond AI demos and build production-ready AI products that scale securely and reliably. Over the last 10+ years, I’ve architected and scaled SaaS platforms, enterprise systems, and cloud-native applications used by startups and growing businesses across healthcare, fintech, logistics, travel, AI, and real estate industries. I specialize in Java, Spring Boot, Microservices, AWS, PostgreSQL, MongoDB, Kubernetes, and scalable backend architecture for high-performance SaaS platforms. Worked on platforms handling real-time workflows, payment systems, enterprise reporting, AI integrations, booking engines, analytics systems, and multi-tenant SaaS infrastructure. I’ve developed enterprise-grade platforms for healthcare, fintech, e-commerce, and real-time applications, focusing on scalability, security, and long-term maintainability. My expertise includes: ✔ High-performance REST APIs ✔ Microservices architecture ✔ Cloud-native AWS deployments ✔ Authentication & payment systems ✔ Enterprise integrations ✔ Performance optimization Whether you need to modernize a legacy Java application, build a backend from scratch, or scale an existing SaaS platform, I can help architect and deliver reliable production-ready systems. My Core Competencies 1. Java Development: - Core Java: In-depth knowledge of Java’s features, collections, concurrency, and multi-threading - Spring Framework: Expertise in Spring Boot, Spring MVC, Spring Security - Microservices: Designing and implementing microservices architecture with Spring Cloud - API Development: RESTful APIs with JWT, OAuth, and GraphQL integration 2. Mobile App Development: - Android Development: Skilled in developing native Android apps using Java and Kotlin - App Lifecycle: From UI/UX design to API integration and deployment 3. Database & Back-End: - Database Expertise: Proficient in MySQL, PostgreSQL, and MongoDB for secure, scalable data management - ORM: Working with Hibernate for object-relational mapping - Server-Side Scripting: Building efficient backends with Java and Spring. 4. Deployment & Cloud: - Cloud Deployment: Expertise in deploying Java-based applications on AWS, Azure, and Google Cloud - Containerization: Proficient with Docker for application containerization and management 5. Security & Performance: - Application Security: Implementing secure systems with Spring Security, OAuth, and data encryption - Performance Tuning: Optimizing application speed, database queries, and server-side performance AI & Generative AI Expertise ✔ AI Chatbot Development ✔ OpenAI API Integration ✔ Claude AI Integration ✔ GPT-4 Applications ✔ AI Agents & Agentic Workflows ✔ Multi-Agent Systems ✔ Retrieval-Augmented Generation (RAG) ✔ AI Knowledge Bases ✔ Enterprise Search Systems ✔ Semantic Search ✔ Embedding Models ✔ Vector Databases ✔ Document AI ✔ AI Workflow Automation ✔ Conversational AI Platforms ✔ AI SaaS Products ✔ LLM Evaluation & Optimization ✔ Prompt Engineering ✔ AI API Development ✔ AI Automation for Business Processes Industries I Serve - E-Commerce: Custom checkout systems, payment gateway integration, and scalable shopping carts - Healthcare: HIPAA-compliant mobile apps and backend systems for patient management - Finance: Developing secure and efficient transaction systems, real-time data processing - Education: Learning platforms and mobile apps to enhance educational experiences - Travel & Hospitality: Building booking engines, itinerary planners, and travel apps - Real Estate: Custom property listings, user-friendly property search apps What I Can Help You Build - SaaS backends - REST APIs - Microservices architecture - Authentication systems - Payment integrations - Cloud deployment pipelines - Enterprise dashboards If you need a reliable backend engineer to build scalable APIs, SaaS platforms, or cloud-native Java applications, let’s discuss your project. Keywords: Spring Boot, Java Backend, SaaS Development, REST API, Microservices, AWS, Scalable Applications, SaaS Architecture, Platform Engineering, Distributed Systems, Event-Driven Architecture, Cloud-Native Development, Enterprise APIs, Multi-Tenant SaaS, AI Integrations, Kubernetes, Docker, Kafka, DevOps, System Design, Scalable Infrastructure, High Availability Systems, Fintech, Healthcare Platforms, Booking Engines, Real-Time Systems

Hi, I’m Vijay Kumar Dogra - a Full Stack Developer specializing in Web Development, Mobile Applications, AI Solutions, SaaS Platforms, and Business Automation. I help startups, businesses, and growing companies transform ideas into scalable, high-performance digital products using modern technologies like React, Next.js, Node.js, Python, AI integrations, and cloud-based architectures. From MVP development to enterprise-level platforms, I focus on building reliable, user-friendly, and future-ready solutions that support long-term business growth. 🚀 Core Expertise ✔ Full Stack Web Development (React.js, Next.js, Node.js, PHP Laravel) ✔ Mobile App Development (iOS, Android, Flutter, React Native) ✔ AI Integrations & Automation Solutions ✔ SaaS Platform Development ✔ API Development & Third-Party Integrations ✔ Python Automation & Data Scraping Systems ✔ Dashboard & Admin Panel Development ✔ Cloud & Scalable Backend Systems ✔ Workflow Automation & Business Process Optimization 💻 Technologies I Work With • React.js, Next.js, Node.js • Python, Automation & AI Workflows • PHP Laravel • Firebase, Supabase • MongoDB, MySQL, PostgreSQL • AWS & Cloud Infrastructure • REST APIs & Third-Party Integrations • OpenAI & AI-Powered Applications 💡 Why Work With Me? • Business-focused development approach • Clean, scalable, and secure architecture • Strong communication and transparent workflow • Reliable delivery and long-term support • Focus on solving real business challenges through technology 🌍 Experience Across Industries I have worked on SaaS products, mobile applications, AI-powered systems, booking platforms, automation tools, dashboards, healthcare solutions, real estate systems, and custom business applications across various industries. 🤝 Let’s Build Something Great If you're looking for a developer who understands both business requirements and technical execution, I’d be happy to help turn your ideas into scalable and successful digital products. Let’s connect and discuss your project.

Hi Employers! I'm Usama Saleem - a university educated web, blockchain developer and graphic designer, working in the business for more than 4 years. Experienced essentially in Website development and UI/UX plan. How about we reach out and make some cool stuff together!

🟢 100+ successful projects | Top Rated Plus | 10+ years of experience 🟢 I help businesses collect reliable data, automate workflows, integrate APIs, and build AI-powered systems that reduce manual work and turn messy processes into clean, scalable, production-ready solutions. I’m Sergii, Senior Automation & AI Engineer at DataOx. For 10+ years, we’ve helped startups, small businesses, and growing teams build custom data extraction systems, workflow automation tools, API integrations, backend platforms, data pipelines, and practical AI automation solutions. What I can help you with: • Web scraping & data extraction Custom scraping systems for websites, marketplaces, directories, eCommerce platforms, real estate platforms, job boards, online portals, social networks, and other public or structured data sources. • Data processing & data pipelines Cleaning, structuring, normalizing, transforming, and preparing data for reporting, analytics, dashboards, CRMs, databases, Google Sheets, Airtable, internal tools, or AI systems. • Workflow automation & browser automation Automation systems that replace repetitive manual work, connect tools, handle business logic, run scheduled processes, and reduce operational workload over time. • API integration & backend systems REST API integrations, third-party API connections, custom API development, backend logic, database workflows, admin panels, internal platforms, and scalable business systems. • AI automation & AI-powered tools AI agents, ChatGPT / OpenAI API integration, Claude, Gemini, AI-driven workflows, document processing, natural language interfaces, AI-generated reports, classification, extraction, and decision-making support systems. • Existing system improvement Bug fixing, refactoring, stabilization, performance improvements, error handling, documentation, feature enhancements, and long-term support for existing automation, scraping, backend, or AI systems. Typical projects we build: • Web scraping and data extraction platforms • Price monitoring and competitor monitoring tools • Lead generation and contact data collection systems • Workflow automation and process automation tools • API integrations between CRMs, databases, SaaS tools, and internal systems • AI-powered assistants, AI agents, and business automation tools • Document parsing, classification, and reporting systems • Data pipelines, ETL processes, and structured datasets • Dashboards, admin panels, and backend web applications • Google Sheets, Airtable, Telegram bot, and email automation workflows Why clients work with us: • Strong experience with similar projects • Clear understanding of technical requirements and business goals • Reliable communication and structured project delivery • Clean, maintainable, and scalable architecture • Strong problem-solving approach • Ability to handle changing requirements and real-world edge cases • Production-ready solutions with error handling and clear documentation • Long-term support after the first version is delivered Tech stack and tools: Python, Java, FastAPI, Django, Spring Boot, PostgreSQL, MySQL, MongoDB, REST APIs, Selenium, Playwright, Scrapy, BeautifulSoup, Pandas, ETL pipelines, cloud services, OpenAI API, ChatGPT, Claude, Gemini, Google Sheets API, Airtable API, CRM APIs, payment APIs, and custom backend systems. I work best with clients who need more than just a quick script. If you need an experienced developer or technical partner who can understand the goal, clarify the scope, build a reliable solution, and support it over time, I can help. Send me a message with your project details, data sources, tools, API requirements, or current workflow, and I’ll help you define the best technical approach.

I build scalable backend systems using Java & Spring Boot that handle real-world traffic without breaking.I also support Angular frontend development to deliver complete end-to-end web applications. With 6+ years of experience, I specialize in developing robust APIs, microservices architectures, and cloud-based systems that are reliable, secure, and built for production. If you're facing issues like slow APIs, poor scalability, or need a backend built from scratch. I can help you design and implement a solution that actually works under load. What I can help you with: -Build REST APIs using Spring Boot & Spring Cloud -Design and develop microservices architecture -Backend performance optimization & scalability improvements -Database design (PostgreSQL, MySQL, MongoDB, Redis) -Secure applications using Spring Security & JWT -AWS deployment (SQS, SNS, ECS, Kafka) -Docker & CI/CD pipeline setup -Angular frontend support for full-stack delivery Experience Highlights: -Built and deployed scalable backend systems for finance, telecom, and SaaS applications -Developed microservices architectures handling production-level traffic -Designed REST APIs with strong focus on performance and maintainability -Integrated complex systems with third-party APIs and cloud services Tech stack: Backend: Java, Spring Boot, Spring Cloud, Hibernate, JPA Architecture: Microservices, REST APIs, Distributed Systems Database: PostgreSQL, MySQL, MongoDB, Redis Cloud & DevOps: AWS, Docker, CI/CD Frontend (Support): Angular, JavaScript, TypeScript I focus on writing clean, maintainable code and delivering solutions that work in real-world production environments. If you need a backend that can grow with your business, let’s connect.

Senior Full-Stack Engineer with 10+ years building mobile, web, AI, desktop, and IoT applications. I help startups and enterprises ship MVPs and scale apps 2x faster, with expertise in performance, reliability, automation, and cross-platform delivery. Core Expertise • Mobile & Desktop: Android, iOS, React Native, Kotlin, Swift, Tizen, WebOS, C++, C#, Delphi • Web & Backend: Node.js, .NET, TypeScript, JavaScript, Python, Java, Go • AI & Data: LLMs (RAG pipelines, Ollama, OpenAI, Anthropic APIs), LangChain, Hugging Face, TensorFlow, PyTorch, spaCy, Scikit-learn • Automation & Orchestration: n8n, Zapier, Make (Integromat), Airflow, Monday, CI/CD pipelines • Media Processing: OpenCV, FFmpeg, real-time video/audio streaming • IoT & Devices: Bluetooth, NFC, Alexa integration, Thermal Imaging • Cloud & Enterprise: AWS, Azure, Google Cloud, Firebase, MS Graph, REST, WebSockets, SSO (SAML, Keycloak) • DevOps: Git, Docker, Jenkins, Fastlane, Visual Studio, Xcode Specialized Solutions • Real-time video/audio solutions (FFmpeg, OpenCV, WebRTC) • AI-powered apps with LangChain, Hugging Face, n8n automations, and RAG pipelines Workflow automation with n8n, Zapier, Make, Airflow • IoT device integration (Bluetooth, NFC, Alexa) • Secure enterprise integrations (MS Teams, SSO, Keycloak) • Scalable backends & APIs (Node.js, .NET, Firebase, GraphQL)

I'm a senior full-stack engineer with 𝟏𝟓+ 𝐲𝐞𝐚𝐫𝐬 of experience, including nearly a decade building at scale for 𝐀𝐩𝐩𝐥𝐞 and 𝐀𝐦𝐚𝐳𝐨𝐧. Unlike most generalists, I also build production-grade AI features. That combination is rare, and it's why clients hire me. Whether you need a scalable web application, a complex backend system, or AI/LLM capabilities woven into an existing product, I can own it end-to-end, architecture through deployment, frontend through infrastructure. 𝐅𝐮𝐥𝐥-𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 React + TypeScript frontends with clean component architecture, real-time updates, secure auth flows, and performance tuned for real users. Java backends (Spring Boot, WebFlux, reactive systems), Node.js/TypeScript APIs, REST & GraphQL (Apollo), microservices design, and distributed data layers across DynamoDB, SQL, and NoSQL. I build applications that are testable, maintainable, and designed for scale from day one, not patched together after the fact. 𝐀𝐈 & 𝐋𝐋𝐌 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧 This is where I pull ahead. When a project calls for intelligence, a chatbot, a knowledge assistant, a RAG pipeline, automated workflows, I don't hand it off to a separate AI contractor. I build it myself, integrated cleanly into the same stack. GPT/Gemini integrations, retrieval-augmented generation, context-aware chat systems, prompt pipeline design, structured output with validation, and hallucination mitigation. AI that's engineered into the product, not bolted on. 𝐂𝐥𝐨𝐮𝐝 & 𝐈𝐧𝐟𝐫𝐚𝐬𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐞 AWS-native architectures, Kubernetes, Helm, Docker, CI/CD pipelines, and production observability with Prometheus, Grafana, and Datadog. SLO-driven monitoring and reliable deployment workflows. Features don't matter if they're not up, I make sure they stay up. 𝐖𝐡𝐲 𝐜𝐥𝐢𝐞𝐧𝐭𝐬 𝐜𝐡𝐨𝐨𝐬𝐞 𝐦𝐞 𝐨𝐯𝐞𝐫 𝐨𝐭𝐡𝐞𝐫 𝐬𝐞𝐧𝐢𝐨𝐫 𝐝𝐞𝐯𝐬:: Most full-stack engineers can't touch AI. Most AI freelancers can't architect real systems. I do both, and I've done it inside two of the most demanding engineering organizations in the world. 𝐒𝐞𝐥𝐞𝐜𝐭𝐞𝐝 𝐫𝐞𝐬𝐮𝐥𝐭𝐬: At Apple, built a React + TypeScript platform for large-scale test execution, developed an AI-powered internal support chatbot, and improved system observability, cutting incident resolution time by 30% and reducing deployment time by 30%. At Amazon, migrated critical systems from Oracle to DynamoDB, reduced infrastructure maintenance by 20%, designed resilient AWS-native services, and helped launch Amazon in new international markets. 𝐈'𝐦 𝐭𝐡𝐞 𝐫𝐢𝐠𝐡𝐭 𝐟𝐢𝐭 𝐢𝐟 𝐲𝐨𝐮 𝐧𝐞𝐞𝐝: A senior engineer who can own your product end-to-end. A full-stack application built properly, architecture-first, scalable, maintainable. AI or LLM features added to an existing product without breaking what's already there. A complex backend, a polished frontend, or both. A technical partner who ships production systems, not prototypes. 𝐇𝐨𝐰 𝐈 𝐰𝐨𝐫𝐤: Architecture-first. MVP fast, production-ready fast. Clean, testable code. Clear communication. Built for scale from day one. I don't build throwaway demos. I build systems that survive production, with or without AI. Let's talk.

👋 Hello I help startups and businesses launch scalable SaaS platforms, secure APIs, and production-ready systems that actually work, not just prototypes. With 4+ years of real-world experience, I build systems that automate workflows, integrate payments, and make teams more productive, all deployed reliably on AWS. I help businesses save time, reduce errors, and scale operations by providing secure, maintainable, and production-ready software solutions. 🎯 Here’s what I help clients achieve 🔥 Secure backends & APIs: Spring Boot microservices, authentication, and role management 🔥 Scalable AWS deployment: EC2, Nginx, SSL, CI/CD pipelines, production monitoring 🔥 Business dashboards & admin panels: Angular and NestJS enterprise dashboards 🔥 CRM & workflow automation: Reporting, messaging integrations, business processes 🔥 Fintech & payment systems: MPGS, 3DS challenge flows, mobile money integrations 🔥 AI & automation features: Chatbots, receipt scanning, smart workflows 📂 Recent projects ✅ Healthcare workflow system (HIPAA-aligned) ✅ Full CRM platform (auth, roles, automation workflows) ✅ AI-powered receipt scanner backend ✅ Timeline management system (microservices architecture) ✅ WhatsApp chatbot with Angular + Java admin panel ✅ End-to-end AWS deployment with CI/CD 🌟 I take your idea from system design → backend → frontend → deployment → automation. I deliver fast, reliable, and secure systems built to scale with your business. ✉️ Click Send a Message and let’s discuss how I can help you build a system that actually works. 🚀 Ready to start immediately

I build mobile and web apps that feel fast, reliable, and easy to use — whether native mobile apps (Kotlin for Android, Swift for iOS), cross-platform apps (Flutter, React Native), or modern web applications (React, Next.js, Node.js). My goal is to make your product run smoothly, scale easily, and grow with your business. With a Ph.D. in Computer Science and 10+ years of development experience, I've successfully delivered 90+ iOS, Android, and web applications on Upwork — including custom solutions for logistics, healthcare, booking, education, and business automation. 💡 What I Do Best - Cross-platform mobile app development with Flutter & React Native - Native Android app development using Kotlin - Native iOS app development using Swift - Web application development with React, Next.js, and Node.js - Design of clean, maintainable architecture with scalability in mind - Integration of REST APIs, Firebase, AWS, and Supabase - Support for offline mode, background services, and push notifications - Performance optimization, UX improvements, and deployment (App Store, Google Play, web hosting) 🧠 Why Clients Choose Me I combine strong technical expertise with a product mindset — not just delivering code, but building reliable, user-friendly products that support long-term growth. Whether you're building an MVP or scaling an existing application, I can help you choose the right tools and technology stack for both mobile and web. 💬 Let's Build Something Solid If you're looking for a developer who covers both mobile and web ecosystems, let's discuss your next project.

• 5+ years of experience as a Mobile App Developer specializing as an Android Developer and Flutter Developer. • Strong expertise as a Mobile App Developer with deep knowledge of Android Kotlin, Java, and Dart. • Proven background as an Android Developer and Flutter Developer across FinTech, AdTech, and EdTech projects. • Hands-on experience as a Mobile App Developer integrating third-party APIs for scalable applications. • Solid architectural mindset as an Android Developer focused on performance and UX. Are you looking for a reliable Mobile App Developer who can also act as a senior Android Developer or an experienced Flutter Developer? 🚀 I bring extensive hands-on expertise as a Mobile App Developer, delivering high-quality solutions as both an Android Developer and Flutter Developer. Whether you need a native Android solution or a cross-platform app, I’m ready to help. 📱 Android Developer Expertise As an Android Developer, I’ve delivered multiple production-ready applications with a focus on scalability and clean architecture. My experience as a Mobile App Developer allows me to approach Android development from both technical and product perspectives. Android Toolkit (Android Developer focus): • Java & Kotlin — core stack of every Android Developer project • XML, Material Design, Jetpack Compose — essential tools for any Android Developer • SQLite & Room — data handling by an experienced Mobile App Developer • Retrofit, OkHttp, Gson — API integration as a professional Android Developer • Dagger & Hilt — clean architecture every Android Developer should follow • Coroutines & Flow — asynchronous programming mastered by a senior Mobile App Developer Each app I build as an Android Developer meets high standards of performance and maintainability. 🌐 Flutter Developer Mastery As a Flutter Developer, I build fast, consistent cross-platform applications with a native feel. My role as a Mobile App Developer helps ensure business logic and UI remain aligned across platforms. Flutter Toolkit (Flutter Developer focus): • Dart & FlutterFlow — core stack of every Flutter Developer • Firebase Auth, Google & Apple Sign-In — secure solutions from a Flutter Developer • Google Maps API — location-based features by an experienced Mobile App Developer • Firebase Cloud Messaging — real-time updates from a senior Flutter Developer • BLoC & Riverpod — scalable state management used by every strong Flutter Developer Whether it’s CRM, LMS, or EdTech, I deliver results as a Flutter Developer with product thinking. 🏗️ Architecture & Best Practices As a Mobile App Developer, I apply proven patterns: • MVP, MVC, MVVM, MVI — standard for every Android Developer • BLoC & Riverpod — best choice for a scalable Flutter Developer workflow Clean architecture is a must for any professional Mobile App Developer. 🔒 Security & Performance Every Mobile App Developer project I deliver focuses on: • Data encryption • Performance optimization • GitHub, GitLab, Azure workflows This mindset separates a senior Android Developer and Flutter Developer from the rest. 💻 Databases & Experimentation As a versatile Mobile App Developer, I work with: • SQLite • PostgreSQL • Firebase I continuously experiment to grow as an Android Developer and Flutter Developer. 🎯 Let’s Build Your App If you need a results-driven Mobile App Developer, a reliable Android Developer, or a skilled Flutter Developer — let’s connect and turn your idea into a production-ready application.