TOP RATED PLUS - Top 3% Talent on Upwork AI Product Engineer | Full Stack Architect | SaaS Development Specialist I help startups, founders, and growing businesses build AI-powered products, modern SaaS platforms, and scalable web applications that solve real business problems. Over the last 10+ years, I've worked with startups, agencies, and enterprise clients to design, architect, and develop high-performance applications using modern JavaScript technologies, cloud infrastructure, and the latest advancements in Artificial Intelligence. Today, my primary focus is helping companies integrate AI into their products and workflows through Large Language Models (LLMs), AI Agents, Agentic Workflows, Retrieval-Augmented Generation (RAG), AI Automation, and intelligent business systems. Whether you're building a new AI startup, modernizing an existing platform, or integrating AI capabilities into your current product, I can help you move from idea to production. 𝗪𝗵𝗮𝘁 𝗜 𝗖𝗮𝗻 𝗛𝗲𝗹𝗽 𝗬𝗼𝘂 𝗕𝘂𝗶𝗹𝗱: ✅ AI-Powered SaaS Applications ✅ AI Agents & Multi-Agent Systems ✅ OpenAI, Anthropic Claude & Gemini Integrations ✅ AI Chatbots & AI Assistants ✅ RAG (Retrieval-Augmented Generation) Systems ✅ AI Knowledge Bases ✅ AI Customer Support Platforms ✅ AI Workflow Automation ✅ AI Content Generation Platforms ✅ Custom GPT Applications ✅ Enterprise Web Applications ✅ Marketplace Platforms ✅ CRM & ERP Systems ✅ Internal Business Tools ✅ Dashboard & Analytics Platforms ✅ Real-Time Applications ✅ API Development & Integrations ✅ Cloud-Based SaaS Products 𝗔𝗜 & 𝗟𝗟𝗠 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲 • OpenAI GPT-4o / GPT-4 • Anthropic Claude • Google Gemini • LangChain • LangGraph • Vector Databases • Pinecone • Weaviate • ChromaDB • RAG Architectures • AI Agents • Agentic Workflows • Prompt Engineering • Function Calling • AI Automation • MCP Servers • Semantic Search • AI Copilots • Document Intelligence Systems 𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱 • React.js • Next.js • Angular • TypeScript • JavaScript • Redux • Tailwind CSS • Material UI • ShadCN 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 • Node.js • NestJS • Express.js • PHP • Laravel • CodeIgniter • Python 𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲𝘀 • PostgreSQL • MongoDB • MySQL • Redis • Elasticsearch 𝗖𝗹𝗼𝘂𝗱 & 𝗗𝗲𝘃𝗢𝗽𝘀 • AWS • Azure • Google Cloud • Docker • Kubernetes • CI/CD Pipelines • Vercel • DigitalOcean Why clients hire me: ✔ Strong communication ✔ Product-first mindset ✔ Clean, scalable architecture ✔ AI + Full Stack expertise in one profile ✔ Startup-speed execution ✔ Long-term support and maintenance If you're looking for someone who can not only write code but also help shape product decisions, architect scalable systems, and integrate modern AI capabilities into your business, let's connect. I enjoy working on ambitious products and helping founders bring ideas to life.

I help startups and SaaS companies build AI-powered web applications, intelligent automation, and scalable full-stack products. I'm a Top Rated Full Stack Developer & LLM Engineer with 10+ years of experience (including 8+ years with React) specializing in React, Next.js, Node.js, Python, and modern AI technologies. I build production-ready applications that are fast, scalable, and designed for real business needs. My expertise includes: ✅ AI Chatbots & AI Agents ✅ OpenAI, Claude & Gemini Integration ✅ RAG Pipelines, LangChain & LlamaIndex ✅ React.js, Next.js & React Native ✅ Node.js, NestJS, Express & FastAPI ✅ GraphQL, PostgreSQL, MongoDB & MySQL ✅ AWS, Docker & CI/CD I've built SaaS platforms, AI-powered applications, mobile apps, customer portals, dashboards, workflow automation systems, and custom business software across healthcare, fintech, e-commerce, and service industries. I'm certified in AI Chatbots, RAG & Governance, Introduction to Large Language Models, and Master of Claude, allowing me to combine strong software engineering with modern AI capabilities. If you're looking for someone who can design, build, and deploy scalable AI-powered products—from MVPs to enterprise applications—I can help. Let's build something intelligent, scalable, and impactful together.

🚀 AI Engineer | Full-Stack Developer | LLM & RAG Specialist | Chatbots, Automation & Scalable Web/Mobile Apps Businesses that move fast on AI win. I help companies design and ship AI-powered products, intelligent assistants, and full-stack platforms from idea to production, without the back-and-forth. I'm a Full-Stack & AI Engineer with 10+ years building real systems. I combine LLMs, RAG pipelines, and modern web/mobile stacks to create software that actually works in the real world. ── AI & LLM Engineering ── • RAG systems, AI chatbots & knowledge assistants • LLM integration (GPT-4, Claude, Gemini) & prompt engineering • AI agents, document processing & workflow automation • Vector databases: Pinecone, Weaviate, FAISS ── Full-Stack Development ── • MERN stack (MongoDB, Express, React, Node.js) • REST & GraphQL APIs, microservices • PHP / Laravel — legacy systems & custom backends • SQL (PostgreSQL, MySQL) & NoSQL databases ── Mobile & Cloud ── • Cross-platform mobile apps (React Native / Flutter) • AWS, Docker, CI/CD, scalable cloud deployment ── Automation & Integrations ── • Python pipelines, FastAPI, Django • Make, Zapier, Stripe, Twilio, WhatsApp API ── What You Get ── ✔ Production-ready code, not prototypes ✔ Clear communication & zero hand-holding needed ✔ A senior engineer who owns the project end-to-end Let's build something great !!!

Mobile App Developer | Flutter Developer | React Native Developer | iOS & Android Apps | AI-Powered MVPs I am a Mobile App Developer with 12+ years of experience building high-quality mobile applications for startups, SaaS companies, enterprises, and growing businesses worldwide. As a Mobile App Developer, I have successfully delivered 500+ projects ranging from MVPs and startup products to large-scale applications used by thousands of users. My expertise includes Flutter, React Native, iOS, Android, Firebase, Node.js, AI integrations, and scalable cloud-based architectures. Whether you need a new mobile application, MVP development, app modernization, AI-powered features, or long-term product support, I can help turn your idea into a successful product. 🚀 What I Can Help You Build • Cross-platform mobile applications using Flutter and React Native • iOS and Android applications with native-like performance • SaaS platforms and subscription-based mobile products • AI-powered applications using OpenAI and Gemini • Marketplace and on-demand service apps • Healthcare, Fintech, E-commerce, Logistics, and Social Networking applications • MVPs for startups looking to launch quickly and validate ideas • Scalable backend systems using Firebase, Node.js, PostgreSQL, MongoDB, and AWS As a Mobile App Developer, I focus not only on writing clean code but also on creating products that are scalable, maintainable, and aligned with business goals. 🧠 AI-Powered Mobile Applications As an AI-focused Mobile App Developer, I help businesses integrate practical AI features that improve user experience and automate manual processes. Examples include: • OpenAI and Gemini integrations • AI chat assistants and customer support automation • Content generation and summarization • AI-powered recommendations and personalization • Workflow automation and intelligent business tools • AI agents for scheduling, data processing, and productivity I believe AI should solve real business problems and deliver measurable value rather than being added simply as a trend. 🛠 Technical Expertise Mobile Development: Flutter, React Native, Swift, Kotlin, Dart, JavaScript, TypeScript Backend & Cloud: Firebase, Node.js, AWS, PostgreSQL, MongoDB, REST APIs, GraphQL AI & Automation: OpenAI API, Gemini API, Vector Databases, AI Agents, Prompt Engineering Design & Product: Figma, Postman, Jira, Agile Development, Automated Testing 📈 Why Clients Work With Me ✔ 500+ Successfully Delivered Projects ✔ 12+ Years of Mobile Development Experience ✔ Flutter & React Native Specialist ✔ MVP to Enterprise-Level Product Development ✔ Strong Communication and Transparent Process ✔ Long-Term Product Support and Scaling Expertise As a Mobile App Developer, I understand that every project is different. Some clients need a fast MVP to validate an idea, while others need a reliable development partner to scale an existing product. My goal is to provide solutions that support your business objectives and help you grow. If you are looking for a Mobile App Developer who combines strong technical expertise, startup experience, and practical AI integration, I would be happy to discuss your project. 📩 Send me a message and let's discuss how we can bring your mobile app idea to life.

🌟 Transform Your Vision into Reality with a Trusted Tech Partner! 🌟 Hi there! I’m Ajay Kumar, a seasoned tech leader with 10+ years of expertise in Microsoft, Python, and Cloud technologies, leading a high-performing team that builds secure, scalable, and future-ready software solutions. Whether you’re building from scratch, modernizing legacy systems, or scaling cloud infrastructure — we make complexity feel simple. 🚀 What We Deliver 🔧 Full-Stack Development Expertise Backend Powerhouse: ✅ Microsoft Stack: ASP.NET MVC, .NET Core, REST APIs, JWT, Entity Framework, Microservices ✅ Python Stack: Django, FastAPI, Flask, Tornado, Bottle, Pyramid, Falcon, Eve — everything you need in Python development ✅ PHP Stack: Laravel, Core PHP, CodeIgniter ✅ AI/LLM Integration: Implement and fine-tune Large Language Models (LLMs) using OpenAI, HuggingFace, LangChain, RAG — for smart apps like: AI chatbots Document summarization Semantic search Recommendation systems Frontend Brilliance: ✅ Angular ✅ React.js ✅ Razor Pages ✅ HTML5/CSS3 ✅ JavaScript — responsive and modern UI/UX ☁️ Cloud & DevOps Mastery ✅ Azure: App Services, Functions, Blob Storage, Azure SQL, Azure AD, Azure DevOps ✅ AWS: Lambda, EC2, S3, RDS, API Gateway ✅ DevOps: CI/CD Pipelines, Docker, Kubernetes, Terraform, GitHub Actions, GitLab CI ✅ Cloud-Native Deployments: Secure and cost-efficient infrastructure 🔐 Secure, Scalable Data & Auth Systems ✅ Databases: SQL Server, PostgreSQL, MySQL — optimized for performance & scalability ✅ Authentication: JWT, OAuth2, Azure AD, Identity Server ✅ Version Control: Git, GitHub, GitLab, GitExtensions 🏭 Industries We Empower We serve FinTech, Healthcare, eCommerce, Logistics, EdTech, Real Estate, and 15+ other industries — delivering domain-aligned tech solutions with precision. 💡 Why Partner With Us? ✅ End-to-End Product Ownership — from UI to DevOps ✅ Microservices-Driven Architecture — effortless scalability ✅ Security-First Mindset — best practices & compliance (GDPR, HIPAA, etc.) ✅ Transparent Agile Development — sprint planning, daily standups, and demos ✅ Fast LLM Integration — build AI-powered features in days ✅ Full Python Stack coverage — Django, FastAPI, Flask, Tornado, Bottle, Falcon, Eve & more 🕒 Availability & Reliability ✅ 24/7 Support & Monitoring ✅ Flexible Engagement Models (Dedicated, Hourly, Fixed) ✅ Rapid Onboarding & Transparent Communication 🔖 #TechPartner #AzureDeveloper #AngularDeveloper #FullStackDevelopment #CloudSolutions #DevOps #PythonDevelopment #MicrosoftTechnologies #FastAPI #Django #Flask #LLMIntegration #Microservices #ASPNetCore #ReactJS #DatabaseManagement #CyberSecurity #AgileDevelopment #DigitalTransformation #eCommerce #Healthcare #FinTech #Logistics #PythonFullStack

Among top 1 percent API Integration & Automation Expert in the World Are you looking for a top-rated API Integration Expert who can seamlessly connect your applications, CRMs, eCommerce platforms, and custom software—while automating workflows to save you time, money, and effort? You’re in the right place! ✅ I am a Software Engineer & API Integration Automation Specialist with 15+ years of experience delivering 100% successful integrations for clients worldwide. My expertise lies in REST, SOAP, and GraphQL APIs, along with automation frameworks that streamline complex business operations What is an API Integration & Automation Expert? ✔️An API integration automation expert specializes in connecting multiple systems through APIs and ensuring the process is smooth, automated, and scalable. Instead of manual data entry or disconnected tools, I build smart workflows using: ✔️API-first automation ✔️CI/CD pipelines for integrations ✔️Cloud tools (Jenkins, Docker, Kubernetes) ✔️Error handling & monitoring ✔️This means your business runs faster, smarter, and error-free. My Technical Expertise ✔️ Languages & Frameworks: PHP, Laravel, JavaScript, Vue.js, WordPress, Shopify, Custom CMS ✔️ API Types: REST, SOAP, GraphQL ✔️ Automation Tools: Jenkins, Docker, Kubernetes, Zapier, Integromat/Make ✔️ CRM Integrations: Zoho CRM, Infusionsoft, HubSpot, Pipedrive, Salesforce, Freshsales ✔️ eCommerce & ERP Integrations: Shopify, WooCommerce, TradeGecko, Linnworks, Amazon, eBay ✔️ Communication & Marketing APIs: Twilio, Klaviyo, Mailchimp, SMM APIs ✔️ Payment Gateways: Stripe, PayPal, GoCardless, BNCES ✔️ Logistics & Shipping APIs: UPS, Easypost, ShipStation, NP Fulfilment, ChinaBrands ✔️ Other Niche APIs: Trello, Etsy, SimRacingApps, Mindbody, OrderDesk, BeautyFort, Knack, Gadventures I’ve successfully integrated 500+ APIs across industries like eCommerce, Healthcare, Finance, Travel, Real Estate, and SaaS. What I Deliver ✅ Custom API integration (from scratch or into existing platforms) ✅ Automation pipelines for real-time syncing & workflows ✅ Data migration & synchronization between platforms ✅ API error handling, testing & debugging ✅ Ongoing support & maintenance Why Clients Choose Me Proven Success: 100+ successful API integrations Industry Experience: From startups to enterprise systems Client Satisfaction: 5★ feedback & repeat clients Fast & Affordable: Delivering quality without wasting time or money Let’s Work Together If you’re looking for the #1 API Integration & Automation Expert in the World who can design, implement, and automate APIs to optimize your business, let’s connect! Send me a message, and I’ll be happy to discuss your project in detail.

Full Stack Developer | SaaS & MVP specialist. Backed by 20+ years building scalable web apps with React, Node.js & .NET for startups and product companies. I work with founders and product teams from day one – helping them validate ideas, build MVPs, and scale into production-ready platforms. My focus is not just clean code, but business outcomes: faster time-to-market, stable architecture that scales, and features that users actually need. Behind every engagement is a 330+ engineer team covering full-cycle product development – frontend, backend, cloud, DevOps, QA, and AI integration – so you never hit a skills gap mid-project. 💡 Case Studies 🚛 MyCarrierTMS (Logistics SaaS, USA) – Built a transportation management platform from MVP to enterprise-grade product. Delivered real-time rate comparison, automated shipment tracking, and third-party API integrations (project44, Stripe, Recurly). Team scaled from 5 to 25 engineers as the product grew. Stack: Angular · .NET · TypeScript · Azure · MongoDB Result: 99.97% availability · $36.8M total funding · FreightWaves FreightTech 25 Award · #1-rated TMS on G2. ⚖️ Denbeaux (LegalTech, USA) – Built a web platform that fully automated fraud case outreach for a US-based law firm. Replaced a manual Excel-based workflow: the system now retrieves legal case data, enriches it, generates personalized PDF letters, and dispatches physical mail – all automatically. Stack: .NET 8 · Angular 16 · AWS · PostalMethods API Result: 800x time savings – from 69 hours of manual work to 5 minutes · seamless expansion to new case types without additional development. 💰 LimpidMarkets (FinTech, London/Zurich OTC) – Took over and scaled a real-time precious metals exchange platform for interbank markets. Delivered real-time price synchronization, customized order visibility, and banking API integrations while maintaining compliance with finance industry regulations. Stack: React · Redux · Node.js · Elixir · Symfony · AWS Result: 40% client business growth · 24/7 availability across all time zones · user base includes Deutsche Bank, Citibank, Morgan Stanley, BNP Paribas. 🏥 Flexwise Health (HealthTech SaaS, USA) – Evolved an on-demand hiring platform for nurses into a full clinic staff management system. Refactored monolith into microservices, integrated AI-powered workload prediction, and ensured seamless EMR system integrations. Stack: React · TypeScript · Node.js · Nest.js · MongoDB · AWS Lambda Result: $6M in funding raised · acquired by Aya Healthcare · increased platform stability and scalability throughout rapid growth. 🌐 Frontend React · Redux · Angular · TypeScript · Next.js · Vue.js ⌨️ Backend Node.js · Nest.js · .NET · Symfony · Elixir · REST & GraphQL APIs 🗄️ Databases MongoDB · PostgreSQL · MySQL · Azure SQL · Redis · Elasticsearch ☁️ Cloud & Infrastructure AWS (Lambda, EKS, RDS, S3, CloudFront) · Azure · Docker · Kubernetes 🤖 AI Integration OpenAI API · ChatGPT integration · AI-powered workflow automation LLM-based data processing · AI workload prediction · Intelligent automation 💳 Third-Party & Payments Stripe · Recurly · project44 · Banking APIs · PostalMethods EMR/EHR systems · Custom REST API development Why teams choose us: ✅ Full product lifecycle – from discovery and architecture to deployment and long-term maintenance ✅ 330+ engineers across frontend, backend, DevOps, QA, and AI – no skills gaps mid-project ✅ 2,250+ delivered projects across FinTech, HealthTech, LegalTech, Logistics, and B2B SaaS ✅ We've supported products through multiple funding rounds – we know what investor-ready architecture looks like ✅ GDPR-compliant development · EMR/EHR integration experience · finance industry compliance Ready to build your SaaS product or scale an existing platform? Send me a message – I'll respond within a few hours with a clear assessment and a proposed first step. [Updated: April 2026]

I help founders and product teams ship and stabilize production systems across mobile + backend—especially when reliability, security, payments, and “edge cases in the real world” matter. I’m a former Capital One Staff Engineer (Payments) and have delivered work for organizations including the Library of Congress. I’m comfortable operating in production safely, debugging messy systems, and modernizing workflows without rewriting everything. Recent and notable work • CakeClub (iOS + Firebase): Turnaround to production-ready. Built a Firebase Cloud Functions v2 backend for budget calculations and transaction sync, secured Plaid token storage with encryption keys protected in Google Secret Manager, implemented Firebase App Check, integrated RevenueCat, added Crashlytics/Analytics, and created an admin panel with role-based access. Established QA + Production environments and CI (Xcode Cloud + GitHub Actions). • Genie AI: Contributed to shipping and stabilizing production workflows under real constraints, focusing on reliability and execution. What clients hire me for • Production stability: crashes, retries/double submits, inconsistent state, payments/webhooks • Shipping and launch closeout: TestFlight/internal testing → App Store / Play Store • Mobile + backend alignment: when client behavior and backend reliability interact under poor networks If you want a senior engineer who communicates clearly, works independently, and delivers production-safe improvements, I’m a good fit.

🌟 Top Rated on Upwork 🏅 100% Job Success on Upwork 🏆 8 years experience in Mobile & Web Development I am an experienced mobile and web app developer with strong knowledge of iPhone-Android AI-powered solutions (Objective C, Swift, SwiftUI, iOS SDK, Java, Kotlin, Android, React Native) I am expert in the backend like (AWS, Azure), Firebase, web service and restful web service, AWS s3, AWS EC2 setup, RDS Mobile App Development =================== SwiftUI, Kotlin, Java, Dart Front-End Development =================== React.js , JavaScript, TypeScript, HTML5, CSS3 Redux, React Hooks, Redux-Saga, Flux Tailwind CSS, Material-UI, React Bootstrap, Styled Components Back-End Development =================== Python (Django, Flask, FastAPI), Node.js Express, Nest.js AI Integration: OpenAI, AI Agents, Chatbots, LLM-based apps RESTful APIs, WebSockets, real-time communication Secure authentication, complex business logic, scalable architecture Third party Integrations =================== Integrations & APIs Stripe
Twilio
Google Maps
SendGrid AI & Automation ============= AI Chatbots, AI Agents, LLM Integrations (OpenAI, GPT) Conversational AI, prompt engineering, workflow automation AI-powered SaaS tools, assistants, and business automation systems API integrations for AI-based features in web & mobile apps 
Debugging & Testing: ================ Xcode, Android Studio, TestFlight, Firebase Crashlytics Web and Mobile App UI/UX Design: ============================ Figma, Adobe XD, Sketch, Photoshop Industries I have worked with: ============================ - AI-powered Applications & Automation Tools - E-commerce & Marketplaces - Healthcare & Fitness Apps - Financial & Blockchain Apps - Social Media & Event Platforms - Geo-location & Location-based Services - Live Media Streaming & Instant Messaging - Wearable Tech & Custom Apps - Stripe Integration & Payment Gateways Additional ======= - Rork - Cursor AI - Claude AI - Lovable.dev - Git - Svn - Bitbucket - TestFlight - Firebase Crashlytics I will follow an agile methodology and I will do weekly scrum meeting as well as daily updates Project Managment tools ===================== - Asana - Trello - Jira - Clickup Looking forward to working with you Rajal

⭐ Top Rated WordPress Developer, Designer and Expertise in Core PHP, Laravel Framework ⭐ Cost-Efficient Services ⭐ Fluent English Verified ⭐ 8+ Years Of Experience ⭐ Long term working relationship Helping to build the future of web applications with 8+ years of experience in full-stack development. I am a Full Stack Developer with experience in Laravel, CodeIgniter, WordPress, Shopify, Prestashop, Wix, ReactJS, HTML5/CSS3, JavaScript, and AJAX. I have the desire to work on a variety of projects, including Front-End development and Back-end development. I have achieved a vast amount of experience over the years in web development, which has included a wide variety of tasks: from real-time web apps to content management systems to E-commerce and custom websites. I have also worked on projects that require React.js development. Expertise Area: ✅ Frontend: WordPress, speed optimization, Bootstrap, JavaScript, jQuery, Ajax, HTML5 ✅ Backend: PHP, Laravel, CakePHP, WordPress, RESTful API ✅ Database: MongoDB, PostgreSQL, MySQL. Skills: ✅ Core PHP ✅ WordPress development and seo ✅ Web Development ✅ CodeIgniter, Shopify, Prestashop, Wix,squarespace ✅ API Integration ✅ Payment Gateway Integration ✅ Excellent practice at building large scale web applications. ✅ Experience building highly interactive and responsive sites design. ✅ Bonus: Ability to quickly learn new languages & technologies Thanks a lot for visiting my profile, You are invited to watch my portfolios. Please see this at a glance. Enjoy your moments have a good time!