Hire the Best Sabre Developers in Karachi, PK

🌟 Top Rated Plus Freelancer | Full-Stack Developer | Web & Mobile App Expert 🌟 Greetings! I'm Usama, a seasoned programmer specializing in web and mobile app development for Android and iOS platforms, along with expertise in Windows services and desktop utilities. With a strong background in C#.NET, ASP.NET MVC,.NET Core, Xamarin, Blazor, and.NET MAUI, I bring over 6 years of hands-on experience to the table. My expertise includes: Developing responsive web applications with Blazor and ASP.NET for a modern user experience. Creating cross-platform mobile applications using Xamarin,.NET MAUI for Android and iOS, and ASP.NET Core Web API. Designing and implementing Windows services for background tasks and automation. Developing desktop utilities using WinForm C# for various purposes such as data management, reporting, and more. Efficiently managing databases with Microsoft SQL Server and MySQL for seamless data handling. Here's why clients love working with me: a proven track record of delivering high-quality solutions on time. Expertise in OOP, MVC, API integration, and responsive design for web and mobile applications. Fluent in English, Urdu, and Hindi for seamless communication. Let's collaborate to bring your ideas to life and achieve success together. Feel free to explore my profile and check out feedback from satisfied clients. I look forward to the opportunity to work with you! Warm regards, Usama

Hi, I help founders, startups, and growing businesses build products, automate operations, and leverage AI to create scalable competitive advantages. With 10+ years of experience in Full Stack Development, Product Engineering, and AI Automation, I have helped companies launch MVPs, streamline workflows, and develop AI-powered solutions that improve efficiency, reduce costs, and accelerate growth. My approach goes beyond development—I focus on building systems that solve real business problems and generate measurable results. ✅Expertise ✔️AI Agents & Agentic Workflows ✔️AI Copilots & Business Automation ✔️MCP (Model Context Protocol) Integrations ✔️RAG Systems & Knowledge Assistants ✔️Custom LLM Applications ✔️AI-Powered SaaS Development ✔️MVPs & Rapid Product Launches ✔️Workflow Orchestration & Process Automation ✔️Internal Tools & Operations Platforms ✔️CRM, ERP & Third-Party API Integrations ✔️Full-Stack Web & Mobile Applications ✔️Cloud Architecture, DevOps & Scalable Infrastructure ✅Technologies ✔️React ✔️Next.js ✔️TypeScript ✔️Node.js ✔️Python ✔️FastAPI ✔️React Native ✔️OpenAI ✔️Claude, LangChain ✔️n8n ✔️Make ✔️PostgreSQL ✔️MongoDB ✔️Redis ✔️AWS ✔️Docker ✔️CI/CD ✔️Stripe ✔️Shopify ✔️Modern AI infrastructure. ✅What You Can Expect ✔️ Clear communication and strategic thinking ✔️ Clean, scalable, production-ready solutions ✔️ Fast execution without sacrificing quality ✔️ Business-focused AI implementation ✔️ Long-term technical partnership and support Whether you need an MVP, an AI-powered product, intelligent automation, or a scalable SaaS platform, I can help turn your vision into a solution that delivers real business value. Let's build something that creates leverage, not just software

Senior Full Stack Architect | .NET 8 & Next.js | SaaS, AI & Stripe Billing Architecting enterprise-grade, high-performance web applications and SaaS platforms. With over 7 years of full-stack engineering experience, I specialize in migrating legacy systems to modern frameworks and building secure, multi-currency architectures. HOW I DELIVER VALUE (PROVEN DEPLOYMENTS) I do not just write code; I design scalable systems. I strictly enforce the separation of business logic from the presentation layer to ensure long-term maintainability. ▪ Global B2B eCommerce & Analytics Architected a custom CMS and pricing engine supporting 27 languages. Enabled dynamic multi-currency conversions and global routing using .NET Core and Next.js. ▪ Enterprise Automation & Regression Testing Engineered a comprehensive automation testing solution, migrating legacy QA tools to .NET 8. Integrated physical device testing pipelines using HeadSpin and Selenium to drastically reduce deployment cycles. ▪ AI Proxy & Trade Quoting Architecture Developed the backend infrastructure for an AI-driven contractor application. Integrated Supabase, Twilio, and complex Stripe Connect payment gateways for seamless multi-party transactions. ▪ Social Intelligence & Observability Dashboards Built scalable review aggregation platforms integrating custom data scraping. Implemented OpenTelemetry instrumentation for deep backend monitoring, distributed tracing, and metric sampling. CORE TECHNICAL SCHEMA ► Enterprise Backend: .NET 8, C#, ASP.NET Web API, RESTful Architecture ► High-Performance Frontend: React, Next.js (App Router), TypeScript, WCAG Accessibility ► Cloud & Infrastructure: Azure App Services, Azure DevOps, CI/CD pipelines, Docker, opentelemetry/Otel, Datadog, Signoz ► Databases: SQL Server (Performance Tuning, Stored Procedures), EF Core ► AI & Integrations: Local AI Model Orchestration (DeepSeek, Qwen), Stripe Webhooks, OAuth2 If your project requires robust full-stack architecture built for scale, click "Invite to Job" to discuss your roadmap.

🧩 About Me I’m a Full Stack .NET Developer and QuickBooks Integration Expert with extensive experience in building robust, high-performance web and desktop applications. I specialize in C#, .NET Core, ASP.NET MVC, and JavaScript frameworks (React, jQuery), combined with deep expertise in QuickBooks Desktop, Online, and POS integrations. ⚙️ What I Offer ✅ QuickBooks Integration & Custom Solutions 🔹Integrations with QuickBooks Desktop, Online, and POS (all versions) 🔹Sync external data sources with QuickBooks (databases, web apps, CRMs, etc.) 🔹Develop custom QuickBooks add-ins and utilities 🔹Web Connector, SDK, and REST API-based integrations 🔹Automated data import/export, invoice sync, and inventory management 🔹Integrations with SharePoint, Google Sheets APIs, Wix, Shopify, Salesforce, WooCommerce, and other third-party systems ✅ .NET Full Stack Development 🔹Web applications using ASP.NET MVC / .NET Core (6, 7, 8, 9) 🔹Backend services and RESTful APIs 🔹Database design and optimization (MS SQL, T-SQL, Dapper, Entity Framework) 🔹Responsive UI using HTML5, CSS, JavaScript, React, jQuery 🔹WinForms and WPF for desktop applications 🔹Integration with third-party APIs and payment gateways ✅ Other Services 🔹System analysis and architecture design 🔹Debugging, testing, and optimization 🔹Technical consulting for scalable software solutions 🧠 Skills Summary ✅ Languages & Frameworks: 🔹C#, 🔹VB.NET 🔹.NET Core, 🔹ASP.NET MVC 🔹Entity Framework 🔹 LINQ ✅ Frontend: 🔹React 🔹jQuery 🔹HTML5, 🔹CSS, 🔹JavaScript ✅ Database: 🔹SQL 🔹Server 🔹SQLite 🔹MySQL 🔹PostgreSQL ✅ QuickBooks: 🔹Desktop (SDK) 🔹Online (API) 🔹POS 🔹Web Connector ✅ Integrations: 🔹SharePoint 🔹Google Sheets 🔹Wix 🔹Shopify 🔹Salesforce 🔹WooCommerce 🔹Payment Gateways Integrations ✅ Other: 🔹REST APIs 🔹WinForms 🔹WPF 💡 Why Choose Me I take pride in delivering clean, maintainable, and performance-driven code. My goal is to help businesses integrate QuickBooks seamlessly or build full-stack .NET applications that solve real-world business problems. If you’re looking for a reliable and detail-oriented developer who understands both QuickBooks ecosystems and enterprise-level .NET development, let’s connect and bring your project to life.

🚀 You bring the idea. I'll handle everything — design to deployment — and deliver a production-ready Next.js app you're proud to show off. I'm a Next.js & React Developer with 4+ years of experience crafting fast, scalable SaaS applications for startups and growing businesses — from clean landing pages to full-stack products with auth, payments, and AI integrations. Most recently I built RepurposeAI — a live SaaS that uses OpenAI to convert blog posts into Twitter threads, LinkedIn posts & email newsletters. Built with Next.js, Supabase, Typescript, Stripe & Tailwind CSS. 💼 What I Build For You ✔ Full-stack Next.js & React SaaS applications ✔ AI-powered features (chatbots, content pipelines, document processing) ✔ Figma / Adobe XD → pixel-perfect, production-ready Next.js ✔ SaaS dashboards & admin panels ✔ Authentication systems (Clerk, NextAuth, PropelAuth, Auth0) ✔ Stripe payment integration (one-time, subscriptions, webhooks) ✔ Next.js SEO optimization & Core Web Vitals ✔ Performance fixes, refactoring & code cleanup ✔ Deployment & hosting setup ⚡ What You Actually Get - A complete, working product — not just a UI file - Mobile-responsive across all screen sizes and devices - Clean, scalable code you can maintain and build on - One developer handling design, code, integrations & deployment - Clear communication with regular updates throughout ⚡ Results I Deliver ⚫ Shipped full-stack SaaS products from 0→1 with auth, payments & AI pipelines ⚫ Built SEO-friendly Next.js apps that rank and convert 🛠 Core Stack Frontend: Next.js, React, React Native Expo, TypeScript, JavaScript, Redux, Zustand, React Query UI: Tailwind CSS, ShadCN UI, Material UI, Custom CSS Backend: Node.js, Express, MongoDB, PostgreSQL, Supabase AI: OpenAI API, Anthropic API, Prompt engineering Auth: Clerk, NextAuth, PropelAuth, Auth0 Tools: Git, Figma, Netlify, Vercel, Stripe, Chart.js, Framer Motion, React Hook Form, Zod 🤝 Why Clients Choose Me ✔ 4+ years specializing in Next.js & React development ✔ Full-stack capability — from UI to database to deployment ✔ AI integration experience with real shipped products ✔ Strong design sense for clean, modern UI ✔ Clear communication & daily updates ✔ On-time delivery with scalable, maintainable code ✔ 100% Job Success Score with consistent 5-star client feedback 📩 Have an idea for a SaaS or web app? Send me a message — I'll help turn it into a production-ready product.

Experienced Senior Software Engineer with a strong track record in delivering high-quality software solutions. Adept at leading and mentoring teams, managing project schedules, and staying updated on industry trends. Recognized for consistently exceeding customer expectations and enhancing client satisfaction. Skilled in diverse technologies, including C#, .NET Core, JavaScript, Angular, React and databases like MSSQL, MySQL and MongoDb. Ready to contribute Development expertise to drive success in forward-thinking organizations.