Hire the Best PayPal API Developers in Karachi, PK

Full Stack .NET Developer | SaaS, ERP, AI & Automation Specialist | API Integrations Expert Are you looking for a senior Full Stack Developer who can architect, build, and scale powerful SaaS platforms, ERP systems, AI-powered tools, and complex integrations using .NET Core and modern frontend frameworks? With 8+ years of hands-on experience, I help startups and businesses turn ideas into secure, scalable, and production-ready applications. What I Specialize In ✔ SaaS Application Development (Multi-Tenant, Subscription Systems) ✔ ERP & Business Management Systems ✔ AI-Integrated Applications & Smart Automation ✔ API Design & Third-Party Integrations ✔ Payment Gateway Integrations (Stripe, PayPal, NMI, Authorize .net, Clear) ✔ Communication Integrations (Twilio, Email, SMS Automation) ✔ Fraud & Risk Tools (Kount, SEON) ✔ Real-Time Systems & Dashboards ✔ Workflow Automation & Backend Architecture ***Tech Stack Expertise*** **Backend** .NET / .NET Core / ASP .NET Core REST APIs & Microservices Entity Framework SQL Server / Database Optimization Authentication & Security Best Practices **Frontend** Angular, React, HTML/CSS Responsive UI / Admin Dashboards Integrations & Tools Stripe, PayPal, NMI, Authorize .net DocuSign API Twilio (SMS / Voice / OTP) Fraud Detection APIs (Kount, SEON, Clear, OnFido, ID Analyzer) Third Party API's (Google, Facebook Graph API, AppStore, Google) Azure(App Services, Azure Functions, Key Vault, Blob Storage, Azure SQL Server, Azure CosmosDB) Plaid-style financial flows Automation & Background Services **Industries I’ve Built Solutions For** Healthcare Systems Fintech Platforms Real Estate Portals eCommerce & Payments Logistics & Rental Platforms Business Automation Tools **What You Can Expect Working With Me** ✔ Architect-level thinking, not just development ✔ Clean, scalable and maintainable code ✔ Business-focused solutions (performance + growth ready) ✔ Strong communication & reliability ✔ Able to handle full lifecycle: planning → development → deployment I’m comfortable working both long-term with growing teams and on focused high-impact projects.

If you're building a serious product and need someone who can handle backend complexity while keeping the frontend smooth and responsive, you're in the right place. Full-Stack Developer with 8+ years of experience working with Laravel, Node.js, React, and Vue, focused on building robust backend systems, real-time applications, and reliable integrations. The goal is simple: 👉 build systems that perform in production — not just in development 💡 What you can expect ⚡ Stable backend systems built for real-world usage 🔌 APIs that integrate cleanly with external services 💳 Secure and predictable payment flows 📊 Fast, structured dashboards with real-time insights ⚛️ Smooth frontend experiences powered by solid backend logic 🧱 Core Expertise 🧠 Backend Architecture (Primary Focus) Laravel & Node.js systems with RBAC, queues, event-driven design, and modular structure 🔗 API Development & Integrations REST APIs, third-party integrations (Stripe, PayPal, Twilio, OpenAI, ElevenLabs, 2Checkout) 💳 Payment Systems Subscriptions, billing flows, webhook handling, retries, and failure management 📡 Real-Time Systems WebSockets, event broadcasting, notifications, chat, and live updates ⚛️ Frontend Integration (Support Layer) React, Vue, Next.js — clean UI connected to scalable backend systems 🚀 Selected Work 🧠 Built a personalized learning platform — dynamically adapts content based on user behavior, progress, and performance insights 🌍 Developed a smart travel planner — generates itineraries, budgets, and recommendations using user preferences + live data 🎮 Engineered a multiplayer browser game system — real-time interactions, leaderboards, and in-game economy logic 📦 Designed a logistics optimization engine — calculates delivery routes using predictive analysis and cost-efficiency models 💬 Built a real-time communication system — chat, voice, and notifications powered by event-driven architecture (Twilio integration) 🛍️ Developed a social commerce platform — community-driven product discovery, reviews, and purchase flows 📚 Created a knowledge management system — structured company data with AI-powered search and summarization 🧾 Built a contract lifecycle system — approvals, compliance tracking, and automated reminders 🎧 Designed an audio streaming platform — personalized recommendations, playlists, and creator monetization 🧪 Developed an experiment tracking system — A/B testing workflows with analytics and performance insights ✅ How work is handled 🗺️ Clear technical planning before development starts 🔄 Consistent updates and transparent communication 🧾 Clean, maintainable, production-grade code 🚢 Systems built for smooth deployment and long-term stability P.S: Systems that are designed properly don’t need constant fixing later.

I am a Senior Software Engineer, Solutions Architect, and Technical Consultant with 15+ years of experience in web and software development. Throughout my career, I have built over 500 websites and applications across a wide range of platforms, frameworks, and technologies. Expertise: - Web & Software Development: PHP, MERN Stack (MongoDB, Express.js, React.js, Node.js), ASP.Net, Classical ASP, JavaScript, VBScript, jQuery, jQuery Mobile, Ajax, XML, MVC. - Frameworks & CMS: Laravel, Yii, CodeIgniter, CakePHP, Shopware, Magento, Opencart, OsCommerce, ZenCart, Prestashop, Virtuemart, Joomla, PhpBB, WordPress, DropInn (Airbnb Clone), SocialEngine, DotNetNuke. - AI & Machine Learning: TensorFlow, SciKit Learn, OpenCV, PyTorch, AI-driven applications, Large Language Models (LLMs), Semantic Search, RAG, Vector Databases. - Blockchain & FinTech: Smart Contracts, Ethereum, Solidity, Web3.js, Crypto Payment Gateways, Decentralized Applications (DApps). - APIs & Integrations: SalesForce API, PayPal API, Authorize.Net API, Stripe, REST & GraphQL APIs. Other Technologies: C/C++, VC++, C#, Objective C, DirectX, OpenGL, Assembly, Cordova/PhoneGap. Education: BS (Computer Science) – University of Karachi I specialize in architecting scalable solutions, optimizing performance, and integrating advanced AI & blockchain technologies into modern applications. Let’s connect to discuss how I can contribute to your project!

I specialize in building custom, scalable, and high-performance web applications using modern technologies such as Node.js, Next.js, React.js, NestJS, and Express. With strong expertise in both frontend and backend development, I create seamless, efficient, and user-friendly solutions tailored to your business needs. From dynamic startups to enterprise-level systems, I have successfully delivered a wide range of projects, ensuring reliability, security, and performance at every stage. My experience with databases like MongoDB, MySQL, and PostgreSQL allows me to design optimized data architectures that support long-term growth. What I offer: Custom web application development (full-stack) RESTful API & backend development Server-side rendering (Next.js) applications Scalable architecture using Node.js & NestJS Database design & optimization (SQL & NoSQL) Responsive, modern UI with React.js Performance optimization & clean code practices I follow industry best practices and focus on writing clean, maintainable, and efficient code. My attention to detail and problem-solving approach help identify challenges early and deliver smooth, bug-free applications. I believe in clear communication and close collaboration with clients to ensure every project is delivered on time and exceeds expectations.

🚀 PHP Laravel Developer | API Integrations | Stripe | MySQL Optimization Need a PHP developer who can build APIs, integrate third-party services, optimize databases, or maintain and scale your existing application? I help startups and businesses develop secure, scalable, and high-performance web applications using PHP, Laravel, MySQL, React.js, and Next.js. Over the years, I have worked on eCommerce platforms, LMS systems, ERP solutions, subscription-based products, payment gateways, reporting systems, and enterprise applications. What I Can Help You With: ✅ PHP (Core PHP) Development ✅ Laravel Application Development ✅ REST API Development & Integration ✅ SOAP API Integration ✅ Third-Party API Integrations ✅ Stripe, PayPal & Payment Gateway Integration ✅ Authentication & Authorization Systems ✅ MySQL & SQL Server Database Design ✅ Query Optimization & Stored Procedures ✅ SaaS & Subscription-Based Platforms ✅ Admin Panels & Business Automation Systems ✅ React.js & Next.js Frontend Development ✅ Bug Fixing & Performance Optimization Technologies: • PHP, Laravel • MySQL, SQL Server, PostgreSQL • JavaScript, React.js, Next.js • Node.js • Stripe, PayPal • OAuth, JWT Authentication • AWS, Linux, Docker • Git, CI/CD Recent Project Experience: ✔ Built and maintained enterprise LMS and ERP systems ✔ Integrated Stripe Tax, Apple Wallet, and Google Wallet ✔ Developed REST and SOAP APIs for external services ✔ Optimized complex SQL Server stored procedures and database performance ✔ Built subscription and membership management systems ✔ Developed reporting dashboards and business automation tools ✔ Maintained and enhanced eCommerce platforms Why Clients Work With Me: ✔ Clean and maintainable code ✔ Fast communication ✔ On-time delivery ✔ Strong problem-solving skills ✔ Long-term support and maintenance If you're looking for a developer who can quickly understand your requirements, write quality code, and deliver reliable solutions, feel free to send me a message. I'd be happy to discuss your project.

Full Stack Developer & UI/UX Designer 10+ years building Laravel, PHP, React.js, Node.js & WordPress solutions for businesses worldwide. 100% Job Success Score. ⚡ WHAT I DELIVER • Laravel & PHP web applications — secure, scalable, production-ready backends • React.js & Node.js full-stack apps — fast, API-driven, modern architecture • WordPress & WooCommerce stores — custom themes, plugins, payment integrations • Shopify store development & customization • REST API development & third-party integrations (Stripe, PayPal, Google APIs, CRMs) • UI/UX design in Figma — wireframes, prototypes, mobile-responsive interfaces • CRM systems, LMS platforms, SaaS applications, custom CMS solutions ⭐ WHAT CLIENTS SAY (100% Job Success · 5.0 Rating) "This developer has all the right skills — very passionate about his client's success." "Highly skilled, extremely responsive, communicates clearly, and truly understands the requirements." 🔧 TECH STACK Laravel · PHP · React.js · Node.js · Vue.js · WordPress · WooCommerce · Shopify · MySQL · MongoDB · REST API · JavaScript · TypeScript · Figma · UI/UX Design · Web Application Development · SaaS Development · Payment Gateway Integration · API Integration ✅ WHY CHOOSE ME • 100% Job Success Score — every project delivered with accountability • Clean, well-documented, maintainable code • Fast, responsive, SEO-friendly builds • Reliable communication — clear updates throughout • End-to-end ownership: concept → design → development → launch 📩 Message me to discuss your project — I respond within a few hours.