Hire the Best Google App Engine Developers in Karachi, PK

I help startups and businesses turn their ideas into clean, functional, and scalable mobile apps using SwiftUI for native iOS and FlutterFlow for fast, cross-platform builds, with AI features integrated where it adds real value. I'm steadily growing on Upwork and focused on building long-term client relationships through quality work, clear communication, and on-time delivery. ━━━━━━━━━━━━━━━━━━ How Your Project Moves From Idea to Live App Every project follows a clear, organized process: Requirement Discussion → UI/UX Design → Development → Testing → Deployment → Support This keeps things transparent and easy to track from day one. ━━━━━━━━━━━━━━━━━━ FREE 30-MINUTE CONSULTATION Before we start, I offer a free consultation to: ✔ Understand your idea and goals ✔ Recommend the right tech approach (SwiftUI vs FlutterFlow) ✔ Discuss timeline and cost estimate ✔ Flag any potential issues early on ━━━━━━━━━━━━━━━━━━ What I Work On ✅ Native iOS apps (SwiftUI) ✅ Cross-platform apps (FlutterFlow) ✅ AI-powered mobile apps (AI chat, automation features) ✅ MVPs for startups ✅ App UI/UX design and rebuilds ✅ Firebase-backed apps (auth, real-time data, notifications) ✅ API integrations (third-party & AI APIs) ✅ Food delivery apps ✅ Ride booking apps (Uber-like) ✅ Real estate apps ✅ Social media apps ✅ SaaS platforms ✅ Healthcare & fitness apps ✅ E-commerce platforms ✅ Learning management systems ✅ Booking & appointment apps ✅ On-demand service apps ✅ CRM & business management systems ✅ Custom enterprise applications ━━━━━━━━━━━━━━━━━━ TECH STACK Mobile: SwiftUI, iOS, FlutterFlow, Flutter, React Native Backend: Firebase, REST APIs AI: OpenAI API, AI Chatbots, AI Automation ━━━━━━━━━━━━━━━━━━ WHAT I BRING BEYOND DEVELOPMENT → Honest technical advice (I'll tell you if an idea needs adjusting) → Clean, maintainable code → Regular updates throughout the project → Post-launch bug fixes and support → Realistic timelines — no overpromising ━━━━━━━━━━━━━━━━━━ If you're looking for a developer who's detail-oriented, communicates clearly, and genuinely cares about getting your app right let's talk. Expertise & Specialization SwiftUI / Native iOS Development FlutterFlow Development iOS & Android App Development AI-Powered Mobile Applications Full Stack App Development Cross-Platform Mobile Apps SaaS & Startup MVP Development Custom Mobile Application Development AI Chatbot & Automation Solutions Backend APIs & Cloud Infrastructure Firebase & Real-Time Applications Scalable Mobile App Architecture App Store & Play Store Deployment User Authentication & Payment Integration Third-Party API Integration In-App Purchases & Subscription Systems Mobile UI/UX Optimization AWS & Cloud-Based Solutions Mobile App Consultation & Technical Strategy Product Architecture & Scalability Planning Technologies SwiftUI • Swift • FlutterFlow • Flutter • Firebase • REST APIs • OpenAI API • iOS • Android • AWS

A wedding-planning app spending $100K+/month on ads asked for a routine AppsFlyer audit. Nothing looked broken. Turned out SKAN 4.0 wasn't misconfigured, it was completely dead. And their 100% ATT consent rate wasn't real: the SDK only started counting users after they accepted tracking, so everyone who said no just vanished from the data. Once that got fixed, real consent came in at 26%. Same spend, same campaigns, same time period, but cost per conversion was 41% lower than what the dashboard had shown for months. The campaigns weren't underperforming. The measurement was lying to them. Bugs like that survive audits because they never throw an error. The dashboard just reports a number that happens to be wrong, and nobody questions a number that looks normal. Catching it takes someone comfortable on both sides: I can sit with your dev team to fix the SDK logic, and sit with your growth team to explain what the corrected numbers mean for the next budget call. This combination is rarer to find WHAT I HANDLE - AppsFlyer & MMP Setup. SDK implementation for iOS and Android, SKAN 4.0 conversion value schemas, SSOT configuration. Also work with Singular and Tenjin. - Attribution Audits. Finding out why AppsFlyer, Meta, and Google Ads don't agree, duplicate events, broken postbacks, misconfigured deep links, consent tracking that's wrong in ways that don't show up until someone checks. - Meta CAPI & Server-Side Tracking. Setup with proper deduplication against pixel/SDK events, so you're not double-counting or losing signal after iOS 14. - RevenueCat & Subscription Mapping. Correct postback configuration for trial-to-paid and renewal events, so your MMP reflects real subscription LTV instead of just install counts. - Reporting. BigQuery and dbt pipelines feeding Looker Studio dashboards — blended CAC, cohort payback, LTV:CAC, the numbers that actually inform a budget decision. OTHER PROJECTS - Fintech remittance app. An AppsFlyer/Firebase mismatch from duplicate SDK-level events, cut from a 40% discrepancy down to 3%. - Africhange. Diagnosed and fixed a broken AppsFlyer OneLink setup that had been silently losing attribution on referral installs. - Analytics pipeline rebuild. Caught a deduplication bug in a client's BigQuery/dbt cohort dashboard that had been overstating net spend for months without anyone noticing. I walk you through every fix as I make it. By the time I'm done, you understand your own tracking setup, not just have one that works. 9+ years in mobile attribution specifically, $82,233 earned and 141 jobs delivered on Upwork, Top Rated Plus. Message me your problems, and I will fix them right away. Scale on the data you can trust

Senior Oracle APEX & .NET Developer | Full Stack Technologist | Healthcare Integration Specialist Experienced and solution-focused Senior Developer with a strong track record in designing scalable enterprise and medical software systems using Oracle APEX, .NET (C#), Python, and modern full-stack technologies. Specialized in DICOM/PACS, HL7 interoperability, and healthcare IT infrastructure, with hands-on experience in deploying medical imaging servers and real-time healthcare integration solutions. Proven expertise in building secure, maintainable systems across industries including banking, logistics, and healthtech. 🧠 Core Competencies & Technical Skills 🖥 Languages & Frameworks C#, Python, JavaScript (ES6+), HTML5, CSS3, React.js, Node.js, Electron.js, .NET Core 🗄️ Databases Oracle (PL/SQL), MS SQL Server, MySQL, PostgreSQL 💡 Oracle APEX & Plugin Development Advanced APEX solutions, dynamic PDF/DOCX/HTML reporting, custom plugin development 📊 Reporting Tools Power BI, JasperReports, AOP, MaxPrint 🏥 Healthcare Imaging & Interoperability Orthanc PACS Server – Setup, configuration, and DICOM routing DCM4CHEE Archive Server – Deployment and integration with enterprise workflows OHIF Viewer – Linked to Orthanc and DCM4CHEE for web-based diagnostic image viewing Mirth Connect – Designed HL7 ↔ JSON pipelines for EMR/EHR/HIS integrations 🛠 DevOps & Integration Git, RESTful APIs, CI/CD pipelines, Web Services 🤝 Soft Skills Problem solving, team collaboration, agile development, stakeholder communication 🏢 Latest Experience 🏥 Healthcare Imaging Systems Engineer (DICOM & Interoperability) ABMTEC Pvt. Ltd. | 2024 – Present Led the deployment and configuration of Orthanc and DCM4CHEE servers for hospitals and radiology centers. Successfully integrated OHIF Viewer with both Orthanc and DCM4CHEE, enabling zero-footprint DICOM image viewing via web browsers. Developed Mirth Connect pipelines to translate HL7 messages to JSON and vice versa, ensuring seamless data exchange between PACS, RIS, and HIS systems. Contributed to the technical documentation, testing, and support of imaging workflows in healthcare environments. Collaborated with radiologists, IT teams, and system integrators to ensure compliance with healthcare standards and operational efficiency. 🚀 Other Key Projects & Accomplishments MaxPrint Plugin & Reporting Service – Developed a plug-and-play APEX plugin for custom PDF/DOCX reporting. Automotive DataLake & DWH – Enabled ML-powered analytics using structured/unstructured data pipelines. Corporate Credit Bureau & Credit Risk Dashboards – Designed secure financial systems for risk monitoring. Dispute & PDF Management Systems – Delivered custom tools for financial institutions and document workflows. Shopify Integration Project – Automated order-to-production flow for an e-commerce backend. 🎓 Education Bachelor of Science in Computer Science – Virtual University of Pakistan Certified in Full Stack Web Development, Oracle APEX, and .NET Core

Most AI features die between prototype and production. I build the ones that don't — agents, LLM workflows, and the full-stack engineering that keeps them running when real users show up. Whether you're a founder integrating AI into your product, a team automating internal workflows, an agency needing a senior IC for client work, or a business adding LLM capabilities — if it involves shipping AI alongside solid engineering, I can help. Engagements range from one-week scoped builds to embedded 3-6 month contracts, hourly or fixed-price. What I work in: - AI agents and orchestration — LangChain, LangGraph, or custom loops when the framework gets in the way - LLM integration — OpenAI, Anthropic, function calling, structured outputs, eval pipelines - Workflow automation with LLMs — n8n, Make, custom Python pipelines - The production scaffolding that makes any of it real: Python (Flask/FastAPI), TypeScript, AWS, Docker, Postgres Where I'm a strong fit: - You have a working prototype and need to make it production-grade - You're integrating an LLM into an existing product without rewriting it - You need a senior full-stack + AI hand who can take a feature end-to-end - You have a focused short-term task — refactor, integration, bug fix, or audit on AI/Python/TS systems What I don't take on: - Pure ML research or training models from scratch - Anything where I can't talk directly to whoever decides what gets built 7+ years of full-stack engineering, last ~18 months focused on LLM/agent work. Top Rated, 100% JSS, 47 jobs, 1,100+ hours. Most recent long-term contract was 762 hours over 12 months — client wrote "tremendous expertise" verbatim. Most of my recent AI work is under NDA. Happy to walk through anonymized case studies on a short call. Send me a paragraph on what you're building. I'll tell you whether I'm the right fit, and if I'm not, I usually know who is. Prefer to talk? Message me and we'll set up a quick 20-minute call to see if we're a fit.

Looking for an experienced Mobile App Developer or Unity Game Developer who can turn your idea into a stable, launch-ready product? I’ve been coding since 2017, with over 9+ years of experience, specializing in Mobile App Development and Game Development using React Native, Flutter, and Unity, including cross-platform Android and iOS applications and 2D and 3D Mobile Game Development. I also build rapid mobile solutions with FlutterFlow, native Android apps with Java and Kotlin, native iOS apps with Swift and SwiftUI, and AI-powered applications with Firebase, API, and backend integrations. My core services include: • Mobile game mechanics, gameplay systems, and feature development • Mobile app and game bug fixing, upgrades, and feature improvements • Unity 2D and 3D game development using C# • Native Android app development using Java and Kotlin • Native iOS app development using Swift and SwiftUI • Cross-platform mobile app development with Flutter and React Native • FlutterFlow app development and rapid MVP creation • AI app development and AI-powered feature integration • Firebase, API, database, and backend integration • Python and Node.js backend connectivity • Performance optimization and ongoing application maintenance I focus on writing clean, organized, and maintainable code while creating products that run smoothly and feel intuitive to use. Whether you need a business application, a custom mobile solution, or a complete Unity game, I will help you choose a practical development approach based on your requirements and budget. Alongside my technical experience, I hold a Master’s degree in Project Management. This helps me turn complex requirements into clear milestones, realistic timelines, and an organized development process. Clients can expect regular progress updates, transparent communication, careful testing, and dependable delivery throughout the project. What are you planning to build? Which platforms do you want to support? Are we starting from scratch or improving an existing product? Share your idea, requirements, or current build, and I’ll help you determine the best way to move forward.

🥇 Total 5+ years of experience as a Full-stack Developer 💯 1 hours of response time with 100% Client Dedication! 🕛 Full Time Availability 👋Hey, Are you looking for an Expert Android Engineer? you are at the right place. I have a strong and deep understanding of Android SDK, Coroutines, MVVM, Retrofit, Room Database, and Android Mobile Applications. I'm an independent freelancer. I'm a Native Expert Android Engineer with 6+ years of experience developing all types of mobile applications using Kotlin and Java. I have experience in Dating, healthcare, Social, e-Commerce, education, etc kind of applications in Android. I have vast experience of developing websites and apps for various industries, including dating apps, fintech, social networking sites, health and wellness programs, taxi booking, food delivery, chats, messengers, audio/video chats, and sports and fitness apps. ► Excellent knowledge of Android/Java/Kotlin best practices and standard code style ► Experience with SCM tools, GIT, JIRA, Android Studio, ClearCase, etc. ► Strong skills in problem-solving and time management ► Knowledge of testing mobile applications ► Software platforms development experience, such as Linux and Android platform ► Familiar with the Android development toolkit and process. **MY TECHNICAL ABILITIES YOU CAN GET ** ✅ iOS and Android: Swift, Xcode, Kotlin, Java, Objective C, Android Studio ✅ React Native, Flutter, Ionic, React, XML, Redux ✅ Design and development of mobile apps for iOS and Android using Firebase, Hybrid Apps, and TypeScript ✅ Payment Gateways: WorldPay, PayPal, Apple Pay, Google Pay, Stancer, Stripe, 2Checkout, Adyen, Payline, Skrill and Braintree ✅ App Deployment on Google Play Store, IOS store and also on third party store as well ✅ Push Notifications, Payment Gateways, AWS, Analytics, Ads, Firebase, and React Native Expert ✅ Back-end API development with ASP.NET CORE, Node, Python, Django, PHP and Laravel Framework I have a proven track record of working effectively in both large teams and one-on-one with clients. I can assist you in creating websites and apps from scratch, taking your ideas and turning them into reality. I'm a reliable partner in your project's journey, and I'm dedicated to achieving your goals. For me is important to perform quality work for the client, I treat each project as my own because their success fuels mine's. When I’m working on a project, I don’t want just to meet deadlines. Rather, I prefer to complete the project well ahead of schedule. 𝐖𝐡𝐲 𝐂𝐡𝐨𝐨𝐬𝐞 𝐌𝐞: 🚀 Great Work Ethic: I'm dedicated to doing top-quality work on every project. 🚀 Innovative Solutions: Provide innovative and impactful solutions to challenges. 🚀 Transparent Communication: Clear and open communication, utilizing platforms like Slack, Discord, Telegram, Skype, Jira, Trello, Asana, or ClickUp for timely updates. 🚀 Quick Learner : Quickly adept and master new frameworks, ensuring seamless integration into your projects. 🔷 READY TO TALK: 🕒 Schedule I'm here to discuss your project anytime, whether in writing or via voice or video calls. 💬 Availability I'm available 24/7 because your satisfaction matters most. Yes, even on Sundays. 📩 Reach Out Message me anytime, anywhere, and I'll get back to you ASAP. Let's chat about your project whenever you're ready.