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Expert in Google Sheets, App Script, Add-ons, Google Cloud and Suite Admin, MS Office VBA automation. Deep knowledge of MS and Google products, cloud technologies, domains portfolio management, web publishing. Certified Advanced Google Analytics and Google Tag Manager Fundamentals. Certified IT professional with extensive background in PM, IT management, development.

Do you need IT help for your business but find working with developers difficult? Are you struggling to achieve your business goals with the software you use? I'm here to take this burden off your shoulders so that you can focus on what you do best - your business. Programming, for me, is a tool only - not an objective itself. I will take care of all IT work and make sure it is aligned with your goals. Here are the ways I help companies thrive: • Building XML related systems — many times XML is the best choice for exchanging data, especially when you need to control the structure of nested nodes of data. I'll help you utilize the best of XML technology so it can effectively serve your business needs. • Design of tailored systems — when your business model that needs a boost with an automated, intelligent software. I'll work with you closely to understand the goals and build software that moves your productivity and profits to a completely new level. • Optimization of existing systems — when your software doesn't fully serve your needs. I'll transform it in the most effective way to keep all that is good in it and add the new value you are seeking. • Building a team - when you need to effectively achieve your IT goals. I'll find the best people that can achieve your goals within the budget and time. • Building a website - when you want to improve your online presence. I'll design a beautiful and fast website that brings you more clients and conversions. You will see a major increase in your productivity and profitability, your systems will start bringing you clients and money. With me, you get someone who understands your business and speaks your language - an honest professional whom you can trust. What clients say about my work: "Single handedly the best developer I have ever come across in my 15 years working in this industry. I cannot recommend Jacek enough. His professionalism, quality of work, delivery, communication are all of the highest quality. I will be putting more work Jacek's way." - Richard "I've already scheduled another project with Jacek. It's always a pleasure!" - Cheryl "Designed the page within my guidelines and requirements. Made front end elegant and functional. Back end was clean and user-friendly. Fantastic communication, extensive expertise. Will hire in future" - Vitold Technologies I work with: * XSLT, XPath, XML, XML Schema, exist-db, Apache FOP, Ibex, Xalan, MSXSL, Saxon, Dita, Docbook, EXSLT, XQuery, xsltproc, HTML5, XHTML, SVG, SpreadsheetML, WordProcessingML, lxml * GIS Systems: Google Maps, OpenStreet Maps, Gisgraphy, Geocoding, Leflet, Mapbox, FusionTables, OpenLayers, Geonames * PHP: PHP5, PHP7 * MySQL: optimisation, speed up, complex queries * API's: design and various integrations: Quickbooks, Expedia, Highrise, Airtable, Zapier, Google and many more, * JavaScript, ECMA6, React.js, Canvas * Drupal: Drupal 7, Drupal 8 * Wordpress * Apache SOLR * Chess: Stockfish, * ImageMagick, * CRM, * OSTicket Businesses I am usually a good match for: * Sport: tennis, chess, ski, freeride, snowboard, gym, fitness * Travel: booking engines, travel websites To take this chat to the next level, here's what you should do next: Let's see if we're the right fit. If you're looking for a tailored IT system for your business and a developer that will bring you a productivity boost and more results, we're aligned. To get the conversation started, hit the Hire Now button in the top-right corner. P.S. I travel a lot. No matter what country you are from, feel free to reach out - I may already know how to say 'hello' in your language! :) Jacek Francuz

I build mobile apps where performance, reliability, and technical execution directly affect the business. My work includes official Amazon Location Service Android SDKs, ONWARD Medical ARC-EX, an FDA-cleared spinal cord stimulation system, and Fibe, a fintech lending app with 10M+ downloads. I am usually hired when the project involves more than standard app screens: real-time systems, BLE/IoT, AI, payments, hardware integrations, maps, regulated workflows, or complex architecture. 𝐂𝐨𝐫𝐞 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 • Android: Kotlin, Java, Jetpack Compose, MVVM, Clean Architecture • iOS integration: Swift, SwiftUI, native SDKs, platform channels • Cross-platform: Flutter and Kotlin Multiplatform for Android and iOS • BLE, IoT, and hardware: medical devices, robotics, RFID, connected products • Real-time systems: WebRTC, Socket programming, video streaming, low-latency chat • Maps and location: geofencing, live tracking, routing, custom SDKs • Fintech and payments: wallets, KYC flows, subscriptions, payment gateways • AI mobile features: streaming chat, character memory, LLM integrations, on-device ML • App rescue: refactoring, crash fixing, performance tuning, architecture cleanup 𝐖𝐡𝐲 𝐂𝐥𝐢𝐞𝐧𝐭𝐬 𝐇𝐢𝐫𝐞 𝐌𝐞 1. The app needs to scale Millions of users, peak traffic, complex state, low-end devices, and performance-sensitive flows. 2. The app cannot fail Medical, fintech, real-time, logistics, hardware, or business-critical workflows where reliability matters. 3. The app is technically difficult BLE devices, AI features, native SDKs, WebRTC, payments, maps, or legacy code that needs expert handling. 4. The product needs senior ownership Architecture, implementation, technical decisions, tradeoffs, code quality, and delivery without heavy supervision. 𝐇𝐨𝐰 𝐈 𝐖𝐨𝐫𝐤 • I clarify the product goal, technical risks, and success criteria before writing code • I break work into clear milestones, so progress is visible • I share frequent updates and demo videos for major features • I communicate tradeoffs directly instead of hiding problems • I write production-grade code with clean architecture, reliable state management, testing, CI/CD readiness, and maintainable structure I am the right fit if your mobile app is complex, high-value, scaling fast, connected to hardware, using AI, handling payments, relying on real-time data, or currently suffering from poor architecture. If that sounds like your project, send me your goal, current stage, and biggest technical concern. I will respond with a clear plan, a realistic timeline, and the safest way to move forward.

Your app idea needs more than a developer who writes code and disappears. You need someone who understands your mobile app development goals, builds clean code, and ships on time. I'm a Flutter developer with 5+ years of mobile app development experience, building cross-platform apps for iOS and Android. From fintech and e-commerce to SaaS and travel, I've taken mobile apps from Figma files to live App Store and Play Store releases. I also build AI-powered mobile apps - ChatGPT API integration, OpenAI-powered features, and intelligent automation built directly into Flutter applications. 𝐖𝐡𝐚𝐭 𝐈 𝐝𝐨: — Flutter mobile app development from scratch (concept → launch) — AI mobile app development (ChatGPT, OpenAI API integration) — Full stack mobile app development (Flutter + Node.js, Firebase, REST API backend) — Figma to Flutter UI conversion, pixel-perfect — Firebase integration (Auth, Firestore, FCM, Storage) — REST API & third-party API integration — Stripe, RevenueCat & in-app purchase integration — Google Maps & geolocation integration — FlutterFlow development and customization — Taking over and completing existing Flutter projects started by another developer — App Store & Play Store publishing — Bug fixing, performance optimization, and app improvements 𝐀 𝐟𝐞𝐰 𝐦𝐨𝐛𝐢𝐥𝐞 𝐚𝐩𝐩 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 𝐩𝐫𝐨𝐣𝐞𝐜𝐭𝐬 𝐰𝐨𝐫𝐭𝐡 𝐦𝐞𝐧𝐭𝐢𝐨𝐧𝐢𝐧𝐠: → 𝗙𝗶𝗻𝗧𝗲𝗰𝗵 𝗯𝗮𝗻𝗸𝗶𝗻𝗴 𝗮𝗽𝗽: 150+ Figma screens converted to a production Flutter app in 4 weeks. Now live on both the App Store and Play Store with thousands of active users. → 𝗘-𝗰𝗼𝗺𝗺𝗲𝗿𝗰𝗲 𝘀𝗲𝗹𝗹𝗲𝗿 𝗮𝗽𝗽: 2+ year ongoing mobile app development partnership. Fixed critical Stripe payment failures and rebuilt the analytics dashboard. Still running, still scaling. → 𝗧𝗿𝗮𝘃𝗲𝗹 𝗮𝗽𝗽 𝗳𝗼𝗿 𝗮𝗶𝗿𝗹𝗶𝗻𝗲 𝗰𝗿𝗲𝘄𝘀: Full MVP mobile app development, concept to App Store in 12 weeks. Geolocation, restaurant discovery, and custom workflows. On time, on budget. 𝐓𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐬𝐭𝐚𝐜𝐤 𝐟𝐨𝐫 𝐦𝐨𝐛𝐢𝐥𝐞 𝐚𝐩𝐩 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: Flutter · Dart · Firebase · Supabase · REST APIs · Stripe · Google Maps API · FlutterFlow · Provider · BLoC · Riverpod · Hive · SQLite · Node.js · CI/CD for iOS & Android 𝗔𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲: MVVM, Clean Architecture, because a mobile app that can't scale will cost you later. 𝐖𝐡𝐲 𝐜𝐥𝐢𝐞𝐧𝐭𝐬 𝐬𝐭𝐚𝐲: → Fixed scope and fixed timelines, no surprise invoices at week 6. → Weekly builds so you can test your mobile app with real users throughout. → Clean code that your next developer can actually read and extend. → I speak founder, not engineer. You always know where your mobile app development stands. 𝐑𝐞𝐚𝐝𝐲 𝐭𝐨 𝐬𝐭𝐚𝐫𝐭 𝐲𝐨𝐮𝐫 𝐦𝐨𝐛𝐢𝐥𝐞 𝐚𝐩𝐩 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭? Send me your Figma files or a quick brief. I'll reply with a clear proposal scope, timeline, and cost within a few hours. Regards, Muhammad Sohail Keywords: Flutter Developer | Flutter App Developer | Mobile App Development | Flutter Mobile App Development | AI Mobile App Developer | ChatGPT Integration | OpenAI API Integration | AI App Development | Full Stack Developer | Full Stack Mobile App Development | Node.js | Backend Development | iOS App Development | Android App Development | Cross-Platform App Development | Firebase | Supabase | REST API Integration | Stripe Integration | Google Maps Integration | FlutterFlow Developer | BLoC | Riverpod | Provider | Figma to Flutter | MVP Development | FinTech App Development | E-commerce App Development | SaaS Mobile App | Real-Time Chat App | App Store Deployment | Play Store Deployment | Taking Over Existing Flutter Projects | Bug Fixing | Performance Optimization | Clean Architecture | MVVM

Top rated GIS Developer | Cloud Architect | Tech Entrepreneur 🌎 Having 4+ years of experience and over 1000+ hours delivered on Upwork with a 100% Job Success score, I build robust, user-friendly GIS applications that turn raw spatial data into clear business insights. These are the industries in which I have created projects as a GIS developer: - SaaS 🌐 - real-estate 🏡 - environment & ecotech🌳 I build end-to-end platforms that merge geospatial intelligence, scalable cloud backends, and modern UIs. From urban analytics & neighborhood profiling to environmental risk mapping and enterprise-grade spatial APIs, my work is where tech meets real-world impact. 🏆 Upwork Top Rated (Top 3% globally) – trusted by international clients for delivering high-quality, cost-optimized solutions. 💡 How I create value for clients and increase ROI by 40%: Smart Cloud Architecture – efficient AWS design, auto-scaling, cost savings. Secure Open-Source Frameworks – GeoServer, PostGIS, Pelias, MapServer, Django, DRF etc. Cost Efficiency – handling backend + GIS + DevOps myself → avoiding unnecessary extra dev hires. 🎯GIS Expertise: Interactive Map Visualization, Mapping app, Routing Problems, Algorithm, Data Scraping, Report generation using geospatial analysis (PDF), Route optimization 🔧 Tech Stack Highlights: 🌐 Backend & Web: Django, DRF, FastAPI, Node.js, Payments system (Stripe) 🗄️ Databases: PostgreSQL + PostGIS, MySQL, MongoDB, AWS Timestream 🗺️ GIS Tools: GeoServer, MapServer, QGIS, GDAL/OGR, TileServer-GL, OSRM, Tileserver-GL, Osmium ☁️ Cloud & DevOps: AWS (EC2, S3, Lambda, RDS, Timestream), Docker, CI/CD, Nginx, Gunicorn 📊 Data & ML: Pandas, NumPy, Scikit-learn, MLflow, AWS MLOps, Spark (basic) 🔒 Security & APIs: Token-based access, role-based permissions, API gateway design 🔍 Datasources: Raster | Vector | Point Clouds, Openstreetmap, Google Maps, GOES/Landsat/Sentinel Hub, SAR data. 💪 With deep expertise in GIS, geospatial mapping, and web development, I deliver solutions faster and at higher quality than most developers out there. 🤝 My goal is to help you scale your business effectively—let’s connect for a chat or call to discuss your challenges and how I can help you achieve your goals!

Flutter & React Native developer with 42+ completed projects and 1,271+ hours on Upwork — helping startups go from concept to App Store without the typical delays, miscommunication, or technical debt. My Focus: cross-platform mobile apps (iOS & Android) built with Flutter or React Native, backed by clean Node.js/Firebase architecture. Whether you're validating an MVP in 4 weeks or scaling a SaaS product to 10,000+ users, I deliver production-ready code that ships. What I specialize in: → Startup MVPs built fast without cutting corners (SaaS, on-demand, consumer apps) → Flutter apps with Firebase, Supabase, PostgreSQL backends → React Native apps with full API integrations (Stripe, OpenAI, Google Maps, Twilio) → Lovable.dev + AI-powered product prototyping and rapid UI generation → App Store + Google Play deployment, end-to-end → Rescue projects — I've rebuilt and fixed broken apps from other developers AI & Modern Tools I work with: → OpenAI GPT / Assistants API → Gemini AI / Claude AI integrations → Lovable.dev for AI product prototyping → Cursor AI & AI-assisted development workflows → Firebase AI features & Supabase AI stack → Whisper AI, text-to-speech, voice assistants → AI chatbots, recommendation systems & automation flows Recent results: → Delivered BookBound mobile app (iOS/Android + back office) — 260 hours, 5-star review → Built Eurologica cross-platform solution over 6+ months — 5-star, "amazing mobile app developer" → Delivered iOS Low-Code App Transformation ($1,630 fixed price, 5-star) Message me your biggest technical concern about this project. I'll respond within 4 hours with a straight answer.