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⚠️ 𝗪𝗼𝘂𝗹𝗱 𝘆𝗼𝘂 𝗹𝗶𝗸𝗲 𝘁𝗼 𝘀𝗲𝗲 𝘆𝗼𝘂𝗿 𝗮𝗽𝗽 𝗲𝘃𝗲𝗻 𝗯𝗲𝗳𝗼𝗿𝗲 𝗶𝗻𝘃𝗲𝘀𝘁𝗶𝗻𝗴 𝗮 𝘀𝗶𝗻𝗴𝗹𝗲 𝗰𝗲𝗻𝘁? ⚠️ Before you accept or pay anything, I can prepare a simple flowchart of your App + the design of the first 4 screens in Figma. This way, you can review my work and have a clear vision of how your app can come to life even before hiring me. 🏆 𝗔𝗰𝗵𝗶𝗲𝘃𝗲𝗺𝗲𝗻𝘁𝘀: ✅ Over 7 years of experience in mobile app development ✅ 50+ published apps (App Store & Play Store) ✅ 100% project success rate (client satisfaction index) ✅ 700+ hours worked & over $70K earned I am a senior mobile app developer with more than 7 years of experience building cross-platform apps with Flutter. Whether it’s a business app, e-commerce, e-learning, booking system, delivery app, or marketplace, I have delivered clean, scalable, and fully functional applications for startups and companies worldwide. I specialize in building high-quality, high-performance mobile apps using Flutter, Kotlin, and Swift. With a solid foundation in clean architecture and deep expertise in state management solutions (BLoC, Riverpod, Provider, GetX), I deliver applications that are not only visually appealing but also robust, scalable, and easy to maintain. 🔹 𝗧𝗲𝗰𝗵 𝗦𝘁𝗮𝗰𝗸: ✔ Frontend / Mobile: Flutter, Kotlin & Swift (Android & iOS) ✔ Backend: Node.js, Python, Firebase ✔ UI/UX: Figma, Adobe XD, Sketch ✔ Databases: SQLite, MySQL, PostgreSQL, Firebase ✔ AI & Automation: OpenAI, ChatGPT integrations, marketing automation 🌐 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝘆 𝗘𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲: ◉ Delivery Apps (food, grocery, restaurants) ◉ Transportation & Mobility Apps (taxi, logistics, tracking) ◉ On-Demand Service Apps (beauty, maintenance, technicians) ◉ Health & Fitness Apps ◉ Social, Dating & Messaging Apps ◉ Real Estate & Business Apps ◉ Booking & Event Apps 🔹 𝗦𝗸𝗶𝗹𝗹𝘀 & 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲: ✅ Social Integration (Google, Facebook, Apple, Instagram, YouTube) ✅ Payment Integration (Stripe, PayPal, Google Pay, Apple Pay, Razorpay) ✅ Subscriptions & In-App Purchases (including RevenueCat) ✅ Real-time Chat, Audio/Video Calls & Live Streaming ✅ Location & Tracking (Google Maps, Places API, real-time GPS) ✅ Security & Authentication (2FA, Firebase, Twilio, Mailgun) ✅ QR Code & Barcode Generation 🎁 𝗪𝗵𝗮𝘁 𝗬𝗼𝘂 𝗚𝗲𝘁 𝗪𝗼𝗿𝗸𝗶𝗻𝗴 𝗪𝗶𝘁𝗵 𝗠𝗲: 1 month of free maintenance after app launch Lifetime technical support for questions & exclusive app follow-up (optional) Intellectual property rights from day one Full deployment on App Store & Google Play Apps developed strictly following Apple & Google guidelines 💬 𝗡𝗲𝘅𝘁 𝗦𝘁𝗲𝗽𝘀 If you have an idea and want to turn it into a professional, robust, and scalable app, I’d be glad to help. Click “Invite to Job” and let’s discuss your project. Sincerely, Paulo Jeferson 🔹 𝗞𝗲𝘆𝘄𝗼𝗿𝗱𝘀: ✔ Mobile App Development ✔ Flutter App Development ✔ Flutter Developer ✔ App Creation ✔ Mobile App Building ✔ Cross-Platform Development ✔ Hybrid Development ✔ App Design & Development ✔ Android Development ✔ iOS Development ✔ Real Estate Apps ✔ Food Delivery Apps ✔ Dating App Developer ✔ Grocery Apps ✔ Mobile App Design

With a passion for building intelligent, high-performance apps with custom UIs, I use Flutter to help startups and companies bring their next big product on any screen to life, from early concept to store launch. Over 12,000+ hours on Upwork, my focus has been simple: deliver clean, scalable architecture and native-grade user experiences that scale cleanly as your business grows. My areas of expertise include: - Flutter & Architecture - Enterprise State Management (Riverpod, BLoC, MobX) - Clean Architecture, Unit & Widget Testing - Custom UI/UX, Complex Animations & Pixel-Perfect Design Implementation (Figma, Lovable, Sketch, Adobe XD) - Platform Channels & Native Bridge Integration (iOS / Android) AI & Modern Backend Stack - Custom AI Agents & LLM Integrations - Firebase & Supabase Specialist - Database Design & APIs (MySQL, SQLite, REST & GraphQL) Monetization & App Lifecycle - App Monetization & In-App Purchases (RevenueCat, AdMob) - Analytics & Stability (Crashlytics, Google Analytics, Push Notifications) - Complete App Store & Google Play Store Publishing, Deployment & CI/CD Whether you need a flagship MVP built from scratch, complex features integrated into an existing codebase, or a modern AI-driven mobile experience, I'm ready to help you ship fast without sacrificing quality. Welcome! Let's have a chat :)

Hi! I'm Douglas, a seasoned Mobile Developer with over 18 years of full-stack experience, including 6+ years specializing in Flutter. I've helped startups and established companies build, publish, and scale robust mobile apps — some of them with thousands of active users. 🚀 Why clients hire me I bring strong technical leadership: I’ve led teams, defined architectures, set delivery goals, and supported devs through challenges. I understand the full cycle: from Figma prototypes to Google Play / App Store releases and CI/CD automation. I value clean code, maintainability, and scalable app structures (MVVM, Clean Architecture, State Management like RxNotifier, BLoC, MobX). 📱 Apps I’ve worked on Finclass – Learn finance with world-class investors Staage – Marketing education platform with gamified content Staart – Tech learning app for aspiring devs Soletrando – A gamified spelling/grammar app (targeted for kids & adults) AprendaViola – Music app to practice Brazilian viola caipira myProfit – Personal finance control …and many internal tools and MVPs. ⚙️ Tech Stack Flutter, Dart, Firebase, Node.js, GitHub Actions, Codemagic Firebase Auth, Firestore, Cloud Functions Google/Apple sign-in, push notifications, Lottie, REST APIs Automated deployments, multi-flavor support 🧠 Bonus Built a tool in Node.js to monitor over 50 networks for printer status reports Excellent at understanding business logic and transforming it into smooth UX 🤝 Looking for I'm open to long-term or short-term projects — as long as the environment is collaborative, healthy, and goal-oriented. I’ve never worked in international projects yet, but I’m excited and ready for that challenge. Let’s build something impactful together!

𝐇𝐨𝐰 𝐜𝐚𝐧 𝐈 𝐡𝐞𝐥𝐩 𝐲𝐨𝐮? 𝑾𝒐𝒓𝒌𝒊𝒏𝒈 𝒘𝒊𝒕𝒉 𝒎𝒆, 𝒚𝒐𝒖 𝒘𝒊𝒍𝒍: ⭐ Ensure that your user has an application that runs smoothly and is not constantly plagued by bugs ⭐ Have clean code. Easy to maintain, modify and scale. No more starting the project at a great speed and after a while spending more time correcting code than writing new features ⭐ Receive constant updates. You will always know what I did yesterday, today and what I'm going to do tomorrow ⭐ 𝑺𝑨𝑽𝑬 𝑴𝑶𝑵𝑬𝒀 by working with someone who doesn't screw around just to get more paid hours. I have zero interest in making the project take longer than necessary to deliver it with quality. ℹ️ ℂ𝕙𝕖𝕔𝕜 𝕠𝕦𝕥 𝕞𝕪 𝕠𝕟𝕝𝕚𝕟𝕖 𝕔𝕦𝕣𝕣𝕚𝕔𝕦𝕝𝕦𝕞/𝕡𝕠𝕣𝕥𝕗𝕠𝕝𝕚𝕠 𝕨𝕖𝕓𝕤𝕚𝕥𝕖: igorcurriculum.com 👨‍💻 𝗛𝗲𝗹𝗹𝗼. 𝗜'𝗺 𝗜𝗴𝗼𝗿, 𝗮 𝗳𝗹𝘂𝘁𝘁𝗲𝗿 𝗮𝗻𝗱 𝗱𝗮𝗿𝘁 𝘀𝗽𝗲𝗰𝗶𝗮𝗹𝗶𝘀𝘁 𝘐 𝘩𝘢𝘷𝘦 𝘢𝘭𝘸𝘢𝘺𝘴 𝘣𝘦𝘦𝘯 𝘱𝘢𝘴𝘴𝘪𝘰𝘯𝘢𝘵𝘦 𝘢𝘣𝘰𝘶𝘵 𝘬𝘦𝘦𝘱𝘪𝘯𝘨 𝘶𝘱 𝘸𝘪𝘵𝘩 𝘵𝘦𝘤𝘩𝘯𝘰𝘭𝘰𝘨𝘺 𝘯𝘦𝘸𝘴 𝘢𝘯𝘥 𝘮𝘢𝘳𝘬𝘦𝘵 𝘵𝘳𝘦𝘯𝘥𝘴. 𝘐𝘯 𝘵𝘩𝘢𝘵 𝘴𝘦𝘯𝘴𝘦, 𝘸𝘩𝘦𝘯 𝘐 𝘴𝘢𝘸 𝘍𝘭𝘶𝘵𝘵𝘦𝘳 𝘪𝘯 𝘚𝘦𝘱𝘵𝘦𝘮𝘣𝘦𝘳 2019 𝘢𝘯𝘥 𝘢𝘭𝘭 𝘪𝘵𝘴 𝘱𝘰𝘵𝘦𝘯𝘵𝘪𝘢𝘭, 𝘐 𝘴𝘰𝘰𝘯 𝘬𝘯𝘦𝘸 𝘵𝘩𝘢𝘵 𝘵𝘩𝘢𝘵 𝘸𝘢𝘴 𝘵𝘩𝘦 𝘧𝘶𝘵𝘶𝘳𝘦 𝘢𝘯𝘥 𝘐 𝘴𝘵𝘢𝘳𝘵𝘦𝘥 𝘶𝘴𝘪𝘯𝘨 𝘵𝘩𝘦 𝘵𝘦𝘤𝘩𝘯𝘰𝘭𝘰𝘨𝘺 𝘢𝘵 𝘢 𝘵𝘪𝘮𝘦 𝘸𝘩𝘦𝘯 𝘧𝘦𝘸 𝘶𝘴𝘦𝘥 𝘪𝘵, 𝘵𝘩𝘶𝘴 𝘣𝘦𝘪𝘯𝘨 𝘢𝘯 𝘦𝘢𝘳𝘭𝘺 𝘢𝘥𝘰𝘱𝘵𝘦𝘳. 𝘚𝘪𝘯𝘤𝘦 𝘵𝘩𝘦𝘯, 𝘐'𝘷𝘦 𝘧𝘰𝘤𝘶𝘴𝘦𝘥 𝘰𝘯 𝘴𝘱𝘦𝘤𝘪𝘢𝘭𝘪𝘻𝘪𝘯𝘨 𝘮𝘺 𝘬𝘯𝘰𝘸𝘭𝘦𝘥𝘨𝘦 𝘪𝘯 𝘵𝘩𝘦 𝘥𝘢𝘳𝘵 𝘭𝘢𝘯𝘨𝘶𝘢𝘨𝘦 𝘢𝘯𝘥 𝘶𝘯𝘥𝘦𝘳𝘴𝘵𝘢𝘯𝘥𝘪𝘯𝘨 𝘩𝘰𝘸 𝘵𝘩𝘦 𝘍𝘭𝘶𝘵𝘵𝘦𝘳 𝘧𝘳𝘢𝘮𝘦𝘸𝘰𝘳𝘬 𝘢𝘯𝘥 𝘪𝘵𝘴 𝘮𝘢𝘪𝘯 𝘢𝘱𝘪'𝘴 𝘸𝘰𝘳𝘬 𝘶𝘯𝘥𝘦𝘳 𝘵𝘩𝘦 𝘩𝘰𝘰𝘥. 📈 𝐓𝐡𝐞 𝐦𝐚𝐢𝐧 𝐬𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬 𝐈 𝐮𝐬𝐞 𝐭𝐨 𝐞𝐧𝐚𝐛𝐥𝐞 𝐩𝐫𝐨𝐣𝐞𝐜𝐭 𝐬𝐜𝐚𝐥𝐚𝐛𝐢𝐥𝐢𝐭𝐲: ✅ Micro-Frontend for splitting tasks in bigger groups ✅ 100% Test coverage for quality assurance ✅ Create Internal Packages for better componentization ✅ Clean Architecture for easy to work project structure ✅ Efective Documentation for new dev's faster introduction ✅ Multithreads for ui perfomance ➕ Among the other intermediate-advanced topics that I know are: • Theme Data manipulation • Deep knowledge in Element/Render tree • Widget lifecycle management • Use of Flutter DevTools to find performance issues and fix them • Implicit and explicit animations • Direct canvas drawing • Effective dart documentation • Create dart CLI tools • Flutter Web SEO • Deep knowledge in Element/Render tree • Internationalization • Dependency Injection • Test presets and default mocks • Golden tests - 𝑪𝒍𝒊𝒆𝒏𝒕 𝒆𝒙𝒑𝒆𝒓𝒊𝒆𝒏𝒄𝒆 𝒊𝒔 𝒎𝒚 𝒏𝒖𝒎𝒃𝒆𝒓 𝒐𝒏𝒆 𝒑𝒓𝒊𝒐𝒓𝒊𝒕𝒚 So let me help you add value to your client. 📩 For that, please shoot me a message and let's talk just to ensure I will be a great fit for you

⚡ 𝐈 𝐛𝐮𝐢𝐥𝐝 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧-𝐫𝐞𝐚𝐝𝐲 𝐦𝐨𝐛𝐢𝐥𝐞 𝐚𝐩𝐩𝐬 — 𝐧𝐨𝐭 𝐣𝐮𝐬𝐭 𝐩𝐫𝐨𝐭𝐨𝐭𝐲𝐩𝐞𝐬. If you're looking for a Flutter developer who can turn your idea into a scalable, high-performance app, you're in the right place. 💡 Before you invest anything, I can create a basic app flow + the first screens in Figma, so you clearly see how your app will work. 𝐑𝐞𝐬𝐮𝐥𝐭𝐬 & 𝐄𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞 ✅ 45+ apps published on App Store & Google Play ✅ $70K+ earned ✅ 700+ hours worked ✅ 100% client satisfaction 𝐖𝐡𝐚𝐭 𝐈 𝐝𝐞𝐥𝐢𝐯𝐞𝐫 • Complete mobile apps (Android & iOS) • Clean, scalable, and maintainable code • High-performance Flutter applications • API integrations (REST, Firebase, etc.) • App Store & Google Play publishing support 𝐓𝐞𝐜𝐡 𝐒𝐭𝐚𝐜𝐤 ✔ Flutter (main) ✔ Kotlin & Swift ✔ Firebase, Node.js, Python ✔ REST APIs & integrations ✔ State management: BLoC, Riverpod, Provider, GetX 𝐅𝐨𝐜𝐮𝐬 I work mainly with: • Startups launching MVPs • Businesses scaling existing apps • Clients who need reliable, long-term solutions 𝐖𝐡𝐲 𝐰𝐨𝐫𝐤 𝐰𝐢𝐭𝐡 𝐦𝐞 • Clear and fast communication • Clean architecture & organized code • Apps built to scale (not break later) • Real commitment to your project 𝐍𝐞𝐱𝐭 𝐒𝐭𝐞𝐩 Have an idea? Let’s turn it into a real product. Click “Invite to Job” and let’s talk 🚀 🔍 𝗞𝗲𝘆𝘄𝗼𝗿𝗱𝘀: ✔ Mobile App Development ✔ Flutter App Development ✔ Flutter Developer ✔ App Creation ✔ Mobile App Building ✔ Cross-Platform Development ✔ Hybrid Development ✔ App Design & Development ✔ Android Development ✔ iOS Development ✔ Real Estate Apps ✔ Food Delivery Apps ✔ Dating App Developer ✔ Grocery Apps ✔ Mobile App Design

I build production-minded automation, mobile apps, APIs, and AI-assisted workflows that need to work reliably outside a demo. My strongest fit is where mobile, Python automation, data capture, and integrations meet: - Python automation: Playwright/Selenium workflows, API integrations, Google Sheets/Excel outputs, scheduled pipelines, data normalization, retries, logging, and handoff documentation. - Mobile/Flutter: 7+ years in mobile, including Flutter/Dart, Android/Kotlin, iOS/Swift, Firebase, offline-first data, API integrations, dynamic forms, image/document capture, push notifications, and release/debug workflows. - AI agents and LLM tooling: practical experience with local automation, agent-style workflows, MCP-style tool integration, structured actions, human approval loops, and debugging tool-calling behavior. - Backend/API work: Django, Google Cloud Functions, REST/GraphQL integrations, Docker environments, BFF patterns, caching, and production troubleshooting. Relevant examples: - Built Python Google Cloud Functions for support/newsletter workflows and Facebook API data caching for a Flutter/Kotlin app. - Built a Django/React allocation system using OR-Tools and automated Google Sheets workflows. - Modernized Flutter apps with dynamic forms, validation, image upload, API compatibility updates, Firebase, and BLoC. - Delivered offline-first Android/Flutter field apps with maps, local databases, sync, scanners, camera/device integrations, and production stability work. - Debugged and improved mobile performance, including large map rendering and app loading/stability issues. I work best on small, urgent, concrete problems: a scraper that must produce clean Excel output, a Flutter/API bug that blocks users, an automation that needs retries/logs, or an agent/local-LLM workflow that is stuck in a loop. I will tell you where the risk is, keep the scope clear, and leave code/documentation that someone else can maintain.