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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

I'm a full-stack developer with hands-on experience building mobile apps and back-end systems for fintech. At my most recent role, I developed a digital credit app from scratch in Flutter that became one of the company's main channels for customer contracts, while also shipping new and improved back-end flows in PHP (Symfony). Whether you need a mobile app built from the ground up, a solid back-end API, or help improving an existing product, I can help. ∙ Knows Flutter/Dart, PHP (Symfony), Python, SQL, React, and JavaScript ∙ Experience with AWS, PostgreSQL, MongoDB, and MySQL ∙ Background in cybersecurity (AWS Cloud Developer certified; MBA in Cybersecurity in progress) ∙ Fluent in English, native Spanish speaker, plus Portuguese Clear, regular communication is important to me. Let's keep in touch!

Senior Full Stack Engineer with 8+ years building scalable apps across fintech, payments, logistics, e-commerce (POS) and SaaS — production solutions serving 5M+ users and 10K+ businesses. Currently Software Engineering Coordinator at ConnectPlug, leading ERP modernization, payment microservices, delivery platform migration and franchise management. Also Full Stack Developer at FleetPay (freelance), delivering backend and Flutter mobile features end-to-end. STACK • Backend: PHP, Laravel, Laravel Octane (RoadRunner), Node.js, TypeScript, REST APIs, Webhooks • Frontend: Vue 3, Nuxt.js, React, TypeScript, Tailwind • Mobile: Flutter, Dart (iOS/Android release) • Cloud: AWS (Lambda, ECS, DynamoDB, S3, CloudWatch), Docker, CI/CD (GitHub Actions, Vercel) • Databases: MySQL, PostgreSQL, DynamoDB, SQL Server • Testing: PHPUnit, Jest, Cypress, TDD, Clean Architecture, SOLID • AI: Cursor, Claude, MCP, Copilot — code generation, tests, E2E automation, AI code review KEY ACHIEVEMENTS • Led online payment microservice and provider-agnostic payment link platform (Laravel Octane, PostgreSQL) • Coordinated legacy delivery migration to high-performance SaaS (Octane + DynamoDB, Open Delivery), 24M orders/month • Full stack across Laravel microservices and Flutter apps (banking UI, OFX export, mobile release engineering) • End-to-end migration of payment processor handling millions of transactions/day • Modular payment integrations (iFood, Cielo, Google Pay, Apple Pay, Asaas) • Banking partner integrations: KYC, biometrics, signed webhooks • Optimized queries from seconds to microseconds; reduced 11GB+ Webpack builds • 3x faster delivery via AI-assisted development • Modernized legacy stacks to Vue 3/Nuxt/TypeScript and modular microservices PROFILE Engineering Coordinator · Tech Lead · Senior Software Engineer · Software Architect Distributed systems, microservices, performance, technical leadership, mentorship, CI/CD São Paulo, Brazil — Open to Remote, Hybrid and International Open to: Senior/Staff Engineer, Tech Lead, Engineering Manager, Software Architect, Freelance Languages: Portuguese (native), English (Professional Working) #PHP #Laravel #TypeScript #VueJS #NuxtJS #React #Flutter #AWS #Docker #DynamoDB #FullStack #TechLead #Fintech #Payments #SaaS #Microservices #AIAssistedDevelopment #SeniorEngineer #RemoteWork

⚡ 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 architected a multi-login platform using Next.js, Supabase, Electron, and Puppeteer that supports 2,900+ daily active users, has been sold to over 10,000 customers, and manages 800+ concurrent sessions every day. I designed and implemented the entire system architecture to be scalable, secure, and high-performance. As a Full Stack Developer with 8+ years of experience, I specialize in building cross-platform applications for web, desktop, and mobile. My expertise includes: 🛠️ Next.js, Supabase, Electron, Node.js, Puppeteer, Flutter 🌐 Modern, responsive frontends & robust backend systems 🔌 API development & third-party integrations ⚡ Automation tools, WhatsApp messaging platforms, custom payment gateways I deliver clean, maintainable code and design systems that perform flawlessly under heavy load. Passionate about building software that scales with your business needs. 🏆 Other projects I’ve developed include: WhatsApp automation systems serving thousands of businesses Custom multi-payment gateways for SaaS platforms Cross-platform desktop apps (Electron) for large-scale clients Web3 integrations using Solidity, Ethers.js, Hardhat & MetaMask Each project is built with a focus on security, performance, and long-term scalability, ensuring it meets the highest standards of quality.

🏆 Your project deserves an engineer who’s not just skilled at writing code, but passionate about building scalable, end-to-end solutions. I don’t just complete tickets; I solve complex architectural problems and take ownership of the entire product lifecycle, from the frontend UI down to the server deployment. 👋 Who I Am & My Experience I am a Full-Stack Mobile Architect and DevOps Engineer with 7 years of total software engineering experience, including over 4 years of professional experience building modern, secure applications. My expertise lies in bridging the gap between high-performance cross-platform apps and robust server infrastructures. ╰┈➤ Throughout my career, I’ve successfully modernized legacy Flutter codebases, resolved critical environment-specific URI exceptions, and engineered complex multi-tenant backends using edge functions and relational databases. ➜ Core Services I Offer As your complete technical partner, I provide end-to-end development solutions: 📱 Cross-Platform Mobile Development: Delivering seamless iOS, Android, and Web experiences using Flutter. ⚙️ Backend Engineering: Building secure, scalable REST APIs and server logic with Python and Django. ☁️ Cloud Infrastructure & DevOps: Automating deployments and managing environments via Linux, Docker, and CI/CD pipelines. 🔧 Legacy App Modernization: Upgrading legacy frameworks, refactoring outdated architectures, and resolving build-path conflicts. 🔒 System Architecture: Designing custom backend access controls tailored for specific stakeholder and operational needs. 🥇 What I Bring to the Table 💥 Impactful Results: I engineer comprehensive backend solutions, including seamless authentication and serverless edge functions, designed to perfectly mimic and improve upon previous app behaviors. 💎 What Sets Me Apart: I handle both the visual polish of a Flutter frontend and the complex, under-the-hood Docker deployments. You get the expertise of two specialized developers in one. 🤝 Seamless Collaboration: Operating in the UTC-3 timezone, I maintain highly responsive communication. I am deeply experienced in validating peer code, organizing backend permissions, and ensuring critical weekend delivery targets are consistently met. 🛠️ My Technical Toolkit 💎 Frontend/Mobile: Flutter, Dart 🧑🏻‍💻 Backend: Python, Django, Supabase, JavaScript (Edge Functions) ⚙️ DevOps & Infrastructure: Linux system administration, Docker, CI/CD orchestration 💼 Workflow & Management: Git version control 🤝 Let’s Build Something Amazing Together 🤝 I’m here to deliver quality, value, and a highly collaborative approach to meet your engineering needs. Let’s turn your ideas into a scalable reality!