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Building scalable backend systems, cloud infrastructure, AI integrations, and full-stack applications with AWS, FastAPI, Django, and Flutter. Over the past few years, I’ve worked across full-stack development, cloud infrastructure, automation, and AI integrations — helping clients ship faster while keeping systems reliable, maintainable, and production-ready. My work goes far beyond “building apps.” I help companies design and scale real systems: • AI-powered platforms and internal tools • Automation pipelines and workflow orchestration • High-performance backend APIs • Real-time systems and event-driven architectures • Mobile and web applications • Cloud infrastructure on AWS • Scalable async processing and integrations I’m especially strong at connecting product thinking with engineering execution — turning ambiguous business ideas into clean technical solutions that can actually scale. Tech stack includes: • Python (FastAPI, Django, DRF) • AWS (ECS, Lambda, SQS, DynamoDB, RDS, EventBridge, CloudWatch) • Flutter (iOS, Android, Web) • PostgreSQL & DynamoDB • OpenAI / Claude / AI-assisted workflows • Docker & CI/CD pipelines • REST APIs & third-party integrations Recent work includes: • AI-powered database querying systems (natural language → SQL / DynamoDB) • Horizontally scalable trading infrastructure on AWS • Real-time financial alert processing systems • Mobile apps with complex business workflows • Internal AI tools and automation platforms I move fast, communicate clearly, and care deeply about building systems that are robust in production — not just impressive demos.

⚡ 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

⚠️ 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 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.

My portfolio: bernardonp.dev I am a software developer with over 6 years of experience, specializing in mobile app development for iOS and Android, focusing on Flutter and Node. I have contributed to the creation of several successful apps, including projects with hundreds of thousands of active users. I have solid experience in developing robust, clean, and scalable systems, always prioritizing the delivery of high-performance products with excellent user experiences. In addition to app development, I also have experience in game development using Unity (AR and VR), combining my passion for games with the creation of complex and creative systems. Experience with CI|CD, AWS, DevOps, Firebase, MongoDB, SQL, Stripe, Native... I study AI and I'm getting deeper and deeper into this area! I am flexible with my work schedule and fully committed to meeting deadlines, always focused on delivering solutions that add value to the business and provide users with a fluid and intuitive experience. Let's bring your idea to life!

I am a Senior Computer Graphics Programmer and 3D Generalist operating at the intersection of high-performance coding, Generative AI, and artistic visualization. Not relying solely on abstractions, I have deep low-level expertise, having built my own WebGL rendering engine from the ground up. This foundational knowledge makes me exceptionally effective with frameworks like Three.js. I know what's happening under the hood, but I am equally comfortable building custom, lightweight solutions when performance is paramount. My skillset covers the entire pipeline, from server-side logic to raw shader programming: Graphics Programming: Expert in raw GLSL, vanilla WebGL, and Three.js. Whether you need a standard framework for rapid development or a custom lightweight engine for speed, I can adapt to the tech stack that best fits the project. Full Stack Development: I provide end-to-end web solutions, ranging from backend architectures using Node.js or PHP, to robust frontends built with React, or vanilla Typescript/JavaScript. AI & Hybrid Workflows: I build advanced pipelines that blend 3D precision with Generative AI. This includes developing custom Python nodes for ComfyUI to optimize product rendering and create flexible generation workflows. 3D Generalist: Extensive background in architectural and product visualization/modeling, allowing me to bridge the gap between technical constraints and visual fidelity. I prefer building clean, modular, and efficient solutions to solve complex visual problems.