Recent work: a full RLS security audit and hardening pass on a production Supabase backend. A 410-test Playwright suite on a Next.js portal. A Postgres outbox pattern for reliable async side effects. 100% Job Success across 22 jobs. Most clients come back for a second project. I lead with specifics because anyone can claim "clean code and great communication." Specifics are harder to fake. I'm a senior Flutter developer (10+ years mobile, 7+ in Flutter) based in the Netherlands, working with startups and scale-ups across Europe. Three ways I'm probably different from the other profiles you're comparing: 1. I'm genuinely full-stack. Flutter is my core, but I regularly own the whole system: Next.js portals, Supabase/Postgres (including RLS security audits and migrations), Hono/Bun backends, CI/CD, TestFlight releases. You don't need a second freelancer for the backend. 2. My AI work is in production, not in demos. LLM APIs, semantic search with pgvector, RAG pipelines shipped as real features users pay for. If you want AI that's actually useful in your product rather than a chatbot bolted on, I've done it and can show you. 3. I work like it's 2026. I run AI-assisted, multi-agent development workflows daily, which means senior-level architecture decisions delivered at a pace solo developers couldn't match a few years ago. You get speed without the usual speed/quality trade-off. What I've shipped: fintech and crypto apps, large-scale e-commerce, enterprise onboarding, social apps, inspection/field-service SaaS. Architecture through App Store submission, every time. Stack: Flutter & Dart · Riverpod & BLoC · Firebase & Supabase · PostgreSQL + pgvector · TypeScript / Next.js / Hono / Bun · OpenAI & Anthropic APIs · Fastlane, CI/CD, Playwright Where I fit best: 📱 Greenfield builds - architecture to App Store 🤖 AI features - summaries, semantic search, chat, recommendations 🚑 Rescues - performance problems, state-management messes, codebases left behind by a previous dev 🧪 Hardening - testing, refactoring, security audits, code review How I work: clear, proactive communication, you'll never wonder where things stand. Documented code with tests, because whoever maintains it after me deserves that. And I don't need hand-holding: point me at a problem and I'll own it end to end. If your project needs someone who can think about the whole product, not just the Flutter layer, send me a message and tell me what you're building.

John Morrison is a professional software engineer with over 20 years of experience. He has successfully led the creation and growth of industry awarded software titles for both desktop and mobile applications.

I've been working as a lead developer for 20 years. Have strong skills in all modern web technologies - top 10% in all corresponding Upwork tests. Looking for challenging long-term contracts. Understand critical deadlines and specialize in saving employers' ****s (I mean reputations).

I am a creative and innovative thinker who craves to solve challenges. A motivated team player who consistently strives to develop solutions for complex problems. I aim to thrive in a challenging environment by utilizing my technical skills & expertise towards the development and implementation of new ideas, contributing to the growth of the organization. We are experts in • iOS Application Development • Python,Python Framework(django) • version controlling (SVN,GitHub), • API(facebook API,youtube API), • HTML,HTML5,CSS,CSS3,Bootstrap(responsive designing ), • Ecomerce Application(OpenCart) • Specially ERP work Python Based(OpenERP

Stop building AI demos. I ship production-ready features with the rigor of an ex-Uber engineer. Full-stack AI: iOS/Swift + Python + LLM evals & guardrails. WhisperBoard (50K+ downloads, 4.8★). mcp-browser-use (850★). WHAT I DELIVER: • Production AI systems — not prototypes that break in prod • Evals, guardrails, and monitoring built in from day one • Handover-ready code in your repo, not spaghetti AI • iOS/Swift frontends + Python/agentic backends SIGNATURE PROJECTS: • WhisperBoard — On-device voice transcription app, 50K+ downloads, 4.8★ rating • mcp-browser-use — Open-source browser automation for AI agents, 850+ GitHub stars • Uber — Engineered critical wallet functionality used by millions globally • nu.nl — Core features for the Netherlands' highest-traffic news application 100% Job Success • Top Rated • $90K+ earned on Upwork

I take pride in delivering my partners the best value and work by building innovative applications and user-centric solutions. My expertise spans data science, machine learning, and full-stack development, allowing me to create intelligent solutions that enhance user experiences and drive business value. I am dedicated to making partnerships and strive towards providing best value for money. Programming Languages: Python, JavaScript, Go, Swift Machine Learning Frameworks: TensorFlow, PyTorch, scikit-learn LLM Expertise: Google Gemini, GPT-4, OpenAI API, Hugging Face Transformers Development Skills: Natural Language Processing (NLP), Computer Vision, Data Analysis, Model Training and Optimization Lambdas, Data Structures, Multi-tiered Architecture, Web Socket Programming Data Analysis Tools: Databricks, pandas, numpy, scikit-learn, Matplotlib, Seaborn Frameworks: Flask, Django, Gin, Express, Next.js, Nuxt.js, Angular, Swift UI Database Systems: SQL Server, MySQL, PostgreSQL, MongoDB, Firebase Store Cloud Services: Azure, AWS, Google Cloud, Firebase, Supabase Architectural & Design Skills: MVC, MVVM Design Patterns, OOP, Data Structures and Algorithms, Multithreading and Multiprocessing Tools & Applications: Jupyter Notebook, MS Visual Studio, Docker, Atom Third-Party Integrations: Twilio, OpenAI Assistants, Google Cloud Vision, Plivo, Zerobounce, Authorize.net, Stripe, HubSpot, Mailchimp, SendGrid, CallRail, New Relic, Mixpanel, MS Teams, Web hooks, Integry, Zapier, IFTTT, JIRA Source Control: Git, GitLab AI-Powered Applications: Expertise in developing applications using LLMs for tasks such as text generation, summarization, translation, and conversational agents Models: Google Gemini, GPT-4, Ollama, Llama 3, Mistral, Open Hermes Like what you see? Let's chat about building that project you've been wanting to build. Best Ali

If you are looking for a motivated, safe set of hands to take the weight of your project off your shoulders and work with you to get the job done right, then let’s have a chat. Here’s how: 1. Send me an Upwork message 2. On Upwork message, click on the green “Schedule a meeting” button, choose 30 minutes and I will confirm a time slot. 3. That way we can hop on a strategy call to discuss your project further and make sure we are a great fit together. I lived in Drexel HIll, PA. I am a motivated and creative US based freelancer with over 10 years of successful freelancing in multiple areas of Web & Mobile development. I have experience in ReactJS, NextJS, NodeJS, AngularJS, JavaScript, Laravel, CodeIgniter, Cake PHP, Rest APIs, and WordPress. Expert in React Native Mobile Applications Enterprise level Web | Mobile applications ✔ Detailed experiences are: 1) Backend Development • PHP - Laravel MVC, CodeIgniter, Cake PHP • Node.js - Express, Socket.io, Meteor • Python - Django, Flask • MYSQL, MongoDB, NoSQL, Firebase 2) Front-end Development • Angular, React.js, NextJS, Vue.js • CSS/SCSS, HTML, JavaScript, Jquery 3) iOS | Android app Development • Swift, Java, Kotlin, React Native, Ionic, Flutter • RxJava, RxSwift • MVP, MVVM My priorities are - - Best quality - Bug-free - Delivery in a timely manner - Developing an app, testing it, and making sure users won't have any problems when using the final product; - Helping to choose the best tools for analytics, testing, marketing, reporting, and more.

Offering consulting & coaching to help turn YOUR APP IDEA into a growing BUSINESS 3,700+ Upwork Hours | ⭐️ Only 5-Star Reviews | 💯 100% Job Success | 👑 Top Rated Plus 🚀 MVP Creation & Launch 🪩 Mobile Boilerplate for MVPs (saves $$$) 💙 Cross-Platform Flutter Apps ⏰ Daily updates 🔥 Firebase | SwiftUI | Flutter 🎓 B.S. in Computer Programming 👫 Team Expansion & Hiring Support 🇺🇸 Texas-raised, based in the U.S., available worldwide "Josh ... [D]isplayed a great ability to bring my ideas into life... I'd definitely feel comfortable suggesting him to anyone, even my closest friends." ⭐️ 5-Stars | Cody | Tailored Trainer App "I’ve had some bad experiences with other devs but he [Josh] gave me faith in the freelancers realm" ⭐️ 5-Stars | Daquan | Featrrr App "Everything was completed to the highest possible standard and met every single requirement." ⭐️ 5-Stars | Mitch | EIHLFL App "Josh was friendly, professional and offered excellent advice. I started the contract with a smaller implementation and kept Josh on to complete the entire project." ⭐️ 5-Stars | Ruby | Good Chat App I specialize in end-to-end mobile app creation: from napkin sketch to App Store launch. Whether you’re a solo founder or a growing team, I’ll help you define your MVP, design a scalable architecture, and ship your first release. You’ll get daily updates, transparent progress, and a partner who treats your product like his own. Ready to turn your app idea into a business? Message me on Upwork to set up your consultation. Best 🍻, Josh B. *** Note: I am not accepting operational positions at this time, but I am available for consultations on how to get your product to market. 30-60 minutes with me can save you significant money / time down the road.

Your business’s secret weapon - I work with ⭐ Fortune 500s, Start-Ups, and Individuals ⭐ to navigate technologies like AI, blockchain, and complex software infrastructure, daily. Lead @ STAYKool Productions, Co-founder of Squizz Digital Signage (squizz.tv). I often serve as a domain expert, a leader, and a keystone member of any team I integrate with. During my decade+ of experience, I have designed, built, and released multiple SaaS products, individually and as part of a larger team. 📈 I can help your business succeed by: - Serving as an interim or fractional CTO for your growing business. - Providing technical or software development support. - Updating your Android, IOS, or Cross-platform app. - Performing technical due diligence. - Set up payment gateways using services like Stripe, Square, or BrainTree. - Integrating ChatGPT (or other forms of AI) into your business processes and workflows. - Creating sales and marketing funnels, that convert. - Orchestrating social media and Google Ads campaigns - which tug on heartstrings. - Identifying and addressing processes, and shortfalls inhibiting growth. - In addition to any other Admin or IT-oriented consultation roles. 🦄 A wearer of many hats in my own businesses and for past employers, I leverage that experience, in tandem with my professional contacts/team, to efficiently grow your business and increase revenue. "Growth Hacking", if you will. Please ask questions! I'm happy to be a part of your team, even if it is for a short time. # Keywords: Multi-agent AI, Generative AI, GPT-based models, Large Language Models (LLMs), System Design, Microservices, Kubernetes, A/B Testing, AI-Powered Web Applications, Intelligent Systems, Automated Content Generation, AI-Driven Analytics, Web Security, Automated Testing, Web Accessibility, Big Data, Feature Engineering, Model Training, Data Science, Data Analysis, Data Visualization, Data Cleaning, Python, Django, Flask, Node.js, Express.js, ASP.NET Core, Laravel, Go, Java, C#, TypeScript, React.js, Angular, Vue.js, Serverless Architecture, Cloud Computing, Docker, CI/CD, RESTful APIs, Single Page Applications (SPAs), NoSQL, MongoDB, Elasticsearch, PostgreSQL, Oracle SQL Server, MySQL, SQL, GitHub, GitLab, Bitbucket, Git, UI/UX Design, Responsive Web Design, Problem-Solving, Analytical Thinking, Object-Oriented Programming (OOP), Software Development Life Cycle (SDLC), Agile Methodologies, Scrum, Clean Code, Debugging, API Development, Communication Skills, Team Collaboration, jQuery, Bootstrap, Material-UI, HTML5, CSS3, Sass/SCSS, Less

Hi, I’m Jorge, a senior mobile app developer with over 8 years of experience building scalable, user-friendly apps for some of the world’s most recognized brands, including GrubHub, Subway, Wendy’s, and even NASA. Whether you need a custom app or a quick-to-market solution, I specialize in delivering cross-platform apps using Flutter, FlutterFlow, Kotlin, Swift, and native Android/iOS technologies. What I Bring to Your Project 1️⃣ Enterprise-Grade Expertise I’ve delivered apps for Fortune 500 companies that handle millions of users daily, with features like API integrations, real-time tracking, and payment gateways. My past work includes restaurant apps, healthcare solutions, and educational tools. 2️⃣ Cutting-Edge Features From geolocation and AI-powered functionality to secure payment systems and ADA compliance, I build apps that are intuitive, secure, and performant. I’ve developed: Real-time tracking systems (Washly - on-demand car wash app). QR code and payment verification (GrubHub Enterprise SDK). AI-powered micro-learning experiences (MindGarden - gamified learning app). 3️⃣ Seamless Integration and Scalability I ensure apps are built to scale, working seamlessly with Firebase, AWS, MongoDB, and more, so your app grows with your business. What You’ll Get Working With Me 🚀 End-to-End App Development: I handle everything from concept to post-launch support. You only need to provide feedback and focus on your business goals. 🚀 Clear Communication: I explain technical concepts in simple terms and provide regular updates. 🚀 Proven Reliability: I deliver on time and on budget, with a track record of 100+ completed apps and repeat clients. How I Set You Up for Success I work collaboratively to ensure your app aligns with your vision and achieves your goals. I streamline development so you receive a high-quality app quickly and stress-free. I prioritize security and performance, building apps that users love and trust. Let’s Build Something Great I’m here to help you create an app that stands out, connects with your audience, and drives results. Invite me to your project or send a message to discuss how we can work together.