I help startups launch with confidence by acting as the bridge between development and an intuitive user experience. My experience includes collaborating effectively with developers, designers, product teams, and management to identify issues, improve usability, and help deliver polished products. I specialize in clear, reproducible bug reporting and enjoy helping teams create intuitive, user-friendly websites, apps, and software. I write detailed issue tickets with reproduction steps, screenshots, video recordings, logs, and supporting documentation that allow developers to quickly understand and resolve problems. I thrive in the fast-paced environment of early-stage startups, where adaptability, communication, and attention to detail are essential. Devices: • iPhone 16 Pro Max • Google Pixel 6a • iPad Desktop: • MacBook Air (macOS) • Chrome DevTools • Safari • Firefox

✅ Swift ✅ Kotlin ✅ SwiftUI ✅ Flutter ✅ Objective C✅ ReactNative Thanks for checking my profile. I am an experienced mobile app developer with experience in developing high-quality, user-friendly apps for both iOS and Android. With over 8+ years of experience in app development, I have a strong background in Java, Kotlin, Swift, Objective-C, and Dart programming languages. I have created and improved applications for clients in areas of social networking, education, video streaming, entertainment, self-help, fitness, lifestyle, commerce and more. How I can help you: ✯ Build an app from ideation to MVP and beyond ✯ Revive, update or fix existing applications in need of care and feeding ✯ Integrate new or existing applications into popular back-ends like Firebase or AWS ✯ Get previously stalled app development efforts over the finish line ✯ Consult on feature possibilities, App Store guidelines, and monetization strategies In addition to my technical skills, I am a strong communicator and enjoy working with clients to understand their vision and bring their ideas to life. I am organized and detail-oriented, and take pride in delivering projects on time and to the highest standard. I am excited to bring my skills and experience to your project and help you achieve your goals. Let's work together to create a successful app that meets the needs of your users on both iOS and Android platforms.

🚀 I turn complex iOS projects into polished, scalable apps that users love. Expert-Vetted iOS Architect with $700K+ earned and 11,000+ hours building production apps for startups and enterprises worldwide. My apps have shipped to millions of users across healthcare, fintech, and social platforms. 📣 "Roberto has regularly gone above and beyond to help us get through challenging milestones. A great attitude and communication skills went a long way." — Gil Hagi, TastyTech LLC WHY CLIENTS CHOOSE ME: ✅ Expert-Vetted & Top Rated Plus | 100% Job Success ✅ 10+ years Swift, SwiftUI, UIKit, MVVM, VIPER ✅ Seamless team integration — I join standups, do code reviews, mentor juniors ✅ Delivered apps for Mozilla, Cornerstone, Idera, and 50+ startups WHAT I DELIVER: • Full iOS development: Swift, SwiftUI, UIKit, Combine • Architecture design: MVVM, VIPER, Clean Architecture • Performance optimization & code audits • CI/CD pipelines, TestFlight, App Store deployment • Team augmentation & technical leadership Ready to build something great? Send me a message to schedule a FREE 15-min discovery call.

I build AI-native SaaS web and mobile applications, specializing in ETL pipelines, data extraction, web scraping solutions, automation systems, and REST APIs using React, React Native, Next.js, Python, Node.js, TypeScript, Tailwind CSS, Supabase, Claude API, OpenAI API. Clean code, production-ready project structures, mobile-first, full responsive interfaces, deployed to the cloud(Vercel, Netlify, DigitalOcean, AWS, etc.) I specialize in building ad scaling high-performance web and mobile applications, with deep expertise in e-commerce platforms, AI-powered tools, and intelligent chatbots. From concept to production, I design and develop scalable solutions that integrate AI to enhance performance and deliver seamless user experiences. With strong full-stack expertise, I can rapidly transform your idea into reliable, production-ready products and tackle complex technical challenges with confidence. I also design and build scalable data systems that extract, process, and deliver clean, reliable data - even from complex, protected, and unstructured sources. From high-volume scraping pipelines to fully automated workflows, I create production ready solutions that run continuously, handle scale, and integrate directly into your business systems. I use Claude Code as my primary development workflow - it allows me to deliver production-quality applications 2-3x faster than traditional development without sacrificing code quality. What I build: ✅ React / Next.js development (SEO-friendly, fast-loading app) ✅ React Native Expo Mobile Apps for iOS and Android ✅ Backend development with Python, Node.js, Express.js, and NestJS ✅ TypeScript-first full-stack applications ✅ AI-Powered SaaS & MVP Development (Claude, OpenAI) ✅ Web scraping, data extraction, web crawling, data mining ✅ Browser automation, workflow automation, business process automation ✅ Data pipelines, ETL workflows, large-scale data processing ✅ API integrations, API scraping, reverse engineering ✅ Data cleaning normalization, deduplication, validation, enrichment ✅ Excel, CSV, and Google Sheets automation ✅ Dashboards, reporting systems, analytics pipelines ✅ Cloud deployment and automation infrastructure(AWS, Google Cloud) My skills include: ⚙️ Frontend Development: Next.js, React, TypeScript, JavaScript | Tailwind CSS, SCSS, CSS3, HTML, HTML5 | GSAP, Chart.js, AG Grid, Three.js, Bootstrap ⚙️ Mobile App Development: React Native, Expo, iOS Development, Android Development ⚙️ Backend Development: Python (Django, Flask, FastAPI) | Node.js (Express.js, Nest.js) | REST APIs, GraphQL, OpenAI & Claude & Vertex &Gemini & Kie AI API Integration ⚙️ Shopify & Automation: Shopify themes & Shopify apps | API integrations(payments, CRMs. third-party services) ⚙️ Web Scraping & Data Extraction: Playwright, Puppeteer, Selenium | Requests, httpx, curl_cffi, tls_client | Custom header and cookie management, CSRF and token handling | Reverse-engineered private APIs and GraphQL endpoints | Scrapy, extensions | Beautiful Soup, lxml, parsel | Persistent contexts, cookie reuse, session warming | Pagination, infinite scroll, lazy-loaded content ⚙️ Anti-Bot & CAPTCHA: Cloudflare, DataDome, PerimeterX, Akamai Bot Manager, Kasada | hCaptcha, reCAPTCHA v2/v3 | 2Captcha, Anti-Captcha, CapSolver integration ⚙️ Proxy & infrastructure: Bright Data, Oxylabs, Smartproxy | Residential, mobile, ISP, and datacenter pools | Custom rotation logic with health checks and ban detection | Distributed scraping across multiple workers, queues, and regions | Dockerized scrapers, autoscaling on Cloud Run ⚙️Excel, CSV & Google Sheets Automation: Excel and CSV reports with openpyxl, xlsxwriter, pandas | Google Sheets API and gspread - live dashboards, auto updating reports, tow way database sync | Apps Scripts ⚙️ Database & Infrastructure: Supabase, PostgreSQL, MongoDB, MSSQL | Docker, AWS, Azure, Heroku | GitHub, CI/CD pipelines ⌚ How projects work for web scraping and data extraction: Sample first. I usually start with a small sample run - a few hundred records or a single category - delivered in a few days so you can validate quality before committing to the full build. From there, we move into the production system with clear milestones and fixed scope. Delivery goes straight into your environment" S3, GCS, BigQuery, Postgres, a Google Sheets, or a CSV How I work; ✅ I'll tell you in the first conversation if it's fit. if it's not, I'll say so and point you elsewhere ✅ Claude Code as my primary workflow ✅ Clear communication and steady updates ✅ Realistic estimates ✅ Code that another developer can easily pick up Keywords Next.js, React Native, Node.js, TypeScript, Supabase, PostgreSQL, BigQuery, SaaS, Web development, Back-end development, Front-end Development, Expo, web scraping, data extraction, automation, Python, Playwright, Selenium, Puppeteer, Scrapy, scraping expert, data pipelines, ETL, API integration, API reverse engineering, Excel, Google Sheets, CSV, Claude, OpenAI, RAG

Need a developer who can ship fast, clean, production-ready apps—and also automate the boring work with AI? I’m Francis, a Top Rated developer and project lead with 8+ years (going on 9) of experience and 1,100+ Upwork hours, having delivered 50+ projects (including Fortune 500 collaborations) with a 100% on‑time track record. I help clients with: Modern Web Apps (Full Stack) React / Next.js, Vue, or vanilla JS frontends Node.js / PHP (Laravel / WordPress) / Python backends REST APIs, authentication, dashboards, admin tools High-Performing WordPress & E‑Commerce Custom themes & plugins, Gutenberg blocks, performance optimization WooCommerce & Shopify builds, migrations, and conversion‑focused UX Fixing complex bugs, refactors, speed & Core Web Vitals work Mobile & Cross‑Platform Apps React Native / Expo or hybrid stacks for iOS and Android API-driven mobile apps connected to your existing backend or CRM MVPs, prototypes, and production-grade releases AI & Automation (LLMs, Workflows, Integrations) ChatGPT / Claude / ChatLLM–powered chatbots, assistants, and internal tools AI knowledge bases, RAG‑style search over your docs, AI summaries & insights Business process automation: CRM, email, billing, forms, and data sync AI‑assisted coding, automated reports, and internal dev tooling HOW I TYPICALLY WORK 1. Discovery & Strategy We clarify your goals, scope, budget, and timeline so we know exactly what “success” looks like. 2. Design & Architecture I propose a clear tech approach (stack, integrations, data model, AI usage when relevant) that balances speed, reliability, and cost. 3. Build & Iterate Short, focused milestones with visible progress: working features, not endless documents. 4. Launch, Test & Optimize Automated and manual testing, performance tuning, and post‑launch support so your app runs smoothly under real traffic. RECENT TYPES OF PROJECTS Full Stack Web & AI AI knowledge‑base chatbot for a research organization (LLM + RAG over reports and briefs). State Bill Grading Tool using LLMs to analyze legislation and output structured scores. AI news summarization pipeline with a live ticker UI pulling from multiple feeds. WordPress / E‑Commerce / SaaS Custom WordPress builds and rebuilds for SaaS, agencies, and content sites. WooCommerce and Shopify stores optimized for conversions and speed. Multi‑site WordPress ecosystems with custom dashboards and integrations. Mobile & Internal Tools Mobile MVPs for service businesses (booking, user accounts, push notifications). Internal dashboards and admin panels for operations, analytics, and content management. WHY CLIENTS HIRE ME (AND KEEP COMING BACK) Top Rated on Upwork – proven delivery and client satisfaction. Strong communicator – clear updates, no surprises, I ask the right questions. Business‑minded – I care about outcomes (revenue, engagement, efficiency), not just code. Versatile – web, full stack, mobile, and AI automation, so you’re not juggling 4 different freelancers. Reliable – I respect deadlines, document my work, and make maintenance easier for you or your team. CORE TECH & TOOLS Frontend & Mobile React, Next.js, React Native / Expo JavaScript (ES6+), TypeScript (if needed) HTML5, CSS3/SCSS, Tailwind, Bootstrap Backend & APIs Node.js (Express), PHP (Laravel, WordPress), Python REST APIs, webhooks, third‑party integrations (CRMs, payment gateways, marketing tools) CMS & E‑Commerce WordPress (custom themes/plugins, Gutenberg) WooCommerce, Shopify Webflow, Squarespace, Wix (for marketing sites & quick launches) AI & Automation ChatGPT, Claude, ChatLLM Desktop, GitHub Copilot AI chatbots, RAG search, summarization & grading, internal AI tools Workflow automation with CRMs, email tools, and internal systems DevOps & Workflow Git, GitHub, GitLab, Bitbucket AWS, WPEngine, SiteGround, GoDaddy Docker (where appropriate), CI/CD concepts Jira, Trello, Asana, ClickUp for project tracking WHAT TO DO NEXT If you’re looking for a reliable, senior developer who can handle: A new web or mobile app from idea to launch A complex WordPress / Shopify / WooCommerce project Or AI & automation work integrated into your existing stack Send me a message with: A short description of your project Your ideal timeline Any examples or references you like I typically respond within a few hours and can often start with a short paid discovery or audit so you get value quickly before committing to a larger engagement. Let’s build something great.

I strive for bringing my best self. The best way to do this is to keep learning every day. I choose mobile development as my profession because I love challenging myself to do better. My casual day consists of learning, developing and reading. I like to spare time for my hobbies which brings me joy and rejuvenation. My career objective is to do what I like. Moreover, I wanted to be environment independent while doing it. Therefore I choose to work as a freelancer. This year is my seniors at Istanbul University, Bachelor of Computer Engineering. I have a solid foundation in Computer Science practises such as data structures, algorithms, writing clean & maintainable code, MVVM pattern, agile and many more. I’ve been developing iOS apps for 4+ years. I used to work with UIKit mostly. Although, I completely switched to SwiftUI when its version 2 came out. I have over 30 app repositories in my Github account. They’re free for anyone to learn and improve themselves. I have developed several apps for my clients, and I published my project Entrip in App Store a year ago and I sent 12 software updates.

With 20+ years in software development and technical leadership, I work with startups, agencies, and established companies that need more than basic coding help. I bring senior-level experience across AI development and integration, full-stack development, cloud infrastructure, software architecture, payment systems, performance optimization, and technical team leadership. I have worked with clients and organizations including McDonald’s, Walmart, U.S. Government agencies, Lyft, Hyundai Motors, and large real estate companies. My core strengths include: - Full-stack development with Node.js, PHP, C#, C++, JavaScript, Vue.js, React, Laravel, Symfony, Express, HTML5, CSS, and modern web technologies - AI Systems and sytem integration - SaaS, CRM, dashboard, API, e-commerce, and business application development - AWS, Azure, DigitalOcean, Linode, Linux/Unix server setup, deployment, security, and infrastructure maintenance - Database design, optimization, administration, and performance tuning - Payment processor integrations and PCI-aware architecture - Startup consulting, workflow organization, technical planning, and development team management - Application audits, code reviews, scalability planning, and performance improvements Why clients hire me: I am not just a developer who waits for instructions. I can look at your product, understand your business goals, identify risks, recommend better solutions, and execute. Clients usually come to me when they need someone who can: - Build a product from idea to launch - Fix or modernize an existing application - Improve slow or unstable software - Design scalable backend architecture - Manage or support a development team - Integrate payments, APIs, CRMs, dashboards, or third-party systems - Set up secure cloud infrastructure - Act as a fractional CTO or senior technical advisor I focus on practical, business-driven software. Clean architecture, reliable infrastructure, security, scalability, and maintainability matter — but so do speed, budget, and getting the right version of the product launched. Whether you need hands-on development, technical leadership, or a trusted consultant to review your current system, I can help you move faster with fewer mistakes. Send me a message and tell me what you are building, fixing, or trying to scale. I’ll help you figure out the best technical path forward.

I'm a very experienced mobile app developer and architect using MAUI / .NET for Mobile (iOS & Android) (formerly Xamarin / Xamarin.Forms) framework, I have been working over 10 years helping businesses to ship delightful app experiences, currently I'm a Microsoft MVP helping communities and companies to improve their skills on mobile development and converting ideas into awesome experiences also I have been Xamarin Certified Mobile Developer since 2013.

Patrick Childers is a technology leader, serial entrepreneur, and full-stack software developer with a deep skill set in healthcare, fintech, mobile applications, video games, and other emerging and innovative technologies.

I build production-ready LLM chatbots and high-speed APIs that move business metrics. 15+ years in Python/FastAPI and data platforms. Led AI and backend at venture-backed and 🏅Fortune-500 products. 🏆 Launched LLM chatbot at GeoDB → new revenue vertical; deployed image generator to boost engagement. 🏆 Cut infra costs 8k→1k €/mo and halved annual budget 180k→90k by smart architecture & consolidation. 🏆 Built ETL pipelines (PyArrow/DuckDB) turning reports from days→minutes; scaled engine 1GB→4TB. 🏆 Hyperice (F500): WebSocket + FastAPI backend for group sessions → +15% engagement and $2M in subs revenue impact. What I deliver: 📦 LLM Chatbots & RAG: ChatGPT/Claude integration, LangChain/LangGraph, retrieval, tools, evals, guardrails. 📦 FastAPI Backends: Low-latency REST/WebSocket services, auth/RBAC, queues, testing, observability. 📦 Data Pipelines/ETL: Airflow jobs, PyArrow/DuckDB, PostgreSQL/MongoDB, analytics-ready models. 📦 Cost & Scale: Docker/AWS, async IO, caching, perf tuning, pragmatic infra that pays for itself. 🛠️ Stacks & keywords: Python, FastAPI, LangChain/LangGraph, OpenAI/Anthropic, RAG, Vector DBs, WebSockets, PyArrow, DuckDB, Airflow, PostgreSQL, MongoDB, AWS, Docker. How we start (low-risk): 🟢 48-hour Diagnostic – clarify use-cases, data, and constraints; mini-POC or architecture plan. 🟢 Milestone Plan – delivery roadmap with success metrics (latency, CTR, retention, cost). 🟢 Build & Ship – iterative releases with tests, dashboards, and handover docs. Results I optimize for: faster CX, higher conversion/retention, lower infra cost, clear analytics. 👉 Ready to move from idea to impact? Invite me with 2–3 lines about your users and goal. I’ll propose a concrete plan and timeline.