As a seasoned programmer, I bring a wealth of technical expertise and a proven track record in native and cross platform mobile app development for iOS and Android platforms. My skills encompass a wide array of functionalities, including Push and APNS, Geo-fencing, Payment processing (card readers), maps, mobile device management, QR code scanners, Blockchain and integrations with services such as Paypal, Stripe, and Parse. In addition to mobile and backend development, I have hands-on experience integrating AI-powered solutions into applications, including intelligent chatbots, recommendation engines, predictive analytics, Computer Vision and automation workflows. I have worked with modern AI tools including Claude, APIs and frameworks to enhance user experience through personalization, smart insights, and real-time decision-making. Listed below is an overview of my skills and the tools I have worked with. Languages : Flutter, FlutterFlow, Dart, React.js, React Native, SwiftUI, Objective-C, Kotlin, T-SQL, C#, JavaScript (ES6+), HTML5, Swift 5+, CSS3, TypeScript, Python, JSON Frameworks : Core Foundation, iOS SDK, Core Data, Core Video, Core Location, MapKit, Social Framework, Core Media, AVAudioEngine, Flutter SDK, Material & Cupertino Widgets, Jetpack Compose (basic) Libraries / APIs : Core Animation, Facebook SDK, jQuery, Google Maps SDK, AFNetworking, CocoaPods, SQLite, Core Graphics, SpriteKit, Parse iOS SDK, Mixpanel SDK, MailChimp API, Node.js, Supabase, Firebase (Auth, Firestore, FCM, Crashlytics), REST APIs, GraphQL, WebSockets Tools : iOS Simulator, Apple Xcode, Android Studio, Visual Studio, VS Code, Git, Bitbucket, GitHub, SVN, Postman, Firebase Console, Fastlane, TestFlight, MailChimp, Jira Platforms : iOS 15–26, Android 10–15, Flutter Mobile (iOS & Android), Flutter Web, Flutter Desktop (Windows, macOS, Linux) CMS / ERP / CRM : Django, Django REST Framework, FastAPI, Python, PostgreSQL, Redis, Celery, REST API, API Integration, SaaS Development, Microservices, AWS, Docker, Headless CMS, Custom Admin Dashboard, Odoo, AI Integration, OpenAI API, LangChain, LLM Integration Web / Backend Tools : jQuery, Yahoo UI Library, AngularJS, SQLAlchemy, Peewee, Motor, PyMongo, Django MongoDB Engine, Express.js, NestJS Server end : Azure, Firebase, Google Cloud Functions, AWS (EC2, S3, Lambda), Docker, CI/CD Pipelines Paradigms : Agile Software Development, Scrum, Kanban, MVC, MVVM, Clean Architecture Misc : iOS Video, Backend Integration, Stripe Payments, PayPal, Fintech, Push Notifications, Real-time Sync, Barcode & QR Code (QR Code, DataMatrix, Code39, Code128, PDF417, AZTEC, UPC, EAN) Storage : Microsoft SQL Server, Firebird, MySQL, SQLite, MongoDB, DynamoDB, Redis, MemSQL, Firebase Firestore, Cloud Storage Core specialization in: - Fintech apps- Payments apps, digital wallets, Loyalty rewards, stock trading, referral - Utility apps- Call recorder, keyboard, food delivery - Communication- social networking, audio/video calling - Real estate apps - IoT- BLE/ibeacons, Healthcare - On demand service booking apps - Sports apps - AI & Machine Learning – Predictive analytics, recommendation systems, personalization, chatbots, fraud detection, intelligent automation These verticals can be verified from my profile too. I'm well versed in using wallet based SDKs including Mastercard, Pay- Pal, Braintree, Simply Commerce, Quickpay, Razorpay SDK etc for e-wallet based applications. I have worked extensively with stock trading apps with vast knowledge in exante.eu, Meta trader 5, socket based programming for real time stock price alerts. I can integrate a number of crypto-currency wallets for your app including Bit-coin Core, Electrum, Jaxx cryptocurrencies, Rippex and Exodus that offer an easy-to-use interface, better protection against fraud, Lightweight and easy to set up and easy recovery for BTC using a wallet seed. I thrive on challenges and exhibit hyperactivity when problem-solving. My ability to think deeply and beyond the obvious sets me apart. Let's collaborate and discuss your ideas. I can help you achieve the best solutions for your business needs. I am currently on the lookout for new avenues.

Are you ready to start working with me? I’m not just a programmer. I take the time to understand your business domain, how your processes actually work, and what your users need. This allows me to create a strong connection between your business requirements, our collaboration, and the software we build. For 17+ years, I’ve been building software professionally, including 13+ years working on real products across multiple companies and industries — from ERP and education to monitoring, healthcare, SaaS, and enterprise systems. I’ve worked on products throughout their lifecycle — understanding business requirements, designing architecture, writing code, integrating systems, optimizing performance, fixing legacy problems, and continuously improving software used by real businesses and users. At the same time, I’ve built a strong freelance career, delivering 66+ successful software projects worldwide and maintaining a 100% Job Success Score on Upwork. My clients have consistently been satisfied with the results, and many projects have grown into long-term cooperation. This combination gives me two perspectives that are valuable to my clients: As a product engineer, I understand what it means to work on a product every day, deal with real users, business processes, technical debt, architecture, and long-term product evolution. As a freelancer, I understand that your time and money matter. I take responsibility for understanding the problem, communicating clearly, and delivering a solution that actually works for your business. How I Work With Clients ⭐ I don’t simply wait for specifications — I dive into the business domain and ask questions when something doesn’t make sense. ⭐ I provide a transparent real-time development process with active Kanban tasks, planning, progress tracking, and continuous communication. ⭐ You can always understand what I’m working on now, what is planned next, and how the product is progressing. ⭐ I use AI-powered development tools for research, coding, debugging, refactoring, documentation, and problem-solving to make development faster and more efficient. Why Clients Hire Me ⭐ 17+ years of professional software development experience ⭐ 13+ years working on real products across multiple companies and industries ⭐ 66+ successful freelance projects delivered worldwide ⭐ Top Rated Upwork Developer with a 100% Job Success Score ⭐ Senior C# / .NET Full Stack Developer experienced in SaaS, enterprise software, ERP systems, complex business logic, and legacy modernization ⭐ Experience building and maintaining software used by 250,000+ users ⭐ Led development for enterprise SaaS platforms with 20+ engineers ⭐ Reduced page load time from 30 seconds to 1 seconds ⭐ Reduced deployment time from several minutes to under one second ⭐ Optimized high-load systems and reduced infrastructure costs by 66% ⭐ Strong expertise in software architecture, backend, frontend, databases, cloud integrations, and system optimization My goal is not simply to write code that matches a specification. My goal is to understand your business, your product, and the problem we are solving — and then work with you to build the right solution. Full Stack .NET Development Services SaaS Development • Full Stack SaaS Development • Senior .NET Developer for startup MVPs and enterprise platforms • Multi-tenant SaaS architecture • REST APIs • Authentication & Authorization • Subscription systems • Admin dashboards • Cloud-ready applications Full Stack Development • Full Stack .NET Development • C# Development • ASP.NET Core • Blazor Server • Blazor WebAssembly • Razor Pages • SQL Server • Entity Framework Core • JavaScript • HTML • CSS • API integrations Software Engineering • Software Architecture • System Design • Domain-driven application design • Performance optimization • Refactoring • Code reviews • Technical leadership • Scalable software solutions Legacy Modernization • ASP.NET WebForms → ASP.NET Core • WinForms → Blazor • .NET Framework → .NET • ASP.NET MVC → Razor Pages • Database modernization • Performance optimization • Cloud migration Desktop Application Development • WinForms • Windows Services • Enterprise desktop software • Background services • Hybrid desktop/web solutions Workflow Discovery • Analyze business requirements • Review existing systems • Define scalable architecture Architecture • Design maintainable software • Define service boundaries • Choose appropriate technologies • Plan long-term scalability Development • Senior C# Development • Full Stack Engineering • Backend development • Frontend development • API integrations • Database design • Third-party integrations Optimization • Performance tuning • SQL optimization • Memory optimization • Infrastructure optimization • Cost reduction Technologies C# .NET ASP.NET Core Blazor Blazor Server Blazor WebAssembly Razor Pages Entity Framework Core SQL Server JavaScript TypeScript HTML5 CSS3 REST API Microservices Azure WinForms

✔ IoT Solution Leader | Leading a team of 220+ engineers ✔ 11+ Years in connected products | End-to-end IoT development ✔ Hardware + Firmware + Cloud Expertise Drop me a message with “DISCOVERY” - we’ll run a free discovery session and turn your idea into a clear architecture, timeline, and execution roadmap while avoiding costly mistakes early on. I lead a 220+ engineer team specializing in end-to-end IoT development – from early discovery and architecture to prototyping, production preparation, and long-term product evolution. Over the last 11+ years, I’ve been involved in building connected solutions that combine embedded systems, electronics, firmware, cloud platforms, and user apps (web, mobile, desktop). My role is focused on bridging business goals with engineering reality: helping teams validate ideas, select the right architecture, reduce technical risks, and build products that can successfully move from prototype to production. Core expertise: • IoT system architecture Designing complete connected ecosystems: devices, communication layers, cloud infrastructure, data flows, APIs, and user applications. • Embedded systems & firmware MCU/MPU-based development, RTOS, embedded Linux, device drivers, hardware communication protocols, low-power optimization, OTA updates. • Hardware development & prototyping Electronics design, schematics, PCB development, hardware bring-up, testing, validation, and preparation for mass production. • Connectivity & communication BLE, Wi-Fi, LoRaWAN, LTE/cellular, MQTT, sensor integration, and reliable device-to-cloud communication. • IoT cloud platforms AWS IoT, device management, telemetry pipelines, real-time monitoring, analytics, and scalable backend architectures. • Connected applications Web dashboards, mobile apps, desktop applications, admin portals, device management platforms, and third-party integrations. Typical IoT products I work with: • Industrial IoT & Industry 4.0 Connected machinery, predictive maintenance, industrial automation, sensor networks, and remote monitoring. • Smart Home & Building Automation Connected devices, automation platforms, energy management, and intelligent control systems. • Healthcare & Wearables Connected medical devices, monitoring solutions, wearable ecosystems, and compliance-focused development. • Energy & Infrastructure Smart metering, energy monitoring, telemetry systems, and remote control solutions. • Location-based products GPS tracking, asset tracking, fleet monitoring, and safety-focused connected devices. • Robotics & Drones UAV/UGV/UAS platforms, telemetry, control systems, and autonomous solutions. Selected project experience: • GPS tracking ecosystem Built a connected solution combining hardware devices, firmware, cloud infrastructure, mobile applications, and management dashboards for real-time tracking and alerts. • Wearable safety platform Developed an IoT wearable ecosystem with embedded software, wireless connectivity, cloud services, and user-facing applications. • Industrial monitoring solution Created a sensor-based platform for collecting operational data, processing telemetry, and providing actionable insights through dashboards. Why clients work with me: • Strong industrial and commercial product development experience I work with complex products where reliability, scalability, security, and real-world constraints matter. • Ability to handle both hardware and software challenges IoT success depends on how all system components work together - not isolated development tasks. • Clear communication and structured development process Transparent milestones, technical documentation, predictable execution, and clear ownership at every stage. • Focus on practical solutions I help teams avoid unnecessary complexity and choose architectures that fit actual product goals. • Long-term support mindset Project scope for reference: Phase 01 – Definition & Architecture: $15k–$25k Discovery, requirements analysis, system architecture, technology selection, and roadmap creation. Phase 02 – Prototype & Validation: $35k–$120k Hardware prototypes, firmware, cloud infrastructure, applications, testing, and product validation. Phase 03 – Production Readiness: $60k–$250k+ Production optimization, manufacturing support, certification preparation, scalability improvements, and deployment. My approach: I don’t start with coding. I start by understanding the product vision, business goals, technical constraints, and future scaling requirements. The goal is to create IoT systems that work reliably in real-world conditions, avoid expensive redesigns, and provide a strong foundation for future growth. If you’re building a connected product involving hardware, firmware, cloud, or device management - feel free to share your idea. I'm ready to help evaluate the technical approach and identify the most practical path forward. Worth a chat?

Need a fintech developer to build or scale your lending, payments, banking or SaaS platform? I've architected systems that helped one client secure 100M euros in funding, and delivered 28 projects with a 4.98 rating on Upwork. I combine 12+ years of full-stack engineering with deep fintech domain knowledge, spanning digital wallets, lending marketplaces, KYC/AML compliance, and Open Banking integrations. On top of that, I build AI agents and automation systems, so I can add intelligent workflows, document processing, and conversational AI on top of the financial platforms I build. Few developers cover both the regulatory complexity of fintech and modern AI tooling. One client wrote: ⭐⭐⭐ "Zubair built a P2P fintech platform for us that helped us secure €100M in funding. His technical expertise, architecture decisions, and product thinking were instrumental to our success." 𝐖𝐡𝐚𝐭 𝐈 𝐁𝐮𝐢𝐥𝐝: ✔ FinTech & Digital Banking Solutions ✔ Digital Wallets & Payment Platforms ✔ Loan & Lending Platforms ✔ Investment & Wealth Management Systems ✔ Personal Finance Applications ✔ Insurance & InsurTech Platforms ✔ Marketplace & Booking Platforms ✔ AI Agents & Workflow Automation ✔ Enterprise SaaS Platforms ✔ Enterprise CRM & ERP Systems 𝐈𝐧𝐝𝐮𝐬𝐭𝐫𝐢𝐞𝐬 𝐈'𝐯𝐞 𝐖𝐨𝐫𝐤𝐞𝐝 𝐈𝐧 💳 𝐅𝐢𝐧𝐓𝐞𝐜𝐡 𝐚𝐧𝐝 𝐁𝐚𝐧𝐤𝐢𝐧𝐠 Digital wallets, mobile banking, payments, QR payments, lending, KYC/KYB, AML, Open Banking, wealth management, brokerage integrations, Stripe, Plaid, compliance systems, and financial analytics. 🚀 𝐒𝐚𝐚𝐒 & 𝐄𝐧𝐭𝐞𝐫𝐩𝐫𝐢𝐬𝐞 AI Agents, Voice AI, RAG applications, workflow automation, document intelligence, recommendation engines, conversational AI, and enterprise AI platforms. 🤖 𝐀𝐈 𝐚𝐧𝐝 𝐀𝐮𝐭𝐨𝐦𝐚𝐭𝐢𝐨𝐧 AI Agents, Voice AI, RAG applications, workflow automation, document intelligence, recommendation engines, conversational AI, and enterprise AI platforms. 𝐓𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 I specialize in production-grade software using: React, Next.js, Angular Node.js, NestJS, Python, .NET React Native & Flutter PostgreSQL, SQL Server, MongoDB AWS, Azure, Docker, Kubernetes OpenAI, Claude, LangChain, RAG Stripe, Plaid, Open Banking APIs Twilio, Firebase, GraphQL & REST APIs 𝐇𝐨𝐰 𝐈 𝐖𝐨𝐫𝐤 I don't just write code. I partner with clients to make the right technical and product decisions. Every project starts with understanding your business goals before designing an architecture that is scalable, secure, and built to last. If you're ready to build or scale a fintech, SaaS, or AI-powered platform, send me a message with a short description of your project and I'll reply within a day with next steps. Keywords: Fintech Developer, Payment Gateway Development, Digital Wallet Development, Lending Platform, Loan Management System, Banking Software Development, Open Banking API, Stripe Integration, Plaid Integration, KYC KYB Compliance, AML Software, RegTech, InsurTech, Wealth Management Software, Investment Platform Development, P2P Payments, Cross-Border Payments, Remittance Platform, Neobank Development, Mobile Banking App, SaaS Development, Enterprise Software Development, CRM Development, ERP Development, Marketplace Development, Booking Platform Development, AI Agent Development, RAG Applications, LangChain Developer, Conversational AI, Voice AI Development, Workflow Automation, Document Intelligence, n8n Automation, Zapier Automation, Full Stack Developer, React Developer, Next.js Developer, Node.js Developer, Python Developer, .NET Developer, React Native Developer, Flutter Developer, PostgreSQL, MongoDB, AWS Developer, Azure Developer, Docker, Kubernetes, GraphQL API, REST API Development, OpenAI Integration, Claude API Integration, Software Architecture, Scalable System Design

Hi there! I help ecommerce brands, agencies, and growing businesses build reliable Shopify Plus stores, AI automation systems, custom apps, and full-stack digital products that are clean, scalable, and built for real business use. With 10+ years of experience in Shopify development, full-stack engineering, AI automation, and custom integrations, I focus on building solutions that do more than look good. They improve operations, increase conversions, automate repetitive work, and connect smoothly with your existing tools. 💡 Shopify Plus & E-commerce Development ✅ Shopify & Shopify Plus store design, redesign, development, theme customization, and OS 2.0 upgrades ✅ Figma, PSD, XD to Shopify using Liquid, HTML, CSS, JavaScript, and modern frontend practices ✅ Custom Shopify sections, templates, metafields, product pages, collection pages, and landing pages ✅ CRO-focused improvements, checkout optimization, upsells, cross-sells, AOV growth, and post-purchase flows ✅ Shopify Markets, multilingual stores, multi-currency, internationalization, and multi-region setup ✅ Shopify Functions, Checkout UI Extensions, Bundles, subscriptions, memberships, loyalty, and B2B/DTC workflows ✅ Private apps, custom APIs, ERP, CRM, POS, 3PL, ShipStation, Klaviyo, HubSpot, and third-party integrations ✅ Store speed optimization, Core Web Vitals, UX audits, SEO cleanup, GA4, Meta Pixel, and conversion tracking ✅ Headless Shopify Plus, WooCommerce, Magento, and custom ecommerce platform development ✅ AI-powered shopping experiences with chatbots, smart search, product discovery, recommendations & personalization 💡 AI Automation & Generative AI Solutions I build production-ready AI systems that don’t just demo well, they run reliably inside your business. ✅ Custom AI agents, virtual employees, workflow automation, and intelligent business process automation ✅ AI chatbots, customer support automation, ecommerce assistants, smart search, and product recommendation systems ✅ RAG systems, enterprise knowledge bases, semantic search, and intelligent document retrieval ✅ AI applications using OpenAI, Claude, Gemini, Mistral, Groq, DeepSeek, Hugging Face, and open-source LLMs ✅ LangChain, LangGraph, LlamaIndex, CrewAI, multi-agent workflows, and custom AI orchestration ✅ OCR, invoice processing, document intelligence, structured data extraction, summarization, and classification ✅ Vector databases including Pinecone, ChromaDB, PGVector, Weaviate, and Qdrant ✅ AI integrations with Shopify, HubSpot, CRMs, ERPs, internal tools, databases, and third-party APIs ✅ Automation using n8n, Make, Zapier, APIs, Selenium, Puppeteer, Playwright, and custom Python scripts ✅ Monitoring, evaluation, prompt optimization, PII handling, cost control, and secure AI deployment 💡 Custom Web App, Mobile Apps & Full-Stack Development For clients who need more than a store or automation script, I also build full custom platforms and business systems. ✅ Custom web applications, SaaS platforms, dashboards, marketplaces, admin panels, and internal tools ✅ Frontend development using React, Next.js, Vue.js, Angular, Svelte, TypeScript, HTML, CSS, and JavaScript ✅ Backend development using Python, Django, FastAPI, Node.js, Express, NestJS, PHP, Laravel, and CodeIgniter ✅ Cross-platform mobile apps using React Native, Expo, and TypeScript ✅ API development, REST, GraphQL, payment gateways, Stripe, PayPal, Razorpay, and custom third-party integrations ✅ Databases and infrastructure using PostgreSQL, MySQL, MongoDB, Firebase, Supabase, Redis, and Appwrite ✅ Real-time features including live tracking, messaging, notifications, maps, WebSockets, WebRTC, and media processing ✅ Cloud deployment, CI/CD, Docker, Kubernetes, AWS, Google Cloud, Azure, DigitalOcean, Vercel, and Netlify 💡 How I Work ✅ I build with a production mindset, not just a “get it done” mindset ✅ Clean code, scalable structure, proper testing, and long-term maintainability ✅ Clear communication, reliable delivery, and proactive problem-solving ✅ Strong focus on business outcomes, not just technical implementation ✅ Comfortable working directly with founders, ecommerce teams, SaaS companies, and agencies ✅ Available for white-label development, long-term retainers, project-based work, and ongoing technical support Whether you need a high-converting Shopify Plus store, a custom ecommerce feature, an AI agent for your operations, a workflow automation system, or a complete web/mobile application, I can help you design, build, integrate, and scale it properly. Send me your store, workflow, or product brief, and I’ll help you identify the cleanest technical path to build, automate, or scale it. Let’s discuss your project 🤝

𝗪𝗵𝘆 𝗯𝘂𝗶𝗹𝗱 𝘀𝗹𝗼𝘄𝗲𝗿 𝘄𝗵𝗲𝗻 𝗔𝗜 𝗮𝗻𝗱 𝗲𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 𝗰𝗮𝗻 𝗯𝘂𝗶𝗹𝗱 𝗯𝗲𝘁𝘁𝗲𝗿? I help 𝙨𝙩𝙖𝙧𝙩𝙪𝙥𝙨, 𝙎𝙖𝙖𝙎 𝙘𝙤𝙢𝙥𝙖𝙣𝙞𝙚𝙨, and 𝙗𝙪𝙨𝙞𝙣𝙚𝙨𝙨𝙚𝙨 turn ideas into reliable, scalable software, from MVPs and internal platforms to production-ready SaaS applications and AI-powered features. With 5+ years of experience, 18+ completed Upwork jobs, and a 100% Job Success Rate, I combine senior full-stack engineering with modern AI capabilities to build software that solves real business problems. My focus is not just writing code. I help clients make the right technical decisions, build maintainable systems, integrate the right technologies, and deliver software that performs reliably in production. 𝙃𝙤𝙬 𝙄 𝙃𝙚𝙡𝙥 𝘽𝙪𝙨𝙞𝙣𝙚𝙨𝙨𝙚𝙨 𝘽𝙪𝙞𝙡𝙙 𝘽𝙚𝙩𝙩𝙚𝙧 𝙎𝙤𝙛𝙩𝙬𝙖𝙧𝙚 ➤ 𝙁𝙪𝙡𝙡-𝙎𝙩𝙖𝙘𝙠 𝙎𝙖𝙖𝙎 𝘿𝙚𝙫𝙚𝙡𝙤𝙥𝙢𝙚𝙣𝙩 Build complete web applications from the ground up, including frontend, backend APIs, databases, authentication, payments, dashboards, and third-party integrations. I work extensively with Next.js, React, Django, FastAPI, Python, PostgreSQL, and Supabase. ➤ 𝘼𝙄-𝙋𝙤𝙬𝙚𝙧𝙚𝙙 𝘼𝙥𝙥𝙡𝙞𝙘𝙖𝙩𝙞𝙤𝙣𝙨 & 𝘼𝙪𝙩𝙤𝙢𝙖𝙩𝙞𝙤𝙣 Integrate AI into real business workflows to reduce manual work, improve productivity, and create smarter product experiences. I work with modern AI platforms and APIs including 𝙊𝙥𝙚𝙣𝘼𝙄, 𝘾𝙡𝙖𝙪𝙙𝙚, 𝙂𝙚𝙢𝙞𝙣𝙞, and other 𝙇𝙇𝙈-based services. ➤ 𝘽𝙖𝙘𝙠𝙚𝙣𝙙 & 𝘼𝙋𝙄 𝙀𝙣𝙜𝙞𝙣𝙚𝙚𝙧𝙞𝙣𝙜 Design reliable backend systems and APIs that support real-world business operations. My experience includes: * Django & FastAPI * REST APIs * GraphQL * WebSockets * PostgreSQL * Redis * Microservices * Third-party API integrations * Authentication & authorization * Payment integrations ➤ 𝙈𝙤𝙙𝙚𝙧𝙣 𝙁𝙧𝙤𝙣𝙩𝙚𝙣𝙙 𝘿𝙚𝙫𝙚𝙡𝙤𝙥𝙢𝙚𝙣𝙩 Build fast, responsive, and maintainable interfaces for SaaS platforms, dashboards, marketplaces, and business applications. My frontend experience includes: * Next.js * React * TypeScript * Angular * Vue.js * Tailwind CSS ➤ 𝙋𝙚𝙧𝙛𝙤𝙧𝙢𝙖𝙣𝙘𝙚, 𝘼𝙧𝙘𝙝𝙞𝙩𝙚𝙘𝙩𝙪𝙧𝙚 & 𝙎𝙘𝙖𝙡𝙖𝙗𝙞𝙡𝙞𝙩𝙮 When an existing application becomes slow, difficult to maintain, or expensive to extend, I help identify the underlying problems and improve the architecture. This includes: * Database and query optimization * API performance * Frontend performance * Codebase refactoring * Architecture improvements * Caching and Redis * Production reliability * Scalable application design ➤ 𝙋𝙧𝙤𝙙𝙪𝙘𝙩𝙞𝙤𝙣 𝘿𝙚𝙥𝙡𝙤𝙮𝙢𝙚𝙣𝙩 & 𝘿𝙚𝙫𝙊𝙥𝙨 I take applications beyond development and help get them running reliably in production. Experience includes: * Docker * CI/CD * Vercel * Railway * AWS/GCP environments * PostgreSQL infrastructure * Production deployments * Environment and configuration management 𝙄’𝙢 𝙖 𝙂𝙧𝙚𝙖𝙩 𝙁𝙞𝙩 𝙄𝙛 𝙔𝙤𝙪 𝘼𝙧𝙚 * A startup founder launching an MVP * A SaaS company improving performance or adding features * An enterprise team modernizing or extending an existing system * A non-technical client who needs clear technical guidance and ownership 𝙏𝙮𝙥𝙞𝙘𝙖𝙡 𝙋𝙧𝙤𝙟𝙚𝙘𝙩𝙨 𝙄 𝙒𝙤𝙧𝙠 𝙊𝙣 * SaaS platforms * Business management systems * AI-powered applications * Dashboards and internal tools * Marketplace platforms * Booking and service platforms * Fleet and transportation systems * Healthcare applications * ERP and business systems * API-driven applications * Legacy application modernization * Third-party integrations and automation If you need a senior engineer who can understand the business problem, make sound technical decisions, and take your product from 𝙞𝙙𝙚𝙖 → 𝙖𝙧𝙘𝙝𝙞𝙩𝙚𝙘𝙩𝙪𝙧𝙚 → 𝙙𝙚𝙫𝙚𝙡𝙤𝙥𝙢𝙚𝙣𝙩 → 𝙥𝙧𝙤𝙙𝙪𝙘𝙩𝙞𝙤𝙣, I’d be happy to discuss your project. Python, Django, FastAPI, Next.js, React, TypeScript, PostgreSQL, Supabase, Redis, Docker, REST APIs, GraphQL, WebSockets, AI/LLM integrations, OpenAI API, Claude, Gemini, Vercel, Railway, AWS, GCP.

Senior Full-Stack Developer specializing in Next.js, React, TypeScript, Node.js, Supabase, PostgreSQL, and AI-powered SaaS applications. I'm Top Rated Plus with 100% Job Success, $100K+ earned, and 65+ completed Upwork projects. I also work with the University of Hawaiʻi on research portals, dashboards, and data-driven applications. I help clients build and improve: • SaaS platforms and MVPs • AI-powered applications and LLM integrations • Admin dashboards and internal tools • Multi-tenant applications • Marketplaces and customer portals • API integrations and workflow automation • Authentication, RBAC, and payment systems My work includes UpTecHunt, a two-sided marketplace with messaging, contracts, payments, and multi-user workflows, and MetroAnalytics, a SaaS analytics platform with dashboards, APIs, authentication, subscriptions, and data-driven features. I’m comfortable joining an existing codebase or building from the ground up. I focus on clean architecture, reliable production code, clear communication, and taking ownership from requirement through deployment. If you need a senior developer who can understand the product as well as the code, let's talk.

15+ YEARS WITH SALESFORCE EXP. 🏆 TOP 1% EXPERT-VETTED SALESFORCE ARCHITECT | 99% JOB SUCCESS | 36X SALESFORCE CERTIFIED | 14X HUBSPOT CERTIFIED | [trailblazer.me/id/joaquinArc] | ALWAYS VERIFY SALESFORCE CREDENTIALS BEFORE HIRING FOR YOUR PROJECT Clients typically bring me in when their Salesforce org needs a reset: broken Flows and Apex automation, reports and dashboards that no longer match how the business actually runs, and undocumented customizations left by previous consultants. I untangle it, fix what's broken, and hand back a system your team can maintain. By the time they reach me, the org is hard to change, automation fires in ways nobody can explain, reports stopped matching the business a while ago, and two or three consultants have been through, each leaving a layer behind. There is usually one person left who half understands it, and everyone is afraid of the day they leave. If that sounds familiar, the situation is more normal than it feels from inside, and it is fixable. I have spent most of my career inside orgs exactly like this, and none of them was beyond repair. That is the work I do. I take over existing Salesforce environments, figure out how they are actually built, find what is slowing your team down, and turn the org into something your business can rely on and change without holding its breath. Nothing gets ripped out on day one. I work carefully, in small reversible steps, and your team keeps working while I do. You will always know where things stand. I explain what I find in plain English, tell you what each decision costs before you make it, and document everything I build, so what you learn about your own org stays with you and not with me. 👤 Who you are hiring Me. Not an account manager, not a junior developer working under my name. I run every engagement personally, from discovery and architecture through implementation, integrations, deployment, and support. $2M+ earned on Upwork across 100+ projects, and every one of them finished. Whether you're a startup scaling fast or an enterprise untangling a complex org, you'll get senior-level work delivered on time. ⚡ How I work Everything you say reaches me, because there is nobody between us. You explain your problem once, to the person who will actually solve it. I think before I build. The cheapest time to fix an architecture mistake is before it exists, so every solution gets designed for how your business will look in three years, not just how it looks this quarter. Fast, without the usual trade-off. I deliver quickly because I have solved most of these problems before, not because I skip steps. You get documentation with everything. If someone else has to maintain it someday, they can. Your org should never depend on my memory. And most clients stay. Not because anything obliges them to, but because once someone knows your org well, every future question gets cheaper to answer. 🎓 Salesforce Sales Cloud · Service Cloud · Experience Cloud · Revenue Cloud (CPQ) · Financial Services Cloud · Marketing Cloud · Account Engagement (Pardot) · Agentforce AI · Lightning Web Components · Apex · Flow Builder · Reports & Dashboards · CRM Analytics · Integrations · MuleSoft · Data Migration · AppExchange Development · Managed Packages 🔧 Beyond Salesforce HubSpot (CRM, Sales Hub, Marketing Hub) · Lead Lifecycle Automation · REST & SOAP APIs · Zapier · Slack · Power BI · Tableau · OpenAI & AI Automation · CRM Migrations · Workflow Automation 🎓 Certifications 7 Salesforce certifications, including Administrator, Advanced Administrator, Platform App Builder, Platform Developer I & II, Sales Cloud Consultant, Service Cloud Consultant, Experience Cloud Consultant, CPQ Specialist, Marketing Cloud Consultant, Marketing Cloud Developer, Marketing Cloud Administrator, CRM Analytics Consultant, and MuleSoft Developer I & II. 📊 Recent work Enterprise multi-cloud implementations · Revenue Cloud (CPQ) for enterprise sales teams · Experience Cloud customer portals · Marketing Cloud automation and lead nurturing · Salesforce and HubSpot migrations · Salesforce and HubSpot migrations · Large-scale API integrations and data migrations · Agentforce AI and process automation First Salesforce implementation, an org that needs rescuing, systems that should talk to each other and do not, or a bigger CRM transformation you are still planning. Wherever you are in that list, the starting point is the same. Tell me what is not working. I will help you fix it.

I'm a Senior Full Stack & Backend Developer with extensive experience building scalable web applications, APIs, and enterprise-grade backend systems. I specialize in designing robust architectures, developing high-performance server-side solutions, and creating seamless user experiences across modern web platforms. My expertise includes Node.js, PHP, Python, JavaScript/TypeScript, React, Next.js, REST APIs, GraphQL, databases (MySQL, PostgreSQL, MongoDB), cloud services, and system integrations. I focus on writing clean, maintainable code and delivering secure, efficient, and scalable solutions tailored to business requirements. Whether you need a custom web application, backend development, API integration, database optimization, performance improvements, or full-stack product development, I can help turn your ideas into reliable, production-ready solutions. I'm committed to delivering high-quality results, clear communication, and long-term value for every project.

I build AI agents, agentic automation, RAG systems, and full-stack AI products using Python, FastAPI, React, and modern LLMs. I help teams automate real business workflows, connect AI to existing tools and data, and ship reliable systems that run in production. My work usually sits between AI engineering, backend architecture, integrations, and product development. That means I can handle the agent or LLM workflow itself, then build the APIs, queues, data layer, integrations, and frontend needed to turn it into a usable product. 𝗔𝗜 𝗔𝗴𝗲𝗻𝘁𝘀 & 𝗔𝗴𝗲𝗻𝘁𝗶𝗰 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻 • Build single-agent and multi-agent workflows with LangGraph, LangChain, tool calling, routing, memory, state, and controlled execution. • Design planning and execution flows with approvals, human-in-the-loop steps, guardrails, structured outputs, and escalation when automation should stop. • Connect agents to business tools through MCP, APIs, webhooks, databases, internal services, and custom tools. • Create agentic workflows for research, support, operations, document handling, internal knowledge, reporting, and repetitive decision-based processes. 𝗔𝗜 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻 & 𝗕𝘂𝘀𝗶𝗻𝗲𝘀𝘀 𝗪𝗼𝗿𝗸𝗳𝗹𝗼𝘄 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻 • Automate lead qualification, CRM updates, customer support, document processing, data extraction, reporting, content operations, and back-office workflows. • Connect LLMs with n8n, Make, Zapier, Slack, email, CRMs, REST APIs, webhooks, PostgreSQL, Supabase, and other internal or third-party systems. • Build event-driven automation with scheduling, retries, queues, idempotency, audit trails, failure recovery, and monitoring. • Replace fragile prompt chains with controlled workflows that can validate outputs, retry safely, route between models or tools, and request human review when needed. 𝗥𝗔𝗚, 𝗟𝗟𝗠 𝗔𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀 & 𝗞𝗻𝗼𝘄𝗹𝗲𝗱𝗴𝗲 𝗦𝘆𝘀𝘁𝗲𝗺𝘀 • Build RAG pipelines, document intelligence, semantic search, knowledge assistants, and source-grounded internal tools. • Work with OpenAI, Claude, Gemini, vector databases, embeddings, chunking, retrieval, reranking, structured outputs, and evaluation. • Improve accuracy and reliability with evidence linking, confidence handling, fallback paths, prompt and retrieval testing, and observable traces. 𝗙𝘂𝗹𝗹-𝗦𝘁𝗮𝗰𝗸 𝗔𝗜 𝗣𝗿𝗼𝗱𝘂𝗰𝘁 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴 • Backend development with Python, FastAPI, Django, Node.js, TypeScript, REST APIs, GraphQL, Redis, Celery, and background jobs. • Frontend development with React, Next.js, TypeScript, Tailwind CSS, dashboards, workflow UIs, admin tools, and real-time product experiences. • Production deployment with Docker, AWS, Azure, GCP, PostgreSQL, Supabase, MongoDB, CI/CD, logging, monitoring, and cloud integrations. 𝗩𝗼𝗶𝗰𝗲 𝗔𝗜 & 𝗥𝗲𝗮𝗹-𝗧𝗶𝗺𝗲 𝗦𝘆𝘀𝘁𝗲𝗺𝘀 • Build voice and conversational workflows using WebRTC, Twilio, VAPI, speech-to-text, text-to-speech, tool calling, and CRM/API actions. • Handle the production details around latency, session state, interruptions, fallback behavior, call events, logging, and workflow handoff. If you are building an AI product or trying to automate a workflow that still needs too much manual work, send me the current process, stack, and bottleneck. I can help map the practical path from prototype to a production-ready system. AI Agent Developer | AI Automation Developer | Agentic AI Developer | Generative AI Developer | LLM Developer | RAG Developer | Python AI Developer | FastAPI Developer | Full Stack AI Developer | AI Integration Developer | Workflow Automation Developer | LangGraph Developer | OpenAI API Developer | n8n AI Automation | Voice AI Developer