I am Shayan - full-stack web, mobile, and software developer, active since 2018. 120+ projects delivered for clients worldwide with a 5.0 rating. Whether you need a professional website, a custom web application, a mobile app for iOS or Android, an eCommerce platform, business automation through CRM or ERP systems, or an AI-powered system, I can guide the process from idea to deployment. I focus on understanding business objectives first, then designing and developing systems that are efficient, secure, and built for long term growth. Here is what I build: AI and Automation - OpenAI GPT, Claude API, LLM fine-tuning, RAG pipelines and vector databases (Supabase pgvector, Pinecone, ChromaDB), LangChain, LlamaIndex, PyTorch, TensorFlow, Hugging Face, CUDA. Chatbots, AI agents, AI search and recommendation engines, content generation tools, document and PDF processing, plus workflow automation with Python, n8n, Zapier, Make, custom web scrapers, report generation, and scheduled pipelines. Web Applications - React.js, Next.js, Vue.js, Nuxt.js, Angular, TypeScript, Node.js, Laravel, CodeIgniter, Chrome Extensions, Django, FastAPI, Express.js, Symfony, ASP.NET / .NET Core. SaaS platforms, dashboards, admin panels, booking systems, client portals, POS front-ends, and Progressive Web Apps. Websites and E-Commerce - WordPress, WooCommerce, Shopify, Magento, BigCommerce, PrestaShop, Webflow, Wix, Drupal, HubSpot CMS. HTML5/CSS3, Tailwind, Bootstrap, custom themes and plugins, redesigns, speed and on-page SEO, payment gateways (Stripe, PayPal, Square), inventory and shipping automation. Mobile Apps - Android and iOS with React Native, Flutter, Swift, Kotlin, and Ionic. Push notifications, in-app payments, offline sync, real-time features, store publishing, and POS apps with hardware features like direct receipt printing. Data Engineering - Azure Data Factory, Databricks, PySpark, SQL Server. ETL pipelines, SQL-to-PySpark migrations, workflow setup, YAML configuration, and CI/CD deployment. ERP and Business Systems - ERPNext (invoices, purchase orders, PDF-to-ERP automation), Zoho, and custom CRM dashboards shaped around your workflow. APIs and Integrations - REST, GraphQL, WebSocket, SOAP. Stripe, PayPal, Twilio, SendGrid, Xero, MYOB, Google APIs, courier APIs, email and Teams sync, and C#/.NET desktop utilities connected to your systems. Cloud and Servers - AWS (EC2, S3, Lambda, RDS, ECS), Microsoft Azure, Google Cloud, DigitalOcean. Docker, Kubernetes, Terraform, GitHub Actions, CI/CD pipelines, serverless and auto-scaling setups, Nginx, Linux administration, monitoring, and cPanel/VPS optimization. Databases - MySQL, PostgreSQL, MongoDB, SQL Server, Firebase, Redis, Cassandra, DynamoDB, Elasticsearch. Design, migration, optimization, and scaling. Industries I have worked in: Healthcare, Finance, Logistics, Retail and POS, E-Commerce, Education, Events, MVP development and SaaS startups. Shayan