✓ Custom Web Applications - Full-featured SaaS platforms, document processing systems, and business automation tools ✓ API Development & Integration - RESTful APIs, third-party integrations (OpenAI, Stripe, Twilio, SendGrid) ✓ Database Design - PostgreSQL architecture with proper schemas, security, and optimization ✓ User Authentication - Secure login systems, role-based access, and session management ✓ Payment Processing - Stripe integration with subscription tiers and usage-based billing ✓ Document Processing - PDF, Word, Excel parsing and analysis with AI-powered insights ✓ Deployment & DevOps - Docker containerization, VPS configuration, nginx, SSL certificates