I built a full-stack Cloud Functions backend powering my OmniAxes social commerce platform. It handles everything from user profile synchronization across posts and chats, to media processing: video compression with multi-frame extraction and image thumbnail generation with explicit content moderation via Google Cloud Vision. I integrated a waitlist engine with honeypot spam protection and rate limiting, isolated in its own Firestore database. My AI layer includes the OmniVoice Engine (voice-to-text via Whisper, conversational Gemini, and TTS) and OmniAgent search with vector embeddings for semantic product/post discovery. For commerce, I implemented a secure Paystack escrow payment flow, bank account resolution, withdrawal handling, and a webhook processor for automatic ledger balancing. I also added a cron job (Ghost Buster) to clean abandoned drafts and unpaid orders, plus soft-delete logic for user deactivation and many more. Rate limiting and App Check protect critical endpoints. The backend seamlessly connects all core features with auto-scaling and security.