We do not present conceptual Figma mockups. Below are authentic architectural breakdowns of systems conceived, engineered, and deployed into commercial production by Abhayraj Singh.
High-volume guest surges caused ordering collisions. When 40+ resort guests scanned table QR codes simultaneously, standard web requests suffered from double-booking race conditions, missing kitchen tickets, and manual bill reconciliation delays.
Engineered a 3-application ecosystem: Guest QR Ordering App, Kitchen Display System (KDS), and Reception Admin. Concurrency was hardened using PostgreSQL transaction advisory locks (pg_advisory_xact_lock) to serialize order writes without table lockouts.
Supabase database triggers listening to invoice settlements immediately invoke edge functions that generate branded dynamic PDF vouchers and dispatch them to guest WhatsApp accounts via MSG91 in under 15 seconds.
Network engineers navigating tens of thousands of pages of proprietary Cisco documentation (Catalyst, Nexus, ACI, IOS-XE/XR) were prone to configuration delays. Public LLMs hallucinated non-existent CLI flags and risked leaking internal network topologies.
Engineered a domain-isolated RAG pipeline utilizing FAISS 768-dimensional dense vector embeddings with a strict mathematical cosine similarity threshold (threshold ≥ 0.30). If no verified excerpt matched, the assistant explicitly abstained.
Fine-tuned Llama 3.2 via 4-bit QLoRA hosted on private on-premise Linux VMs. Integrated SLIM architecture with Model Context Protocol (MCP) for runtime tool discovery, querying live network telemetry securely.
Tracking 100+ offshore crew members across 30+ personal attributes and 11 maritime certifications (BOSIET, STCW, Medical Fit-to-Work). Expired certifications incur severe port authority penalties.
Architected with a strict zero-trust posture: backend containers communicate exclusively through a private Tailscale WireGuard mesh network. Zero open ports are exposed to the public internet.
Built a high-performance Python OpenPyXL spreadsheet generation engine. With a single click, port logistics officers export complex multi-sheet manifests with automated color-coded expiry alerts.
Guests scanning QR codes on mobile networks were abandoning slow, unsearchable 18MB PDF menus. The venue needed an instant, tactile mobile interface that drove higher average order values.
Engineered a lightweight, zero-bloat web application with instant dietary/category filtering, fluid animations, and direct table order routing optimized for one-handed mobile browsing.
Implemented automated WebP image compression, lazy viewport hydration, and CDN edge caching—achieving sub-800ms load times even on congested cellular connections.
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