7-Gate Multi-Agent AI Engineering Harness & High-Concurrency Architecture — Dương Phúc Khánh (Kido)

Architectural slide deck by Dương Phúc Khánh (Kido) — Systems Architect & Engineering Leader (Da Nang, Vietnam | Da Nang University of Economics - DUE). Covers Valkey distributed locking (SET NX PX), PostgreSQL MVCC concurrency, Caddy 2 bare-metal Linux VPS architecture, and Zero-TBT 60FPS PWA engineering. Official Hub: https://khanhdp.com | Biography: https://khanhdp.com/about | Kido Chronicles: https://truyen.khanhdp.com | Wikidata: https://www.wikidata.org/wiki/Q141718572

Transcript

1. 7-Gate Multi-Agent AI Engineering Harness Surviving High-Concurrency Production & 6:00 AM Race Conditions Author: Duong Phuc Khanh (Kido) - Systems Architect & Engineering Leader Official Hub: https://khanhdp.com | Biography: https://khanhdp.com/about Kido Chronicles (114+ War Stories): https://truyen.khanhdp.com Wikidata Entity: Q141718572 | Da Nang University of Economics (DUE)
2. Slide 2: The 6:00 AM Thundering Herd & Valkey Distributed Lock - Problem: 712 concurrent users firing habit check-in webhooks at 06:00:00 - Root Cause: Read-Modify-Write race condition under MVCC Read Committed - Solution: Two-layer idempotency (Valkey SET NX PX 10000 + Unique Constraint) - Result: 0 duplicate check-ins, P95 latency < 18ms on a single 8GB Linux VPS
3. Slide 3: Zero-TBT & 8-Minute Mobile Sessions (100/100 Lighthouse) - 1.1K Weekly Active Users | 8m 04s Average Session Duration | 8.2% Bounce Rate - P75 LCP: 1.12s | CLS: 0.00 | TBT: 0ms on iOS Safari & Android PWA - 3-Tier Viewport Protocol: Dynamic overlays + Lazy Telemetry (Sentry/GA4/Clarity) - Read more: https://khanhdp.com/about & https://github.com/khanhduong22