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Duong Phuc Khanh (Dương Phúc Khánh) - Systems Architect: Dissecting Next.js 16 True HTTP 404, Zero-CLS L1 Quote Cache & Quantitative Portfolio NAV
I'm Duong Phuc Khanh (Dương Phúc Khánh) - Systems Architect (known across the engineering community …
How I export ChatGPT, Claude and Gemini chats locally
i keep good stuff in ai chats (code, prompts, notes) and kept losing it. here's what actually works …
Rethinking Shopify Post-Purchase Tracking: A Technical Deep Dive
When I first started consulting for Shopify store owners to optimize their checkout flows, I noticed…
How I Built a Custom Shopify Tracking Widget to Reduce WISMO
When I first launched my Shopify store, I thought the hardest part would be getting the first sale. …
Why Secondary Marketplaces Are Broken (And How We Built a 1-Second Deal Engine to Fix It)
If you have ever tried to buy an iPhone, a GPU, or a ThinkPad on a secondary classifieds marketplace…
What Sakupa's 30-day free preview actually covers, and what the ¥200 plan means
First, a disclaimer: I am not Sakupa's developer. I found this MCP server while looking into ways to…
How I Built an Edge-Powered SaaS Starter for SEO Tools
When I first started building SaaS products, I fell into a predictable trap. I would spend the first…
My payment endpoint returned 503 for nine hours and three separate bugs were hiding it
At 20:31 UTC my public payment endpoint stopped serving. The health check kept reporting OK for anot…
email_exists on createUser Hides a Silent Signup Failure
Conclusion When Supabase Auth's auth.admin.createUser fails with a duplicate email (email_exists),…
How I Fixed Global SaaS Latency with Edge Workers
When I first launched my side project, I thought standard serverless functions were enough. I deploy…
We shopped 75 Indian Shopify stores before Diwali. Here's what their checkout looks like
Before Diwali I ran an automated shopper (CartBeam) through 75 independent Indian Shopify stores: op…
The Workflow That Retried a Dead Provider 200 Times: Backoff, Jitter, and Circuit Breakers in n8n
This is part of my build-in-public series on running LLM workflows in n8n in production. Everything …