https://wonsukchoi.co/en/blog Thoughts on building products, AI, and growing without paid acquisition. en Sat, 16 May 2026 23:32:09 GMT https://wonsukchoi.co/en/blog/ai-coding-workflow-2026 https://wonsukchoi.co/en/blog/ai-coding-workflow-2026 I run more than 10 production apps as one developer. Here's how AI fits into my actual daily workflow: the tools, the patterns, what moved the needle, and what I stopped using. Wed, 13 May 2026 17:34:29 GMT https://wonsukchoi.co/en/blog/type-safe-nextjs-app-router https://wonsukchoi.co/en/blog/type-safe-nextjs-app-router App Router introduced async params, server actions, and new patterns for forms and mutations — and TypeScript support for all of it has sharp edges. Here are the patterns I use to keep things type-safe without fighting the framework. Wed, 13 May 2026 08:41:08 GMT https://wonsukchoi.co/en/blog/supabase-multi-tenancy-production https://wonsukchoi.co/en/blog/supabase-multi-tenancy-production Running multi-tenant apps on Supabase is mostly a schema and RLS problem — until it isn't. Here are the patterns I use across production apps: tenant isolation, JWT claims, request-time config, middleware, and the gotchas that cost the most time. Wed, 13 May 2026 08:38:50 GMT https://wonsukchoi.co/en/blog/knowledge-base-chat-supabase-claude https://wonsukchoi.co/en/blog/knowledge-base-chat-supabase-claude A complete walkthrough of building a RAG-based knowledge base chat: pgvector schema, embedding models, the retrieval function, chunking strategy, and the Claude prompt pattern — including the gotchas that cause silent failures. Thu, 30 Apr 2026 01:35:00 GMT https://wonsukchoi.co/en/blog/supabase-rls-production-patterns https://wonsukchoi.co/en/blog/supabase-rls-production-patterns Row Level Security is powerful but full of silent failures and performance traps. Here are the patterns I use across seven production apps — and the gotchas that cost me the most time. Wed, 29 Apr 2026 21:31:00 GMT https://wonsukchoi.co/en/blog/ai-seo-2026-whats-working https://wonsukchoi.co/en/blog/ai-seo-2026-whats-working AI SEO is real and it matters — but most advice about it is wrong. Here's what's actually moving the needle across my sites in 2026: the signals that work, the tactics that don't, and what I actually do. Wed, 29 Apr 2026 21:20:22 GMT https://wonsukchoi.co/en/blog/coolify-vs-vercel-self-hosting https://wonsukchoi.co/en/blog/coolify-vs-vercel-self-hosting I run seven production sites and use both Coolify and Vercel — for different reasons. Here's the honest breakdown: what each platform actually does better, what I run where, and how to decide which fits your setup. Wed, 29 Apr 2026 21:18:17 GMT https://wonsukchoi.co/en/blog/freelance-clients-without-ads https://wonsukchoi.co/en/blog/freelance-clients-without-ads Most advice about getting freelance clients involves spending money on ads or cold-pitching strangers. Here's what actually worked for me: the channels, the positioning, and the specific moves that bring in inbound work. Wed, 29 Apr 2026 21:14:49 GMT https://wonsukchoi.co/en/blog/nextjs-app-router-caching https://wonsukchoi.co/en/blog/nextjs-app-router-caching Next.js caching in the App Router is powerful but confusing — especially after v15 flipped the defaults. Here's what the four caches actually do, what breaks silently, and the patterns I use in every production app. Wed, 29 Apr 2026 21:11:43 GMT https://wonsukchoi.co/en/blog/multilingual-seo-i18n-guide https://wonsukchoi.co/en/blog/multilingual-seo-i18n-guide Multi-language websites unlock SEO traffic most sites never see. Here's the full picture: why it matters, how to implement it technically, and the infrastructure decision that most developers get wrong. Thu, 23 Apr 2026 19:28:54 GMT https://wonsukchoi.co/en/blog/llms-txt-ai-seo https://wonsukchoi.co/en/blog/llms-txt-ai-seo I already had an llms.txt. It was stale the moment I added the second blog post. Here's what I replaced it with — and what actually matters for AI search visibility. Thu, 23 Apr 2026 19:07:06 GMT https://wonsukchoi.co/en/blog/multi-tenant-saas-single-supabase-database https://wonsukchoi.co/en/blog/multi-tenant-saas-single-supabase-database How I run seven branded sites — one Next.js codebase, one Supabase project. A practical walkthrough of hostname resolution, feature flags, data isolation with RLS, and tenant-aware routing. Tue, 21 Apr 2026 17:26:40 GMT https://wonsukchoi.co/en/blog/personal-ops-dashboard-nextjs-supabase https://wonsukchoi.co/en/blog/personal-ops-dashboard-nextjs-supabase A look inside the private Next.js dashboard I built to manage 13 live sites — site status monitoring, personal AI, offline-capable notes, multi-tenant architecture, and more. Tue, 21 Apr 2026 17:21:53 GMT https://wonsukchoi.co/en/blog/migrate-react-to-nextjs https://wonsukchoi.co/en/blog/migrate-react-to-nextjs A practical guide to migrating from React to Next.js — what you gain, how long it takes, and the gotchas nobody warns you about. Mon, 20 Apr 2026 21:25:02 GMT