Brandon Wie | Software Engineer

Brandon (Seokhyun) Wie

All Posts EN / KR

Software engineer writing about backend systems, DevOps, and lessons learned building real products.

Backend engineer building production systems at scale — film school grad turned engineer, now leading backend at Moba. This blog collects what I've learned along the way.

Work

Arch Calendar — The Calendar That Remembers Everything · Lead Backend

Led backend from legacy to public launch — multi-account calendar sync, payments, and real-time updates processing 10M+ events at scale.

3B System — Public 3B architecture map · /system/3b

Sanitized system map for the 3B agent harness behind this site: layers, subsystems, decisions, and blog-series progress.

Project Crucio — AISecOps Knowledge Platform · Creator

Zero Trust security for generative AI — 6 polyglot microservices (Python + Go + Rust + TypeScript), Kafka event streaming, hash-chained audit, and full LGTM observability on hybrid GCP + NAS infrastructure.

Recent Posts

Jun 5, 2026 ↻

tmux Smart Session Auto-Start — Auto-start tmux via an iTerm2 Profile Command (`tmux-smart-attach`) with numeric

Jun 5, 2026 ↻

Svelte: an async `onMount` return is NOT cleanup — Svelte runs the value returned from `onMount` as cleanup on unmount — but only when it is a function. An `async` callback returns a Promise, so the cleanup is silently ignored.

Jun 5, 2026 ↻

SvelteKit: hydrate a shared store site-wide from `+layout.ts` — A shared `writable` store populated by a single page's `onMount` is empty on every other route. Hydrate it once in the root `+layout` so every navigation carries it.

May 31, 2026 ↻

AI Code Review Confusion Patterns — Thirteen distinct ways Claude, Copilot, and Codex behave on PRs — ten failure modes plus two productive behaviors to amplify, plus an analyst-side error class. With detection signals and the empirical tiebreaker that resolves factual disagreements.

May 31, 2026 ↻

Anthropic Prompt Cache TTL + Cost Mechanics — Anthropic silently dropped Claude Code's prompt-cache TTL from 1 hour to 5 minutes around early March 2026. Without explicit awareness, idle gaps ≥5 min between messages evaporate the cache and force a full cold cache-write on the next message — pricing it at 1.25× base input on the entire conversation prefix.

One Folder, Three Agents: The `.agents/` Source of Truth — How one folder and a generator make three AI agents obey the same rules.

May 31, 2026 ↻

Paraglide-JS i18n for SvelteKit — Adding Korean/English internationalization to a SvelteKit static blog without

May 26, 2026 ↻

Don't Retry Retrieval — Diagnose It — When retrieval comes back weak, the reflex is to retry. Wei et al. (2026) shows retry compounds errors on out-of-distribution queries — diagnose the failure instead.

May 20, 2026 ↻

Claude Code Agent Teams — Experimental feature for orchestrating multiple Claude Code instances as a coordinated team with shared task lists and inter-agent messaging

May 6, 2026 ↻

FastAPI Non-blocking Startup Dependencies — FastAPI lifespan code runs before the application accepts requests. If startup awaits an optional dependency such as Kafka, Cloud Run cold starts can fail health checks and E2E probes even when the API would happily serve routes without it.

→ See all 141 posts