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Notes from building production software — architecture, realtime systems, offline-first apps and migrations.

4 posts

Why I Picked Server-Sent Events Over WebSockets for a Restaurant POS

Almost all realtime traffic in a restaurant platform flows server → client. Here's how TableTab streams order status, kitchen boards and menu availability with plain SSE in NestJS — and where the sharp edges were.

September 2, 20263 min readRead

Permissions in NestJS Where Nobody Gets a Free Pass — Not Even the Owner

Role checks scattered across controllers drift out of sync with what the admin UI promises. Here's the grant-driven permission guard I built for a multi-tenant SaaS, with per-module grants that apply without re-login.

August 28, 20263 min read

Keeping a Web POS Selling When the Wi-Fi Drops

A restaurant can't stop taking orders because the router rebooted. How I added an offline fallback mode to TableTab's POS with an IndexedDB menu snapshot, a local order queue, and automatic sync on reconnect.

August 20, 20263 min read

Migrating a Production SaaS From Vue 2 to Vue 3 Without a Rewrite

Lessons from moving legacy Vue 2 modules in a large SaaS to Vue 3: why a big-bang rewrite was off the table, how the compat build buys you time, and the breaking changes that actually bite.

July 15, 20263 min read