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5 Vercel Edge Config A/B Tests That Lifted My Shopify CTR
5 Edge Config A/B test patterns for Shopify storefronts, with Middleware snippets and measured lifts.
The Lab · Written in the open · Tagged Development
Lab.
Working notes from the studio. The tools I build, the workflows I keep, the mistakes I paid for.
170 entries · latest 2026-09-11
9 min read
View Transitions API: 5 Patterns I Use Across RAXXO Sites in 2026
Same-document transitions wrap state changes like filter chips and tab switches in a single startViewTransition call.
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SQLite is Enough: 5 RAXXO Services I Moved Off Postgres
Moved 5 RAXXO services off Postgres + Neon to SQLite + better-sqlite3 in WAL mode
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Replacing Lodash with Native ES2026: groupBy, fromAsync, toReversed, and 5 More
Lodash adds about 70KB minified, ES2026 covers most utility uses with zero dependencies
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Effect-TS in Production: 4 Patterns I Use Across Shopify Backends
Effect-TS replaced try/catch and ad-hoc retries across 3 Shopify backends and cut error-handling code by roughly 40 percent
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PostHog Cloud EU to Self-Hosted: Cost Math and 4 Gotchas I Hit
PostHog Cloud EU bill crossed 180 EUR/month at ~3M events, so I migrated to a self-hosted Hetzner box…
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Replacing Webpack DevServer With Bun Hot Reload: 14 Lines, 3.2x Faster
Webpack DevServer ate 250MB and took 4.1s to start
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Server-Sent Events Beat WebSockets for 80% of My AI Streaming UIs: 5 Patterns
Server-Sent Events handle 80% of AI streaming UIs with one HTTP connection and zero WebSocket overhead. 5 production…
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PostHog Error Tracking Killed My Sentry Bill
Sentry cost me 80 EUR/month for ~12k errors that PostHog now catches on the free tier
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Shopify Functions Replaced 8 Apps In One Saturday
Cancelled 8 paid apps in one Saturday and dropped 180 EUR/month off the app bill to zero recurring…
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Bun Shell Replaced Every Bash Script in My Studio
I deleted 1,400 lines of bash and 23 scripts, replaced by 600 lines of Bun Shell TypeScript
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Neon Database Branching Saved Me 200 EUR Every Month
I run 14 Neon database branches per project for the price of one Postgres instance