§ 05 · Domain mastery

React Engineering

Next.js, Remix, React Native — frontends built like furniture, joinery visible.

React frontends built like furniture — square, joinery visible, tested. Next.js and Remix on the web, React Native on mobile, all sharing state, tokens, and a testing spine that survives contributors. Server components used where they earn their keep; client boundaries drawn on purpose.

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§ I

Pillars

01

Server components with intent

The server/client boundary is a design decision, not a lint config. RSC where it eliminates JS; client where interactivity demands it.

02

Data-loading patterns that scale

Route-level loaders, suspense boundaries, and cache invalidation that survives the third contributor. No useEffect-fetches sprawl.

03

Component-driven with tests

Storybook as the workshop, Vitest for logic, Playwright for the golden paths. The testing spine that keeps velocity from decaying.

04

React Native + OTA updates

Expo with EAS Update, code-push pipelines, native modules only when they earn it. Cross-platform without pretending native doesn't exist.

05

Design tokens across web + mobile

One tokens source, generated for CSS, RN styles, and Tailwind. Rebrand day is a config change, not a sprint.

06

Bundle discipline

Route-level code splitting, third-party dependency budget, tree-shaking that actually works. Lighthouse scores tracked as a gate, not a report.

§ II

Domain vocabulary

The words that separate insiders from readers.

Server componentReact that renders on the server and ships zero JS. Teams that say 'RSC' but useEffect everywhere haven't crossed the mental bridge.
Suspense boundaryWhere the tree waits versus where it falls back. Drawing boundaries badly is why apps flash-of-loading everywhere.
HydrationThe moment server HTML wakes up client JS. Hydration mismatch is where SSR bugs live and where junior devs go quiet.
Cache tagNext.js's fine-grained cache invalidation. Learning it correctly is what separates 'my ISR is stale' from a working system.
React CompilerThe auto-memoizer. Insiders know when it helps, when it doesn't, and when useMemo is still the right answer.
Concurrent renderingReact's ability to interrupt itself. useTransition and startTransition aren't decoration — they're perf tools.
New Architecture (RN)React Native's Fabric + TurboModules. Whether your app is on it decides how future bug reports read.
Streaming SSRSending HTML as it renders instead of all-at-once. The difference between a fast TTFB and a hopeful one.
§ III

Open problems we help with

§ IV

What we ship

  1. 01A Next.js or Remix app with route-level data and drawn client boundaries.
  2. 02A React Native app on Expo with OTA updates and a native-module escape hatch.
  3. 03A design-tokens pipeline feeding web and mobile.
  4. 04Storybook plus Vitest plus Playwright — configured, not aspirational.
  5. 05Lighthouse and bundle-size gates in CI.
  6. 06A handover: docs, tests, and a team not asking us for permission.
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