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React 19Next.js 15ViteTypeScriptProduction-Grade

React.js Development Agency — Production Apps at Scale

Your React App Ships Fast — Or It Bleeds Users Every Second It Stalls

90+
Lighthouse score
Mobile, production build
4–8 weeks
Typical timeline
MVP to full product
$25K–$180K
Project range
Scope and complexity dependent
5,000+
Sites shipped
Since 2012
What Actually Ships When You Hire a React Agency — And What Breaks Six Months Later

Your React app goes live, traffic hits, and one of two things happens: it holds steady at 90+ Lighthouse under load, or it stalls at 2.4s Time to Interactive and your bounce rate climbs into the 60% range. A React.js development agency builds the first kind — component architectures on React 19 Server Components, Next.js 15 App Router with edge SSR, TypeScript across every file, and Playwright coverage that blocks merges below 90%. Your team gets a fixed-scope SOW, weekly staging deploys, and a production handoff with monitoring, error tracking, and runbook docs. The difference between us and an offshore quote is what survives past the demo: your app handles real traffic, passes accessibility audits, and doesn't collapse when your product team ships an update nine months later. We staff senior engineers — minimum five years shipping React in production — and assign a dedicated tech lead to your engagement. That's what your business actually needs from a React shop.

專案失敗的原因

Your current app scores below 50 on Lighthouse and users bounce before the page finishes loading. Every 100ms of load time costs roughly 1% in conversion — a slow React app is bleeding revenue daily.
The offshore team delivered a working demo, but the codebase has no tests, no types, and no documentation. Your next hire will spend 3–6 months untangling spaghetti before they ship a single feature.
You're stuck on Create React App or an old Next.js version and can't adopt Server Components or the App Router. Technical debt compounds — migration costs double roughly every 12 months you wait.
Designers hand off Figma files and what comes back looks nothing like the spec on mobile. Rework cycles eat 20–40% of your sprint velocity when there's no design-to-code review loop.
You don't have a CI/CD pipeline, so every deploy is a manual, nerve-wracking push to production. One bad merge on a Friday afternoon takes down your app and you don't find out until Monday.
Your React app works but your engineering team can't explain why it's slow or how to fix it. Without profiling and bundle analysis, you're guessing — and guessing doesn't survive a traffic spike.

我們構建的內容

Lighthouse score under 50 and your page takes 3+ seconds to render — users are bouncing before they see your product

React 19 Server Components cut your JavaScript bundle in half and render faster on every device your buyers use

Offshore team delivered a working demo but left behind untested, untyped spaghetti that no engineer wants to touch

Next.js 15 App Router with parallel routes and streaming SSR deployed to Vercel edge for sub-200ms TTFB globally

Stuck on Create React App or Next.js 12 and can't adopt Server Components without a full rewrite

Vite builds for standalone SPAs that don't need SSR — instant HMR in dev, production bundles under 150KB gzipped

Figma handoffs look perfect in the design file but ship broken on mobile because there's no review loop

TypeScript end-to-end, Vitest unit coverage, Playwright E2E suite, CI that blocks any merge dropping below your threshold

No CI/CD pipeline so every deploy is a manual push and one bad Friday merge takes down production until Monday

Supabase auth and Postgres with row-level security, OAuth flows, magic links, real-time subscriptions wired into your components

Your React app works but nobody on your team can profile why it's slow or fix it when traffic spikes

Lighthouse budgets enforced in CI, Core Web Vitals tracked in Vercel Analytics, Sentry error monitoring from day one

我們的流程

01

Scope and Architecture Review

We audit your existing codebase or requirements, define the component architecture, and deliver a fixed-scope SOW with line-item estimates.
Week 1
02

Design System + Data Layer

We build your component library in Storybook, wire up Supabase schemas, and establish the TypeScript interfaces that every feature builds on.
Week 2–3
03

Feature Sprints

Two-week sprints with staging deploys every Friday — you review working software in a real browser, not a slide deck.
Week 3–6
04

Performance + QA Pass

Lighthouse audits, bundle analysis, Playwright E2E runs, accessibility checks against WCAG 2.2 AA, and load testing up to your target concurrency.
Week 6–7
05

Production Deploy + Handoff

We deploy to Vercel with preview environments, configure monitoring and alerting, and hand over documentation, runbooks, and a 30-day support window.
Week 7–8

常見問題

React.js 專案在你們機構需要多少錢?

大多數專案的成本在 $25K 到 $180K 之間。具有身份驗證、幾個 CRUD 流程和部署的限定 MVP 通常在 4–6 週內花費 $25K–$50K。具有即時功能、管理儀表板和第三方整合的完整產品構建在 8–14 週內花費 $80K–$180K。我們按固定範圍的 SOW 定價——你會在我們寫一行程式碼之前知道數字。沒有按小時計費的驚喜。

React 應用程式的典型時間表是什麼?

大多數專案是 4–8 週。第一週是架構和範圍確定。第二到六週是功能衝刺,每週部署到測試環境。第六到八週涵蓋 QA、效能調優和生產交付。具有複雜整合的較大構建可以延伸到 12–14 週,但我們會在 SOW 中提前標記。

為什麼選擇 React 19 和 Next.js 15 而不是其他框架?

React 大約佔生產網路應用程式的 40%——你的下一位員工已經知道它。React 19 新增了伺服器元件和操作,這意味著更少的用戶端 JavaScript 和更快的頁面加載,無需放棄生態系統。Next.js 15 的應用路由器為我們提供了串流 SSR、Vercel 上的邊緣渲染和基於檔案的路由,使程式碼庫在規模上保持可導航。我們評估過 Svelte、Solid 和 Astro——它們對於特定用例很好——但對於需要在 3–5 年內招聘、維護和迭代的團隊,React 和 Next.js 是務實的選擇。

典型專案中工程團隊有多大?

2–4 位工程師加上一位專屬技術主管。技術主管負責架構決策、程式碼審查和你的每週同步。工程師都是資深人員——至少擁有五年的 React 生產環境工作經驗。我們不會用初級工程師補位,也不會在衝刺期間更換人員。在專案啟動前,你會認識團隊中的每一個人。

你們保證 Lighthouse 效能分數嗎?

是的。我們承諾在 Lighthouse 效能、可訪問性、最佳實踐和 SEO 上達到 90+——在生產版本上測量,在行動裝置上,在節流的 4G 連線上。我們在 CI 中嵌入效能預算,以確保分數在交付後不會下降。如果我們在啟動時沒有達到 90+,我們會免費修復。

專案交付後會發生什麼?

每項參與都包括啟動後 30 天的支援期,用於錯誤修復和設定問題。之後,我們提供月度保留期,起價為 $5K,用於持續功能工作、效能監控和依賴項更新。我們還會交付完整的文件——架構圖、Storybook 中的元件文件、CI/CD 手冊和環境設定指南——這樣你的內部團隊可以乾淨地接管,如果你願意的話。

你們能使用我們現有的 React 程式碼庫嗎?

絕對可以。我們大約 40% 的參與都是從現有程式碼庫開始的。我們會在第一週進行技術審計——捆綁大小、測試覆蓋率、TypeScript 採用、依賴項健康狀況和效能分析。你會獲得一份書面報告,其中包含優先級建議和遷移路徑,如果你使用的是較舊的 React 或 Next.js 版本。我們已經進行過無數次從 CRA 到 Vite、Pages Router 到 App Router 以及 JavaScript 到 TypeScript 的遷移。

與招聘離岸 React 團隊相比,你們如何比較?

離岸團隊看起來每小時 $30–$50 便宜得多。實際上,我們看到客戶在花費 $40K–$80K 進行離岸構建後來找我們,這些構建缺乏測試、附帶 300KB+ 的 JavaScript 捆綁,並在第一次真正的 QA 審查時中斷。我們的固定範圍定價意味著你提前知道總成本。我們的工程師在 Vercel 和 Supabase 上已經交付了數千個 React 應用程式——他們不會把你的預算花在學習堆棧上。你會獲得每週的測試環境部署、低於 200ms 的 TTFB 和你的下一位員工實際上能讀的程式碼庫。

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