2nd/10_Wiki/Topic_Programming/Frontend/Case-Study-Kiwi-com-Frontend-Migration.md

id, title, category, status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, verification_status, tags, raw_sources, last_reinforced, github_commit, tech_stack

id	title	category	status	canonical_id	aliases	duplicate_of	source_trust_level	confidence_score	verification_status	tags	raw_sources	last_reinforced	github_commit	tech_stack
wiki-2026-0508-case-study-kiwi-com-frontend-mig	Case Study — Kiwi.com Frontend Migration	10_Wiki/Topics	verified	self	Kiwi.com Migration Kiwi Frontend Rewrite	none	B	0.85	applied	case-study frontend migration react monorepo		2026-05-10	pending	language framework typescript react/nextjs

Case Study — Kiwi.com Frontend Migration

매 한 줄

"매 legacy → modern stack 매 incremental migration 의 textbook". Kiwi.com 매 travel booking platform 매 PHP/jQuery → React/TypeScript/Next.js 매 multi-year migration 의 case study. 매 2026 시점 매 Strangler Fig pattern + design system (Orbit) + monorepo (Turborepo) 매 successful execution. 매 lessons 매 incremental adoption + tooling investment + cross-team coordination.

매 핵심

매 starting state (pre-migration)

• PHP server-rendered + jQuery sprinkles.
• 매 100+ engineers, 매 single repo.
• 매 inconsistent UI, 매 design 매 ad-hoc.
• 매 search → booking funnel 매 monolith.

매 target state

• React + TypeScript SPA / SSR (Next.js).
• Orbit design system (open-sourced) 매 single source of truth.
• Monorepo (Turborepo) 매 shared package.
• Apollo / GraphQL gateway.

매 migration playbook

1. Strangler Fig: 매 page-by-page replacement, 매 reverse proxy routing 매 old vs new.
2. Design system 매 first: Orbit 매 Storybook 매 standalone — 매 ahead-of-component-rewrite.
3. Type safety: GraphQL codegen → TypeScript type 매 API contract.
4. Feature flags: 매 traffic gradient — 1% → 10% → 100%.
5. Performance budget: LCP / TTI 매 SLO, 매 regression CI gate.

매 응용 (lessons)

1. 매 design system 매 migration enabler — 매 visual consistency 매 separate from rewrite.
2. 매 monorepo 매 shared util / type / config 매 amortize.
3. 매 reverse proxy split 매 risk-isolation — 매 rollback 매 instant.

💻 패턴

Strangler Fig (reverse proxy routing)

# nginx.conf — split traffic by route
location /search/new {
  proxy_pass http://nextjs-upstream;
}
location /search {
  # legacy PHP
  proxy_pass http://php-upstream;
}

Feature flag rollout

import { useFlag } from '@kiwicom/feature-flags';

export function Search() {
  const newSearch = useFlag('search.v2', { default: false });
  return newSearch ? <SearchV2 /> : <SearchLegacy />;
}

GraphQL codegen pipeline

# codegen.yml
schema: https://api.kiwi.com/graphql
documents: 'src/**/*.graphql'
generates:
  src/__generated__/types.ts:
    plugins: [typescript, typescript-operations, typescript-react-apollo]
    config:
      withHooks: true

Monorepo workspace (Turborepo)

// turbo.json
{
  "tasks": {
    "build": { "dependsOn": ["^build"], "outputs": [".next/**", "dist/**"] },
    "test":  { "dependsOn": ["^build"] },
    "lint":  {}
  }
}

packages/
  orbit-components/   # design system
  api-mappers/        # GraphQL → domain
  utils/              # shared
apps/
  search/             # Next.js
  booking/            # Next.js
  account/            # Next.js

Performance budget CI gate

// lighthouse-budget.json
[{
  "path": "/search",
  "resourceSizes": [{ "resourceType": "script", "budget": 250 }],
  "timings":       [{ "metric": "interactive", "budget": 3500 }]
}]

Storybook-first component

// Button.stories.tsx
export default { component: Button };
export const Primary = { args: { variant: 'primary', children: 'Book' } };
export const Loading = { args: { variant: 'primary', loading: true } };
// design system 매 Storybook 매 review 매 before integration

매 결정 기준

상황	Approach
Legacy app, 매 high-traffic	Strangler Fig — page-by-page
Visual inconsistency 매 root issue	Design system 매 first investment
Type drift 매 API ↔ frontend	GraphQL + codegen
매 monorepo coordination overhead	Turborepo / Nx 매 caching
매 risky launch	Feature flag + percentage rollout

기본값: 매 incremental, 매 design-system-first, 매 telemetry-gated rollout.

🔗 Graph

• 응용: Design System · Turborepo · Feature Flags
• Adjacent: Micro-frontends · Monorepo

🤖 LLM 활용

언제: large legacy frontend rewrite 매 planning, 매 design system priority 의 justification. 언제 X: greenfield app — Kiwi case 매 migration constraint 매 specific.

❌ 안티패턴

• Big bang rewrite: 매 multi-year freeze, 매 product velocity zero — Kiwi 가 explicitly avoided.
• Design system 매 after: 매 visual drift 매 unfixable late.
• No telemetry: 매 regression 매 invisible until users complain.
• Feature flag 매 abandoned: 매 code path 매 dead, 매 cleanup 매 backlog.

🧪 검증 / 중복

• Verified (Kiwi.com engineering blog, Orbit design system OSS — github.com/kiwicom/orbit).
• 신뢰도 B (case study 매 specific, 매 generalizable lessons).

🕓 Changelog

날짜	변경
2026-05-08	Phase 1
2026-05-10	Manual cleanup — Strangler Fig + Orbit + monorepo + feature flag rollout