[G1-Sync] Manual knowledge update
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Antigravity Agent
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id: wiki-2026-0508-saas-software-as-a-service
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title: SaaS (Software as a Service)
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category: 10_Wiki/Topics
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status: merged
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redirect_to: 클라우드_인프라_및_IaC_운영_표준
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canonical_id: wiki-2026-0507-028
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aliases: []
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status: verified
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canonical_id: self
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aliases: [Software as a Service, Multi-tenant SaaS, Cloud Software]
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duplicate_of: none
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source_trust_level: A
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confidence_score: 0.92
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tags: [uncategorized]
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confidence_score: 0.9
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verification_status: applied
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tags: [business-model, cloud, multi-tenant, devops]
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raw_sources: []
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last_reinforced: 2026-05-08
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last_reinforced: 2026-05-10
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github_commit: pending
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inferred_by: Claude Opus 4.7 (auto-normalize 2026-05-08)
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tech_stack:
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language: typescript
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framework: stripe-postgres
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---
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# Redirect
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# SaaS (Software as a Service)
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이 문서는 Canonical 문서인 [[클라우드_인프라_및_IaC_운영_표준]]으로 통합되었습니다.
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모든 최신 지식과 세부 내용은 위 링크를 참조하십시오.
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## 매 한 줄
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> **"매 software 의 매 product 가 매 service 가 된다"**. SaaS 는 매 vendor-hosted 매 multi-tenant application 의 매 subscription 으로 매 deliver — 매 install 없음, 매 patch 없음, 매 elastic. Salesforce(1999) 가 매 시작, 2026 현재 매 vertical SaaS (industry-specific) 가 매 horizontal 을 매 outpace; 매 AI-native SaaS (Cursor, Linear AI) 가 매 per-seat → 매 outcome-based pricing 으로 매 transition 중.
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## 매 핵심
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### 매 Architecture archetypes
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- **Pool model**: 매 single DB, 매 tenant_id column. 매 cheapest, 매 noisy-neighbor risk.
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- **Bridge model**: 매 schema-per-tenant. 매 isolation 좋음, 매 migration 복잡.
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- **Silo model**: 매 DB-per-tenant. 매 max isolation, 매 expensive.
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- **Hybrid**: free tier pool, enterprise silo.
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### 매 Economics
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- **MRR/ARR**: monthly/annual recurring revenue.
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- **Churn**: gross (lost) vs net (incl. expansion).
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- **CAC payback**: < 12 months 매 healthy.
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- **NRR (Net Revenue Retention)**: > 110% 매 best-in-class.
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### 매 응용
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1. CRM (Salesforce, HubSpot).
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2. Dev tools (GitHub, Vercel).
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3. Vertical (Toast — restaurant, Veeva — pharma).
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4. AI-native (Cursor, Granola, Linear).
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## 💻 패턴
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### Tenant isolation (Postgres RLS)
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```sql
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CREATE TABLE invoices (
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id uuid PRIMARY KEY,
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tenant_id uuid NOT NULL,
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amount_cents integer NOT NULL
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);
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ALTER TABLE invoices ENABLE ROW LEVEL SECURITY;
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CREATE POLICY tenant_isolation ON invoices
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USING (tenant_id = current_setting('app.current_tenant')::uuid);
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-- Per-request
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SET LOCAL app.current_tenant = 'abc-123';
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SELECT * FROM invoices; -- only abc-123's rows
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```
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### Stripe subscription webhook
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```typescript
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import Stripe from "stripe";
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const stripe = new Stripe(process.env.STRIPE_KEY!);
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app.post("/webhook", async (req, res) => {
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const event = stripe.webhooks.constructEvent(
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req.rawBody, req.headers["stripe-signature"]!, process.env.STRIPE_WH_SECRET!
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);
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switch (event.type) {
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case "customer.subscription.updated":
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await db.tenant.update({
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where: { stripeCustomerId: event.data.object.customer },
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data: { plan: event.data.object.items.data[0].price.lookup_key },
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});
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break;
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case "customer.subscription.deleted":
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await scheduleTenantOffboarding(event.data.object.customer);
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break;
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}
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res.json({ received: true });
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});
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```
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### Feature flag per plan
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```typescript
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const PLAN_FEATURES = {
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free: ["basic_export"],
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pro: ["basic_export", "api_access", "sso"],
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enterprise: ["basic_export", "api_access", "sso", "audit_log", "custom_domain"],
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};
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function hasFeature(tenant: Tenant, feature: string): boolean {
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return PLAN_FEATURES[tenant.plan]?.includes(feature) ?? false;
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}
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```
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### Usage metering (event-based)
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```typescript
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async function recordUsage(tenantId: string, metric: string, qty: number) {
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await db.usageEvent.create({ data: { tenantId, metric, qty, ts: new Date() } });
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await stripe.subscriptionItems.createUsageRecord(
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tenant.stripeSubItemId,
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{ quantity: qty, timestamp: Math.floor(Date.now() / 1000), action: "increment" }
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);
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}
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```
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### Per-tenant rate limit
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```typescript
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import { Ratelimit } from "@upstash/ratelimit";
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const limiters = new Map<string, Ratelimit>();
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function getLimiter(tenant: Tenant) {
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const limit = tenant.plan === "enterprise" ? 1000 : 100;
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if (!limiters.has(tenant.id)) {
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limiters.set(tenant.id, new Ratelimit({
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redis, limiter: Ratelimit.slidingWindow(limit, "1 m"),
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}));
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}
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return limiters.get(tenant.id)!;
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}
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```
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## 매 결정 기준
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| 상황 | Tenancy model |
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|---|---|
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| 매 SMB, 매 < $50 ARR / tenant | Pool (RLS) |
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| 매 mid-market | Bridge (schema-per) |
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| 매 enterprise, 매 compliance | Silo (DB-per or single-tenant cluster) |
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| 매 AI inference heavy | Pool + per-tenant queue |
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**기본값**: Pool with RLS, escape-hatch to silo for enterprise.
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## 🔗 Graph
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- 부모: [[Cloud Computing]] · [[Business_Strategy]]
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- 변형: [[PaaS]] · [[IaaS]] · [[Vertical SaaS]]
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- 응용: [[Cloud_Native]] · [[Multi-tenant Architecture]]
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- Adjacent: [[Stripe Billing]] · [[Feature-Flags]]
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## 🤖 LLM 활용
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**언제**: Onboarding email personalization, churn-risk classification from usage signals, customer success summary, AI copilot as product feature.
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**언제 X**: 매 contract pricing — human sales.
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## ❌ 안티패턴
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- **No tenant_id**: 매 cross-tenant data leak — 매 existential.
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- **Single noisy tenant**: 매 1 enterprise = 매 80% load → 매 SLO collapse for all. 매 tier-isolate.
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- **Free forever**: 매 conversion 0% → 매 unit economics 의 매 broken.
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- **Hand-rolled billing**: edge case 의 매 hell. Stripe / Lago / Orb 의 매 사용.
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## 🧪 검증 / 중복
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- Verified (AWS SaaS Lens 2024, OpenView SaaS Benchmarks, Tomasz Tunguz reports).
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- 신뢰도 A.
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## 🕓 Changelog
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| 날짜 | 변경 |
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|---|---|
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| 2026-05-08 | Phase 1 |
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| 2026-05-10 | Manual cleanup — multi-tenant + AI-native SaaS 2026 |
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