SaaS 스타트업 기술 스택 선택 가이드 2025

// Next.js 15 App Router 기반 SaaS 대시보드 예시
import { auth } from "@/lib/auth"
import { redirect } from "next/navigation"

export default async function DashboardPage() {
  const session = await auth()
  
  if (!session) {
    redirect("/login")
  }
  
  return (
    <div className="container mx-auto p-6">
      <h1 className="text-2xl font-bold">
        안녕하세요, {session.user.name}님
      </h1>
      <DashboardMetrics userId={session.user.id} />
    </div>
  )
}

# FastAPI 기반 SaaS 멀티테넌트 API 예시
from fastapi import FastAPI, Depends, HTTPException
from sqlalchemy.orm import Session
from typing import Annotated

app = FastAPI()

async def get_current_tenant(
    token: str,
    db: Session = Depends(get_db)
) -> Tenant:
    tenant = verify_token_and_get_tenant(token, db)
    if not tenant:
        raise HTTPException(status_code=401, detail="인증 실패")
    return tenant

@app.get("/api/v1/users")
async def get_users(
    tenant: Annotated[Tenant, Depends(get_current_tenant)],
    db: Session = Depends(get_db)
):
    return db.query(User).filter(User.tenant_id == tenant.id).all()

// NestJS 기반 구독 결제 서비스 예시
import { Injectable } from "@nestjs/common"
import Stripe from "stripe"

@Injectable()
export class SubscriptionService {
  private stripe

  constructor() {
    this.stripe = new Stripe(process.env.STRIPE_SECRET_KEY)
  }

  async createSubscription(customerId, priceId) {
    return this.stripe.subscriptions.create({
      customer: customerId,
      items: [{ price: priceId }],
      payment_behavior: "default_incomplete",
      expand: ["latest_invoice.payment_intent"],
    })
  }
}

-- PostgreSQL Row Level Security로 멀티테넌시 구현
CREATE TABLE posts (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  tenant_id UUID NOT NULL REFERENCES tenants(id),
  title TEXT NOT NULL,
  content TEXT,
  created_at TIMESTAMPTZ DEFAULT NOW()
);

-- RLS 정책 설정
ALTER TABLE posts ENABLE ROW LEVEL SECURITY;

CREATE POLICY tenant_isolation ON posts
  USING (tenant_id = current_setting('app.tenant_id')::UUID);

# GitHub Actions CI/CD 파이프라인 예시
name: Deploy to Production

on:
  push:
    branches: [main]

jobs:
  deploy:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Build Docker image
        run: docker build -t saas-app:latest .
      - name: Deploy to ECS
        run: aws ecs update-service --cluster prod --service saas-app --force-new-deployment

# LangChain 기반 AI 기능 통합 예시
from langchain_openai import ChatOpenAI
from langchain_core.prompts import ChatPromptTemplate
import json

class AIFeatureService:
    def __init__(self):
        self.llm = ChatOpenAI(model="gpt-4o", temperature=0)
    
    async def analyze_customer_feedback(self, feedback: str) -> dict:
        prompt = ChatPromptTemplate.from_template(
            "다음 고객 피드백을 분석해서 감정, 카테고리, 우선순위를 JSON으로 반환하세요: {feedback}"
        )
        chain = prompt | self.llm
        result = await chain.ainvoke({"feedback": feedback})
        return json.loads(result.content)