Land more interviews. Upload your resume and a job description; get an ATS-style score, missing keywords, improved bullet suggestions, and a concise cover‐letter draft.

Screenshot Screenshot

• AI tailoring (OpenAI, JSON mode): improved bullets + cover‐letter draft
• ATS insights: match score and missing keywords (lightweight local analysis)
• Auth & history: email/password login and per-user run history (Firestore)
• Free vs Pro: daily free limit vs. unlimited (Stripe subscriptions)
• Billing UX: Upgrade, Manage Billing, and Resume Subscription flows
• Production-ready Next.js app: App Router, TypeScript, Tailwind v4

• Frontend/Server: Next.js (App Router), TypeScript, Tailwind CSS v4
• Auth & Data: Firebase Auth + Firestore
• Billing: Stripe (Checkout + Customer Portal + Webhooks, test mode initially)
• AI: OpenAI Chat Completions (JSON output)
• Hosting: Vercel (Node runtime for API routes)

src/
 app/
 api/
 tailor/route.ts # main generation route
 history/route.ts # user runs
 me/route.ts # plan state for billing buttons
 billing/
 checkout/route.ts # Stripe Checkout
 portal/route.ts # Stripe Customer Portal
 stripe/
 webhook/route.ts # Stripe webhook (raw body, Node runtime)
 (pages + layout)
 components/
 AIForm.tsx # editor + results
 billing/BillingButtons.tsx # plan-aware billing UI
 Section.tsx # simple panel
 (auth/status, footer, etc.)
 lib/
 validators.ts # zod schemas & TailorResponse type
 ats.ts # lightweight ATS keyword coverage
 firebase/ # client & admin init
 stripe.ts # stripe client/server helpers

Body:

{ "resumeText": "string (>=50)", "jobDescription": "string (>=50)" }

Response:

{
 "atsScore": 0,
 "missingKeywords": ["string"],
 "improvedBullets": ["string"],
 "coverLetterDraft": "string"
}

Returns the user’s recent runs from users/{uid}/runs.

Plan state used by the header:

{
 "isPro": true,
 "hasCustomer": true,
 "subscriptionStatus": "active",
 "cancelAtPeriodEnd": false,
 "scheduledCancel": false,
 "currentPeriodEnd": "2025年10月31日T...Z",
 "cancelAt": null
}

Starts a Stripe subscription Checkout session.

Opens the Customer Portal. If the user has no Stripe customer yet, returns 400 { "error": "NO_CUSTOMER" } and the client falls back to Checkout.

Raw-body verified webhook (Node runtime). Updates Firestore plan fields on subscription create/update/delete. Supports flexible billing (may fall back to item period end / cancel_at).

• users/{uid}:
  isPro, stripeCustomerId, stripeSubscriptionId, subscriptionStatus, cancelAtPeriodEnd, scheduledCancel, currentPeriodEnd, cancelAt, canceledAt, stripeUpdatedAt

• users/{uid}/runs/{runId}:
  resumePreview, jdPreview, tailoredResume, coverLetter, bullets, resumeLen, jdLen, atsScore, missingKeywordsCount, improvedBulletsCount, coverLetterLen, model, plan, createdAt

• usage_daily/{uid_YYYY-MM-DD}:
  userId, date, count, createdAt, updatedAt (used for free daily limit; avoids composite index).

• Signed out → "Sign in to upgrade"
• Free or Pro with no Stripe customer → "Upgrade to Pro"
• Pro + customer →
  • If scheduledCancel or cancelAtPeriodEnd → show Resume subscription + Manage Billing + "Access until {date}" (currentPeriodEnd ?? cancelAt)
  • Else just Manage Billing (+ "Access until" when available)

• Richer ATS metrics (skills taxonomy, seniority verbs, readability)
• Shareable public links for runs
• Observability: latency, token usage, failure analytics