ProposalSnap - One-Click Proposal Generator for Service Pros

Q: Who can build ProposalSnap - One-Click Proposal Generator for Service Pros?

This is a beginner level project. Independent tradespeople and service contractors (plumbers, electricians, cleaners) — 4M+ in the US alone, most still using Word or Google Docs for proposals.

Service professionals spend 23+ hours a month writing proposals in Word docs like it's 2003. ProposalSnap lets plumbers, electricians, and cleaners upload job photos, fill one form, and get a client-ready proposal with e-signature in 60 seconds. Stop chasing clients with PDFs attached to apologetic emails.

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Difficulty

beginner

What is it?

The pain is real and expensive: a plumber writing 15 proposals a month loses nearly a full workday every week on formatting, chasing signatures, and manually following up. ProposalSnap solves this with a vertical-specific template engine — upload project photos, enter scope and price, Claude fills the professional narrative, Stripe handles deposits, and DocuSign handles signatures. Three launch verticals (plumbing, electrical, cleaning) keep scope tight and messaging sharp. Built on Next.js with Supabase and Claude API, this ships in two weekends. Every tool in the stack is stable and production-ready today, and the $29-$49/month price point is validated by similar tools like Jobber and Housecall Pro charging 5-10x more for bloated feature sets this audience never uses.

Why now?

Claude vision API makes photo-to-proposal generation practical and cheap in April 2026, and the vibe-coding wave means a solo dev can ship this in a weekend with Cursor — the stack that was painful a year ago is now trivially fast.

▸Vertical-specific proposal templates pre-filled by Claude from photo + scope input (Implementation note: Claude vision on uploaded job photos)
▸One-click e-signature via DocuSign embedded signing ceremony
▸Automated follow-up email sequence if client hasn't signed in 48h via Resend
▸Deposit collection built into proposal via Stripe Payment Links

Target Audience

Independent tradespeople and service contractors (plumbers, electricians, cleaners) — 4M+ in the US alone, most still using Word or Google Docs for proposals.

Example Use Case

Mike, an independent electrician, uploads a photo of a panel replacement job, enters labor and parts cost, hits send — client gets a branded proposal with deposit link and signs in under 2 minutes. Mike closes 40% more jobs because he responds same-day instead of next-week.

User Stories

▸As an independent plumber, I want to generate a proposal from a job photo in under 2 minutes, so that I can respond to clients same-day instead of losing jobs to faster competitors.
▸As a cleaning business owner, I want clients to sign and pay a deposit in one link, so that I stop chasing signatures across email threads.
▸As an electrician with 10 active quotes, I want automated follow-up reminders when clients haven't signed, so that I never lose a job to a forgotten email.

Done When

✓Proposal generation: done when user uploads a photo, fills scope form, clicks generate, and sees a formatted proposal preview in under 10 seconds.
✓E-signature: done when client receives an email, clicks the link, and completes DocuSign signing without leaving the ProposalSnap-branded page.
✓Deposit payment: done when Stripe checkout in the proposal email processes successfully and dashboard shows payment confirmed.
✓Follow-up automation: done when proposal status stays unsigned for 48h and client receives a reminder email without any manual action from the contractor.

Is it worth building?

$39/month x 50 customers = $1,950 MRR at month 2. $39/month x 200 customers = $7,800 MRR at month 5. Math assumes 3% conversion from Facebook trade groups with 50k+ members.

Unit Economics

CAC: $15 via Facebook group DMs and organic posts. LTV: $468 (12 months at $39/month). Payback: 1 month. Gross margin: 78%.

Business Model

SaaS subscription $29/month starter, $49/month pro (unlimited proposals + follow-up reminders)

Monetization Path

14-day free trial, no credit card. Upgrade triggered when user tries to send their 4th proposal.

Revenue Timeline

First dollar: week 2 beta upgrade. $1k MRR: month 2. $5k MRR: month 6.

Estimated Monthly Cost

Claude API: $30, Vercel: $20, Supabase: $25, DocuSign API: $25, Resend: $10, Stripe fees: ~$25. Total: ~$135/month at launch.

Profit Potential

Full-time viable at $5k-$8k MRR.

Scalability

High — add HVAC, landscaping, pest control verticals. Team plans for small crews. White-label for trade associations.

Success Metrics

Week 2: 50 signups from Facebook group posts. Month 1: 20 paid conversions. Month 3: 85% month-1 retention.

Launch & Validation Plan

Post in 3 Facebook contractor groups asking if proposal writing is painful, collect 30 DM responses, offer free beta to first 10 who reply.

Customer Acquisition Strategy

First customer: join 5 Facebook groups for independent plumbers and electricians, post a genuine question about proposal pain, DM the most frustrated commenters with a free 3-month beta offer. Ongoing: Facebook group content, YouTube Shorts showing the 60-second workflow, Google Ads targeting 'proposal software for contractors'.

What's the competition?

Competition Level

Medium

What's the roadmap?

Feature Roadmap

V1 (launch): proposal generation, e-signature, deposit collection, follow-up reminders. V2 (month 2-3): proposal analytics, custom branding, SMS follow-up. V3 (month 4+): team accounts, HVAC and landscaping verticals, QuickBooks sync.

Milestone Plan

Phase 1 (Week 1-2): schema, Claude generation, DocuSign integration live. Phase 2 (Week 3-4): Stripe deposit, Resend follow-ups, landing page, 10 beta users. Phase 3 (Month 2): 20 paid users, ProductHunt launch, Facebook group campaign.

How do you build it?

Tech Stack

Next.js, Claude API, Supabase, Stripe, DocuSign API, Resend — build with Cursor for API routes, Lovable for UI, v0 for proposal preview component

Suggested Frameworks

Next.js App Router, Supabase JS, DocuSign Node SDK

Time to Ship

2 weeks

Required Skills

Next.js, Claude API integration, DocuSign API, Stripe billing.

Resources

Claude API docs, DocuSign quickstart, Supabase auth guide, Stripe checkout docs.

MVP Scope

app/page.tsx (landing + hero CTA), app/dashboard/page.tsx (proposal list), app/proposals/new/page.tsx (multi-step form), app/api/generate/route.ts (Claude proposal generation), app/api/signature/route.ts (DocuSign envelope create), app/api/deposit/route.ts (Stripe link creation), lib/db/schema.ts (Drizzle schema), components/ProposalPreview.tsx (live preview card), .env.example (all required env vars), seed.ts (3 demo proposals pre-loaded)

Core User Journey

Sign up -> pick vertical template -> upload photo + enter scope -> send proposal -> client signs + pays deposit in one link.

Architecture Pattern

User uploads photo + fills form -> Claude API generates proposal text -> DocuSign API creates envelope -> client receives email link -> signs -> webhook fires -> Supabase updates status -> Resend sends confirmation.

Data Model

User has many Proposals. Proposal has one Template (vertical-specific). Proposal has one SignatureStatus. Proposal has one DepositPayment.

Integration Points

Claude API for proposal text generation, DocuSign API for e-signatures, Stripe for deposit collection, Supabase for database and auth, Resend for follow-up emails, Vercel for hosting.

V1 Scope Boundaries

V1 excludes: recurring invoices, scheduling, mobile app, team accounts, custom branding, API access.

Success Definition

A plumber in a Facebook group finds the product, creates and sends a signed proposal to a client, collects a deposit, and renews their subscription after month one without any founder involvement.

Challenges

Distribution is the hardest part — tradespeople don't browse ProductHunt. Facebook groups for contractors, NFIB forums, and local trade association newsletters are the real channels, and they require manual hustle to crack.

Avoid These Pitfalls

Do not build a full CRM — scope creep into scheduling and invoicing will kill the two-week ship target. Do not skip DocuSign sandbox testing before launch, envelope creation errors are silent failures. Finding first 10 customers takes longer than building — budget 3x more time for Facebook group outreach than development.

Security Requirements

Supabase Auth with Google OAuth, RLS on all proposal rows, rate limiting 60 req/min per IP via Next.js middleware, file upload validation (image types only, 10MB max), GDPR data deletion endpoint.

Infrastructure Plan

Vercel for Next.js hosting, Supabase for Postgres and Storage, GitHub Actions for CI, Sentry for errors, dev/staging/prod via Vercel environments. Total infra: ~$135/month.

Performance Targets

100 DAU at launch, 500 req/day. Claude API call under 8s. Page load under 2s LCP. Proposal list cached with SWR, static assets on Vercel CDN.

Go-Live Checklist

☐Security audit complete.
☐Payment flow tested end-to-end.
☐Sentry error tracking live.
☐Vercel monitoring dashboard configured.
☐Custom domain with SSL active.
☐Privacy policy and terms published.
☐5 beta contractors signed off.
☐Rollback plan: revert to previous Vercel deployment.
☐Launch post drafted for Facebook groups and Reddit r/Entrepreneur.

First Run Experience

On first run: 3 demo proposals (plumbing, electrical, cleaning) are pre-loaded with sample photos, generated text, and mock signature status. User can immediately click through a full proposal, preview it as a client, and trigger a test send. No manual config required: Supabase seed runs automatically, DocuSign sandbox is pre-configured in .env.example.

How to build it, step by step

1. Define Drizzle schema for User, Proposal, SignatureEnvelope, DepositPayment in lib/db/schema.ts. 2. Run npx create-next-app with Tailwind and App Router. 3. Install Supabase JS, configure auth with Google OAuth and RLS on proposals table. 4. Build multi-step proposal form in app/proposals/new/page.tsx with photo upload to Supabase Storage. 5. Create app/api/generate/route.ts calling Claude API with photo URL and scope to return formatted proposal text. 6. Wire DocuSign Node SDK in app/api/signature/route.ts to create embedded envelope and return signing URL. 7. Create app/api/deposit/route.ts that generates a Stripe Payment Link and embeds it in the client email. 8. Build ProposalPreview.tsx component that renders live proposal as client will see it. 9. Set up Resend follow-up email triggered 48h after send if envelope status is not signed. 10. Deploy to Vercel, seed 3 demo proposals, walk full journey from photo upload to signed envelope end-to-end.

Generated

April 29, 2026

Model

claude-sonnet-4-6

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Disclaimer: Ideas on this site are AI-generated and may contain inaccuracies. Revenue estimates, market demand figures, and financial projections are illustrative assumptions only — not financial advice. Do your own research before making any business or investment decisions. Technology availability, pricing, and market conditions change rapidly; always verify details independently.