OnboardLink - Single Magic Link for Client Contracts, Invoices, and Payments

Q: Who can build OnboardLink - Single Magic Link for Client Contracts, Invoices, and Payments?

This is a beginner level project. Solopreneurs, coaches, freelancers, and consultants — estimated 59M freelancers in the US, with 2M+ actively complaining about client onboarding friction on Twitter and Reddit monthly.

Q: How does OnboardLink - Single Magic Link for Client Contracts, Invoices, and Payments make money?

SaaS $49/month flat, unlimited onboarding flows and clients. Free tier: 3 client completions. Paid plan unlocks unlimited clients and custom branding. Conversion triggered at 3rd client onboarding.

Solopreneurs send 4 separate emails to onboard a new client — intake form, contract PDF, invoice link, payment confirmation — and clients ghost halfway through because the friction is a full-time job. OnboardLink collapses the entire sequence into one shareable link that walks clients through intake, signature, and payment in under 5 minutes. Your new client onboarding just became a product.

𝕏 Post Reddit HN

Difficulty

beginner

What is it?

The current workaround is embarrassing: a coach sends a Typeform link, then manually emails a DocuSign PDF, then shares a Stripe Payment Link, then follows up three times when the client stops at step two. OnboardLink pre-builds five template flows (service contract, freelance NDA, coaching agreement, retainer, project kickoff) that combine intake form, contract signing, and payment into one hosted URL. The builder is a drag-and-connect flow editor — connect the steps, set your price, copy the link, send it to your client. Built on Next.js, Supabase, Stripe, and DocuSign, with zero custom backend needed. Comparable to HoneyBook but stripped to the one workflow that actually matters, at $49/month instead of $19 per feature add-on. This ships in two weeks because every API in the stack has stable SDKs and documented webhooks as of today.

Why now?

The April 2026 vibe-coding wave means a solo dev can ship a polished multi-step workflow app with React Flow and Supabase in a weekend — the same product would have taken 3 months two years ago, and the solopreneur economy keeps growing with no sign of slowing.

▸Drag-and-connect flow builder: link intake form, contract, and payment steps in any order (Implementation note: React Flow for visual editor)
▸5 pre-built templates: service contract, coaching agreement, freelance NDA, retainer, project kickoff
▸DocuSign embedded signing — client signs without leaving the OnboardLink page
▸Stripe payment step with deposit or full payment option, webhook confirms completion

Target Audience

Solopreneurs, coaches, freelancers, and consultants — estimated 59M freelancers in the US, with 2M+ actively complaining about client onboarding friction on Twitter and Reddit monthly.

Example Use Case

Sara, a business coach, builds a coaching agreement flow in 8 minutes, sends one link to a new client, the client fills intake, signs the contract, and pays the first month in under 4 minutes — Sara gets a Slack notification and the money is in her account before the client even closes the tab.

User Stories

▸As a business coach, I want to send one link that handles intake, contract, and payment, so that new clients are fully onboarded before our first call.
▸As a freelance designer, I want a pre-built NDA template I can configure in 5 minutes, so that I stop losing time formatting contracts for every new project.
▸As a consultant with 8 active clients, I want to see which clients have completed their onboarding steps, so that I can follow up only with those who are stuck.

Done When

✓Flow builder: done when user drags intake, signature, and payment steps into a sequence and saves a shareable link without writing any code.
✓Client signing: done when client opens the magic link, completes the intake form, and signs the contract in a DocuSign-embedded iframe without leaving the page.
✓Payment collection: done when Stripe checkout processes successfully after signature and client sees a confirmation screen with next steps.
✓Status dashboard: done when coach opens their dashboard and sees real-time completion status (intake done, signed, paid) for each active client session.

Is it worth building?

$49/month x 30 customers = $1,470 MRR at month 2. $49/month x 150 customers = $7,350 MRR at month 5. Assumes 4% conversion from Twitter/X solopreneur audience with cold DM + content strategy.

Unit Economics

CAC: $20 via Twitter DMs and content. LTV: $588 (12 months at $49/month). Payback: 1 month. Gross margin: 80%.

Business Model

SaaS $49/month flat, unlimited onboarding flows and clients

Monetization Path

Free tier: 3 client completions. Paid plan unlocks unlimited clients and custom branding. Conversion triggered at 3rd client onboarding.

Revenue Timeline

First dollar: week 3 beta conversion. $1k MRR: month 2. $5k MRR: month 6.

Estimated Monthly Cost

Supabase: $25, Vercel: $20, DocuSign API: $25, Stripe fees: ~$35, Resend: $10. Total: ~$115/month at launch.

Profit Potential

Full-time viable at $5k-$10k MRR.

Scalability

High — add agency team plans, white-label flows, Zapier integration, and CRM sync at V2.

Success Metrics

Week 2: 40 waitlist signups. Month 1: 15 paid. Month 2: 60% of paid users sent at least one client link.

Launch & Validation Plan

Post a Twitter thread about client onboarding pain, DM the 20 most engaged replies offering free lifetime access for feedback, collect 10 real onboarding flows from beta users before launch.

Customer Acquisition Strategy

First customer: DM 20 coaches and freelancers on Twitter/X who have posted about client onboarding problems in the last 30 days, offer 3 months free for a 15-minute feedback call. Ongoing: ProductHunt launch, IndieHackers, Reddit r/freelance, YouTube tutorial on the 5-minute client onboarding setup.

What's the competition?

Competition Level

Medium

What's the roadmap?

Feature Roadmap

V1 (launch): flow builder, 5 templates, e-signature, payment, status dashboard. V2 (month 2-3): custom branding, Zapier trigger, client reminder emails. V3 (month 4+): team plans, recurring payment flows, CRM sync.

Milestone Plan

Phase 1 (Week 1-2): schema, flow builder, DocuSign and Stripe integration live. Phase 2 (Week 3-4): client session tracking, webhooks, landing page, 10 beta users. Phase 3 (Month 2): 20 paid users, ProductHunt launch, IndieHackers post.

How do you build it?

Tech Stack

Next.js, Supabase, Stripe, DocuSign API, Resend, Typeform API — build with Lovable for the flow builder UI, Cursor for API routes, v0 for step components

Suggested Frameworks

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

Time to Ship

2 weeks

Required Skills

Next.js, Stripe webhooks, DocuSign embedded signing, Supabase RLS.

Resources

DocuSign embedded signing docs, Stripe checkout docs, Supabase quickstart, Resend API docs.

MVP Scope

app/page.tsx (landing + hero), app/dashboard/page.tsx (flow list), app/flows/builder/page.tsx (drag-connect editor), app/flows/[id]/page.tsx (client-facing onboarding page), app/api/flows/route.ts (CRUD), app/api/signature/route.ts (DocuSign envelope), app/api/payment/route.ts (Stripe session), app/api/webhooks/route.ts (Stripe + DocuSign status), lib/db/schema.ts (Drizzle schema), components/FlowStep.tsx (step card UI), .env.example (required env vars), seed.ts (5 pre-built template flows)

Core User Journey

Sign up -> pick template -> configure price and contract -> copy link -> send to client -> client signs and pays in one session.

Architecture Pattern

User builds flow in editor -> flow saved to Supabase -> client opens magic link -> completes Typeform intake -> DocuSign envelope created on completion -> client signs -> Stripe session created -> payment completes -> webhooks update flow status -> Resend fires confirmation to both parties.

Data Model

User has many Flows. Flow has many Steps (intake, signature, payment). Flow has many ClientSessions. ClientSession tracks completion status per step.

Integration Points

Stripe for payment collection, DocuSign API for e-signatures, Supabase for database and auth, Resend for confirmation emails, Vercel for hosting.

V1 Scope Boundaries

V1 excludes: custom branding, team accounts, Zapier integration, CRM sync, mobile app, recurring billing flows.

Success Definition

A freelance coach finds OnboardLink on ProductHunt, builds a coaching agreement flow in under 10 minutes, sends it to a real client, the client completes the full sequence without asking the coach a single question, and the coach renews their subscription at month two.

Challenges

DocuSign API has a steep sandbox-to-production approval process that can delay launch by 1-2 weeks — test this first before building any UI. Distribution reality: solopreneurs on Twitter/X are a loud audience but low conversion; LinkedIn and IndieHackers communities convert better for B2B tools.

Avoid These Pitfalls

Do not build a full contract editor in V1 — use pre-built templates and let users paste their own text into a single field. Do not underestimate DocuSign sandbox approval time — apply for production access on day one of building. Finding your first 10 paying customers will take longer than building the product — budget 3x more time for DMs and community posts than code.

Security Requirements

Supabase Auth with Google OAuth, RLS on all flow and session rows scoped to owner, input sanitization on contract text fields, rate limiting 60 req/min per IP, GDPR data deletion endpoint for client session data.

Infrastructure Plan

Vercel for hosting, Supabase for Postgres and auth, GitHub Actions for CI, Sentry for error tracking, dev/staging/prod via Vercel preview branches. Total: ~$115/month.

Performance Targets

100 DAU at launch, 600 req/day. Client onboarding page load under 2s. DocuSign iframe load under 4s. Flow list cached with React Query, CDN for static assets.

Go-Live Checklist

☐Security audit complete.
☐Payment flow tested end-to-end with real Stripe card.
☐Sentry error tracking configured.
☐Vercel analytics dashboard live.
☐Custom domain with SSL active.
☐Privacy policy and terms published.
☐5 beta solopreneurs signed off.
☐Rollback plan: previous Vercel deployment tagged.
☐Launch post drafted for ProductHunt and Twitter.

First Run Experience

On first run: 5 pre-built template flows (coaching agreement, freelance NDA, service contract, retainer, project kickoff) appear in the dashboard ready to customize. User can immediately open a template, change the price and contract text, and preview the client experience. No manual config required: seed runs on first auth, DocuSign sandbox envelope is pre-configured in .env.example with test credentials.

How to build it, step by step

1. Define Drizzle schema for User, Flow, FlowStep, ClientSession, SignatureEnvelope, PaymentRecord in lib/db/schema.ts. 2. Run npx create-next-app with Tailwind and App Router, install React Flow for the visual editor. 3. Configure Supabase Auth with Google OAuth and RLS on flows and client_sessions tables. 4. Build the flow builder in app/flows/builder/page.tsx using React Flow nodes for intake, signature, and payment steps. 5. Create app/api/flows/route.ts for CRUD operations on flow configs stored in Supabase. 6. Build the client-facing page app/flows/[id]/page.tsx that reads flow config and renders each step in sequence. 7. Wire DocuSign embedded signing in app/api/signature/route.ts — create envelope, return signing URL, embed in iframe. 8. Create Stripe checkout session in app/api/payment/route.ts triggered after DocuSign webhook confirms signature. 9. Set up app/api/webhooks/route.ts to handle Stripe payment.succeeded and DocuSign envelope.completed events and update ClientSession status. 10. Seed 5 template flows, deploy to Vercel, walk full client journey from link open to payment confirmation without touching the dashboard.

Generated

April 29, 2026

Model

claude-sonnet-4-6

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