I will built this exact flow

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Shengjun Li
built this exact flow
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built this exact flow

About this gig

Stop paying $3,000+ for a demo-quality MVP. I build lean, production-ready SaaS MVPs on a modern stack so you can validate your idea, charge customers, and scale without a rewrite.


What's included:

Next.js (App Router) + Tailwind CSS frontend

Firebase Authentication (email/password + Google) with protected routes

Stripe Checkout for one-time or subscription billing

Firestore database with clean data models

A dashboard for your users (and an admin view for you)

The one core flow that makes your product work

Deployed on Vercel, with code in a Git repo


I've built real paid products with this exact stack (multi-step onboarding + Stripe + Firebase), so I know where MVPs break: auth edge cases, webhook handling, empty states, and validation.


Tell me your idea and I'll turn it into a working MVP you can show to real users usually within 12 weeks.

  • Programming language

    • JavaScript

  • Expertise

    • Performance
    • Security
    • Databases

  • Frontend framework

    • Next.js
    • React.js

  • Backend framework

    • Next.js

Get to know Shengjun Li

Shengjun Li

US LLCs for global founders

  • FromUnited States
  • Member sinceJul 2025

  • Languages

    English
200+ US companies formed for foreign founders. No SSN needed. All 50 states. What I do: • LLC formation (WY $60/yr, DE, NV, all states) • Registered Agent service • EIN filing for non-US residents • Company name check • Operating Agreement • Domain + business email setup Fluent in English + 中文. Non-resident? A passport is all you need. Message me for a free consultation before ordering.

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