Full-Stack Engineer (Next.js + Supabase + Stripe + OpenAI) $$ Offline

We are looking for an experienced developer to build a minimal, modular MVP SaaS based on the following stack: Next.js (App Router), Supabase, Stripe, OpenAI API.

This phase represents the technical foundation only, without revealing business logic and without any complex functionality.
The main criteria are: simplicity, clean code, modularity, and the ability to extend the system later without refactoring.

Scope of Work (MVP)

User Side

• Supabase authentication: registration / login / password reset
• Basic user dashboard: active plan + simple usage statistics
• One Workspace page
• AI Chat module:
  • prompt → response
  • minimal conversation history

Billing

• Stripe integration
• 3 fixed monthly plans
• Basic webhooks (activation / cancellation / plan update)

Admin Panel

• Simple admin view: list of users + their usage

Architecture / Project Structure

• Clean modular structure (each module in its own folder)
• Mini documentation: one README per module
• KISS approach: no unnecessary architectural complexity

Critical Requirements

• Business logic and product idea will not be disclosed at this stage — only the technical skeleton is required.
• The stack is strictly fixed: Next.js + Supabase + Stripe + OpenAI API.
  Please do not propose NestJS, Laravel, microservices, DDD, Redux, GraphQL, etc.
• No calls are required — the full scope is described in detail.
• Proposals without a fixed price will not be considered.
• If a feature is not listed, it is not part of the MVP.
• The scope is fixed and does not expand.
• No UI/UX design, no Figma, no complex interfaces — simple minimalistic layout is sufficient.

Target Audience

At this stage, this is an internal technical foundation, not a public-facing product.

Success Criteria

• Clean, logical, and easy-to-read code
• Transparent modular structure
• No complicated abstractions
• Fully functional chain:
  Auth → Dashboard → Workspace → AI Chat → Stripe → Admin
• Code must be understandable to a junior developer
• Ready for further extensions without rewriting

Important Notes

To ensure a clear and comfortable process for both sides:

• Only fixed-price offers for the stated scope.
• We rely on market rates for this type of work;
  excessively inflated proposals may remain unanswered.
• All communication through the platform’s chat.
• No additional business logic will be provided at this stage.
• If a feature is not listed — it is not included in the MVP.
• The scope is fixed and will not expand.

Thank you for your understanding.