Senior Full-Stack Engineer Needed - Planning Platform (Next.js + Webflow + OpenAI)

Overview

I’m building an AI-powered wedding planning platform and need a senior-level full-stack engineer to take over integration and evolution of the product.

This is not a simple embed task.

The core AI product already exists in Next.js and is deployed. A Webflow marketing site has also been built. The next stage is to properly integrate the two, refine the architecture, and continue evolving the product into a scalable SaaS platform.

I’m looking for someone who can think beyond implementation and help shape a production-ready system.

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Current Architecture

Application Layer
• Next.js 15 (App Router)
• React 19
• Hosted on Vercel
• OpenAI integration (AI wedding planner)
• Clerk authentication
• Stripe billing
• Supabase / Postgres database

Features Already Built
• AI wedding planner
• Vendor discovery
• Messaging & inquiry system
• Quote collection & negotiation
• Booking confirmation flow
• Checklist management
• User dashboard

Marketing Layer
• Webflow site
• Custom rose-glass design aesthetic
• Landing & pricing pages built
• Needs structured integration with the app

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What I Need

Phase 1 – Architectural Integration

Not just iframe insertion.

We need a proper integration strategy between Webflow and the Next.js app that:
• Preserves performance
• Maintains authentication integrity
• Avoids security policy conflicts (CSP / frame-ancestors)
• Ensures seamless UX
• Supports future feature growth

Options may include:
• Subdomain architecture
• Micro-frontend approach
• Controlled embedding
• Reverse proxying
• Or full migration strategy if appropriate

I’m open to recommendations from someone experienced.

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Phase 2 – Product Refinement & UI Evolution

The Webflow site is not final. Sections will need:
• Rebuilding and restructuring
• AI feature positioning
• Conversion-focused UX improvements
• Interactive elements
• Embedded product experiences
• Ongoing iteration

This is not a static website job — the marketing site must evolve alongside the product.

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Phase 3 – AI Feature Expansion

The AI planner is live but will require:
• Prompt refinement
• Output structuring improvements
• Performance optimisation
• Model evaluation
• Potential feature expansion (budget modelling, vendor scoring, itinerary builder, etc.)

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Technical Requirements

You must have real-world experience with:
• Next.js App Router (production deployment)
• Vercel environment management
• OpenAI API integrations
• Stripe subscription logic
• Postgres / Supabase
• Authentication systems (Clerk or similar)
• Cross-origin security & CSP handling
• SaaS architecture design

Bonus if you have:
• Experience building AI SaaS tools
• Product thinking
• Experience integrating Webflow with custom apps
• Strong UI/UX sensibility

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Not Suitable If
• You primarily build static Webflow sites
• You’ve never deployed an AI-powered production app
• You don’t understand CSP / iframe policies
• You can’t explain tradeoffs between architectural approaches

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Deliverables
• Clean integration between Webflow and application layer
• Production-ready deployment structure
• Security reviewed & hardened
• Refined AI experience
• Documentation of architecture
• Scalable foundation for growth

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Engagement

This is not a one-off task.

I’m looking for a long-term technical partner to help evolve this platform into a serious AI SaaS product.

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Budget

Open to fixed-price or milestone-based proposals.
Please propose based on scope and architecture approach.

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To Apply

Please include:
1. 2–3 AI-powered SaaS products you’ve built or contributed to
2. Your proposed integration architecture approach
3. Your preferred stack refinements (if any)
4. Estimated timeline for Phase 1
5. Whether you’d structure this as project-based or ongoing retainer