PRESTIA AI SaaS Platform Full-Stack Developer

​ Required: Senior Full-Stack Next.js Developer – High-Conversion SaaS Platform (PRESTIA AI) ​Project Overview: We are building the core foundation (MVP & SaaS Tier) for PRESTIA AI Platform—a high-converting, scalable B2B AI Automation & Sales Engine targeting the US, Gulf, and global markets. We require a world-class Senior Full-Stack Developer to build a bulletproof, high-converting, and ultra-user-friendly SaaS platform built for self-funding and aggressive scaling. ​Contract Type: All-inclusive Fixed Price – 30 Days – Final Delivery Deployed in Owner’s Accounts ​Core Focus: Extreme Conversion (High-Conversion Funnels) + Maximum Ease of Use (UX/UI) + Production-Grade Payment Architecture ​1. Key Strategic Pillars to Achieve in This Build ​ Pillar 1: High-Conversion Engine (Built to Convert) ​Dedicated High-Converting Landing Pages: Modular landing page architectures matching ad hooks directly to offers (Zero distraction, optimized for instant conversion). ​High-Converting Funnel Mechanics: Multi-step conditional checkout, order bumps, one-click upsells/downsells, and immediate friction-free onboarding. ​Live Social Proof & Demo Widgets: Interactive 60-second video demo placeholders, live interactive preview widgets, and dynamic trust triggers. ​ Pillar 2: High-Value & High-Demand B2B Services (Pre-Configured Offers) ​5 Core High-Ticket & SaaS Pricing Tiers: ​ACQUIRE: AI Lead Capture & Initial Qualification ​CONVERT: AI WhatsApp & Social Media Sales Agent (Fast 30s Response) ​AUTOMATE: Appointment Setting & CRM Workflow Orchestration ​RETAIN: AI Database Reactivation Engine ​REVENUE OS: Full Enterprise Suite (Setup Fee + Monthly Retainer Engine) ​Sales Optimization System: Dynamic support for 30 Add-on Services, 5 Order Bumps, and Conditional Upsell/Downsell Flows (One-Click Billing). ​Multi-Currency & Billing Options: Dynamic USD / SAR / AED / EGP toggle with Monthly/Annual subscription switches (with instant discount badges). ​ Pillar 3: Intuitive Ease of Use & Frictionless UX (Admin & Client Dashboard) ​Self-Serve Onboarding: 3-step setup wizard (Zero technical jargon for end-users). ​Single-Dashboard Control: Intuitive client portal to monitor AI conversations, booked appointments, and lead statuses in real-time. ​No-Code Configuration Panel: Simple form-based prompts where business owners can customize their AI Sales Agent rules without touching any code. ​2. Scope of Work & Technical Architecture ​Pages & Structure: 6 Core Layout Templates serving 10 Main Pages + 18–22 High-Converting Sales Funnel Paths. ​Languages & RTL: English / Arabic + Native True RTL Support + Seamless Responsive UI (Mobile-First). ​Tech Stack (STRICT & NON-NEGOTIABLE): ​Frontend: Next.js 14 App Router + TypeScript + Tailwind CSS ​Backend & DB: Supabase (Auth, Database, RLS Security Policies) ​Payments & Billing: Stripe Elements & Payment Intents + PayPal Vault (Off-session & One-Click Billing) ​Integrations: GoHighLevel (GHL) Webhooks, OpenAI API connectors, Make/n8n webhook endpoints. ​Deployment: Vercel Production Environment ​ STRICTLY FORBIDDEN: WordPress, Elementor, Bootstrap, or Pre-made bloated templates. ​3. Core Developer Responsibilities & Security Standards ​Payment Security & Idempotency: ​Server-side price verification ONLY (Zero front-end price manipulation). ​Webhook processing with idempotency keys to prevent double charging. ​Stripe / PayPal Vault implementation for explicit recurring charges and seamless 1-click upsells. ​Zero credit card data stored locally. ​Database & API Security: ​Strict Row Level Security (RLS) policies on Supabase. ​Secure API Key Vaulting and server-side rate limiting. ​Performance Metrics: ​LCP < 2.5s | INP < 200ms | CLS < 0.1 (Optimized Core Web Vitals for maximum ad conversion). ​4. Terms, Timeline, & Handover Guarantees ​Fixed Price: All-inclusive budget stated upfront (No hidden costs or scope creep fee requests). ​Timeline: 30 Calendar Days (Milestone-based delivery with 3 Loom video progress updates per week). ​Warranty: 180 Days of free post-launch support (Critical bugs resolved within 24 hours). ​Full Ownership Transfer: 100% Codebase, GitHub Repository, Supabase Migrations, Documentation, and Vercel Deployment transferred to Owner's primary accounts. ​Final Acceptance: Handover is approved ONLY after passing 10 documented Acceptance Tests (Pass/Fail with Loom video evidence). ​5. Application Instructions (Incomplete Proposals Will Be Automatically Rejected) ​To apply, you MUST start your proposal strictly using this exact template. Applications omitting this format will be declined immediately: I agree to the full scope, acceptance tests, and 30-day timeline: [Yes/No] Fixed Price Proposal: $___ Timeline: ___ Days 180-Day Post-Launch Warranty: [Agree / Disagree] 3 Live Projects demonstrating Next.js 14 + Payment Webhooks + High-Converting Funnels: 1. [Direct Link] - My Role: ___________ 2. [Direct Link] - My Role: ___________ 3. [Direct Link] - My Role: ___________ Loom Demo / Video Proof of Webhook & Funnel Verification: [Link] Exceptions / Additional Scope Clarifications: [None / Specify if any]