LeadsMind Developer Needed (Next.js + Supabase) – $15/hr

LeadsMind is a South African SaaS platform for small and medium businesses. We're looking for an experienced developer to implement a prepared development roadmap covering backend improvements and frontend redesign. Key Tasks Fix backend security issues, authentication, tenant isolation, database performance, API protection, migrations, and testing. Refactor architecture using repository patterns and improve query performance. Build a new frontend design system with Tailwind CSS + Radix UI (removing MUI). Redesign all product modules with a clean, user-friendly experience for South African businesses. Tech Stack Next.js 14 (App Router) TypeScript Supabase (PostgreSQL) Tailwind CSS + Radix UI Redux Toolkit Stripe & PayFast Vercel Requirements Strong experience with Next.js, TypeScript, and Supabase Multi-tenant SaaS experience PostgreSQL functions and database optimization Security best practices (authentication, IDOR, OWASP) Experience with Vitest/Playwright testing To Apply Please answer: What does FOR UPDATE SKIP LOCKED do in PostgreSQL? What is an IDOR vulnerability and how do you prevent it? Describe your experience with multi-tenant SaaS applications. Also include your Upwork profile, GitHub/portfolio, and availability. Rate: $15/hour Duration: 8 weeks Start: Immediate