Younes M.

Need a SaaS built right, or an AI-built app made safe before real users touch it? I'm a full-stack SaaS developer and Supabase expert for multi-tenant B2B web applications on Next.js, React, Node.js, Supabase and PostgreSQL. 100% Job Success, ex-Oracle Cloud engineer, 6 years of experience and many SaaS products, MVPs and security audits delivered to production. I build production-ready SaaS products and MVPs, add AI agents and RAG features, and audit and secure AI-built and vibe-coded apps (Lovable, Bolt.new, v0, Cursor, Windsurf, Replit, Base44, Claude Code). SERVICES - Multi-tenant SaaS development: each customer sees only their own data. Multi-tenancy architecture, tenant data isolation, organizations and teams, roles and permissions (RBAC), Supabase row level security, per-seat billing and admin dashboards. - Full-stack web app development: one developer for frontend, backend, database and integrations. Next.js, React, TypeScript, JavaScript, Node.js, Express.js, NestJS, backend development, REST API and third-party API integrations, PostgreSQL database design, Prisma and authentication. - SaaS MVP development: get to paying users without wasting runway. From idea to a launched MVP with authentication, Stripe billing, an admin dashboard and deployment. - Supabase security audit, code audit and production readiness: find out who can read data they shouldn't, before your users do. RLS policies, Supabase auth, storage permissions, exposed API keys and a code review report ranked by risk, then the fixes. - AI-built app to production and vibe coding cleanup: keep what works and make the rest safe to launch. Bug fixing and refactoring AI-generated code from Lovable, Bolt.new, v0, Blink, Cursor, Windsurf, Replit, Base44 or Claude Code, performance fixes, finishing features, staging and deployment. - Stripe integration: billing that doesn't double-charge or lose subscriptions. Stripe subscriptions, per-seat billing, Stripe webhooks and the full subscription lifecycle. - AI development: AI features that take real actions and cite their sources. AI agents, AI chatbots, RAG over your own documents, Claude API, OpenAI API, Vercel AI SDK, LangGraph, pgvector, MCP servers, voice AI agents with LiveKit and AI automation with n8n. - Deployment and DevOps: releases you can repeat without breaking production. Vercel deployments, preview and staging environments, CI/CD with GitHub Actions, Docker, AWS, Terraform and Google Cloud Run. - Mobile apps: take your product to iOS and Android. React Native and Expo apps on Supabase or Firebase, RevenueCat in-app subscriptions, web app to iOS app with Capacitor and App Store release. PROOF - Sendocki: Multi-tenant SaaS on Next.js and Supabase. Took over an AI-generated codebase, refactored it and brought it to production, and reworked the multi-tenancy model and Supabase RLS for merchant teams. Serves 150+ businesses and integrates six carriers and five e-commerce platforms. - LeadSysGen: Full-stack SaaS built solo with Next.js, Node.js, TypeScript and PostgreSQL. Meta, Google and TikTok Ads API integrations, AI lead scoring, and an AI agent built on the Claude API and Vercel AI SDK that takes real actions in the app. - HRX Avatar: Multi-tenant attendance SaaS backend on Firebase and Google Cloud Run with role-based access control, organisation and site level permissions, transaction-safe sessions, Stripe per-seat billing and webhooks. - Security Questionnaire Assistant: Multi-tenant RAG SaaS with Next.js, FastAPI and pgvector, tenant data isolation, deployed on AWS with Terraform. - Recruitment Center: AI-assisted recruitment CRM on Next.js, Supabase and LangGraph with document classification, fact extraction and human-approved drafts. - ChaseMate: Pre-launch code review and security review of an AI-built React/Next.js app, covering architecture, data access and launch risks. WHAT CLIENTS SAY "He is thorough, responsive, patient and extremely good at spotting things I hadn't considered. He doesn't just implement something because I've asked for it, he thinks about the wider impact, flags potential issues and suggests better solutions. He has helped me work through everything from functionality and payments to security, privacy, testing and preparing for launch." (5.0 client review) STACK Next.js, React, TypeScript, JavaScript, Node.js, Express.js, NestJS, Redux, Supabase, Supabase Auth, Row Level Security (RLS), PostgreSQL, Prisma, Drizzle, MongoDB, Firebase, Firestore, Clerk, Stripe, RevenueCat, REST APIs, webhooks, Vercel, React Native, Expo, Capacitor, Claude API, OpenAI API, Vercel AI SDK, LangGraph, LangSmith, pgvector, RAG, MCP, LiveKit, WebRTC, n8n, Python, FastAPI, Docker, AWS, Google Cloud Run, Terraform, GitHub Actions, CI/CD, Playwright, Vitest, Claude Code. Message me here on Upwork with your app, your stack and where you're stuck, and I'll reply with the top risks and next steps I see.