Senior Full-Stack SaaS Engineer Required

Cliente Freelancer · Remoto · Remoto · freelance · mid · 250–750 USD

Publicada el 2026-07-28

Descripción de la oferta

Senior Full-Stack SaaS Engineer (Lovable, React, Supabase, AI, Stripe & Brevo) I am looking for an experienced Senior Full-Stack SaaS Engineer to complete an existing enterprise SaaS platform. This is NOT a new project. The platform is already under development and includes an existing Phase 1 build, a Lovable-generated React frontend, an existing React/TypeScript codebase, product documentation, a README, defined architecture, and completed UI/UX. I am not looking for someone to rebuild the application from scratch. I need a developer who can understand the existing codebase, continue development, and deliver a production-ready platform. This is a fixed-price project. I am not looking for hourly work or multiple discovery phases. The platform is a multi-tenant enterprise SaaS application that includes organization management, employee management, client management, secure authentication, role-based access control (RBAC), AI-powered document analysis, workflow automation, secure document storage, PDF and letter generation, billing and subscriptions, email automation, reporting, audit logs, and administrative dashboards. The project already uses or will integrate the following technologies: * Lovable * React * TypeScript * Supabase * PostgreSQL * Supabase Authentication * Supabase Storage * Supabase Row Level Security (RLS) * Stripe * Brevo * OpenAI and/or Anthropic * REST APIs * GitHub Experience with enterprise SaaS architecture is strongly preferred. The selected developer will be responsible for reviewing the existing codebase and documentation, continuing development from the current Phase 1 build, integrating the existing Lovable frontend with the backend, completing the Supabase implementation, building the remaining APIs and business logic, implementing secure authentication, implementing multi-tenant architecture with Row Level Security (RLS), completing organization, employee, and client management, integrating Stripe subscriptions and billing, integrating Brevo for transactional emails, onboarding, password resets, invitations, and workflow automation, implementing AI-powered features, completing secure document uploads, storage, PDF and letter generation, testing and optimizing the application, fixing bugs, and preparing the platform for production deployment with clean, secure, maintainable source code. I am looking for someone who has real experience building production SaaS applications, not just websites or simple CRUD systems. You should be comfortable taking ownership of an existing codebase, working with a Lovable-generated React application, and completing a scalable enterprise platform without redesigning it. Please include the following with your proposal: * Examples of SaaS platforms you have built. * Your experience with React and TypeScript. * Your experience with Supabase. * Your experience implementing multi-tenant SaaS applications. * Your experience implementing Supabase Row Level Security (RLS). * Your experience with Stripe integrations. * Your experience with Brevo integrations. * Your experience integrating OpenAI and/or Anthropic. * Your GitHub profile or portfolio. * Your estimated timeline to complete the project. The successful candidate will receive access to the existing Phase 1 build, README, technical documentation, product specifications, existing codebase, and architecture documentation after the initial review process. Important: Please do not send a generic proposal. To demonstrate that you have read this job description, begin your proposal by answering the following question: “How would you implement secure tenant isolation using Supabase Row Level Security (RLS) in a multi-tenant SaaS application?”

Skills

Fuente original: freelancer

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