Full-Stack Developer for SaaS Platform

We are looking for an experienced Full-Stack Developer to upgrade our existing SaaS platform and help build Version 2 of the product. The platform is already live, but we need to improve the front-end, update key user flows, rebuild outdated parts, improve performance, and add new functionality based on our updated product requirements. We need someone who can review the current codebase, understand the existing architecture, work with Figma designs, and turn the platform into a more scalable, polished, production-ready SaaS product. Scope of work: Review the existing SaaS platform, codebase, and current architecture Update front-end screens based on new Figma designs Improve dashboards, tables, forms, filters, settings, and user account pages Refactor outdated or unstable parts of the application Improve back-end logic, database structure, and API performance where needed Add new SaaS features for Version 2 based on product requirements Improve authentication, permissions, and role-based access if needed Fix bugs, improve responsiveness, and optimize performance Integrate third-party services such as payments, email, notifications, analytics, or business tools if needed Prepare the updated platform for production deployment Requirements: Strong experience with existing SaaS platforms, web applications, dashboards, or B2B systems Strong skills in React, Next.js, Node.js, TypeScript, and database development Experience working with existing codebases, refactoring, and improving production applications Experience with PostgreSQL, MongoDB, Firebase, Supabase, or similar databases Experience building and improving APIs, authentication, permissions, and admin panels Ability to work from Figma designs and build clean, responsive interfaces Good understanding of scalable architecture, performance optimization, and production deployment Experience with Stripe, email systems, notifications, analytics tools, or SaaS integrations is a plus Please apply with examples of SaaS platforms or web applications you have built, upgraded, or refactored. Include your preferred tech stack, availability, and estimated timeline for reviewing the existing platform and building Version 2.