Full-Stack Developer for Existing SaaS & Mobile Application Troubleshooting and Support

Looking for an experienced full-stack developer to take over and support an existing live SaaS and mobile application. This is not a rebuild project. The core product is already developed and running, and the focus will be on understanding the current system, improving stability, fixing issues, and helping us continue building new features over time. The application is hosted on AWS, with the database managed through MongoDB Atlas. The ideal developer should be comfortable stepping into an existing production codebase, working independently, troubleshooting issues, and making practical improvements without disrupting current users. The work will include reviewing the existing architecture, supporting the backend, admin panel, manager portal, and mobile applications, maintaining AWS and MongoDB integrations, assisting with app releases, improving performance, and implementing smaller feature enhancements. We are looking for a long-term technical partner who can help us maintain and improve the platform as the business grows. Ideal candidate should have experience taking over existing applications built by previous development teams, strong JavaScript/full-stack experience, AWS and MongoDB knowledge, and the ability to communicate clearly about technical decisions, timelines, and recommendations. This project may lead to ongoing development work, including product improvements, feature development, security enhancements, and long-term application support.