Looking for experienced full-stack developer

Our AI-driven reputation-management SaaS is already in production, but the current codebase needs an experienced full-stack eye. The first priority is clear: make the platform faster and more reliable by tackling the server, database, and API layer before fine-tuning anything else... (Budget: $15 - $20 USD, Jobs: API Development, MongoDB, Next.js, Node.js, NoSQL Couch & Mongo, Typescript)