Looking for Full-Stack Developer (US/Canada/Europe) for Long-Term Collaboration

I am looking for a skilled and reliable full-stack developer to collaborate on an ongoing web-based project. This is not a one-off task — I’m seeking someone interested in long-term collaboration, ideally working closely as a technical partner as the product grows... (Budget: $250 - $750 USD, Jobs: API Integration, Backend Development, Frontend Development, Full Stack Development, HTML, MySQL, Node.js, PHP, Web Development, Website Design)