Audit & Simplify Full-Stack Platform

I recently inherited a web + mobile platform that lives in GitHub and is deployed through Vercel with Cloudflare in front. Everything runs, but the architecture feels overly complex and the camera/gallery upload feature fails intermittently... (Budget: £10 - £15 GBP, Jobs: Android, API, Cloudflare, Full Stack Development, GitHub, iPhone, Mobile App Development, PHP)