Building a Multi-Provider AI Resume Analyzer in Spring Boot (and why I didn't lock it to one AI provider)

I've been building AI-powered developer tools solo for the past few months, and I want to share some of the architecture decisions behind my latest one: ResumeIQ AI, a resume analyzer and interview prep tool. The core problem I wanted to solve Most AI resume tools are SaaS products tied to one AI provider, usually OpenAI. That means: You're locked into their pricing If you're privacy-conscious, your resume data goes through a service you don't control You can't swap providers if a cheaper or