Dev Tools · 13h ago
Developer Builds AI Interview Prep App with RAG in 10 Days
A developer created SkillRound, an AI-powered mock interview app for Java/Spring Boot developers, featuring 2,358 questions across 16 topics. The app uses a RAG pipeline with a 152,000-word knowledge base to evaluate answers against real content, not generic AI feedback. Cost per evaluation was reduced by 74% through prompt optimization, dropping from $0.027 to $0.008 per call.
Meridian48 take
A solid technical showcase of RAG applied to a niche use case, but the app's long-term value depends on maintaining the knowledge base and user adoption beyond the developer's own network.
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How I Built an AI Interview Prep App with Spring Boot + RAG in 10 Days →
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