18:28
2026-08-31
dev.to
developer-tools
Beyond Heavy API Keys: How I Built a Zero-Cost Asynchronous AI Summarizer in Spring Boot 3.4
A developer built EchoEngine, a Spring Boot 3.4 application that summarizes YouTube videos using Google's Gemini 2.5 Flash model without API keys for metadata extraction. The app leverages Java 21 vir…