Building a Price Aggregator in Java (Spring Boot, Redis, Resilience4j) — would love some feedback I’ve been building a small project to understand how real backend systems evolve—from simple code to something closer to production. Use case: A Price Aggregator that calls multiple vendor services (Amazon/Flipkart/Walmart mock APIs) and returns the best price. What I’ve implemented so far: • Sequential vs async calls using CompletableFuture (measured latency differences) • Spring Boot microservice with WebClient (non-blocking calls) • Async processing using thread pools • Caffeine cache → later replaced with Redis (for distributed caching) • Docker + docker-compose setup • Circuit Breaker using Resilience4j (to handle vendor failures) Repo: [https://github.com/codefarm0/price-aggregator](https://github.com/codefarm0/price-aggregator) Playlist (if you want context):…