Nicolás Vegas's personal blog — software engineer with a DevOps mindset. I write about software development and build things.https://nicovegasr.com/https://nicovegasr.com/en/blog/building-a-high-availability-api-with-spring-and-rabbitmq/https://nicovegasr.com/en/blog/building-a-high-availability-api-with-spring-and-rabbitmq/How a Spring Boot API handles over 7 million requests a day without scaling vertically or horizontally: asynchronous event processing and batching with RabbitMQ to collapse database connections, validated with a K6 load test.Wed, 10 Dec 2025 00:00:00 GMThttps://nicovegasr.com/en/blog/spring-batch-practical-advice/https://nicovegasr.com/en/blog/spring-batch-practical-advice/Performance and scaling in Spring Batch: parallel flows, step partitioning, and the memory and database considerations —heap, connection pools, ORM vs native SQL— that keep big data jobs fast and stable.Fri, 06 Jun 2025 00:00:00 GMThttps://nicovegasr.com/en/blog/spring-batch-introduction/https://nicovegasr.com/en/blog/spring-batch-introduction/An introduction to Spring Batch: jobs, chunk-oriented and tasklet steps, readers, processors and writers, fault tolerance, and how listeners and metadata tables make batch processing observable.Wed, 28 May 2025 00:00:00 GMThttps://nicovegasr.com/en/blog/gradle-speed-modularity-and-control/https://nicovegasr.com/en/blog/gradle-speed-modularity-and-control/How Gradle works under the hood —directories, core concepts, the build lifecycle, key files and properties— and how to use it to enforce a hexagonal architecture across modules.Wed, 21 May 2025 00:00:00 GMThttps://nicovegasr.com/en/blog/java-jvm-jdk-jre-and-memory/https://nicovegasr.com/en/blog/java-jvm-jdk-jre-and-memory/Understanding how Java works under the hood —JDK, JRE, JVM, JIT, memory and the Garbage Collector— to make better design decisions, optimize performance and reduce infrastructure costs.Thu, 15 May 2025 00:00:00 GMThttps://nicovegasr.com/en/blog/notes-app-asynchronous-communication-with-kafka/https://nicovegasr.com/en/blog/notes-app-asynchronous-communication-with-kafka/How to integrate Apache Kafka into a Spring project to communicate microservices asynchronously and solve the cascading deletion of a user and their notes across two databases.Thu, 03 Oct 2024 00:00:00 GMThttps://nicovegasr.com/en/blog/notes-app-cqrs-separating-reads-and-writes/https://nicovegasr.com/en/blog/notes-app-cqrs-separating-reads-and-writes/How the CQRS pattern separates read and write operations to scale an application horizontally, starting from a real database connection-exhaustion problem.Sun, 29 Sep 2024 00:00:00 GMThttps://nicovegasr.com/en/blog/notes-app-data-modeling-in-mongodb/https://nicovegasr.com/en/blog/notes-app-data-modeling-in-mongodb/Normalize or denormalize: how data modeling changes when you move from a SQL mindset to a NoSQL one in MongoDB, with the real example of folders and notes from the notes app.Mon, 19 Aug 2024 00:00:00 GMThttps://nicovegasr.com/en/blog/notes-app-frontend-architecture/https://nicovegasr.com/en/blog/notes-app-frontend-architecture/Thoughts on how to structure a React frontend project: decoupling HTTP calls, wrapping react-query in your own hooks, and applying the repository pattern on the client.Sun, 09 Jun 2024 00:00:00 GMThttps://nicovegasr.com/en/blog/notes-app-ddd-and-hexagonal-in-spring/https://nicovegasr.com/en/blog/notes-app-ddd-and-hexagonal-in-spring/How to combine Spring's conveniences with Domain-Driven Design and hexagonal architecture: value objects, an exception hierarchy, and mapping between entities and domain models.Mon, 13 May 2024 00:00:00 GMT