If you have a “top list” that’s expensive to compute, a materialized view is a clean approach. Refresh concurrently on a schedule to keep reads fast without blocking.

For pages with expensive secondary data (audit trail, related entities), keep initial render fast and lazy-load a details frame only when the user asks. This is a clean performance pattern for admin pages.

Performance work is hard when you’re guessing what’s in your bundle. The bundle analyzer turns it into a visual diff: you can see which dependencies are big and whether code splitting is working. I gate it behind an env var like ANALYZE=true so it’s o

Controllers shouldn't know about JSON structure—that's a serialization concern. ActiveModel::Serializers (AMS) separates presentation from business logic by defining dedicated serializer classes for each model. Serializers specify exactly which attrib

Overriding the save() method allows custom behavior before or after saving. I call super().save() to preserve default behavior. Common use cases include auto-generating slugs, updating related objects, or validating business rules. I use created check

Retries can become infinite noise. For certain failure classes, record the payload + error in a DLQ table and alert/triage. This keeps queues healthy and makes failures actionable.

Compression can dramatically reduce payload sizes for JSON and HTML, but it also costs CPU. I enable it with sane defaults and avoid compressing already-compressed content (like images). Compression can also hurt streaming responses and SSE, so I disa

When rendering JSON, the serializer layer can silently trigger extra queries. Force “preload then serialize” so your JSON rendering path is deterministic. This pattern scales well in Rails APIs.

Apache Kafka provides distributed messaging for event-driven architectures. Spring Kafka simplifies producer and consumer implementations. KafkaTemplate sends messages to topics. @KafkaListener consumes messages asynchronously. I configure serializers

App Widgets display app content on the home screen. I extend AppWidgetProvider, a BroadcastReceiver subclass handling widget lifecycle. onUpdate() refreshes widget UI, onEnabled() initializes on first widget added, onDisabled() cleans up when last rem

Event listeners attach handlers to DOM elements using addEventListener(). I specify event type like click, input, submit with handler function. The event object contains information about the triggered event. Using event.preventDefault() stops default

Sometimes raw SQL is the cleanest approach—just keep it safe. Use exec_query with bind params instead of interpolating values. You get both safety and correctness with types.