Hydration

Event-driven architecture (EDA) is a software design pattern where components communicate by producing and consuming events rather than making direct synchronous calls. When something happens — a user signs up, an order is placed — an event is emitted, and any number of subscribers can react independently. This decoupling enables highly scalable, loosely coupled systems where new automations can be added without modifying existing services.

GitHub Actions is a CI/CD and workflow automation platform built directly into GitHub. Developers define workflows in YAML files that trigger on events like pushes, pull requests, or schedules, running jobs on GitHub-hosted or self-hosted runners. Its marketplace offers thousands of reusable actions for tasks like linting, testing, deploying, and publishing packages.

Code splitting is an optimization technique that breaks a JavaScript bundle into smaller chunks that are loaded on demand, rather than forcing users to download the entire application upfront. In React, this is achieved through `React.lazy()` and dynamic `import()` statements, which create separate bundles loaded only when the corresponding component or route is accessed. This dramatically improves initial load times, especially for large single-page applications with many routes.

Orchestration is the automated coordination of multiple services, tasks, or systems to execute a complex workflow. An orchestrator acts as a central controller that manages the sequence, parallelism, error handling, and retries of individual steps. In the context of AI agents, orchestration involves chaining LLM calls, tool use, and decision-making steps; in DevOps, it coordinates container deployment, scaling, and service discovery.

Infrastructure as Code (IaC) is the practice of managing and provisioning servers, networks, and cloud resources through machine-readable configuration files rather than manual processes. It enables version control, code review, and automated testing of infrastructure changes just like application code. Tools like Terraform, Pulumi, and AWS CloudFormation are popular IaC solutions that make environments reproducible and consistent.

Headless UI refers to component libraries that provide behavior, state management, and accessibility logic without any predefined styling or markup. Libraries like Radix Primitives, Headless UI by Tailwind Labs, and React Aria give developers full control over visual presentation while handling complex patterns like focus management, keyboard navigation, and ARIA attributes. This approach decouples functionality from design, making it ideal for custom design systems.