Jolie features:

• Contract-first: Puts API design first and supports both synchronous and asynchronous communication.
• Data models: Defined by types with refinement (shown in red on the right), and DTO transformations managed by the interpreter.
• Structured workflows: Comes with native primitives like sequences and parallels for structuring code naturally.
• Dynamic error handling: Solid semantics for parallel fault handling with the install primitive to update fault handlers at runtime.

Code examples:

• Interface example: Defines a ProfileInterface with synchronous and asynchronous operations.
• Workflow example: Shows how operations become available in sequence (after login) and in parallel (|).
• Error handling example: Demonstrates a service with nested scopes and fault recovery using install.

Composition examples:

• Orchestration: An orchestrator coordinates other services with a workflow.
• Aggregation: Generalizes proxies and load balancers to compose and expose API of separate services.
• Redirection: Generalizes virtual servers to hide service locations and assign logical names.
• Embedding: Generalizes application servers to run other services as inner components and enables cross-language communication.