What integration pattern should an Architect suggest for validating street addresses quickly?

The appropriate integration pattern for quickly validating street addresses is best captured by using an Outbound Message with a Callback. This pattern efficiently addresses the need for real-time validation without introducing significant delays.

Using an Outbound Message allows Salesforce to send a message to an external service when a specific event occurs, like when an address record is created or updated. Once the external service validates the address, it can send a response back to Salesforce, often through a callback, which keeps Salesforce updated with the validation results seamlessly. This is ideal for scenarios that require immediate feedback on data integrity, such as address validation, as it allows the address validation process to be offloaded to a specialized service designed to handle such requests efficiently.

In contrast, Remote Invocation initiated by Middleware could introduce complex dependencies and latency since it relies heavily on middleware systems to manage the communication, which may not ensure as quick of a response as desired. @Future methods are asynchronous and suitable for longer processing tasks, which would not meet the quick validation requirement, as they typically operate with a delay. Finally, using a nightly batch process to validate records from the previous day would not be ideal for immediate data validation needs, as it means waiting until the end of the day to validate any addresses that need immediate attention.