Universal Hiring uses Salesforce to capture job applications. A salesforce administrator created two custom objects; Job__c acting as the maste object, Job _Application__c acting as the detail…

A roll-up summary field cannot perform complex comparisons between values from different related objects or handle multi-select picklist logic; it only aggregates summary data from child records.

While an Apex trigger could accomplish this, a record-triggered flow is the recommended declarative alternative when possible, as it requires less maintenance and no code.

A formula field can display real-time comparisons, but it cannot access grandchild relationships directly in this complex way, especially involving multi-select picklists, and it cannot *write* or 'keep in sync' a stored value on the record.

A record-triggered flow can be configured to execute when a Contact's Mailing State changes. It can then traverse the master-detail relationships to find related Job_Application__c records, compare the Contact's Mailing State against the Job__c's multi-select picklist, and update a field on the Job_Application__c record to reflect the match, ensuring real-time synchronization.