We were tasked with creating advanced filtering capabilities for use within a stock trading application. Requirements were for complex queries that included AND/OR statements and nesting using a variety of fields for the criteria.
Moderated user testing on our first iteration of the interface releveled that most users didn't need complex filters, they only needed a quick way to filter using 1-3 criteria. 
The redesigned default has simple AND logic with the most common filters as placeholders to get started.
While the interface was built to accommodate the majority of users who need only simple filtering it also allows for more complex filters to be added on easily.
Role: Senior Product Designer
Skills: Interaction Design, Prototyping, Moderated User Testing

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