Yes, but at a higher level and less formally than UML.
A sequence diagram doesn't need to be ordered in a time sequence like UML, it can be good enough to just articulate and number the flow of information on a normal solution diagram.
A class diagram assumes we're using an OO language - we need to define schemas for data, but not classes. The engineering team knows how to structure their code, as an architect all we need to worry about are the boundaries.
A sequence diagram doesn't need to be ordered in a time sequence like UML, it can be good enough to just articulate and number the flow of information on a normal solution diagram.
A class diagram assumes we're using an OO language - we need to define schemas for data, but not classes. The engineering team knows how to structure their code, as an architect all we need to worry about are the boundaries.