The marketing site already has a ledger look: paper, ink, a seal color, serif headlines. You will extend it for feature pages and simple diagrams of multi-company consolidation. Remote contract. Do not introduce a second palette.
What you'll do
Design assets inside the current brand
Draw diagrams a bookkeeper can follow
Hand off sizes and type a developer can match
Check contrast on the paper background
What we're looking for
Brand or marketing design for a product with a defined system