Shooter Level Blockout & Pacing

I’m building a modern-setting tactical shooter and I want each mission to feel tight, readable, and constantly engaging before any art pass begins. To get there, I need a seasoned level designer to run a full greybox pass on a small set of maps (currently four, with room to grow)... (Budget: $250 - $750 USD, Jobs: Animation, Game Design, Graphic Design, Illustration, Illustrator, Level Design, Unity, Unreal Engine)