Architectural Drawing Modification

I need an experienced architect to add a new room and staircase to an existing architectural drawing. The new additions should be in a modern design style.

Requirements:
- Additions: New room and staircase
- Style: Modern design
- Detail Level: Detailed layout with dimensions

Ideal Skills and Experience:
- Proficiency in architectural design software (e.g., AutoCAD, Revit)
- Strong understanding of modern architectural styles
- Experience in creating detailed architectural layouts with accurate dimensions

Please provide samples of previous work and a timeline for completion.