STEP File Coloring App -- 2

I need a Python application to color faces of STEP files. The app should support both .stp and .step formats.

Key Requirements:
- Orient solid body based on given criteria
- Color faces of STEP files based on given criteria
- Support both .stp and .step input formats.
- Face selection by specifying properties.
- Source code for tweaking.
- Full working environment with build files.
- Simplistic GUI
- Output files should the same name + "_colored" at the end of the filename

Ideal Skills:
- Good communication skills
- Proficiency in Python.
- Experience with STEP file manipulation.
- Knowledge of geometry and face properties.
- GUI development skills (basic: select file or directory to batch files).
- Dedicated to achieving expected results for quoted fee.