Customizable PowerPoint Template Creation

I need a PowerPoint template based on my existing presentation. It should also reduce the file size of the current file. This template should be designed for ease of customization, allowing for simple modifications to text boxes and fonts, color schemes, and layout/design elements. The template should also incorporate specific branding elements, including my company's logos, taglines, and company colors.

Ideal freelancers for this project should possess:

- Advanced PowerPoint skills
- Experience with creating customizable templates
- Strong understanding of design principles
- Ability to incorporate branding elements consistently