I need a SharePoint site designed specifically for team collaboration among employees. The primary content on this site will be internal news and announcements. Key requirements: - User-friendly interface for easy navigation - Sections dedicated to internal news and announcements - Access controls to ensure information security - Mobile-friendly design Ideal skills: - Proficiency in SharePoint development - Experience in designing collaboration-focused sites - Strong understanding of access control and security features - Good design sense for a clean, professional look Please provide examples of relevant past work.