Design a Vibrant, Responsive Landing Page

I'm looking for a UI Designer to create a colorful and vibrant landing page for our app. The main goal of this page is to motivate users to download the app, so it will need to be engaging and user-friendly.

Key requirements include:
- Designing a modern, responsive landing page with a colorful and vibrant theme
- Incorporating app screenshots to give potential users a glimpse of what to expect
- Strategically placing call-to-action buttons to encourage downloads

Ideal skills and experience for this project include:
- Proficiency in web design and development, particularly with creating responsive landing pages
- Strong understanding of UX/UI principles
- Experience with designing engaging, colorful and vibrant web pages
- Ability to incorporate app screenshots into the design in an appealing way
- Proven track record of creating effective call-to-action prompts on web pages

Please share your portfolio with examples of similar projects you've worked on.