Web App Script Development

I'm seeking an experienced app script developer to assist in building a web app compatible with both desktop and mobile browsers.

Key Requirements:
- Develop scripts to enhance app functionality
- Ensure cross-platform compatibility and responsiveness
- Collaborate on app architecture

Ideal Skills:
- Proficiency in JavaScript, HTML, and CSS
- Experience with web app frameworks (e.g., React, Angular, Vue)
- Strong background in writing and debugging scripts
- Familiarity with responsive design principles
- Problem-solving and collaboration skills

Please provide relevant experience and samples of previous work.