App UI Responsiveness Enhancement

I'm looking for an experienced developer to improve the performance of my existing app, specifically focusing on enhancing user interface responsiveness.

Key areas to address:
- Improve form submission responsiveness
- Reduce slow loading times after submission

Ideal skills and experience:
- Experience with performance tuning for web/mobile applications
- Ability to analyze and resolve bottlenecks in data processing
- Proficiency in front-end development technologies

Please provide examples of similar work done and a brief strategy on how you would approach this task.