As a seasoned developer with comprehensive expertise in CakePHP, I strongly believe that I am the most suitable person for this job. My proficiency extends to the specific areas you mentioned- Flash messages, client validation, and email sending. In fact, I notice that the core codes required for these functionalities are already present but are not working efficiently. With my problem-solving abilities and resourcefulness, I would be able to resolve these issues promptly and professionally.
My technical skillset is varied and extensive, which is crucial to navigate complex programming issues. I have a wealth of experience working on various real-world projects including e-commerce, social networking, and healthcare platforms. Apart from being well-versed in PHP programming language like CakePHP, I am also proficient with front-end web development technologies such as HTML5, CSS and Javascript that complement the backend framework perfectly.
Moreover, my interpersonal skills are something I pride myself on greatly; I believe in prompt communication and a collaborative work approach. Opting for me means not just ensuring efficient coding but also a smooth, smoothly coordinated working experience. Let's get this project back on track together!