Hi sir\Mam,
Hope you are doing well.
I have gone through your job post for front-end web development and I'm very interested in the project.
Having worked on similar projects to what you are looking for, and I'm confident that I can exceed your expectations.
Your project will be delivered on time and within your budget, achieving the results that you are asking for.
I have read through the job details extremely carefully and I'm absolutely sure that with my experience of over 10 years in this field I can do the project very well with fully responsive coding.