I have submitted an application for an an operations analytics position on a company's own website. They use a third party software enabling the applicant to track their process throughout the hiring / review process. Nothing changed for about a week and half after I submitted my application. The status was they had received my resume and cover letter and were in the process of reviewing them. I decided to write them a message using this software to reiterate my interest and strong qualifications for the position.
Now does writing back after a week and half seem appropriate? On one hand, I want to maintain my interest in the position and demonstrate why I am a solid candidate, however I also don't to seem annoying or desperate, as to make a negative impression on the manager's mind. I would like to hear some insight from someone more experienced.