Post-interview follow up is a must. You should know that you need to send a thank you email after an interview, but after that things become less clear. Momentum is an important element to the interview process, and effective follow up can drive next steps and help move you through to an offer. Just as important as when you follow up, is what you say.
You can’t simply bug the hiring manager for another interview or send a “just checking in” message. You need to make sure you include something that adds something to the conversation. One way to do this is to discuss any additional research or homework you’ve done that’s relevant to the role. If there is any recent news about the company, mentioning takeaways from the article could be another effective approach. The point is to show you are engaged, excited about the role, and actively working to learn more about the company/industry to make yourself a stronger candidate.