If you don’t see senior level people working at the company, first of all, that usually means the company is lacking of the opportunity to promote in terms of job position and salary, and because senior level people possess certain skills and experiences, they can make move quicker and easier, after they departed, junior level people become the people who work at the company the longest and enjoy the seniority. Employers will give these junior people more authority and responsibilities because these junior people are considered loyal, and if you have inexperienced junior level people take in charge and boss around the new coming senior level people, the work environment can be chaotic. Some junior level people even abuse their authority and seniority to take advantage of circumstance and turn themselves into underground bosses. They can do whatever they want because they can get rid of anyone they don’t like including more senior level people who were hired to be in charge. Employers normally listen to these junior level people’s words since they work at the companies the longest so they were considered loyal and trustworthy. As a new employee in this kind of company, no matter you are a junior, intermediate or senior level person, you definitely will have hard time at work no matter what you do unless you become the best friend with the junior level person who works there the longest. On the end, the only people who can thrive at these companies are those who know how to play mind game and politics, not those who are capable or working hard.
I believe everyone had experiences working with people who were fast paced workers. Typically these people are very career and goal oriented, they want to get one stuff done and out of their ways quickly so that they can move onto the next. They are always seen as productive workers, but I personally found people like this normally take actions before they think things through. So, the decisions they made usually were problematic, and often needed other people to spend extra time to reverse or fix. Unfortunately, people like this are always praised as productive, proactive and quick thinkers, and always got the promotion at work to be the decision makers, and I don’t think it will do anything good for any company or organization. So, if you ever hear someone was praised as quick thinker or some companies have fast paced work environment, you might not want to take it too positively.