There is a lot of information out there on how to turn your summer internship into a full time offer, but in this post I would like to share with you the 7 things you can do to mess up your chances of getting a full-time offer.Be A Smart-a$$/Arrogant/Have an EgoIn my opinion this is the single worst thing you can do as intern. If you walk into a bank as an intern and you think you know it all or think you are so smart, because you are top of your class at school, you won’t get hired. If you have a bit of an ego because you have already interned at a top tier bank or for any other reason, make sure to drop it. As an intern you have to be humble, hungry and very engaged.Don’t get me wrong. There will be instances where you meet people and think ‘I am 10 times better than this guy’ but never show that you feel that way.Show Up LateThis is a really bad way to stand out. If you are late once it won’t affect your chances of getting hired, but if you come late more than once, you are already in trouble. Punctuality is important and coming late will make it seem like you don’t really care about being there.Make sure you are one of the first on the desk each morning and one of the last to leave. As an intern, that is expected of you.Mess Up The Coffee/Lunch OrderWhen you are asked to fetch coffee, breakfast or lunch make sure you don’t under any circumstances mess it up. The saying on the trading floor goes if he can’t handle a lunch order how will he handle a real order?Write down what you have been told, double check what the other person wants and just don’t mess it up. I remember when I interned I wrote down every team member’s coffee of choice to make sure I could “execute the coffee order” without needing to write it down or mess it up. I suggest you to do the same.Ask Questions Only To Make Yourself Sound SmartThis one I have encountered myself when I had summer interns sit with me. When an intern asks a question that they think make them sound smart, but don’t really care about the answer, it is going to piss the person off who you are asking this to as this is wasting their time. Ask as many questions as you can when you are doing your summer internships but make sure that they are genuine questions , that you want to know the answer to.Not Become Part of The GangThe most important factor when it comes to the hiring decision is whether your desk likes you or not. You don’t necessarily need to be the most educated or sharpest intern to get hired on your dream desk. If the team likes you, you demonstrate that you are keen and you complete the assigned tasks on schedule you should be getting hired.However, if you don’t manage to become "part of the gang" then you are in trouble. What I mean by this is to be on the same wavelength with other team members in terms of humor, conversational topics, attitude, etc.Be Unfair to Your Fellow Interns

It is important that you get along with the other interns. You are competitors in some respect, but don’t get too competitive to the extent where other interns start to talk badly about you (with reason). The graduate recruitment team or even the desk might hear about it and it will reflect badly on you. On a general note, always treat people well and with respect. The industry is small and you don’t want to make yourself any unnecessary enemies. This could hurt you further down the line in your career.

Be Unfriendly With HRIt’s important that you are friendly with HR. The graduate recruitment team has a say in your hire so make sure that you are on good terms with all the HR people involved in the internship program.If you avoid all the above, you are on a good track to getting a full time offer after completing your internship.