Hi there,

Congratulations on your offer! Regarding your questions:

1- Does accepting the company’s A offer and leaving during the notice period (1 month) will harm my reputation in consulting?

No, but you will burn bridges with company A. If possible, try to delay the start with A after you finished interviews with B and C

2- If I land an offer from company B or Company C and I sign the contract, should I inform B or C that I started with company A?

No need unless they ask explicitly

3- In the worst case, what if my first project within company A would be with client X, and then if I move to B or C, I will have to deal with the same client X. How should I behave?

Extremely unlikely and if it happens won’t happen immediately. In any case, as for 1, better if you anticipate interviews with B and C before you start with A

4- Am I obliged to put that 1/2 months experience with company A in my resume and my linkedin?

No, that’s up to you (I would personally not put it)

Best,

Francesco

Feel free to contact me, then we can have a call on this topic :)