就算 (jiùsuàn) is an informal way of saying "even if," and is used to introduce a hypothetical statement. However, unlike 即使 , 哪怕 and 就是, 就算 has more of a feeling that the speaker doesn't believe that the hypothetical statement is reasonable or has much chance of being realized.

就算你给我一百万，我也不能帮你做违法的事情。I can't help you to do illegal things even if you gave me one million dollars.
就算你顺利通过了面试，也不一定能被录用。Even if you pass the interview successfully, we can't say you are definitely going to be hired.
就算你说的都是真的，我们也没办法证明。Even if what you say is true, we still don't have any way to prove it.
就算员工会抱怨，公司也要实行这个新政策。Even if the staff would complaint about it, the company are still going to carry out the new policy.
就算你的汉语水平达到了高级，也还是会有发音问题。Even if your Chinese reached a very high level, you would still have trouble with pronunciation.

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Sources & further reading