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For example: they say bad things about you or make you mess up on a project so their's looks better. Almost like a bully, but not quite.

  • They're sabotaging you. They're a sabotage. – Dan Bron Jun 16 '16 at 11:14
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Someone who says bad things about you could be a "backbiter" or a "backstabber"

Someone who makes you mess up could be a "saboteur".

Someone who does unethical things to promote their career could be a "neck-stepper".

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saboteur:

"a person who destroys or damages something deliberately : a person who performs sabotage"

http://www.merriam-webster.com/dictionary/saboteur

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