How come people don't know what work you are doing at the company (thus allowing your colleague to take credit for it)? That's probably what you should try to a

How come people don't know what work you are doing at the company (thus allowing your colleague to take credit for it)? That's probably what you should try to address. I'd start by writing emails detailing such or such feature you are working on, how it improves the system, etc. Maybe ask for feedback, or ask general questions to the business owner. Maybe suggest using some issue tracker where you could document over time what you are doing via comments, issues, etc. I'd expect your colleague might be the kind to distort truth, so such record is a good point of reference to set things straight. Not only that would be good for you, since people will know that you are improving the system, but it will be good for the company since they'll know what's going on. They are lucky you're actually doing your job because another employee could have been slacking off and they wouldn't even know it.