Always strive for excellence in your work, seeking Allah's pleasure. You will find that not only will you develop a stellar reputation, excel in your field, and move up within your company – the intangible rewards from Allah will be numerous, alhamdulillah.
One of the most hated sins to Allah is the practice of ribaa (usury / interest). Many Muslims (especially in the West) feel as if they cannot live and acquire things that they need (education, housing, etc.) without accepting or paying riba