Generally, the only time you'll hear "work smart" is when it's in the phrase "work smart, not hard". This just means you should find clever ways to perform your work more easily, instead of expending a lot of effort doing things inefficiently.
If you want to say that someone "works smart", you would generally get a bit more specific and say something like:
- "they're a creative problem solver"
- "they're a good problem solver"