I'm looking for recommendations for the same question, but for someone who did graduate Engineering and Econ, and does a lot of coding.

There's a lot of mathematical fundamentals they don't teach you while you're learning a whole variety of applied math.

Off the top the pieces we did:

- Linear Algebra

- Computation (big-O etc)

- Vector calculus

- Finite Element methods

- SDEs, PDEs

- Discrete math (graphs, cryptography, number theory, etc)

- Complex analysis (used a lot in EE)