I'm interested in your professional development system.

我对你们的职业发展体系很感兴趣。

We welcome any questions about the job.

我们欢迎与工作相关的任何问题。

I'm interested in your professional development system. Can I have any more details of that?

我对你们的职业发展体系很感兴趣。我可以多了解一些吗?

What’s the biggest challenge I may face?

面临的最大挑战会是什么?

Any more questions?

还有问题吗?

Yes. What’s the biggest challenge I may face?

是的。我面临的最大挑战会是什么?