I recommend using 'they/them/their' in place of (s)he or 'he/she' as it flows better for the reader. For example... see how the candidate reacts towards a problem and how they try to solve it.

Thanks for the tip and the explanation!

The reason that people now prefer "they" instead of "he" is that it causes a bias towards a gender when discussing things. If you're talking about something that has typically been male-dominated, it's kind of unfair to use "he" when talking about unknown people. So people prefer the use of "they" now, even though it's supposed to be plural. English just doesn't have a neutral pronoun otherwise.

Your English appears better than most native English writers, so while the tip given is valid, you should feel confident in your skills. Even re-reading for tell-tale signs, I’d have not guessed you weren’t a native speaker if you hadn’t mentioned it.