As a native speaker in Spanish and a fluent English speaker (level C1-C2) I can easily provide my clients with really accurate translations between this two languages. Complexity of terms are not a problem. As I am a Medical Doctor, I'm also familiarized with health related writing and I'm good at it.
If it was audio or real time conversation, I'm good at speaking. I participated on many different speech courses and my oral capacities are at a very good level. I taught English as a foreign language for 4 years during my studies at University, so I can properly manage an understandable conversation.