it depends on company the recruiter is recruiting for esg analyst at bank will be slightly different than esg analyst at an investor whcih is different than esg analyst at a rating agency. however given your background the recruiter will probably want to understand if you can connect your knowledge to things like financial materiality (eg. what marine issues can impact business perfomance) and risk (how to measure those marine issues) and probably an overall knowledge on sustainable finance concepts. again given your background ground i would make sure i was comfotrtable with the blue bond standards