The back office is the portion of a company made up of administration and support personnel, who are not client-facing. Back-office functions include settlements, clearances, record maintenance, regulatory compliance, accounting, and IT services
If your priority is good work-life balance, then a back-office job might suit you better, with its regular timings that close at 6 or 7 pm. You may even be able to work from home as many companies are trying to make their back office work remotely to save on office rental expenses.