A business development executive or a business development manager is a sales professional who helps an organisation to grow by identifying and developing new business opportunities. Their duties include searching for new clients, finding new potential services to offer, and helping the company expand to new marketsA business development executive or a business development manager is a sales professional who helps an organisation to grow by identifying and developing new business opportunities. Their duties include searching for new clients, finding new potential services to offer, and helping the company expand to new markets