As a relationship manager, your job is to create and nurture relationships with clients and other stakeholders. To do this you must understand the products your company offers and how they align with your client's needs. You also need very strong communication and interpersonal skills and must always be ready to share information or solve problems for your clients. You may also be tasked with strengthening relationships internally so you must have a strong understanding of the structure of the company, its ethos, and its HR regulations.
Your resume should show a wealth of experience in customer-facing positions and a positive track record of nurturing client relationships and internal relationships. Here is a recruiter-approved resume sample.