Hiring an Identity & Access Governance (IAG) developer is crucial for businesses to manage digital identities and control access to sensitive data. They play a pivotal role in designing and implementing IAG solutions that ensure only authorized individuals have access to resources, thus reducing the risk of data breaches. They also help in regulatory compliance by creating audit reports and managing user's roles and permissions. Their expertise enhances security, improves operational efficiency, and protects the business from potential cyber threats.