Key account managers handle major clients by understanding business requirements, coordinating customised solutions, ensuring service quality, and maintaining strong partnerships. They develop account plans, negotiate contracts, manage escalations, and collaborate across product, marketing, operations, and support teams. Their responsibilities include forecasting account revenue, identifying upselling opportunities, and enabling customer success. The role requires strong communication, strategic thinking, and problem-solving skills. As organisations increasingly prioritise enterprise clients and retention-focused strategies, key account management has become central to sustainable business growth.