A Google Cloud Platform developer designs, develops, and manages applications on Google's highly scalable and reliable infrastructure. They leverage Google Cloud services like computing, data storage, machine learning, and data analytics, to build, deploy, and scale applications, websites, and services on the same infrastructure as Google. They also manage security protocols, data flows, and troubleshoot issues. Their work involves coding, often in languages like Python, Java, or Go. They must understand cloud architecture and Google Cloud's technology stack, including familiarity with tools like Kubernetes and TensorFlow, to optimize the performance and cost-effectiveness of cloud-based solutions.