Have you used public clouds? If yes, which providers and services?

Yes, I have worked with several public cloud providers, including AWS, Google Cloud Platform, and Microsoft Azure. In AWS, I used EC2 services for virtual machines, S3 for data storage, and Lambda for serverless computing. In GCP, I utilized BigQuery for analytics and Cloud Functions for event-driven tasks. In Azure, I worked with App Services and Cosmos DB for scalable applications and databases.