If AWS is an option for you, take a look at the AWS Serverless ecosystem, particularly Lambda, Eventbridge, and API GW. I have worked with these (and other serv

If AWS is an option for you, take a look at the AWS Serverless ecosystem, particularly Lambda, Eventbridge, and API GW. I have worked with these (and other services) for large projects, and they work great, especially for Node.js based applications. Aurora Serverless V2 looks promising too, but I didn't have a chance to work with it yet, only RDS and DynamoDB.