Amazon API Gateway is one of the default ways to create HTTP APIs in AWS. In essence, API Gateway implements the web layer of your application as a managed service in AWS, which allows you to focus on business logic rather than infrastructure.
AWS Step Functions is a serverless function orchestrator that uses a state machine to tie together Lambda functions and other supported AWS services to build complex serverless workflows. Step Functions can integrate directly with many AWS services such as Lambda, DynamoDB, SQS, SNS, API Gateway, SageMaker and Athena. A state machine can be deployed, started and monitored through the console or an AWS SDK.
Azure Data Factory is a managed, serverless ETL tool with a drag & drop UI for use in the Azure cloud. It is a good product, but lacking in maturity in some areas - mainly surrounding the UI itself.
Bitrise is a cloud-hosted CI/CD as-a-service platform built for mobile application projects. It is a mature product, and is widely used for mobile engineering projects. It does have some small disadvantages over Circle CI and other build platforms (see below), but the built-in mobile features make it worth consideration.
Circle CI is recommended as the default choice for cloud-hosted CI/CD systems. It is a mature product, but still retains the cleanliness and modernity of design which makes it so easy to use well.
AWS CloudWatch Logs is a managed log aggregation service, and is our default solution for log storage and analysis in AWS. It is integrated with many AWS services, including ECS and Lambda, and often provides the easiest route to collecting logs and making them queryable. As a fully managed service, CloudWatch Logs also typically requires no maintenance once an appropriate retention period is set. It's important to be aware of the importance of setting this retention period as the default is to retain logs indefinitely, meaning log volume (and so monthly cost) increases over time and can become significant.