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openapi-generator
OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
For most CLIs, Kotlin with https://ajalt.github.io/clikt/. Would consider Go if it's a small project where portability is important, but 90% still Kotlin
For backend, Quarkus with Kotlin, using Kotlinx serialization plugins. Usually REST, sometimes graphql or grpc. OpenAPI specs for the endpoints are generated with quarkus, then https://github.com/OpenAPITools/openapi-generator generates clients for them.