Some of the projects (mostly ruby gems) I have worked on are available publicly. These were largely inspired by problems I saw at work, that also seemed like more broadly applicable to other situations. So I ended up generalizing solutions to these problems where possible.
This is a ruby library that makes it easier to build workflow management systems as a Directed Acyclic Graph. It provides a declarative format to define the dependencies between two actions in a workflow. For instance, in a delivery management system, the actions can be shopping and delivery of goods, and the dependencies between these actions is that shopping must be completed before delivery is attempted.
Kafka-retryable builds application level handling of failures during consumption of Kafka messages. It allows specifying handlers when a Kafka consumer errors during message consumption. Failed messages are enqueued in a dead-letter queue, which can be configured as a topic in Kafka.
This is built for the use-case where any changes to data persisted via ActiveRecord needs to be published as messages to Kafka. This is useful in building asynchronous, event-driven systems where updates to database objects trigger downstream consumers.
Dedup-builds is a script that calls Travis CI and Drone APIs to cancel duplicate builds, except the build for the latest commit, for a particular pull request.
Fun fact: This was written when cancelling builds was not natively supported by these platforms. I think by now both Travis and Drone have settings that allow you to enable cancelling duplicate builds.