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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.
Complete this project. The most important part of this project is understanding why you're using the tools that are mentioned (eg. why is he recommending Github Actions instead of Jenkins). This project got me the job offer that I ended up accepting - I spent almost 2 hours in an interview discussing this and the choices I made while completing it. The one thing that this project is missing is containerization. I'd setup your app to run in a docker container from the very start.
This is a good optional project. Kubernetes is really hot right now and is somewhat of a rare skill. Mentioning it on your resume will probably get you past most HR software.