I'd like to suggest my company blog: https://blog.serverdensity.com

As an example, our frontend engineering team just wrote up a series of posts about implementing graphing in React, migrating from Redux:

- https://blog.serverdensity.com/time-series-charts-react-redu...

- https://blog.serverdensity.com/building-a-color-engine-for-g...

- https://blog.serverdensity.com/lessons-learned-implementing-...

And I wrote about recent backend changes to our time series storage: https://blog.serverdensity.com/time-series-data-opentsdb-big...