Why you are not promoted even after working 3 or 4 years. Something you can find from this video.
Useful Golang interview questions you can read at one place. You can refresh quickly before your interviews.
I have given three ideas to improve SQL performance in this post. Quickly you can implement in your project.
Hyperledger fabric is one of the top blockchains. Learning about ecosystem gives you good confidence in your next interview. This post gives you a clear idea about the ecosystem.
Derived Table in DB2 is a solution to avoid complex SQL query. After deriving you use that table whenever you need in that main SQL query.
Linux is popular operating system for all open source developers. These are key points you need to read.
Next step to machine learning is deep learning. It is a part of machine learning.
12 top blockchain frameworks every blockchain developer must read and understand about this up-coming technology.