> Using languages like closure do give you a great amount of job security if you manage to sneak it in though.

I am not after job security. In fact, I treat "I am not after job security" as one of the important points when presenting to potential employers.

I try to do good job and think for the outcomes for the employer first.

I value trust and I try to make it clear to my boss that they can trust me to always work with best interest for the project and company.

For example, I always make it clear when I make mistakes and then we try to figure out how to solve them.

I think, overall, this brings much better job security than trying to sneak technology to create a project that only I would be able to maintain.