I would think that what the font end is for would be more important that the technology powering it.
I would look for a job in an industry you find intresting rather than a job that uses a tool you know.
Staying in a company for 1.5 years and perfecting a niche technology, while helping the company and get paid for that is one of the best sides of being a developer.
Of course you can go to a company that attracts with business/life opportunity, rather than tech. stack, but nevertheless development cycle there is usually more slow and corporate.
As a significance of "gluing" front end together, I would say that this is becoming an area of extreme expertise and yes, you can safely build your career around that.
I built the entire stack for my current project and the frontend (Angular/Ionic) has taken the most work.
(I am not affiliated with Gitlab)