JavaScript framework (transcribed throughout as 'amber') built around strong conventions — many of them borrowed from the Rails community, since co-creator Yehuda Katz was an early Rails contributor. Promoted in the panel as an LTS-friendly choice because it changes less often than other options and fits a Rails mindset. Underlying Glimmer rendering engine was rewritten in Rust and compiled to WebAssembly as part of the LinkedIn rebuild. Uses reactive programming ideas similar to React+MobX.