There's the occasional screenshare, but nothing I've seen that would qualify as "pair programming" IMHO. As for learning multiple frameworks, when you have the chance to influence the decision-making for a new app (which is rare - in any job), it's always nice to have knowledge of many different languages / frameworks / platforms / etc. But it's not like it's required. If you're on the team and all you know is Angular, they're not gonna expect you to offer a detailed evaluation of Svelte, Vue, React, etc.
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There's the occasional screenshare, but nothing I've seen that would qualify as "pair programming" IMHO. As for learning multiple frameworks, when you have the chance to influence the decision-making for a new app (which is rare - in any job), it's always nice to have knowledge of many different languages / frameworks / platforms / etc. But it's not like it's required. If you're on the team and all you know is Angular, they're not gonna expect you to offer a detailed evaluation of Svelte, Vue, React, etc.