I'm the CEO of a two-men company (for now), and we're both software engineers:<p><pre><code> - Always used: Javascript/Typescript, GraphQL, Kubernetes, Tekton
- Often used: Go/Python, Hasura & PostgreSQL
- Rarely used: Elixir (we're planning to move our code-base to it, but that's not a priority)
</code></pre>
For a R&D job, I would require:<p><pre><code> - intensive experience with at least one language, ideally one we use
- some experience with a database, ideally PostgreSQL
- optionally some experience with Docker
- know how to use the shell and the terminal
</code></pre>
IMHO, languages are just different syntax for the same patterns, and a good dev should be able to apply them in any language. There is a learning curve of course, but if you're a senior Java developer, I believe you will not have a hard time learning Typescript/Python or Go.<p>I'm interested in how people think, debug, and solve problems, not in the amount of line of code they're able to write. In fact, I'd rather recruit someone able to remove code instead of adding more.