[pawelduda]

For one person stack, you won't have to worry about hiring devs specialized in your tech. That makes Elixir/Phoenix even more attractive.

One caveat, if your backend will be integrating with many external services, in other languages with larger active communities you may find API clients/wrappers that just work. In your Phoenix app, it will be more likely respective packages won't have solid maintenance so expect having to patch things by yourself or reinvent from scratch.