Hi there, does someone knows if there's a loader for s3 in parquet format?

You may have more luck asking in the Singer.io Slack workspace at https://singer-slackin.herokuapp.com/, since that's where people discuss taps and targets regardless of which runner they're using (Meltano or something else). A quick search there brings me to this extractor: https://github.com/ns-iknox/tap-s3-parquet and this loader: https://github.com/mirelagrigoras/target-parquet, but I'm not sure either is exactly what you're looking for.

Thanks