If you have data in multiple formats in s3 you could look at Snowflake (https://www.snowflake.com/ https://www.snowflake.com/). They have built in ingestion fun

If you have data in multiple formats in s3 you could look at Snowflake (https://www.snowflake.com/ https://www.snowflake.com/). They have built in ingestion functionality and can translate various formats into their warehouse with minimal effort. You could also look at amazon redshift spectrum which will let you run queries across data in s3. As someone else suggested, you should provide an API access later so that users only have one way to request the data.