Because fluency in SQL is key to success in Data Science roles, we have candidates complete a technical assessment that gauges their SQL skills. However, for your test you can use any SQL dialect you’re comfortable with. The SQL ScreenNow for the moment you’ve been waiting for: the SQL screen! As we addressed above, Twitch Data Scientists primarily work with a database called Redshift, whose dialect derives from Postgres. You can use any SQL dialect you’re comfortable with during the screening.