Severino began his professional career in 2006, pitching for the DSL Nationals. He appeared in 13 games, eight of which were starts, going 2-0 with a 0.99 ERA in 45​1⁄3 innings, striking out 69 batters.\n', '

In 2007, he pitched for the DSL Nationals (3-0, 0.48 ERA in 3 games started) and GCL Nationals (1-0, 2.94 ERA in 13 games, five starts), going a combined 4-0 with a 2.06 ERA in 16 games (eight starts). He had 59 strikeouts in 52​1⁄3 innings.\n', '

He split the 2008 season between the Potomac Nationals (0-4, 3.96 ERA in 26 relief appearances) and Hagerstown Suns (4-2, 4.05 ERA in 15 relief appearances), going a combined 4-6 with a 4.00 ERA in 41 relief appearances.\n', '

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