On March 10, 2010, he participated at California's pro day and opted to attempt the bench press (24) and short shuttle (4.28), achieving better numbers in both.

[14] He started the Jaguars' season-opening 24–17 victory over the Denver Broncos and finished with three solo tackles and sacked Kyle Orton for the first of his career.

[19] He started all 16 games with 40 combined tackles (21 solo), 2.5 sacks, a pass defended, and a fumble recovery returned for seven yards.

In the season-opener against the Minnesota Vikings, he collected four combined tackles and sacked Christian Ponder in a 26–23 overtime loss.

[20] During a Week 10 loss to the Indianapolis Colts, Alualu recorded five solo tackles and sacked Andrew Luck.

[21] He started all 16 games in 2012 and finished with a career-high 45 combined tackles (34 solo), 3.5 sacks, 1 pass defended, and 1 fumble recovery.

[22] He competed with Jason Babin, Andre Branch, and Jeremy Mincey for the starting defensive end job.

[23] On September 29, 2013, Alualu made a tackle and earned his first full sack of the season on Colts quarterback Andrew Luck during a 37–3 loss.

During the 2015 season, he played all 16 games starting 14 of them, making 26 tackles (18 solo), two sacks, two passes defended, and a fumble recovery.

[15] Alualu competed with Jared Odrick, Yannick Ngakoue, Chris Smith, and Sen'Derrick Marks for the starting defensive end job.

[30] On September 25, 2016, he earned his first start of the season, playing in place of Jared Odrick who suffered a triceps injury the week prior.

The next week, Alualu earned two combined tackles and sacked Andrew Luck, for his first of the season, as the Jaguars defeated the Colts 30–27.

[33][34] He competed with Leterrius Walton, Lavon Hooks, and Roy Philon for a backup defensive end position.

[35] Alualu made his Pittsburgh Steelers debut in their season-opening 21–18 victory over the Cleveland Browns and recorded five combined tackles.

On September 17, 2017, he earned his first start of the season in place of Stephon Tuitt, who suffered a biceps injury the week prior.

In Week 7, he recorded four solo tackles and made his first sack as a Steeler, taking down Cincinnati Bengals quarterback Andy Dalton in a 29–14 victory.

[48][49] He had started at California in the summer of that year, but returned home before fall semester classes to get married and to see the birth of his first child, Tyreé.