This alien officer was played by actor Jimmy Chimarios, who received no credit for this appearance.
According to the novelDesperate Hours, this is Lieutenant Troke, a Tulian, which is a cousin species of the Bolians. Troke served as deputy chief of the sciences division under Saru.
Bridge officer 2
This female crewmember wore a helmet on the bridge of the Shenzhou, her headgear stenciled with the ship's name on the wearer's left side at bottom. Serving at the auxiliary tactical station during the Battle of the Binary Stars, she was injured when her console exploded. Two crewmembers assisted her from the bridge. (DIS: "The Vulcan Hello", "Battle at the Binary Stars")
The novel Desperate Hours identifies the character as Ensign Jira Narwani, a junior tactical officer, and calls her headpiece a tactical helmet. The video "A-Z Glossary" from the official Discovery Twitter account also refers to this character as Narwani. 
The character's helmet was created by prop maker WKFX, who referred to the character as "Snail Girl". 
In Star Trek Online, players can purchase a bridge officer named Marta Okataya, who has a helmet identical to the one worn by this character. 
This transporter chief transported Commander Burnham and Captain Georgiou to the Sarcophagus during their attempt to capture T'Kuvma. He later transported Burnham back to the ship, but was unable to transport Phillipa because her life signs were lost. (DIS: "Battle at the Binary Stars")