A B1/B2 licenced aircraft engineer with the right qualifications and authorisations can have the same certification rights from certifying a daily inspection up and including that of an RAF Wing Commander doing reds and greens, plus taxiing to ground running and parking slots and doing those tasks too. Obviously they cannot do it all on their own but, if needed, they might even be authorised to certify their own independent inspections. Authorisations are managed through the 145 organisation. The LAEs work is all done with communications to the aircraft’s CAMO who may at worst disagree with the LAEs fault finding. Qualified and authorised LAEs also train and recommend other staff for authorisations too. May I remind you that a CAT C LAE can only sign off a defined scheduled maintenance visit (i.e. depth maintenance not line maintenance).
OED definitions for ‘engineer’ has so many variations so I find it’s best to use the verb: “To engineer a solution or result”.