The Senior Engineer is an upper-level enemy ship that appears uncommonly.

The Senior Engineer has a bit more health than a Pirate or Hunter, and fires two pulse balls (from its bridge) that apply an EMP effect, slowing the player significantly, and increasing the damage of future pulse balls' damage. In addition to that, it has a cannon tower mounted on the front that is basically a weaker version of a Pirate's cannon tower. This enemy's weapon has its own unique appearance. This is one of two non-boss enemies that has more than one weapon. The other being the Hydra/Drake class aircraft.

Its standard variant is the Engineer.

Fortress Destroyer Enemies
Ships Skimmer (Speeder) · Raider (Pirate) · Ranger (Hunter) · Engineer (Senior Engineer) · Brimstone (Purifier) · Basher (Crasher) · Zealot (Fanatic) · Skirmisher ·
Aircraft Viper (Asp) · Locust (Harbringer) · Hydra (Drake) · Raven ·
Towers Cannon Tower (Barrage Tower) · Cannon Battery · Sea Cannon (Blaster Tower) · Missile Tower (Onslaught Tower) · Missile Battery · Sea Missile (Splinter Tower) · Onslaught Battery · Bridge Tower · Barrage Battery · Missile Cluster ·
Bosses Herald · Vanguard (Bloodguard) · Hive (Brood) · Leviathan · Nexus (Median) · Kraken (Kraken v2) · Black Prince (Phantom) ·
Other Plasticyte · Ship of the Dead · Broken Tower · Metal Gate
Buildings Shipyard · Air Base · Shield Generator · Storage Yard

Enemies listed in parentheses () following another enemy are the elite form of that enemy. If there is no elite form listed, that means one does not exist or has not yet been added to the game.