What was geordi laforge's rank in star trek?

La Forge had great talent for engineering and a keen judgment for needed modifications in the field. His intense focus enabled him to master the complexities of warp engineering and other starship systems. As a junior officer, his specialties included antimatter power, dilithium regulators, Holodeck computer programs, and climate-control computers. During the Cochrane project he recalled the Phoenix test vehicle's intermix chamber from memory.