an expert, but perh. with connotations of nerdiness etc.

a scientific expert, a bogle is a goblin, and bohea (bo HE) is a black tea

Boffin is a platform game released in 1985 by Addictive Games for the Acorn Electron and BBC Micro. The cassette contained two different versions of the game. The first version on the tape (confusingly referred to as version 2 and sometimes known as Boffin 2) featured twenty five caverns and was playable on both machines.

Technical chappie or geek, responsible for school computers and other equipment.

a scientist or technician, especially one engaged in military research.