That's a viable strategy. Get hired, fit in, then be virtuosically incompetent.
I remember reading about a Democratic activist during one of the presidential campaigns, who got a job working in some random local Republican office somewhere. He was doing lots of light sabotage, when he caught the flu. He wanted to stay home, but he dragged himself to the office when nobody was around, and smeared his disease-ridden saliva all over the office, on doorknobs, keyboards, etc.
Within a week, most of the people in the office were down sick with the flu in the middle of a presidential election.
Street-level biological terrorism.