Is it permissible to work at a car dealership in Canada where some cars are sold with interest (riba) and others without interest?

There is no harm in working at a car dealership, provided that the sales are not conducted in a forbidden manner. It is impermissible to deal with someone who is known to want to purchase a car in a forbidden manner, due to Allah’s saying: "And do not cooperate in sin and aggression." Selling in installments is permissible even if the price is higher than the price of an immediate sale.