Above a Korean fried chicken restaurant in Jackson Heights, Queens, Showkat Khan worked the room of mostly Bangladeshi men, speaking Bengali with a few English phrases mixed in, his enthusiastic message of opportunity broadcast through a crackling amp. At one point, he held aloft a copy of New York City’s Civil Service newspaper, The Chief.

“You are here to make money in this country, and to get a better life,” Mr. Khan said.

There was more than one way toward that American dream, he acknowledged, outlining a few options. But one path seemed to stand above the others, if only because Mr. Khan had already paved the way: He is a traffic enforcement agent.

Mr. Khan is part of an influx of Bangladeshi immigrants who earn a living by writing parking summonses for the city, a curious and growing presence navigating the choking traffic and bumper-to-bumper sea of parked cars.

Bangladeshi immigrants, who represent less than 1 percent of the city’s population, now make up between 10 percent and 15 percent of the 3,000 traffic agents, Robert Cassar, the president of the union representing the agents, said.