Job offers come not from TEPCO but from Mizukami Kogyo, a company whose business is construction and cleaning maintenance. The description indicates only that the work is at a nuclear plant in Fukushima Prefecture. The job is specified as 3 hours per day at an hourly wage of 10,000 yen. There is no information about danger, only the suggestion to ask the employer for further details on food, lodging, transportation and insurance.
Hopefully Tepco is as conscientious about monitoring these guys doses as they are with their own employees.