Seasonal jobs that might turn permanent (Chicago)

A retailer and two warehouses near Chicago are hiring seasonal staff. I do not usually post, so bear with me. I would like to avoid a gap in my résumé. Which employers treat seasonal workers well?

Keep everything in writing and save the confirmation numbers. It made the follow-up calls so much easier.

Keep a list of supervisors' names. A reference from one of them helped me land my next job.