Concepta has an employee rating of 4.0 out of 5 stars, based on 19 company reviews on Glassdoor which indicates that most employees have a good working experience there. The Concepta employee rating is in line with the average (within 1 standard deviation) for employers within the Information Technology industry (3.9 stars).
They don't pay according with their own rules. Sometimes I did get a delay almost 90 days without payment, with some polish excuses but they didn't have much transparency on it.