Teaching Assistant for children

To work alongside a class teacher in a British school in the centre of Madrid. Hours are Monday - Friday 8:30 - 4:30 (with the exception of Thursday 8:30 - 5:30). 
Contract from Aug 30th - June 30th 
Children are only taught in English (Literacy, Maths, Art, Drama) and age groups range from 2 - 7 years old. 
Looking for native speakers or C1 level of English. 
Monthly salary 850 euros net (approx)