Expert CUDA programmer needed, sorting and correlation

Hello All, I am looking for an expert CUDA programmer to complete the following tasks in Windows. Please only apply if you very familiar. Please be prepared to do a coding challenge live. Here are the tasks needed: 1) Sort a 1-dimensional array of double / float 2) Sort an 2 dimensional with n-colum array of double / float by a single dimension (rowwise or columnwise) 3) Pearson correlation coefficient of two columns in an 2 dimensional N-column array 4) Spearman correlation coefficient of two columns in an 2 dimensional N-column array (this basically consists of sorting the arrays and calculating the Pearson coefficient on the indices) 5) Kendall correlation coefficients of two columns of an 2 dimensional N-column matrix 6) Covariance of two columns of a 2 dimensional N-column array 7) Covariance matrix for an 2 dimensional N-column array Final deliverable should be performant, memory efficient, and tunable to maximize utilization of a specific processor. coding should be neat and clean, with a reasonable amount of well-formatted comments. Feel free to use additional libraries like cuBLAS to perform the tasks.