Collaborative predictive modeling

How do you share modeling work among several programmers?

Our team has split apart the work of writing the SQL code to create our dataset. However, we will soon need to build a machine learning model.

My machine learning approach is a linear/iterative process. Read data in, then split data, then normalize, then try model A, model B, score the model, and go back to tweak various hyperparameters. Experiment.

Outside of pair programming, how can you distribute/share this work?