A Big Data developer looking to transition to a Senior Technical Consultant role should pursue online courses in areas like data architecture, business acumen, and project management. These courses can help to develop the necessary skills in data strategy, client interaction, and leadership, which are essential for a consulting role. Additionally, gaining practical experience through consulting projects or internships can also be valuable for the transition. If you are interested in getting into this field then check out this video about Anish and how he upskilled and got promoted to a Senior Technical Consultant role with a good salary hike just after completing Data Engineering Course.