Senior data analysts interpret data tracking the various activities of an organization. Transforming masses of data into valuable insight for management to rely on when making decisions is what all data analysts strive to do, whether senior, junior, or anything in between.
As a senior data analyst, though, you will supervise your junior colleagues' work and report to the head data analyst, keeping an eye on your performance. You will be in contact with stakeholders and management, and other departments to improve business processes to the fullest.
Coming up with new and more efficient business solutions is what you will be expected to do by continually modifying existing workflow. You will code, debug, test, support, and document existing applications, sometimes designing new ones according to business requirements.