Inclusion Criteria:  Be aged ≥ 18 to ≤ 65 years Be able to provide informed consent Be a current or former member of the US Military Diagnosed with mild TBI as defined by the Department of Veteran's Affairs and Department of Defense Clinical Practice Have a PHQ-9 score of ≥ 5 to 27, indicative of mild or greater depressive symptoms Have ownership of or reliable access to a smartphone with a data plan or internet connecting capabilities  Exclusion Criteria:  Report of starting pharmacological or non-pharmacological treatment for depression within the 3 months prior to trial enrollment Report a recent change in type or dose of antidepressant medications within 12 weeks prior to trial enrollment Report active psychotic or bipolar symptoms Active plan and/or intent of suicide or homicide In the opinion of the investigator, they have other considerations that may adversely affect patient safety, participation, or scientific validity of the data being collected