Kathrin Mählmann completed her veterinary studies at the Free University of Berlin in 2008. She then undertook an internship at the University of Veterinary Medicine Hannover Foundation's Clinic for Horses from April 2008 to December 2010. During this time, she also completed her doctoral thesis on immunological therapy for equine melanoma.

From 2011 to 2014, Katrhin pursued a residency in equine surgery at the Equine Clinic in Bern, Vetsuisse Faculty. During her residency, she gained extensive experience in orthopaedic and soft tissue surgery and conducted research focused about an endoscopic technique for examination of the navicular bursa and immunologic aspects of the equine sarcoid. 

In 2015, Kathrin became a Diplomate of the European College of Veterinary Surgeons (ECVS). She then worked as a Senior Physician and Surgeon at a private Clinic for Horses in Grosswallstadt from March 2015 to April 2016, where she managed surgical cases, including emergency and elective procedures.

Since May 2016, Kathrin has been a Senior Assistant at the Equine Clinic of the Free University of Berlin, Department of Orthopaedics and Surgery. In this role, she leads a broad spectrum of surgeries, including fracture repairs and joint surgeries, and contributes to teaching and mentoring students and residents. Her research interests are centered on musculoskeletal conditions in horses, including lameness workup and surgical techniques. She has co-authored book chapters on equine fractures.

Kathrin is actively involved in clinical practice teaching and research, with a focus on advancing equine surgery.