COINUS Corp. (코인어스) is a South Korean IT services firm founded in 2009 and headquartered in Seoul. The company specializes in HR systems implementation, operation, and maintenance, with an emphasis on SAP HCM, SAP SuccessFactors, and adjacent HR technologies. COINUS entered into a formal SAP partnership covering SAP S/4HANA and SuccessFactors in 2020 and is registered as an SAP partner with reseller and implementer designations. The firm's delivery base spans public sector, financial services, and manufacturing customers in Korea, with services including SAP HR/SuccessFactors implementation, ABAP development, Oracle HR/Peoplesoft work, Cornerstone HR rollouts, IT outsourcing (ITO), and big data analysis system construction. COINUS positions itself as a specialist HR-systems integrator rather than a broad SAP ERP house, and many of its consultants come from a backbone HR technology background. In October 2023, ISTN, a Korean SAP Gold Partner with broader S/4HANA capabilities, acquired COINUS to expand its enterprise software consulting service line, particularly around HR and SuccessFactors. Post-acquisition, COINUS continues to operate under its own brand within the ISTN group and serves as the dedicated SuccessFactors and HR practice for ISTN's joint customer base.