Sr. Software Systems Engineer (C#/.NET Developer)

Marathon is searching for a motivated, career and customer-oriented Sr. Software Engineer (C#/.NET Developer) who will work across EDI transaction processing, backend API development, and cloud native systems on AWS. This is a hands-on engineering role with direct impact on how VA healthcare data flows through our platform. This is a 100% Remote role.

JOB DESCRIPTION

• Design, build, and maintain C#/.NET/AWS backend services handling high-volume healthcare EDI transactions (837, 835, etc.)

• Parse, validate, and transform X12 EDI documents

• Debug complex transaction-level issues across payers, clearinghouses, and trading partners

• Write, optimize, and troubleshoot SQL stored procedures including performance tuning, ...