Job description

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, query analysis, and complex data transformations • Work with XML object store data: query, parse, and manipulate structured XML within MSSQL • Write clean, testable, well-documented code and participate actively in code review • Contribute to shared platform libraries and services used across multiple product initiatives • Performs technical planning, high level and detailed requirements definition, test planning and execution with team members and stakeholders on a daily basis • Serve as an active member of the software development team participating in daily stand-ups • Deploy, support and ensure the performance, quality, and responsiveness of application • Provide development support, as needed, for solutions deployed to production • Implement long term solutions and building blocks within the agile framework for improved reusability • Apply and promote best software engineering practices • Use Integrated Development Environment (IDE) tools to include Visual Studio and Git Education • Bachelor's or master's degree in computer science, electronics engineering or other engineering or technical discipline is required. Experience • Minimum of 8 years of experience in software development using C#/.NET technologies • Proven track record of working on complex software projects and leading development initiatives • Experience with designing, developing, and deploying enterprise-level applications Requirements • Strong proficiency in C#/.NET ecosystem • Proficiency in developing back-end applications using design and integration patterns • Hands-on AWS experience (serverless, messaging, storage, databases) preferred • Strong SQL skills: writing and optimizing stored procedures, troubleshooting execution plans, performance tuning in MSSQL • Proficient with Git and GitHub • Experience with MSSQL or similar relational databases • Proficiency in database design and development, including working with SQL Server and Entity Framework. • Familiarity with cloud platforms (e.g., Microsoft Azure, AWS) and services. • Understanding of continuous integration/continuous deployment (CI/CD) practices and tools (e.g., AWS CodePipeline, CodeBuild, CodeDeploy). • Knowledge of unit testing frameworks and tools (e.g., NUnit, xUnit, MSTest). - Proficiency in using development tools like Visual Studio and Visual Studio Code. • Excellent problem-solving and analytical skills. • Strong communication and interpersonal abilities. • Ability to work independently and as part of a large team. • Attention to detail and commitment to producing high-quality software. • Ability to prioritize tasks and manage time effectively using JIRA. • Experience with agile development methodologies (e.g., Scrum, Kanban). • Familiarity with DevOps practices and infrastructure as code (IaC). • Ability to conduct code reviews and provide constructive feedback. • Experience with performance tuning and optimization of applications. • Knowledge of microservices and event-driven architecture and containerization technologies (e.g., Docker, ECS, EKS) is a plus. • Experience with healthcare payer/PBM systems, clearinghouses, or pharmacy operations is a plus Clearance Requirement: • US Citizenship with the ability to obtain and maintain a Public Trust clearance

Requirements

Must-haves

Sr. Software Systems Engineer (C#/.NET Developer)
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, query analysis, and complex data transformations
Work with XML object store data: query, parse, and manipulate structured XML within MSSQL
Write clean, testable, well-documented code and participate actively in code review
Contribute to shared platform libraries and services used across multiple product initiatives
Performs technical planning, high level and detailed requirements definition, test planning and execution with team members and stakeholders on a daily basis
Serve as an active member of the software development team participating in daily stand-ups
Deploy, support and ensure the performance, quality, and responsiveness of application
Provide development support, as needed, for solutions deployed to production
Implement long term solutions and building blocks within the agile framework for improved reusability
Apply and promote best software engineering practices
Use Integrated Development Environment (IDE) tools to include Visual Studio and Git
Bachelor's or master's degree in computer science, electronics engineering or other engineering or technical discipline is required.
Minimum of 8 years of experience in software development using C#/.NET technologies
Proven track record of working on complex software projects and leading development initiatives
Experience with designing, developing, and deploying enterprise-level applications
Strong proficiency in C#/.NET ecosystem
Proficiency in developing back-end applications using design and integration patterns

Nice-to-haves

Hands-on AWS experience (serverless, messaging, storage, databases) preferred
Knowledge of microservices and event-driven architecture and containerization technologies (e.g., Docker, ECS, EKS) is a plus.
Experience with healthcare payer/PBM systems, clearinghouses, or pharmacy operations is a plus

Application prep

Use the role’s language and application details while tailoring your materials.

Keywords to mirror

apiawssqlagileazureci/cdjirascrumdocker

Platform: jobdiva
Effort: medium