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

SAIC is a mission integrator providing technology and engineering solutions across defense, space, intelligence, and civilian markets. The company is seeking a Senior Software Systems Engineer to develop and support C#/.NET and AWS backend services that process high-volume healthcare EDI transactions, APIs, and cloud-native systems. The role also involves database optimization, production support, technical planning, testing, code reviews, and collaboration within an agile software development team.

Responsibilities:

• 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

Requirements:

• 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
• 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
• US Citizenship with the ability to obtain and maintain a Public Trust clearance
• 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