Principal Software Engineer

HHAeXchange is hiring a Principal Software Engineer to set technical direction and lead hands-on delivery across engineering teams. The role focuses on API-first healthcare data exchange, modernizing legacy applications, and ensuring software quality, security, reliability, and accessibility.

Responsibilities:

• Set the technical direction for the systems that one or more teams own. Record major decisions, the options considered, and the reason for each choice in Architecture Decision Records (ADRs)
• Write, review, and ship production code on a regular basis. Focus on work that carries high risk or that sets a pattern other engineers will follow
• Guide the gradual modernization of legacy applications into modern services. Replace one part at a time while the old and new parts run together (the strangler pattern), so that feature delivery continues. Define the order of work, the rollback plan for each step, and the measures that show progress
• Design and review solutions that exchange healthcare data using HL7, FHIR, and X12 EDI. Account for differences between trading partners, version changes, error handling, and reconciliation of data between systems
• Own the system-wide qualities of performance, reliability, availability, scalability, security, and accessibility. Define measurable targets, such as service level objectives (SLOs), and review results with the teams
• Make sure designs protect PHI and follow HIPAA requirements. Apply least-privilege access, audit logging, encryption, and secure coding practices based on OWASP guidance
• Define and maintain coding standards, design review practices, project templates, and automated checks. Make them easy to find and easy to follow, so that quality holds regardless of team size or turnover
• Set practical guidance for the responsible use of AI coding tools. Include how AI-generated code is reviewed and tested, and which data may never be entered into these tools, such as PHI
• Coach engineers at all levels. Give specific written feedback in design reviews and code reviews, and explain the reasons behind recommendations
• Work with Product Management, Product Owners, Quality Assurance, and Architecture to define scope, assess feasibility, and turn business needs into technical plans
• Identify technical risks early. State each risk plainly, describe the options, and track the chosen mitigation until it is complete
• Act as a primary technical contact for executives and business partners. Explain technical trade-offs in plain language to both technical and non-technical audiences
• Evaluate new tools and methods against clear criteria, such as pilot scope, success measures, and who will support the technology in production, before recommending adoption
• Other duties as assigned by the supervisor or an HHAeXchange leader

Requirements:

• B.S. or M.S. degree in Computer Science, Engineering, or a related field, or equivalent significant industry experience
• 8 or more years of professional software engineering experience in a software product company, building scalable, high-performance systems
• 5 or more years of experience building healthcare software, including handling of PHI under HIPAA
• Hands-on experience with HL7 and FHIR in production systems
• Strong production experience with C# and the .NET platform
• Working knowledge of at least one other language, such as Python or Java
• Experience designing, building, and operating software as a service (SaaS) on AWS or a similar cloud, using microservices, containers (such as Docker and Kubernetes), and serverless services
• Solid understanding of relational databases (SQL Server, PostgreSQL) and NoSQL databases, including diagnosing performance problems
• Experience building applications that meet HIPAA requirements, with knowledge of identity and access management, encryption, audit logging, and OWASP secure coding practices
• Record of leading technical work across more than one team without formal authority, and of mentoring engineers
• Experience with Agile methods, continuous integration and continuous delivery (CI/CD), and DevOps practices
• Strong analytical skills and a record of delivering practical solutions
• Clear written and spoken communication, including the ability to explain complex technical topics to technical and non-technical audiences
• Experience with X12 EDI transactions such as eligibility, claims (837), and remittance (835)
• Experience modernizing a legacy enterprise web application into modern services without a full rewrite
• Experience with TypeScript and Angular, or a similar framework, at enterprise scale
• Experience operating systems that communicate through messages or events, including change data capture (CDC)
• Experience delivering software that meets Web Content Accessibility Guidelines (WCAG) in an enterprise application
• Practical experience using AI coding tools, and the ability to describe the guardrails you use
• Knowledge of Medicaid, home and community-based services, or electronic visit verification (EVV)