Senior Software Developer

Gallagher•San Diego, CA

About The Position

Gallagher is seeking an experienced Senior Software Developer for its engineering team, specializing in healthcare insurance and Electronic Data Interchange (EDI) solutions for medical insurance operations. The role builds and maintains healthcare transaction-processing systems, integrates with external partners, and uses AI-assisted development tools. The position is ideally suited to someone local to the San Diego area. The developer will design, develop, and maintain systems for healthcare claims, eligibility verification, and remittance advice; build C#/.NET applications for insurance carrier operations and benefits administration; and implement RESTful integrations with healthcare systems, clearinghouses, pharmacy benefit managers, and partner platforms. The role also includes HIPAA-compliant implementation, technical leadership, stakeholder collaboration, full SDLC participation, issue resolution, performance optimization, and contributions to platform architecture and technology strategy. Gallagher describes its workplace as collaborative, grounded in integrity, and committed to enabling employees to take ownership of their careers and make a meaningful impact. Compensation and benefits information includes competitive compensation, comprehensive benefits programs, career development and ongoing learning, accessible leadership, and meaningful work with global reach and local impact.

Requirements

At least 7 years of software development experience with C# and .NET Framework/.NET Core.
Experience with AI-assisted development tools such as Claude Code, GitHub Copilot, Cursor, or similar platforms.
Strong experience designing and implementing RESTful APIs and third-party system integrations.
Proficiency with modern development tools and practices, including Git, CI/CD pipelines, containerization, and cloud-native architectures.
At least 3 years of hands-on experience with healthcare EDI transactions and X12 standards, including 837, 835, 270/271, 276/277, and 834.
Strong proficiency with the Microsoft technology stack, including ASP.NET Core, SQL Server, and Azure services.
Deep understanding of HIPAA regulations and healthcare data security requirements.
Proven experience with full SDLC methodologies, including Agile/Scrum.
Ability to manage stakeholder expectations and communicate technical concepts to non-technical audiences.
Experience with EDI translation software and healthcare clearinghouse integrations.
Strong problem-solving skills and attention to detail in complex healthcare data environments.
Excellent written and verbal communication skills.

Nice To Haves

Hands-on experience with Claude Code, Gemini, Copilot, Cursor, or other AI development assistants.
Experience with on-premises and cloud platforms, Azure preferred, and microservices architecture.
Knowledge of HL7, FHIR, or other healthcare interoperability standards.
Experience with message queuing systems such as Azure Service Bus or RabbitMQ.
Proficiency with modern frontend frameworks such as React, Angular, or Vue.js.
Familiarity with claims adjudication systems, benefits administration platforms, and insurance carrier operations.
Experience with automated testing frameworks such as xUnit, NUnit, or Moq, and test-driven development.
Background in healthcare payer systems or medical billing operations.
Understanding of VEBA plans and benefits administration.
Experience with monitoring and observability tools such as Application Insights, Datadog, or Grafana.
Certifications in Microsoft technologies or healthcare IT standards.

Responsibilities

Design, develop, and maintain EDI transaction-processing systems for healthcare claims, eligibility verification, and remittance advice, including 835, 837, 270/271, and 276/277 transactions.
Build and enhance C#/.NET applications supporting medical insurance carrier operations and benefits administration.
Design and implement RESTful API integrations with third-party healthcare systems, clearinghouses, pharmacy benefit managers, and partner platforms.
Lead technical implementation of HIPAA-compliant EDI solutions and ensure regulatory adherence.
Collaborate with business analysts, product owners, and healthcare operations teams to translate requirements into technical solutions.
Manage stakeholder relationships across IT, claims operations, provider networks, compliance, client services, and external integration partners.
Participate in requirements gathering, design, development, testing, deployment, and maintenance across the full SDLC.
Use modern AI development tools to enhance productivity and code quality.
Provide technical leadership and mentorship to development team members.
Troubleshoot and resolve complex EDI transaction issues, API integration challenges, and system connectivity problems.
Optimize system performance and implement best practices for scalability and reliability.
Contribute to architecture decisions and technology strategy for the healthcare platform.