Senior Software Developer

Arthur J. Gallagher · San Diego

Apply on the company website

At Gallagher, we help clients face risk with confidence because we believe that when businesses are protected, they’re free to grow, lead, and innovate. You’ll be backed by our digital ecosystem: a client-centric suite of consulting tools making it easier for you to meet your clients where they want to be met. Advanced data and analytics providing a comprehensive overview of the risk landscape is at your fingertips.

Here, you’re not just improving clients' risk profiles, you’re building trust. You’ll find a culture grounded in teamwork, guided by integrity, and fueled by a shared commitment to do the right thing. We value curiosity, celebrate new ideas, and empower you to take ownership of your career while making a meaningful impact for the businesses we serve.

If you’re ready to bring your unique perspective to a place where your work truly matters; think of Gallagher.

We are seeking an experienced Senior Software Developer to join our engineering team, specializing in Healthcare Insurance and Electronic Data Interchange (EDI) solutions for medical insurance operations. This role requires deep technical expertise in C# and the Microsoft technology stack, combined with proven experience in healthcare transaction processing, third-party system integrations, and modern AI-assisted development practices. You'll play a critical role in building and maintaining the systems that process healthcare transactions for our clients while integrating with external partners and leveraging cutting-edge development tools. Ideally local to the San Diego area.

• Design, develop, and maintain EDI transaction processing systems for healthcare claims, eligibility verification, and remittance advice (835, 837, 270/271, 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 full SDLC activities including requirements gathering, design, development, testing, deployment, and maintenance
• Leverage 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 our healthcare platform

• 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
• 3+ years of hands-on experience with healthcare EDI transactions (X12 standards: 837, 835, 270/271, 276/277, 834)
• Strong proficiency in the Microsoft technology stack: ASP.NET Core, SQL Server, Azure services
• Deep understanding of HIPAA regulations and healthcare data security requirements
• Proven experience with full Software Development Life Cycle (SDLC) methodologies including Agile/Scrum
• Demonstrated 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

Preferred Qualifications

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

Technical Environment

• Languages: C#, SQL, PowerShell, JavaScript/TypeScript
• Frameworks: .NET 6+, ASP.NET Core Web API, Entity Framework Core
• Databases: SQL Server, Azure SQL, Redis
• Tools: Visual Studio, Visual Studio Code, Azure DevOps, Git, Docker
• Cloud: Microsoft Azure (App Services, Functions, Service Bus, Storage, Key Vault)
• EDI: X12 transaction sets, EDI translation engines
• AI Tools: Claude Code, GitHub Copilot, and other AI-assisted development platforms
• API: REST, OpenAPI/Swagger, OAuth 2.0, JWT authentication

At Gallagher, we believe supporting our colleagues goes far beyond the role itself. For more information, visit our Benefits page.

• Competitive compensation
• Comprehensive benefits programs designed to support your well-being 
• Career development opportunities and ongoing learning 
• A collaborative, people-first culture with accessible leadership 
• The opportunity to do meaningful work with global reach and local impact 

At Gallagher, we are dedicated to building an inclusive and authentic workplace. If your past experience doesn’t align perfectly, we encourage you to join our Talent Community to stay connected to additional career opportunities. At times, we will consider transferable skills from previous roles.

Gallagher is an affirmative action/equal opportunity employer (Minorities/Females/Veterans/Disabled)

• Design, develop, and maintain EDI transaction processing systems for healthcare claims, eligibility verification, and remittance advice (835, 837, 270/271, 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 full SDLC activities including requirements gathering, design, development, testing, deployment, and maintenance
• Leverage 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 our healthcare platform

• 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
• 3+ years of hands-on experience with healthcare EDI transactions (X12 standards: 837, 835, 270/271, 276/277, 834)
• Strong proficiency in the Microsoft technology stack: ASP.NET Core, SQL Server, Azure services
• Deep understanding of HIPAA regulations and healthcare data security requirements
• Proven experience with full Software Development Life Cycle (SDLC) methodologies including Agile/Scrum
• Demonstrated 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

Preferred Qualifications

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

Technical Environment

• Languages: C#, SQL, PowerShell, JavaScript/TypeScript
• Frameworks: .NET 6+, ASP.NET Core Web API, Entity Framework Core
• Databases: SQL Server, Azure SQL, Redis
• Tools: Visual Studio, Visual Studio Code, Azure DevOps, Git, Docker
• Cloud: Microsoft Azure (App Services, Functions, Service Bus, Storage, Key Vault)
• EDI: X12 transaction sets, EDI translation engines
• AI Tools: Claude Code, GitHub Copilot, and other AI-assisted development platforms
• API: REST, OpenAPI/Swagger, OAuth 2.0, JWT authentication

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