Senior Software Developer

Introduction 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. Overview 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.

How you'll make an impact

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

About You7+ years of software development experience with C# and .NET Framework/.NET Core

Experience with AI-assisted development tools such as Claude Code, Git Hub 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 architectures3+ 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…