Senior Software Engineer

Requisition Number: 2397070
Optum is a global organization that delivers care, aided by technology to help millions of people live healthier lives. The work you do with our team will directly improve health outcomes by connecting people with the care, pharmacy benefits, data and resources they need to feel their best. Here, you will find a culture guided by diversity and inclusion, talented peers, comprehensive benefits and career development opportunities. Come make an impact on the communities we serve as you help us advance health equity on a global scale. Join us to start Caring. Connecting. Growing together.
In healthcare, evolution doesn't just happen. It takes innovation, imagination, and a passion for solving problems in new and better ways. And innovation is taking place at a lightning-fast pace every day at Optum. As the fastest growing part of the UnitedHealth Group family of businesses, we're expanding our team in Ireland and creating excellent opportunities for those who want greater purpose and more impact in their work. We'll provide the investment, support, and resources to advance your career. You'll provide the talent, ambition, and drive.
Join a mix of Data and Software engineers in building new pharmaceutical data analytics products that gives our customers new insight into their data. As a Senior Software Developer on our team, you will develop and maintain our back end, handling the APIs that serve our React front end. You will build secure, reliable backend services working closely with product, architecture, security and data engineering colleagues.
Careers with Optum offer flexible work arrangements and individuals who live and work in the Republic of Ireland will have the opportunity to split their monthly work hours between our Dublin or Letterkenny office and telecommuting from a home-based office in a hybrid work model.
Primary Responsibilities:

• API & Service Development: Own the full development lifecycle for the APIs, from requirements and design through implementation, testing, documentation and production support
• Secure Multi-Tenant Architecture: Design and evolve scalable services, collaborate with architecture and security teams on design decisions
• Code Quality & Reviews: Conduct design and code reviews; build automated unit, integration and API contract test
• Agile Collaboration & Technical Guidance: Work with product owners and cross-functional teams to refine requirements and deliver high-quality releases; mentor colleagues and promote reusable components and sound engineering practices
• Performance, Reliability & Delivery: Improve API performance, observability and operational resilience; contribute to CI/CD pipelines, infrastructure automation and secure deployment practices
• Production Support & Troubleshooting: Diagnose and resolve issues address root causes and document operational guidance
• Agentic Development: Use AI coding agents to support planning, implementation, testing and refactoring, with clear task boundaries, human review and validation of generated changes. Protect sensitive data and follow approved security and tooling policies
• Data Engineering Collaboration: Partner with data engineers on API-to-data integration, data contracts, reference data and data quality; understand how pipelines, transformations and data models affect service behaviour

Required Qualifications:

• Building and supporting production backend services with Java and Spring Boot
• Designing and integrating RESTful APIs, with clear contracts, versioning, error handling and automated tests
• Developing, deploying and supporting services on public cloud platforms such as Azure or AWS
• Practical agentic development experience: guiding AI coding agents through multi-step tasks, reviewing generated code and validating results through tests and security checks
• Working with relational databases and SQL, including data access patterns and query troubleshooting
• Experience with Docker and Kubernetes for containerised deployment and operations
• Implementing secure authentication and authorisation, including OAuth 2.0, OpenID Connect and token handling; understanding tenant isolation and role-based access
• Using Git, code reviews and CI/CD pipelines to deliver reliable software collaboratively
• Familiarity with data engineering concepts, including ETL/ELT pipelines, data modelling, data contracts and data quality, and collaborating with data engineers
• Solid problem-solving and communication skills, with experience troubleshooting production issues and contributing to technical decisions

Preferred Qualifications:

• Hands-on infrastructure automation with Terraform, or deeper experience with GitHub Actions
• Experience improving API performance, observability and operational resilience
• Hands-on work with data pipelines, transformations, data lineage or reference data integration beyond foundational familiarity
• Experience mentoring developers and creating reusable components or shared engineering patterns

Please note you must currently be eligible to work and remain indefinitely without any restrictions in the country to which you are making an application. Proof will be required to support your application.
At UnitedHealth Group, our mission is to help people live healthier lives and make the health system work better for everyone. We believe everyone-of every race, gender, sexuality, age, location and income-deserves the opportunity to live their healthiest life. Today, however, there are still far too many barriers to good health which are disproportionately experienced by people of color, historically marginalized groups and those with lower incomes. We are committed to mitigating our impact on the environment and enabling and delivering equitable care that addresses health disparities and improves health outcomes - an enterprise priority reflected in our mission.
Diversity creates a healthier atmosphere: Optum is an Equal Employment Opportunity employer and all qualified applicants will receive consideration for employment without regard to gender, civil status, family status, sexual orientation, disability, religion, age, race, and membership of the Traveller community, or any other characteristic protected by law. Optum is a drug-free workplace. © 2025 Optum Services (Ireland) Limited. All rights reserved.
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