Senior Software Engineer

Requisition Number: 2351762
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.
At Optum, we use technology to improve health outcomes and make the healthcare system work better for everyone. Our engineering teams build scalable, secure, and reliable platforms that support millions of users, enable data-driven decision making, and power critical business capabilities across Optum and UnitedHealth Group.
We are looking for a Full Stack Senior Software Engineer who is passionate about building high-quality software, takes ownership of complex technical problems, and enjoys collaborating with cross-functional teams to deliver meaningful business outcomes.
About the Role:
As a Full Stack Senior Software Engineer, you will be a hands-on technical contributor responsible for designing, building, and maintaining software solutions across the full development lifecycle for one of our Realtime Claim Processing Systems. You will work closely with product managers, architects, and fellow engineers to deliver maintainable, scalable, and high-performing systems.
This role requires solid engineering fundamentals, a quality-first mindset, and the ability to independently own and deliver well-defined components or services. You will also support team growth by mentoring junior engineers and contributing to engineering best practices. This also includes evaluating new tools, new techniques, strategies; Automation of common tasks; build of common utilities to drive organizational efficiency with a passion around technology and solutions and influence of thought and leadership on future capabilities and opportunities to apply technology in new and innovative ways.
This is an opportunity to help improve healthcare for millions of individuals.
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:

• Design, develop, test, deploy, and maintain high-quality software solutions
• Own the delivery of complex features or services from design through production
• Build modular, scalable, secure, and reliable applications that meet business needs
• Contribute to technical design discussions and follow established architectural standards
• Write clean, well-tested, and maintainable code (unit, integration, and contract tests)
• Implement and support APIs and microservices with solid contracts and documentation
• Add logging, monitoring, and instrumentation to ensure reliability and performance
• Troubleshoot production issues and participate in support and reliability activities as needed
• Collaborate with Product, Architecture, QA, and Operations teams
• Reduce technical debt and contribute to modernization and automation initiatives
• Actively participate in Agile ceremonies and continuous improvement efforts
• Mentor junior engineers through code reviews, pairing, and technical guidance
• Ensure solutions comply with enterprise security, privacy, and regulatory standards

Technology Responsibilities:

• Develop and deploy services on Microsoft Azure
• Build event-driven and asynchronous integrations (e.g., Event Hubs, Kafka)
• Design and maintain RESTful/GraphQL APIs using Java and Spring Boot
• Work with modern data platforms such as Databricks, ADSL, and Snowflake
• Apply cloud-native design principles for scalability, resiliency, and cost efficiency

You will be rewarded and recognized for your performance in an environment that will challenge you and give you clear direction on what it takes to succeed in your role, as well as providing development for other roles you may be interested in.
Required Qualifications:

• Proven solid experience as a Senior Software Engineer (or equivalent)
• Proven hands-on experience delivering production-grade Java / Spring Boot and Python applications
• Proven experience working with React/Angular
• Demonstrated solid understanding of software design principles, patterns, and clean code practices
• Demonstrated solid understanding of GHA and CICD workflows with Devops collaboration
• Demonstrated solid Understanding or Experience working with Test Automation tools and process
• Proven solid experience working with Observability tools
• Proven experience working with cloud platforms and distributed systems
• Proven experience working with Mongo DB
• Proven experience working in Agile development teams
• Demonstrated ability to independently own technical work and deliver reliably
• Proven experience mentoring junior engineers and contributing to team engineering standards
• Demonstrated solid problem-solving skills and attention to quality

Preferred Qualifications:

• Proven experience in healthcare, data-intensive, or regulated environments
• Proven familiarity with large-scale enterprise platforms

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. © 2026 Optum Services (Ireland) Limited. All rights reserved.
#BBMEMEA