Senior Front-End Software Engineer

Requisition Number: 2386222
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.
We are looking for a Senior Front-End Software Engineer who is passionate about building modern, intuitive and high-quality web user experiences. In this role, you will shape the front end of complex enterprise web applications, use AI to rapidly prototype and explore design ideas, and help define how AI can be integrated meaningfully into the user experience - well beyond the standard chat window.
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:
Front-End Web UX Development

• Act as a subject matter expert in front-end, web-based UX development for enterprise applications
• Design, build, test and maintain responsive, accessible and high-performing user interfaces using modern frameworks such as React, Angular or similar
• Develop reusable UI components, design systems and front-end patterns that promote consistency and maintainability
• Apply sound front-end engineering practices including state management, component architecture, performance optimisation and cross-browser compatibility

UX Design & Best Practice

• Bring a genuine passion for front-end development and a strong eye for user-centred design
• Stay current with best practices and modern approaches to UX design, usability and accessibility (including WCAG standards)
• Contribute meaningfully to front-end design discussions, from early concepts through to detailed interaction design and implementation
• Work closely with product owners, designers and engineers to translate business requirements into intuitive user experiences

AI-Assisted Prototyping & Wireframing

• Use AI tools to rapidly generate ultra-realistic wireframes, mock-ups and interactive prototypes
• Use AI-generated designs to stimulate discussion and gather early feedback from stakeholders and users
• Prototype and iterate quickly through multiple design approaches, helping teams converge on the best solution
• Help establish practical, repeatable workflows for AI-assisted design and prototyping within the team

Complex Web Application Delivery

• Build and enhance front ends for complex, data-rich and workflow-driven web applications
• Design user experiences that simplify complex processes, large data sets and multi-step workflows
• Integrate front-end applications with APIs and backend services in a secure, reliable and performant way
• Troubleshoot UI defects and production issues, perform root-cause analysis and implement sustainable fixes

Full-Stack Support

• Debug and fix backend code where required, particularly within the Microsoft development stack (C#, .NET)
• Collaborate with backend engineers to shape APIs and data contracts that best support the user experience

Team Collaboration

• Participate in code reviews, technical design discussions, Agile delivery and knowledge-sharing activities
• Mentor other engineers in front-end development, UX best practice and AI-assisted design techniques
• Contribute to technical documentation, reusable component libraries and engineering standards
• Follow enterprise standards for security, privacy, compliance, accessibility and software quality

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:

• Bachelor's degree in Computer Science, Engineering, Information Technology, Design, or a related field, or equivalent practical experience
• Proven significant experience in front-end and web-based user experience development
• Proven hands-on experience working with modern front-end frameworks such as React, Angular, Vue, or similar technologies
• Demonstrated advanced proficiency in TypeScript, JavaScript, HTML5, and CSS, including responsive and accessible design principles
• Demonstrated passion for front-end development, supported by a demonstrated solid understanding of modern UX design principles and best practices
• Proven ability to leverage AI tools to rapidly generate wireframes, prototypes, and design concepts while iterating efficiently through multiple design options
• Proven experience developing and supporting complex enterprise-scale web applications
• Proven experience debugging and resolving backend code issues, preferably within Microsoft technology stacks including C# and .NET
• Proven experience integrating front-end applications with RESTful APIs and backend services
• Proven experience utilizing Git, CI/CD pipelines, automated testing frameworks, and Agile delivery practices
• Demonstrated solid troubleshooting, analytical, communication, and collaboration skills

Preferred Qualifications:

• Proven experience modernizing legacy web applications through the adoption of modern frameworks, design patterns, and engineering practices
• Proven experience integrating AI capabilities into user experiences through contextual recommendations, intelligent forms, adaptive interfaces, AI-driven workflows, or similar solutions
• Demonstrated ability to provide informed guidance on AI user experience design, balancing usability, transparency, trust, and user control
• Proven experience utilizing design tools such as Figma and developing or maintaining design systems and component libraries
• Demonstrated familiarity with front-end testing technologies such as Jest, Playwright, Cypress, or similar frameworks
• Proven experience delivering web applications within healthcare, insurance, financial services, or other regulated environments
• Demonstrated understanding of responsible AI, data privacy, security, and human oversight principles as they apply to user-facing AI solutions

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.
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