Principal software Engineer full stack -R3

At Lilly, we unite caring with discovery to make life better for people around the world. We are a global healthcare leader headquartered in Indianapolis, Indiana. Our employees around the world work to discover and bring life-changing medicines to those who need them, improve the understanding and management of disease, and give back to our communities through philanthropy and volunteerism. We give our best effort to our work, and we put people first. We’re looking for people who are determined to make life better for people around the world.

Principal Software Engineering

Job Family: Software Engineering

Time Type: Full time

Job Type: Regular

Level: R3

Post: Internal & External

Come build the next generation of Software Engineering, so we can reach and support more patients digitally!

Lilly’s mission is to develop and maintain software products that meet the needs and requirements of both our internal and external customers. This typically involves a combination of activities such as gathering and analyzing user requirements, designing, and implementing software solutions, testing and debugging code, and maintaining and improving the performance and reliability of the software over time. The goal of software engineering at Lilly is to create high-quality, reliable, and effective software utilizing cutting edge methodologies and integrations to solve Lilly’s real-world problems and provide value to our customers.

What You’ll Be Doing

• Develop and contribute to frontend and backend frameworks supporting business-critical applications.
• Design and build scalable, reusable, and maintainable backend services and APIs.
• Replace commercial off-the-shelf (COTS) systems with modern, in-house scalable solutions.
• Develop user-facing interfaces using React.js, Angular, or Vue.js with a focus on performance and accessibility.
• Coach and mentor junior engineers and help raise the overall technical bar.
• Help define and maintain engineering standards, including CI/CD and code quality practices.
• Collaborate across teams to deliver impactful features with measurable value.
  
  
  

Key Responsibilities

Backend Development

• Experience with backend programming in Java/Python, and Node.js(backend frameworks like Express JS, Hapi JS etc.)
• Design and implement robust APIs (RESTful or GraphQL) and microservices using Node.js and frameworks like Express.js or Koa.js.
• Build and manage scalable backend services with fault-tolerance, performance, and security in mind.
• Integrate with cloud platforms (AWS, GCP, or Azure) and manage infrastructure with CI/CD tools like GitHub Actions or Jenkins.
• Work with databases such as MongoDB and PostgreSQL to store and retrieve structured and unstructured data efficiently.
  
  
  

Frontend Development

• Build responsive and accessible UIs using React.js, Angular, or Vue.js.
• Implement modern UI development practices, including component-based design and state management (e.g., Redux).
• Collaborate with designers and UX teams to implement pixel-perfect interfaces using Material UI, Ant Design, or similar systems.
• Optimize front-end applications for performance and Core Web Vitals.
• Knowledge of accessibility best practices and WCAG 2.2 standards.
• Hands-on experience building responsive, cross-browser compatible applications.
  
  
  

Required Skills

• Strong proficiency in one or more frontend frameworks: React.js, Angular, or Vue.js.
• Solid understanding of JavaScript (ES6+), TypeScript, HTML5, and CSS3.
• Proficient in backend development with Node.js and frameworks such as Express.js or Koa.js.
• Experience with RESTful and GraphQL APIs, microservices architecture, and real-time communication (e.g., WebSockets).
• Practical experience with cloud services (AWS, Azure, or GCP).
• Familiar with state management tools (e.g., Redux, Context API).
• Strong testing experience using tools like Jest, React Testing Library, Cypress, or Playwright.
• Comfortable with frontend build tools like Webpack, Vite, Babel, and linters like ESLint.
• Experience working with CI/CD pipelines, source control (Git), and modern DevOps workflows.
  
  
  

Preferred Qualifications

• Familiarity with Core Web Vitals and frontend performance optimization techniques.
• Experience with component-driven development using a design system (e.g., Material UI, Ant Design).
• Exposure to domain-driven design (DDD), serverless architecture, or event-driven systems.
• Contributions to open-source projects or experience leading technical discussions and architecture reviews.
  
  
  

AI-Enhanced Development

• Leverage AI tools like GitHub Copilot to accelerate development workflows, improve code quality, and reduce boilerplate.
• Demonstrate proficiency in prompt engineering to effectively guide AI tools in generating optimal and context-aware code solutions.
• Use AI-assisted pair programming to support rapid prototyping, test case generation, and debugging.
• Stay informed about the evolving landscape of AI-powered development tools and integrate best practices into day-to-day engineering work.
• Encourage and mentor team members on responsible and secure use of AI in the software development lifecycle.
  
  
  

Soft Skills

• Effective verbal and written communication skills
• Ability to work collaboratively across backend, frontend, DevOps, and product teams
• A high degree of intellectual curiosity and commitment to continuous learning
  
  
  

Basic Qualifications

• Bachelor’s degree in Computer Science, Computer Engineering, or a related technical field.
• 8+ years of hands-on software development experience across frontend and backend systems.
• Demonstrated ability to lead code reviews, guide junior engineers, and build production-grade software.
• Strong foundation in computer science fundamentals, software architecture, and cloud-native patterns.
  
  
  

About The Organization

Tech@Lilly builds and maintains capabilities using pioneering technologies like most prominent tech companies. What differentiates Tech@Lilly is that we create new possibilities through tech to advance our purpose – creating medicines that make life better for people around the world, like data driven drug discovery and connected clinical trials. We hire the best technology professionals from a variety of backgrounds, so they can bring an assortment of knowledge, skills, and diverse thinking to deliver solutions in every area of our business.

Lilly is dedicated to helping individuals with disabilities to actively engage in the workforce, ensuring equal opportunities when vying for positions. If you require accommodation to submit a resume for a position at Lilly, please complete the accommodation request form (https://careers.lilly.com/us/en/workplace-accommodation) for further assistance. Please note this is for individuals to request an accommodation as part of the application process and any other correspondence will not receive a response.

Lilly does not discriminate on the basis of age, race, color, religion, gender, sexual orientation, gender identity, gender expression, national origin, protected veteran status, disability or any other legally protected status.

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