Senior Software Engineer

What You’ll Be Doing 

• Develop and maintain scalable, high-performance server-side applications using Node.js and Express.js. 

• Build and maintain RESTful APIs to support frontend systems and external service integrations. 

• Integrate with PostgreSQL databases using ORM tools such as Sequelize and Knex.js. 

• Design and implement performant and reliable systems by applying appropriate caching strategies and integrating distributed components such as Redis, CDNs, and message queues. 

• Handle file uploads and processing using tools like Multer, ExcelJS, and CSV Parse. 

• Ensure secure authentication using frameworks such as Azure MSAL Node, JWT, and express-session. 

• Optimise backend services for scalability, performance, and security. 

• Collaborate with frontend developers to ensure smooth integration and API consumption. 

• Build and maintain CI/CD pipelines using GitHub Actions and Docker. 

• Manage infrastructure using AWS ECS Fargate, S3, RDS PostgreSQL, Secrets Manager, and CloudFormation. 

• Collaborate with frontend teams using React.js and Material-UI. 

• Use build tools such as Webpack, Babel, Vite, and ESLint. 

• Write and maintain tests using Jest, React Testing Library, Cypress, and Playwright. 

• Participate in code reviews, contributing backend expertise and ensuring best practices are followed. 

• Implement security best practices using Helmet, CORS, SSL/TLS, and rate limiting. 

• Ensure all backend solutions comply with healthcare regulations (e.g., HIPAA, GDPR) and Lilly’s internal compliance standards. 

• Maintain rigorous data privacy and protection protocols throughout the software development lifecycle. 

• Leverage AI tools like GitHub Copilot to accelerate development workflows, improve code quality, and reduce boilerplate. 

• Encourage and mentor team members on responsible and secure use of AI in the software development lifecycle. 

How You Will Succeed 

• Proven expertise in designing and implementing scalable backend architectures using microservices, serverless, and event-driven patterns, grounded in SOLID principles, design patterns, and clean code practices. 

• Demonstrated ability to apply strong system design principles to build modular, robust, and maintainable backend solutions that support long-term scalability and reliability. 

• Hands-on experience with security best practices and compliance in highly regulated environments. 

• Skilled in code review, refactoring, and continuous improvement of backend systems to ensure long-term maintainability and performance. 

• Effective verbal and written communication skills. 

• Ability to work collaboratively across frontend, DevOps, and product teams. 

What You Should Bring 

• Proven experience in backend development using Node.js and Express.js. 

• Strong understanding of API design (REST & GraphQL) and real-time data flow. 

• Proficiency in PostgreSQL and ORM tools (Sequelize, Knex.js). 

• Experience with cloud infrastructure (preferably AWS), CI/CD pipelines, and containerisation (Docker). 

• Bachelor’s degree in computer science, Computer Engineering, or a related field. 

• 5-8 years of professional software development experience.