Sr. Full stack Engineer/Tech Lead

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.

As a Senior Full-Stack Engineer/Tech Lead, you will:

• Have solid hands-on expertise in front-end, back-end and cloud development along with technical leadership qualities in driving a team of experienced cloud full stack developers.
• demonstrate ability to solve a broad set of problems including highly complex ones with at least ReactJS, NodeJS, Python and AWS serverless technologies.
• perform activities such as refactoring and re-platforming and is able effectively apply DevSecOps principles best practice software architecture and development practices
• possess ability to break down moderately complex problems to implement for increased business impact
• support other team members and helps them to be successful. Actively shares learnings with team members
• drive and enforce the team process improvements, ensuring others are brought along in understanding the benefits and tradeoffs
• actively promote new and innovative ideas across multiple teams and capabilities

Key Responsibilities

Technical Leadership (25%)

• Define and drive technical vision, architecture, and engineering standards across full-stack applications
• Lead architectural design reviews and make critical technology decisions
• Establish best practices for code quality, testing, deployment, and operations
• Evaluate and select technologies, frameworks, and tools that align with business objectives
• Champion engineering excellence through code reviews, pair programming, and technical mentorship
• Collaborate with Product and Business teams to translate requirements into scalable technical solutions
• Drive technical roadmap and balance technical debt with feature delivery

Hands-On Development (75%)

• Write high-quality, maintainable, and well-tested code across the full stack (React, Node.js, Python, AWS)
• Build responsive, performant front-end applications using React.js and modern JavaScript/TypeScript
• Develop scalable backend services and APIs using Node.js and Python
• Design and implement serverless architectures using AWS services (Lambda, API Gateway, DynamoDB, S3, etc.)
• Implement CI/CD pipelines and infrastructure-as-code using AWS CDK/CloudFormation/Terraform
• Optimize application performance, scalability, and cost-efficiency
• Debug complex issues across the entire stack and resolve production incidents
• Participate in on-call rotation and ensure system reliability

Team Development & Collaboration

• Mentor and coach engineers at all levels through code reviews, pairing, and technical discussions
• Foster a culture of continuous learning, innovation, and engineering excellence
• Collaborate with cross-functional teams (Product, Design, QA, DevOps) to deliver end-to-end solutions
• Conduct technical interviews and contribute to building a world-class engineering team
• Lead by example with work ethic, technical curiosity, and commitment to quality
• Facilitate knowledge sharing through documentation, tech talks, and training sessions

Required Qualifications

Technical Expertise

• 10+ years of professional software development experience with full-stack development
• 3+ years in technical leadership or senior engineering roles
• Expert-level proficiency in:
  • Front-End: React.js, JavaScript/TypeScript, HTML5, CSS3, modern state management (Redux, Context API, Zustand)
  • Back-End: Node.js, Express.js/Fastify, RESTful APIs, GraphQL
  • Python: Flask/FastAPI/Django, data processing, scripting
  • AWS Serverless: Lambda, API Gateway, DynamoDB, S3, EventBridge, Step Functions, SQS/SNS
• Strong understanding of serverless architecture patterns, microservices, and event-driven design
• Experience with AWS services: CloudFormation/CDK, IAM, CloudWatch, RDS/Aurora, ElastiCache
• Proficiency with SQL and NoSQL databases (PostgreSQL, MySQL, DynamoDB, MongoDB)
• Hands-on experience with CI/CD tools (GitHub Actions, GitLab CI, Jenkins, AWS CodePipeline)
• Strong knowledge of containerization (Docker) and orchestration (ECS, Fargate, Kubernetes is a plus)

Architecture & Design

• Proven ability to design and deliver scalable, secure, and maintainable systems
• Deep understanding of software design patterns, clean code principles, and SOLID principles
• Experience with distributed systems, caching strategies, and performance optimization
• Knowledge of security best practices (OAuth2, JWT, encryption, AWS security services)
• Expertise in API design (REST, GraphQL) and integration patterns

Leadership & Communication

• Demonstrated experience leading technical teams and driving complex projects to completion
• Strong mentorship skills with a track record of developing junior and mid-level engineers
• Excellent communication skills—ability to explain complex technical concepts to non-technical stakeholders
• Experience working in Agile/Scrum environments with cross-functional teams
• Proven ability to balance technical excellence with business priorities and timelines

Problem-Solving & Execution

• Strong analytical and problem-solving skills with attention to detail
• Ability to break down complex problems into manageable, iterative solutions
• Track record of delivering high-quality software on time and within budget
• Experience with production support, debugging, and incident management
• Comfort with ambiguity and rapidly changing priorities

Preferred Qualifications

• Bachelor's or Master's degree in Computer Science, Engineering, or related field (or equivalent experience)
• Experience in highly regulated industries (healthcare, pharma, finance)
• Hands-on experience with:
  • Additional AWS services: AppSync, Cognito, Amplify, Athena, Glue, Kinesis
  • Infrastructure as Code: Terraform, AWS CDK, CloudFormation
  • Testing frameworks: Jest, React Testing Library, Pytest, Cypress, Playwright
  • Monitoring & Observability: CloudWatch, DataDog, New Relic, Sentry
  • Message queues: SQS, SNS, Kafka, RabbitMQ
• Experience with data engineering or ML/AI integration in production systems
• Familiarity with micro-frontends, microservices or design systems
• Preferred Experience with statistical computing, clinical data, or life sciences domains 

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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