AI Backend Python Engineer (Software Engineer II) - Chennai, Tamil Nadu

Pfizer, a leading global pharmaceutical company, is seeking an experienced AI Backend Python Engineer (Software Engineer II) for their team in Chennai, Tamil Nadu. This is a full-time, remote position contributing to innovative AI initiatives.

The AI Backend Python Engineer will be instrumental in developing and maintaining robust backend systems that support cutting-edge generative AI applications and large language model (LLM) integrations. This role emphasizes the implementation of scalable, secure, and high-performance services using Python and AWS cloud infrastructure, with mentorship provided by senior engineers.

Key Responsibilities:

• Develop and implement Python-based backend services, particularly using FastAPI, for AI workloads, including LLM integration and generative AI pipelines.
• Design and develop APIs and microservices for efficient model serving and inference, collaborating with senior team members.
• Build and manage AWS-based infrastructure components essential for AI workloads, such as Lambda, API Gateway, and EKS.
• Produce clean, well-tested, and maintainable code adhering to established software development patterns and best practices.
• Integrate advanced LLMs and generative AI models into production systems leveraging frameworks like LangChain, Langfuse, and litellm.
• Implement comprehensive monitoring, logging, and observability features for assigned backend services.
• Actively participate in code reviews and contribute to team knowledge sharing initiatives.
• Diagnose and resolve production issues with the support of senior engineers.
• Collaborate effectively with cross-functional teams to understand requirements and deliver features that drive innovation.

Basic Qualifications:

• 2-4 years of professional software engineering experience in production environments.
• Strong proficiency in Python for backend development.
• Solid understanding of LLMs, generative AI concepts, and modern AI frameworks (e.g., litellm, LangChain).
• Experience with key AWS services including Lambda, API Gateway, and EKS.
• Knowledge of RESTful API design principles and microservices architecture.
• Familiarity with containerization technologies like Docker and version control systems like Git.
• Bachelor's degree in Computer Science, Engineering, or a related field, or equivalent practical experience.
• Excellent problem-solving abilities and a keen attention to detail.

Preferred Qualifications:

• Hands-on experience building APIs for AI/ML workloads in a production setting.
• Experience with FastAPI or other similar Python web frameworks.
• Familiarity with Langfuse for LLM observability and monitoring.
• Knowledge of CI/CD practices and experience with automated testing frameworks.
• Understanding of both SQL and NoSQL database systems.
• Experience with event-driven architectures.
• Strong communication and collaboration skills, with an ability to work effectively within a team environment.