Pfizer

AI Backend Python Engineer (Software Engineer II) - Evergreen REQ

Posted Yesterday

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Chennai, Tamil Nadu, IND

Hybrid

Mid level

Artificial Intelligence • Healthtech • Machine Learning • Natural Language Processing • Biotech • Pharmaceutical

We’re in relentless pursuit of breakthroughs that change patients’ lives.

The Role

The AI Backend Python Engineer will develop backend systems for generative AI applications, focusing on Python and AWS integrations, building APIs, and ensuring code quality and performance while collaborating with teams.

Summary Generated by Built In

Job Description
The AI Backend Python Engineer (SE II) will develop and maintain backend systems that power generative AI applications and large language model (LLM) integrations. This role focuses on implementing features for scalable, secure, and high-performance services using Python and AWS cloud infrastructure, with guidance from senior engineers.
This is an individual contributor role.
KEY RESPONSIBILITIES

Implement Python-based backend services (on FastAPI) for AI workloads, including LLM integration and generative AI pipelines
Develop APIs and microservices for model serving and inference with guidance from senior team members
Build and maintain AWS-based infrastructure components for AI workloads (e.g., Lambda, EKS)
Write clean, well-tested, and maintainable code following established patterns and best practices
Integrate LLMs and generative AI models into production systems using frameworks like LangChain, Langfuse, and litellm
Implement monitoring, logging, and observability features for assigned backend services
Participate in code reviews and contribute to team knowledge sharing
Debug and resolve production issues with support from senior engineers
Collaborate with cross-functional teams to understand requirements and deliver features

BASIC QUALIFICATIONS

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

PREFERRED QUALIFICATIONS

Hands-on experience building APIs for AI/ML workloads in production
Experience with FastAPI or similar Python web frameworks
Familiarity with Langfuse for LLM observability
Knowledge of CI/CD practices and automated testing
Understanding of database systems (SQL and NoSQL)
Experience with event-driven architectures
Strong communication skills and ability to work collaboratively in a team environment

Work location assignment : Remote
Pfizer is an equal opportunity employer and complies with all applicable equal employment opportunity legislation in each jurisdiction in which it operates.
Information & Business Tech

Top Skills

AWS

Docker

Eks

Fastapi

Git

Lambda

Langchain

Langfuse

Litellm

Python

Restful Apis

What the Team is Saying

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The Company

HQ: New York, NY

121,990 Employees

Year Founded: 1848

What We Do

Our purpose ensures that patients remain at the center of all we do. We live our purpose by sourcing the best science in the world; partnering with others in the healthcare system to improve access to our medicines; using digital technologies to enhance our drug discovery and development, as well as patient outcomes; and leading the conversation to advocate for pro-innovation/pro-patient policies.

Why Work With Us

We are the inventors, the problem solvers, the big thinkers — those who surmount any hurdle to deliver breakthrough medicines to the people who are counting on them the most.