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PfizerPF

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

Pfizer Inc. is a leading global biopharmaceutical company committed to innovation, with a history spanning over 170 years.

Pfizer

Employee count: 5000+

India only

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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

About the job

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Posted on

Job type

Full Time

Experience level

Education

Bachelor degree

Experience

2 years minimum

Experience accepted in place of education

Location requirements

Hiring timezones

India +/- 0 hours

About Pfizer

Learn more about Pfizer and their company culture.

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Pfizer Inc. is an American multinational pharmaceutical and biotechnology corporation that has its headquarters at The Spiral in Manhattan, New York City. Established in 1849 by two German entrepreneurs, Charles Pfizer and his cousin Charles F. Erhart, the company initially began its journey with the production of a chemical compound called santonin, which was quite successful. Over the years, Pfizer has evolved significantly, moving from a tiny manufacturer to one of the world’s premier biopharmaceutical companies.

Today, Pfizer is recognized not just for its legacy but also for its forward-looking approach, focusing on relentless scientific pursuits and groundbreaking medicines, including vaccines and therapeutic treatments. The company is deeply invested in research and development across various medical fields including immunology, oncology, cardiology, and neurology. Pfizer’s innovative products have substantially improved health outcomes worldwide, particularly their recent contributions in the fight against COVID-19, where the Pfizer-BioNTech vaccine gained global recognition. The company prioritizes the well-being of patients by continuously applying science and utilizing their global resources to create life-changing therapies.

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Pfizer

Company size

5000+ employees

Founded in

1849

Chief executive officer

Albert Bourla

Employees live in

View company profile

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