We’re in relentless pursuit of breakthroughs that change patients’ lives.
The Role
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
BASIC QUALIFICATIONS
PREFERRED QUALIFICATIONS
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
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
What the Team is Saying
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Pfizer Compensation & Benefits Highlights
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Parental & Family Support — U.S. materials describe up to 26 weeks of parental leave (including up to 12 paid non‑medical weeks), with phased return‑to‑work plus fertility, adoption, and surrogacy financial support, backup care, lactation support, and caregiver leave. These offerings indicate depth in family‑building benefits and day‑to‑day caregiver resources.
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Healthcare Strength — Core programs commonly include medical, prescription drug, dental, vision, mental‑health/EAP resources, disability insurance, preventive health programs, and free or reduced‑cost vaccinations. Voluntary Benefit Extras and wellness resources broaden coverage and access.
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Retirement Support — Career pages and postings note a 401(k) with company matching plus an additional company retirement savings contribution in some plans. Company materials also reference financial‑planning education and colleague‑directed retirement funds.
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The Company
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.
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Pfizer Offices
Hybrid Workspace
Employees engage in a combination of remote and on-site work.
Typical time on-site:
Not Specified
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