AI Build Engineer — Production-Grade Full-Stack

Pfizer Belgium; Montpelier (VT); Hybrid; USD 177,000 - 294,000; Full time

Benefits offered by this job

401(k) with Pfizer matching

Pfizer Retirement Savings Contribution

Paid vacation, holidays and personal/s

Health benefits (medical, prescription

Job summary

Pfizer Belgium is seeking a senior Build Engineer to own hands-on software delivery for the Medical Affairs AI Acceleration portfolio. You will turn architecture and requirements into production-grade AI systems, writing full-stack code and verifying AI-generated code to ensure production reliability.

You’ll partner with architecture, data integration, product management, and UX to deploy end-to-end solutions—from MVPs to production-grade platforms—with strong emphasis on verifiability and

Qualifications

• Bachelor’s degree in Computer Science, Engineering, or related field.
• 8+ years of hands-on software engineering experience.
• Experience building and shipping production software across full stack with multiple languages/frameworks.
• Experience integrating AI/ML or LLM-based capabilities into production systems.
• Experience taking prototypes/MVPs through to production-grade, scalable systems.
• Experience with AWS or Azure, API-first design, and CI/CD.
• Experience with Agile/Scrum delivery frameworks.
• Strong verification and code-review discipline, including AI-generated code.
• Experience designing and optimizing LLM/agent prompts for token efficiency.
• Strong written communication with clear technical documentation.

Responsibilities

• Build, test, and ship production-grade software across the stack.
• Integrate Agentic AI, LLM-based capabilities, and RAG pipelines.
• Move validated prototypes to production-grade systems.
• Write and maintain code meeting engineering standards.
• Document code, APIs, and system decisions clearly.

Skills

Full-stack development

AI/ML integration

Cloud architecture (AWS/Azure)

CI/CD

Agile/Scrum

Code verification & review (AI)

LLM/agent prompts optimization

Technical documentation

Written communication

Cross-functional collaboration

Education

Bachelor's degree in Computer Science, Engineering, or related field

Job description

Pfizer Belgium is seeking a senior Build Engineer to own hands-on software delivery for the Medical Affairs AI Acceleration portfolio. You will turn architecture and requirements into production-grade AI systems, writing full-stack code and verifying AI-generated code to ensure production reliability.

You’ll partner with architecture, data integration, product management, and UX to deploy end-to-end solutions—from MVPs to production-grade platforms—with strong emphasis on verifiability and