Senior Build Engineer, AI Systems & Production

Pfizer Belgium; Cheyenne (WY); Hybrid; USD 177,000 - 294,000; Full time

Job summary

Pfizer Belgium is seeking a hands-on Senior Build Engineer to own end-to-end software delivery for the Medical Affairs AI Acceleration portfolio. You will write, test, and ship production-grade AI-enabled systems, turning prototypes into scalable solutions with strong verification of AI-generated code.

You will collaborate with Architecture, Data Integration, Product Management, and UX to deliver AI-powered platforms across the full stack, ensuring quality gates and maintainability in production.

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 the full stack, with the ability to work across multiple languages and frameworks as needed.
• Experience integrating AI/ML or LLM-based capabilities into production systems.
• Experience taking prototypes/MVPs through to production-grade, scalable systems.
• Experience with modern cloud architecture (AWS or Azure), API-first design, and CI/CD practice.
• Experience with Agile/Scrum delivery frameworks.
• Strong verification and code-review discipline, including review of AI-generated code.
• Experience designing and optimizing LLM/agent prompts and workflows for token efficiency, balancing cost, latency, and output quality at production scale.
• Strong written communication skills, with a track record of producing clear, current technical documentation for code, APIs, and system design decisions.

Responsibilities

• Build, test, and ship production-grade software across the stack.
• Integrate Agentic AI, LLM-based capabilities, and RAG pipelines into Medical Affairs products.
• Take validated prototypes and MVPs through to production-grade systems, applying quality gates and standards.
• Write and maintain code that meets engineering standards for quality and reuse.
• Document code, APIs, and system design decisions clearly and consistently.
• Partner with Solution Architecture, Data Integration Engineer, Product Management, and UX to translate requirements into working software.
• Participate in sprint ceremonies with the Scrum Master, delivering committed work reliably.

Skills

Full-stack development

AI/LLM integration

Cloud architecture (AWS/Azure)

Agile/Scrum

AI verification

Documentation

Cross-functional collaboration

Education

Bachelor's degree in Computer Science or related field

Tools

Veeva CRM

Salesforce Life Sciences Cloud

Salesforce Marketing Cloud

Job description

Pfizer Belgium is seeking a hands-on Senior Build Engineer to own end-to-end software delivery for the Medical Affairs AI Acceleration portfolio. You will write, test, and ship production-grade AI-enabled systems, turning prototypes into scalable solutions with strong verification of AI-generated code.

You will collaborate with Architecture, Data Integration, Product Management, and UX to deliver AI-powered platforms across the full stack, ensuring quality gates and maintainability in production.