Jan Keijzer

Independent consultant specialising in technical architecture and AI-powered system development.

• • Built open source developer tooling that automates AI-augmented development workflows

• • Built node-based AI workflow orchestration for automated content pipelines

• • Implemented prompt tracking and evaluation for monitoring AI output quality

• • Designed and built a full dating platform from scratch: FastAPI, PostgreSQL, Redis, Docker, AI-driven content moderation Stack: Python, FastAPI, LLM APIs, Pydantic, Docker, PostgreSQL, TypeScript, PHP, CI/CD

Joined as first software engineer on a 24/7 social alarm platform for life-critical healthcare situations. Together with the CTO, professionalised the product while it had to keep running around the clock.

• • Transformed an ad-hoc codebase into structured architecture with CI/CD and version control

• • Executed zero-downtime server migration without a single lost alarm

• • Scaled from hundreds to thousands of connected devices across multiple tenant organisations

• • Co-responsible for company growth from 6 to 50+ employees

• • Contributed to ISO certification process Tech: PHP, MySQL, Yii2, JavaScript, Docker, Jenkins, Linux

Tech lead on EU-funded healthcare innovation projects across multi-country consortia. Managed rotating development teams across international partners. Coordinated technical deliverables across organisations with different capabilities and priorities. Navigated the intersection of technology, healthcare regulation, and multi-stakeholder governance.