Principal Data Scientist

As a Principal Data Scientist, you will hold a combined project leadership and hands-on technical role. Working to develop LLM-powered automation tools for clinical reporting and document generation workflows., * Develop LLM-powered automation tools for clinical reporting and document generation workflows

• Build AI-driven code generation pipelines and quality assessment frameworks
• Design and implement human-in-the-loop review workflows with feedback loops to continuously improve output quality
• Design and build multi-agent systems for data workflows - agents that retrieve, generate, validate, and iterate autonomously
• Implement agent orchestration using frameworks such as Google ADK, LangGraph, or LangChain
• Deploy and manage agents on Google Vertex AI
• Use AI coding tools (e.g. Gemini CLI, GitHub Copilot) as a core part of your development workflow
• Critically review and validate AI-generated code - understanding what it produces, why, and when it's wrong
• Write effective prompts to direct AI tools toward correct, secure, well-structured output
• Know when to use AI and when to write code manually

• Strong Python skills
• Hands-on experience building RAG systems or LLM-powered applications (using LangChain, LlamaIndex, or similar frameworks)
• Experience integrating LLM APIs (Google Gemini, OpenAI, or similar) - we work primarily through Google Vertex AI
• Working knowledge of vector databases (ChromaDB, Weaviate, Qdrant, Pinecone, or similar)
• Docker and containerized deployments
• Comfortable using AI-assisted development tools (e.g. Gemini CLI, GitHub Copilot) - and critically evaluating what they produce

Phastar is an award-winning biometrics and data science CRO, trusted by pharma, biotech, and medical device companies worldwide. With a global team of data specialists, we bring expertise, precision, and pace to every trial, because behind every data point is a patient waiting for treatment. We transform complex data into clear, actionable intelligence, helping accelerate drug development, and bring life-changing therapies to patients faster. Awards & Recognition * SCRIP - Best Contract Research Organization, Specialist Provider * Citeline - 2025 Award Winner * Fierce CRO Awards - Recognized Industry Leader Apply Now Be part of a team known for technical expertise, quality, and impact. We value Excellence, Collaboration, Integrity, Innovation, and Passion-and we seek team members who embody these qualities. Apply today! Phastar is committed to the principles and practices of equal opportunities and to encourage the establishment of a diverse workforce. It is our policy to employ individuals on the basis of their suitability for the work to be performed and their potential for development, regardless of age, sex, race, color, nationality, ethnic or national origin, disability, marital status, pregnancy or maternity, sexual orientation, gender reassignment, religion, or belief. This includes creating a culture that fully reflects our commitment to equal opportunities for all. Important notice to Employment businesses/Agencies Phastar does not accept referrals from employment businesses and/or employment agencies in respect of the vacancies posted on this site. All employment businesses/agencies are required to contact Phastar's Head of Talent Acquisition to obtain prior written authorization before referring any candidates to Phastar. The obtaining of prior written authorization is a condition precedent to any agreement (verbal or written) between the employment business/ agency and Phastar. In the absence of such written authorization being obtained any actions undertaken by the employment business/agency shall be deemed to have been performed without the consent or contractual agreement of Phastar. Phastar shall therefore not be liable for any fees arising from such actions or any fees arising from any referrals by employment businesses/agencies in respect of the vacancies posted on this site. Company PHASTAR is a specialist biometrics contract research organization offering statistical consulting, clinical trial reporting, data management and data science services by providing expert consultants and managing and delivering in-house projects, FSP-style arrangements and preferred partnerships. Our number one priority is ensuring on time, quality work: every project undertaken is supervised on methodology and utilizes internal processes designed to guarantee optimal quality, inspired by 4,000 years accumulated technical experience across the company. PHASTAR is headquartered in London (UK) and North Carolina (US) and has 15 offices worldwide