GenAI Prototyping Specialist

Location:

Central London (Hybrid Onsite - Tuesday/Wednesday/Thursday)

We are looking for a GenAI Prototyping Specialist to be embedded within Fractal’s EMEIA team, focused 100% on new capability development. This is not a reporting or maintenance role – it is a fast‑paced, innovation‑first position where you will rapidly conceptualise, build, and iterate on proof‑of‑concept AI solutions using cutting‑edge LLM tooling.

• Rapidly concept, build, and iterate on proof‑of‑concept GenAI solutions, leveraging LLM tooling including Claude Code, client‑specific LLM platforms and tools.
• Generate and evaluate new POC ideas aligned with client priorities, identified in weekly sessions with the Fractal lead and client stakeholders.
• Progress high‑value POCs from initial concept through to business‑prototype stage, suitable for stakeholder demonstration.
• Apply product intuition to prioritise concepts with the highest business impact and scalability.
• Attend in‑person working sessions at the client’s London office on Tuesdays, Wednesdays, and Thursdays.
• Participate in daily/weekly sync sessions with the Fractal Engagement Manager, align on priorities, share progress, and incorporate feedback.
• Present prototypes and technical approaches to client stakeholders, articulating business value and technical underpinnings.
• Document prototypes, technical approaches, architectural decisions and outcomes in a form suitable for handoff into the client’s global product pipeline.
• Prepare a showcase deliverable for mid‑June 2026, presenting selected POCs to client stakeholders including global leadership.
• Create lightweight technical documentation enabling other engineers to understand, extend, or product ionise prototype solutions.

• 5+ years of professional experience in software engineering, ML engineering, or applied AI development.
• Strong proficiency in Python for rapid prototyping, data manipulation, API integration and ML model experimentation.
• Hands‑on experience with GenAI/LLM application development – prompt engineering, RAG architectures, tool use and agentic workflows.
• Experience using AI‑assisted coding tools such as Claude Code, Git Hub Copilot or Cursor.
• Working knowledge of ML fundamentals: classification, regression, clustering, NLP, embeddings and model evaluation.
• Ability to move from idea to working prototype quickly, comfortable with imperfect code and fast iteration.
• Strong communication skills – demo prototypes, explain technical concepts to non‑technical stakeholders, articulate the "so what" of each solution.
• Self‑directed and adaptable – comfortable working without detailed specifications in a fast‑changing environment.

• Experience with multiple LLM providers and platforms (Anthropic Claude, OpenAI, open‑source models via Hugging Face).
• Front‑end development familiarity (React, HTML/CSS, Streamlit, Gradio) for building interactive demo interfaces around AI prototypes.
• Experience with cloud AI services (Azure OpenAI, AWS Bedrock, GCP Vertex AI) for model hosting and API integration.
• Background in marketing technology, digital marketing or consumer‑facing product development.
• Embedded consulting or contractor experience within large enterprise environments.
• Familiarity with vector databases (Pinecone, Chroma
  
  DB, Weaviate) and semantic search architectures.
• Previous experience building and presenting POCs or demo prototypes to senior/executive stakeholders.
• Experience with multi‑agent frameworks (Lang Graph, Auto Gen, CrewAI) or workflow orchestration tools.

• Employment Type:
  
  Fractal FTE, embedded within the client’s EMEIA team at the client’s London office.
• Primary
  
  Location:
  
  Client office, Central London.
• In‑person days:
  Tuesday, Wednesday, Thursday each week.
• Remote days:
  Monday and Friday (flexible).

• Bachelor’s degree in Computer Science, Data Science, Machine Learning, Software Engineering or a related technical field.
• Master’s degree is a plus but not required.
• Self‑taught engineers with strong portfolios and proven prototyping ability are welcome.