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Senior Data Scientist I at Elsevier, London Wall

Senior Data Scientist I at Elsevier in London Wall. Full-time. Est. up to $100k. Apply with swipeandhired.

Interested in building and shaping AI systems that combine machine learning, retrieval, and modern language models to solve real-world problems

About the team: You’ll work closely with engineering, product, and cross-functional partners to deliver robust, scalable solutions, while helping raise the technical bar across the team.

About the role : We’re looking for a Senior Data Scientist I to lead the design and development of intelligent, data-driven systems that help users explore, understand, and act on complex information.
In this role, you’ll take ownership of high-impact problem areas—driving solutions from concept to production while navigating ambiguity and making key technical decisions. You’ll combine strong machine learning foundations with modern AI approaches to build systems that integrate prediction, retrieval, and generation at scale.

What You’ll Do

Lead the design and development of machine learning and AI-powered systems for complex, real-world problems
Own end-to-end solutions—from problem framing and experimentation to production deployment and iteration
Drive technical direction for key problem areas, making informed trade-offs between modeling approaches, system design, and scalability
Apply a range of techniques—from classical ML to large language model (LLM) approaches—based on the problem context
Design systems that combine retrieval, ranking, and generation to enable intelligent workflows
Define and drive evaluation strategies, ensuring high-quality, reliable, and trustworthy outputs
Contribute to system architecture and scalability, working closely with engineering teams
Mentor and guide other data scientists, helping raise the overall technical bar of the team
Influence product direction by translating technical insights into actionable recommendations
Collaborate with product teams to design experiments, measure impact, and iterate based on evidence

What We’re Looking For
Core Qualifications

Significant experience in data science, machine learning, or a related field
Strong Python skills with a track record of building production-quality, maintainable systems
Deep understanding of machine learning fundamentals and experience applying them in real-world settings
Proven experience owning and delivering end-to-end data science or AI projects
Strong problem-solving skills and ability to navigate ambiguity
Ability to write clean, tested, well-documented code suitable for collaborative development
Experience working with cross-functional teams to deliver user-facing data or AI products

AI & Modern Techniques

Hands-on experience working with large language models (LLMs) in applied or production settings
Experience with retrieval-based approaches (e.g., embeddings, semantic search, ranking)
Experience building or contributing to LLM-powered systems involving multi-step reasoning, tool use, or workflow orchestration (e.g., agent-based approaches or frameworks such as LangChain, LangGraph, or similar)
Strong understanding of when to apply classical machine learning vs. LLM-based approaches

Data & Engineering

Experience working with large, complex, and unstructured datasets (especially text)
Familiarity with ML frameworks (e.g., PyTorch, TensorFlow, Scikit-learn, HuggingFace)
Experience with cloud platforms and modern development workflows (Git, CI/CD)
Ability to contribute to scalable system design and collaborate effectively with engineering teams
Experience with vector databases or search infrastructure such as Elasticsearch, OpenSearch, Qdrant or similar.

Collaboration & Leadership

Excellent communication skills with the ability to influence both technical and non-technical stakeholders
Ability to explain model behavior, trade-offs, and limitations clearly to non-technical audiences
Experience mentoring or supporting other team members
Ability to drive projects forward independently while aligning with broader team goals

Nice to Have

Experience with search, information retrieval, or knowledge systems at scale
Experience designing evaluation frameworks for AI-generated or retrieval-based outputs
Exposure to MLOps tools and practices (e.g., MLflow, Kubeflow, SageMaker)
Experience optimizing systems for performance, scalability, or cost
Familiarity with frameworks or tools for orchestrating LLM-based workflows and agent-like systems
Experience working in structured and reproducible development environments (e.g., clear specification of tasks, experiment tracking, and collaborative workflows)
Interest in emerging paradigms such as spec-driven or AI-assisted development
Experience with citation-aware, source-grounded, or evidence-based AI systems

Why Join Us

Lead work on impactful problems involving complex, real-world data
Build and shape systems that combine machine learning fundamentals with modern AI approaches
Collaborate with a team focused on quality, scalability, and meaningful outcomes
Opportunity to influence both technical direction and product evolution

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