Senior AI and Machine Learning Scientist in London

9fin is the AI platform powering global debt markets — the world’s largest asset class at over $145 trillion. Debt markets are vast, global, and mission-critical, yet still run on fragmented data, PDFs, and manual workflows. 9fin replaces this broken infrastructure with a single platform that centralises proprietary credit data, deep analysis, and high-value workflows across global markets.

Today, 9fin powers teams at 300+ blue-chip institutions worldwide, including global banks, asset managers, private equity firms, law firms, and advisors. The business is scaling at exceptional speed, with rapid expansion in the US and best-in-class retention driven by deep workflow adoption. With proven product-market fit and strong, global market pull, 9fin is accelerating toward becoming the category-defining platform for debt markets worldwide.

The Data Science team is growing at 9fin! We are doing world-class work with groundbreaking technologies to build data-driven products using machine learning, computer vision, natural language processing, speech and audio, and knowledge/data mining. We are looking for a Senior AI Engineer to accelerate our application of AI across teams and products. Come and join us, you will get to build large-scale AI powered systems, learn and apply the latest techniques, and work alongside other great researchers and engineers!

Responsibilities include:

• Design and build generative AI applications tailored to complex financial and legal workflows, leveraging state-of-the-art models to deliver innovative, practical solutions that streamline decision-making and unlock new efficiencies.
• Drive end to end model development lifecycle, leading the team in best practices, ensuring reproducible research and well managed model delivery/deployment.
• Help lead/push the adoption of AI throughout 9fin.
• Build systems of persistent knowledge: representing entities, relationships, and events that evolve over time.
• Create and maintain the knowledge graph that powers intelligence, discovery, and workflow automation across the platform.
• Model complex domains as interconnected graphs, covering companies, sponsors, lenders, law firms, financial instruments, transactions, documents, events, and their relationships.
• Entity Resolution & Canonical Data Modelling: Strong experience with identity resolution, record linkage, alias handling, and entity disambiguation across fragmented and noisy financial datasets.
• Extract structured entities, events, and relationships from unstructured sources such as filings, legal documents, news, transcripts, and research content.
• Build graph-native retrieval and exploration capabilities that surface relationships, ownership structures, transaction histories, and connected entities.
• Design systems that identify comparable companies, relevant precedents, analogous situations, and related transactions using both graph structure and content signals.
• Graph Machine Learning: Familiarity with graph embeddings, node similarity, clustering, community detection, link prediction, and relationship scoring techniques.
• Production Data & Platform Engineering: Experience building and operating entity stores, graph pipelines, knowledge infrastructure, and low-latency serving systems at production scale.
• Strong proficiency in Python for production ready delivery.
• Experience working in the full model lifecycle (including experimentation, training, testing, monitoring, and deployment).
• Good knowledge of AWS’s AI infrastructure.

We also offer huge amounts of responsibility, an abundance of opportunity for growth and a platform to truly excel.

Financial & Insurance benefits include:

• Competitive Salary (our salary bands are benchmarked at the top end of the market)
• Pension (your minimum contributions are 4% with 9fin matching up to 7%)
• Private Medical Insurance
• Paid sick leave with Income Protection for long periods of illness
• Group Life Assurance
• Season Ticket Loan & Cycle to Work schemes
• 25 holiday days per year
• Local public holidays (with the ability to exchange them for alternative days)
• Hybrid working model, to allow you the flexibility to decide how, where and when you do your best work
• 1 month paid sabbatical after 5 years of service
• Enhanced parental leave & flexible working arrangements available

Training & Culture:

• Professional learning and development budget
• AI experimentation budget of £800 (UK) per employee to trial AI tools
• Summer and Winter company social events

At 9fin we are dedicated to building and promoting a fair and inclusive workplace where everyone can reach their full potential and truly belong. We recognize that building diverse teams enables a more creative and productive environment.