Senior AI Engineer - Legal AI
Level inferred from job title
Job description
Senior AI Engineer on 9fin's Data Science team, building large-scale AI systems that convert complex financial and legal documents into structured, reliable data for debt markets.
At a glance
- Employment
- Full-time · Employee (employment agreement)
- Work mode
- Hybrid · 2 days/week in office · London, United Kingdom
What you'll do
- 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.
- Collaborate cross functionally to share diverse ideas, understand business problems, and elevate/mentor your teammates.
- Translate complex problems into well-defined scoped bets in an internal startup style environment, dynamic and fast-paced.
- Learn and apply ground-breaking research and approaches in advanced topics, iterating improvements with a fail fast mentality.
- Be a proactive sharer of compelling ideas/work to the rest of the team and organisation, helping lead/push the adoption of AI throughout 9fin.
What we're looking for
- Legal Document Intelligence: Deep experience working with complex legal and financial documents, including bond offering memoranda, credit agreements, indentures, court filings, and related transaction documentation.
- Information Extraction / Document Understanding & NLP: Strong understanding of document structure, section hierarchy, cross-references, defined terms, tables, exhibits, and other patterns common in legal and financial documentation.
- LLMs for Structured Extraction: Experience applying LLMs to high-precision extraction tasks, including schema-driven extraction, citation grounding, validation, and confidence scoring.
- Data Quality & Validation Systems: Ability to design review, verification, and reconciliation workflows that ensure extracted data is accurate, consistent, and auditable.
- Training Data & Annotation: Experience building labelled datasets, annotation frameworks, synthetic data generation, and evaluation sets for document extraction tasks.
- Retrieval & Context Engineering: Strong understanding of chunking, document segmentation, retrieval, and context construction for long-document reasoning and extraction workflows.
- Financial & Legal Domain Knowledge: Familiarity with leveraged finance, debt capital markets, credit agreements, covenant packages, bond documentation, restructuring processes, and related legal concepts.
- Production ML Engineering: Ability to build and operate extraction pipelines, evaluation systems, model-serving infrastructure, and monitoring for production AI workflows.
- Strong proficiency in Python for production ready delivery.
- Experience working in the full model lifecycle (including experimentation, training, testing, monitoring, and deployment).
- Strong product focus with a desire to understand the end-to-end impact of your solutions for our end users.
- Good knowledge of AWS's AI infrastructure.
Your team
Data Science team
Team 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.
Benefits
- Competitive Salary (salary bands benchmarked at the top end of the market)
- Equity
- Pension (minimum contributions 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)
- Work abroad for up to 3 months a year
- 1 month paid sabbatical after 5 years of service
- Enhanced parental leave & flexible working arrangements available
- Professional learning and development budget
- AI experimentation budget of £800 (UK) per employee to trial AI tools
- Quarterly team socials
- Summer and Winter company social events
Apply
About 9fin
The AI platform powering global debt markets
9fin is the AI platform powering global debt markets — the world's largest asset class at over $145 trillion. It replaces fragmented data, PDFs, and manual workflows with a single platform that centralises proprietary credit data, deep analysis, and high-value workflows across global markets.
Key facts
- Financial technology / debt markets data platform
- Powers teams at 300+ blue-chip institutions worldwide, including global banks, asset managers, private equity firms, law firms, and advisors
- Scaling at exceptional speed, with rapid expansion in the US and best-in-class retention driven by deep workflow adoption
- Hybrid company; from January 2027, all employees will work from their designated 9fin office on Tuesdays and Wednesdays
