Senior AI Engineer - Legal AI

Contract type
Ongoing
Work mode
Hybrid · 2 days/week in office · London, United Kingdom
Experience
Senior · Not stated

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