Senior AI Engineer

Job Title: Senior AI Engineer Company: 9fin Job Category: Machine Learning Roles & Responsibilities: 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. Every day is different, but here's an example of the kind of things you'll work on: * 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. We want you to help lead/push the adoption of AI throughout 9fin. About You This role will be a great fit if you: Training \& Culture * 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 Hybrid Policy 9fin is a hybrid company, and the office is a regular part of how we work. From January 2027, all employees will work from their designated 9fin office on Tuesdays and Wednesdays. Some teams may be asked to be in the office more often, where the nature of their work calls for it. For the rest of the week, you may work from wherever works best for you and your team. Your Talent Partner will share hybrid working details for this role. Work Location: London, England, UK Availability: Full time

* Strong proficiency in Python for production ready delivery. * You’re an expert in any of the following areas \- deep expertise in one and familiarity with others is ideal: + Information Retrieval: chunking strategies, (finetuning) embedding models, training re\-rankers. + Entity/relationship extraction/resolution + Knowledge Graphs; building and inference, graphRAG + Recommendation systems and ranking: personalisation, learning\-to\-rank, feed ranking, user modelling, etc. + Tabular ML: feature engineering, structured data modelling (GBDTs, etc.) + Statistical \& Predictive Modelling: supervised ML, anomaly detection, temporal modelling, etc. + Deep understanding of the GenAI landscape and agentic frameworks. Benefits We’re a scaling start up, and we enjoy sharing our success, when the company succeeds, we always reinvest that in our people. We also offer huge amounts of responsibility, an abundance of opportunity for growth and a platform to truly excel. Financial \& Insurance * Competitive Salary (our salary bands are benchmarked at the top end of the market) * Equity * 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 Key Skills: Machine Learning, Python, Feature Engineering, Computer Vision Salary: $145