Senior AI Engineer
At a glance
Senior AI Engineering role at 9fin. London · full-time.
Pay not stated AI Engineer salary
aimlroles summary, based on the employer's posting.
What you'll do
- Build generative AI products for complex finance and legal workflows, helping users make decisions and work more efficiently
- Lead the model process from experiments through deployment, setting practices that make research reproducible and delivery well managed
- Work with colleagues across teams to understand business needs, share ideas and help teammates grow
- Turn difficult problems into clearly scoped projects, then test and refine new research approaches
- Share useful AI ideas across the team and help broaden adoption in products and teams
What you bring
- You deliver production-ready software with strong Python skills
- You bring deep expertise in at least one listed area, such as information retrieval, knowledge graphs or recommendation systems
- You understand generative AI and agent-based frameworks, and have worked across the model lifecycle from experiments to deployment
- You focus on product outcomes and understand how your work affects end users
- You know AWS tools for AI workloads
Who this fits
This senior role suits an engineer who combines hands-on AI development with technical leadership, product thinking and a willingness to mentor. The job is based in London and follows a hybrid schedule: from January 2027, office attendance is required on Tuesdays and Wednesdays, with additional days possible for some teams. You can work elsewhere during the rest of the week.
From the employer
About 9fin
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.
We’re at a defining inflection point. With proven product-market fit and strong, global market pull, 9fin is accelerating toward becoming the category-defining platform for debt markets worldwide.
The Opportunity
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!
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:
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.
Experience working in the full model lifecycle (including experimentation, training, testing, monitoring, and deployment). We are data centric and love our evals!
You have a 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.
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
Time off
25 holiday days per year
Local public holidays (with the ability to exchange them for alternative days)
Hybrid working model
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
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.
9fin is an equal opportunities employer
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. If you’re excited about this role but your experience doesn’t perfectly align with the job description, we encourage you to apply anyway. You might just be who we’re looking for — either for this role, or perhaps another.