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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 OpportunityThe 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.
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.
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, to allow you the flexibility to decide how, where and when you do your best work
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
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.
Skills Required
- Strong proficiency in Python for production-ready delivery
- Expertise in at least one AI or machine learning area, such as information retrieval, entity resolution, knowledge graphs, recommendation systems, tabular machine learning, statistical modeling, or generative AI
- Familiarity with additional AI and machine learning areas listed in the description
- Experience with the full model lifecycle, including experimentation, training, testing, monitoring, and deployment
- Strong product focus and ability to understand end-to-end user impact
- Good knowledge of AWS AI infrastructure
9fin Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about 9fin and has not been reviewed or approved by 9fin.
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Healthcare Strength — Pay and benefits are presented as including comprehensive medical, dental, and vision coverage, with life, disability, and FSA/HSA options also listed. Built In’s profile additionally describes “100% coverage” for certain health categories, which signals a robust health offering pending plan-detail confirmation.
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Leave & Time Off Breadth — Time off is positioned as generous, including 25 PTO days plus public holidays, paid sick time, and a one-month paid sabbatical after five years. The package is also framed as including a work-from-anywhere allowance in some locations, strengthening the perceived total rewards beyond base pay.
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Parental & Family Support — Parental leave is described as enhanced, with 22 weeks at full pay for birthing parents and 12 weeks at full pay for non-birthing parents. These policies are repeatedly highlighted as a standout element of the overall benefits package.
9fin Insights
What We Do
9fin is the AI-native platform for credit markets. We’re building the data and AI infrastructure behind an essential part of the global economy, one that funds governments, businesses and infrastructure, and keeps capital flowing around the world. By bringing together proprietary data, market intelligence and AI, we give leading financial institutions a complete view of credit and the tools to reduce risk, move faster and make better decisions. More than 350 of the world’s leading credit teams use 9fin, including all of the top 10 investment banks, 80% of trading desks, and asset managers overseeing a combined $17 trillion in AUM. Backed by more than $250 million in funding and valued at $1.3 billion, 9fin is expanding globally, moving deeper across public and private markets, and putting AI into the hands of the world’s most sophisticated credit teams. We’re scaling fast, but we’re nowhere near done. This is the stage where you can genuinely shape what 9fin becomes. You’ll get real ownership, tackle problems that haven’t been solved before, and share in the value you help create. We’re building toward a single goal: becoming the #1 global provider of AI, data, and analytics for the debt capital markets — this decade! If you want to work on meaningful problems at real scale, there’s plenty to do here. We'd love for you to build with us.
Why Work With Us
We're a team with a variety of professional and personal backgrounds. This affords us the opportunity to see things from many different angles. With space to both think deeply but also act quickly, responsibility and flexibility are abundant in equal measures at 9fin.
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