9fin
Senior AI Engineer - LLMs and Finetuning
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Senior AI Engineer - LLMs and Finetuning
Join 9fin as a Senior AI Engineer
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
- 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 processing
- 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:
- Build large-scale AI-powered systems
- Learn and apply the latest techniques
- Work alongside great researchers and engineers
Your days will be diverse and challenging, but here's an example of your work:
- Design and build generative AI applications tailored to complex financial and legal workflows, leveraging state-of-the-art models.
- Drive end-to-end model development lifecycle, ensuring reproducible research and well-managed model delivery/deployment.
- Collaborate cross-functionally to share diverse ideas, understand business problems, and mentor teammates.
- Translate complex problems into scoped bets in a fast-paced, dynamic startup environment.
- Iterate improvements with a fail-fast mentality while staying abreast of ground-breaking research.
- Proactively share compelling ideas and work across 9fin to push AI adoption throughout the company.
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What Makes This Role Different
This role focuses on improving models themselves. While experience with retrieval systems, knowledge graphs, and AI applications is valuable, the core challenge is building proprietary financial-domain models that outperform general-purpose LLMs on the workflows that matter most to 9fin users.
About You
This role is a great fit if you have:
- Deep experience evaluating, adapting, and deploying open-weight models (e.g., Llama, Qwen, Mistral, Gemma) for production use cases.
- Expertise in:
- Supervised & preference fine-tuning
- Instruction tuning
- Domain adaptation
- Strong experience building:
- High-quality training datasets
- Synthetic training data feeds
- Data flywheels for continuous model improvements
- Ability to design rigorous benchmarks, evaluation frameworks, and regression testing systems for assessing real-world model performance.
- Domain expertise applying AI to complex financial and legal workflows, including:
- Credit, restructuring
- Debt instruments
- Filings, court documents
- Capital markets workflows
- Familiarity with:
- Distributed training
- Parameter-efficient tuning
- GPU optimization techniques
- Inference acceleration strategies
- Skills in:
- Model distillation & quantization
- Cost-performance trade-offs
- Full lifecycle of production ML engineering, including:
- Training pipelines
- Deployment & monitoring
- Strong Python proficiency for production-ready delivery.
- Product mindset with a focus on end-to-end business impact for end users.
- Deep knowledge of AWS’s AI infrastructure.
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Benefits
Financial & Insurance
- Competitive salary (salary bands benchmarked at the top end of the market)
- Equity
- Pension (your minimum contribution is 4% of salary, matched up to 7%)
- Private Medical Insurance
- Paid sick leave with Income Protection for long illness
- Group Life Assurance
- Season Ticket Loan & Cycle to Work schemes
Time off
- 25 holiday days per year
- Local public holidays (with ability to swap for alternative days)
- Hybrid working model – flexibility to choose how, where, and when you work best
- Travel abroad for up to 3 months per year
- 1-month paid sabbatical after 5 years of service
- Enhanced parental leave & flexible working arrangements
Training & Culture
- Professional learning & development budget
- AI experimentation budget of £800 (UK) per employee to try AI tools
- Quarterly team socials
- Summer/Winter company social events
Inclusivity
9fin is an equal opportunities employer. We foster a fair and inclusive workplace to empower everyone to achieve their potential.
Our teams thrive through diversity, and alternative experiences sometimes lead to unexpected yet meaningful contributions. If this role excites you but your background falls outside typical expectations, we encourage you to apply—we may find you a perfect match for this position, or another opportunity within the company.
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