Senior Data Scientist - LLM/ML, Equity & FinTech

Moss; Greater London; Hybrid; GBP 110,000 - 160,000; Full time

Benefits offered by this job

Equity

Learning & Development budget

Work from abroad 20 days

Friday demos

Job summary

Moss is expanding its Data & AI team and seeks a senior/lead contributor with hands-on LLM app/agent experience. You will own end-to-end LLM/ML initiatives—framing problems, modeling, evaluating, deploying, and iterating to improve core workflows like invoice understanding and reconciliation.

You will work with Platform/Data Eng to productionize models, ensure monitoring and scalability, and drive impact across Moss’s fintech product suite. Equity is part of the compensation package.

Qualifications

• 5–10+ years in applied ML with production ownership of shipping models/systems.
• Hands-on LLM app/agent experience (tool use/function calling, RAG, structured outputs, guardrails) in production.
• Strong Python + ML stack (e.g., scikit-learn, XGBoost/LightGBM, PyTorch/TF) and solid experiment/evaluation skills.

Responsibilities

• Own LLM/ML pipelines for extraction, classification, anomaly detection, and recommendations.
• Define evaluation & monitoring: gold sets, automated tests, robustness checks, SLAs, and cost/latency tracking.
• Productionize with Platform/Data Eng: bring your models live and iterate/improve until they are adopted by your stakeholders

Skills

LLM apps/agents

Python

ML stack

Experimentation

Production ML

Problem framing

Tools

PyTorch

scikit-learn

XGBoost

LightGBM

Docker

Kubernetes

SQL

Job description

Moss is expanding its Data & AI team and seeks a senior/lead contributor with hands-on LLM app/agent experience. You will own end-to-end LLM/ML initiatives—framing problems, modeling, evaluating, deploying, and iterating to improve core workflows like invoice understanding and reconciliation.

You will work with Platform/Data Eng to productionize models, ensure monitoring and scalability, and drive impact across Moss’s fintech product suite. Equity is part of the compensation package.