Data Scientist - Machine Learning

TalentHawk; Greater London; Hybrid; GBP 60,000 - 100,000; Full time

Job summary

TalentHawk is seeking a proactive Data Scientist to join a London team 3 days a week, delivering ML and financial data insights. You will translate prototypes into automated pipelines that scale across large datasets, contributing to valuation accuracy.

You will design models (Random Forests / Boosted trees), build AWS-based data pipelines, quantify model confidence, and create human-in-the-loop feedback to continuously improve performance.

Qualifications

• 2–5 years in a quantitative or data science role focusing on ML.
• Strong mastery of Python and demonstrable experience deploying/monitoring models in an AWS production environment.
• Deep statistical understanding of ML techniques, including classification and optimisation.

Responsibilities

• Design, train, and validate ML models for valuations.
• Build production data pipelines in AWS (S3, Lambda) handling high volumes.
• Develop methods to measure model confidence and explain decisions.
• Implement continuous learning with human-in-the-loop feedback to improve accuracy.
• Collaborate with technical and business stakeholders to drive progress.

Skills

Python

AWS

Machine Learning

Education

Master's or PhD in a quantitative field (Statistics, Financial Engineering, CS, or Mathematics)

Tools

AWS Production Environments

Job description

Data Scientist | Machine Learning & Financial Engineering | Permanent | London 3 days a week | up to £100k per annum

Experience Level: 2+ Years Technical Stack: Python, AWS, Machine Learning

The Opportunity

We are seeking a proactive and analytically-driven Data Scientist to revolutionise the way our client process and validate complex financial data.

In this role, you will lead the transition from a manual, prototype-based cleaning process to a fully automated, scalable Machine Learning pipeline. You will be responsible for identifying outliers within large-scale datasets, ensuring the accuracy of consensus pricing for financial derivatives, and building a system that learns and improves through a continuous human-in-the-loop feedback mechanism.

Key Responsibilities

• Model Design & Development: Design, build, train, and validate sophisticated ML models (including Random Forests and Boosted models) to automatically flag "bad" valuations across multiple dimensions.
• Pipeline Automation (AWS): Build robust, production-ready data pipelines within the AWS ecosystem (S3, Lambda, etc.) to process high daily volumes of valuation data within tight windows.
• Explain ability & Confidence: Develop methods to measure model confidence and provide clear reasoning for valuation decisions. You will ensure the system flags borderline cases for expert review to maintain high integrity.
• Continuous Learning: Implement feedback loops where human corrections are automatically integrated into training data, allowing the model to evolve and improve accuracy over time.
• Collaborative Innovation: Generate and test hypotheses to drive incremental progress, working closely with both technical teams and business stakeholders.

Required Skills & Experience

• Commercial Experience: 2–5 years in a quantitative or data science role. Focus on Machine learning during this period
• Technical Proficiency: Strong mastery of Python and demonstrable experience deploying/monitoring models in an AWS production environment.
• ML Expertise: Deep statistical understanding of machine learning techniques, specifically classification and optimisation techniques to manage trade-offs between related data points.
• Analytical Mindset: Proven ability to surface features that drive decisions even when they are not directly observable from raw training data.
• Communication: Ability to collaborate across technical and business functions, with the potential to grow into a client-facing capacity.

Preferred Qualifications

• Education: Masters or Ph.D. in a highly quantitative field (Statistics, Financial Engineering, Computer Science, or Mathematics).
• Industry Background: Any industry is considered but financial services would be a plus