Lead Data Scientist - Professional Services

eFinancialCareers; City Of London; On-site; GBP 120,000 - 170,000; Full time

Job summary

twentyAI, in partnership with a leading global professional services firm, is seeking a Lead Data Scientist to spearhead AI, NLP, and Generative AI initiatives in the legal sector. You will design, develop, and deploy modern AI systems, leading a small team while remaining hands-on in model development and production workflows.

You will collaborate with engineering, legal, and business stakeholders to deliver impactful AI products, mentoring team members and advancing best practices across the

Qualifications

• Experience delivering Data Science and AI solutions in production environments.
• Expertise in NLP, Generative AI, LLMs, and modern ML techniques.
• Advanced Python skills with PyTorch, TensorFlow, and SpaCy.
• Experience building scalable AI solutions in enterprise or regulated environments.
• Leadership experience mentoring a small team of Data Scientists.

Responsibilities

• Lead delivery of AI, NLP, and GenAI initiatives across business functions.
• Develop solutions using LLMs, semantic search, RAG pipelines, and deep learning models.
• Build scalable Python-based data and NLP pipelines for structured and unstructured content.
• Partner with engineering, legal, and business teams to deliver impactful AI products.
• Mentor data scientists and drive technical best practices across the team.

Skills

NLP

GenAI

LLMs

Python

PyTorch

TensorFlow

SpaCy

Leadership

Stakeholder mgmt

Tools

PyTorch

TensorFlow

SpaCy

Job description

twentyAI are partnering with a leading global professional service firm at the forefront of innovation, AI adoption, and digital transformation within the legal sector. Recognized for its collaborative culture, inclusive environment, and commitment to continuous learning, the firm combines world-class legal expertise with cutting‑edge technology to deliver exceptional client outcomes.

The role

The company are looking for an experiencedLead Data Scientist to lead the development of advanced AI, NLP, and Generative AI solutions that are transforming how legal services are delivered.

In this role, you will drive high-impact initiatives across ML, AI, and intelligent document processing, helping unlock insights from vast volumes of structured and unstructured legal data. You'll lead a team of data scientists while remaining hands‑on in the design, development, and deployment of modern AI systems.

Responsibilities

1. Lead delivery of AI, NLP, and GenAI initiatives across business functions.
2. Develop solutions using LLMs, semantic search, RAG pipelines, and deep learning models.
3. Build scalable Python-based data and NLP pipelines for structured and unstructured content.
4. Partner with engineering, legal, and business teams to deliver impactful AI products.
5. Mentor data scientists and drive technical best practices across the team.

Requirements

1. Strong experience delivering Data Science and AI solutions in production environments.
2. Expertise in NLP, Generative AI, LLMs, and modern machine learning techniques.
3. Advanced Python skills with experience using frameworks such as PyTorch, TensorFlow, and SpaCy.
4. Experience building scalable AI solutions within enterprise or regulated environments.
5. Leadership experience managing and mentoring a small team of Data Scientists
6. Excellent stakeholder management skills and ability to present to non-technical stakeholders.
7. Professional services or regulated background will be a plus.