Lead / Principal Consultant (AI & Data Science)

I'm hiring multiple senior hires to join a growing AI and Digital Transformation consulting practice within a premium consultancy. This team has recently secured significant investment and is scaling quickly, with multiple hires across Lead and Principal level.

This is a role for people who want to own and deliver real AI transformation, not just advise on it.

The company

A high-end consultancy working across defence, consumer, and public sector clients, known for delivering complex, high-impact programmes.

They've built a strong reputation on delivering measurable commercial outcomes, not just strategy - and are now investing heavily in expanding their AI capability to stay ahead of competitors.

Where you fit

You'll sit within the Digital / AI Consulting practice, working directly with clients to:

  • Identify opportunities for AI and advanced analytics
  • Design and deliver solutions end-to-end
  • Embed those solutions into real business operations

This is a hands-on leadership role - combining delivery, client engagement, and mentorship of other consultants.

What you'll be doing
  • Lead the design and delivery of AI and data science solutions (LLMs, NLP, ML, etc.)
  • Work directly with senior client stakeholders to shape and deliver solutions
  • Build and deploy end-to-end AI products, not just prototypes
  • Apply technologies such as LLMs, RAG systems, and agentic workflows to real business problems
  • Translate technical outputs into clear commercial value and measurable impact
  • Mentor and develop consultants, helping build capability across the team
  • Help shape the consultancy's AI offering and go-to-market approach
Example work
  • Using LLMs to improve decision-making and workflow automation in complex environments
  • Delivering predictive analytics in healthcare to improve outcomes and efficiency
  • Building AI-driven optimisation tools in retail to improve pricing and margins
  • Supporting large-scale programmes across defence and public infrastructure
What you bring Core requirements
  • Strong data science / machine learning background
  • Experience delivering AI / GenAI solutions (LLMs, NLP, etc.)
  • Proven ability to take solutions from concept through to real-world deployment
  • Experience leading projects, workstreams, or teams
  • Strong stakeholder engagement skills - client-facing and commercially focused
  • Evidence of measurable impact (revenue uplift, cost savings, efficiency gains, etc.)
Nice to have
  • Consulting experience (highly preferred)
  • Experience across regulated or complex sectors (defence, public sector, retail, etc.)
  • Familiarity with modern stacks (Python, cloud, Databricks, APIs, etc.)
  • Experience mentoring or leading junior team members
Why this role
  • Shape and scale a growing AI consulting capability
  • Work on complex, high-impact projects across multiple industries
  • Strong blend of technical delivery, commercial impact, and leadership
  • High visibility internally and with clients
  • Opportunity to progress to partner level over time
Working style
  • London base (or nearest office)
  • Hybrid working, with regular client travel
  • 3 days total per week
  • Flexible, project-led environment
Interview process
  • Online assessment (incl. logical / aptitude test)
  • Informal first conversation (director-level, including short presentation)
  • Final stage onsite in London (presentation + discussion)

Job Details

Company
Harnham - Data & Analytics Recruitment
Location
London, South East, England, United Kingdom
Hybrid / Remote Options
Employment Type
Full-Time
Salary
£90,000 - £125,000 per annum
Posted