Staff Software Engineer

Company: Harnham
Apply for the Staff Software Engineer
Location: London
Job Description:

Staff Engineer

London (Liverpool Street – 3x week) | £120,000 – £160,000 + benefits

This is a rare opportunity to shape the technical core of a fast-scaling data platform backed by private equity. You will work directly with the CTO to unify multiple data businesses into a single AI-native platform, combining hands-on engineering with strategic influence at board level. If you enjoy solving complex data challenges at scale and building from first principles, this role offers significant scope and impact.

The Company

They are a growing data platform business built through the acquisition of specialist data companies across multiple markets. Backed by a well-established private equity partner, they are scaling quickly and expanding their global footprint. Each business within the group brings unique datasets and capabilities, and the long-term vision is to unify these into one intelligent, AI-driven platform. The organisation combines technical ambition with a pragmatic, commercially focused approach to growth.

The Role

You will act as a technical partner to the CTO, helping to define and deliver a unified data platform across the group. This role blends hands-on engineering with leadership and strategic input.

  • Build and lead the development of a centralised, AI-native data platform
  • Design and implement scalable data systems, APIs, and integration layers
  • Lead technical due diligence and post-acquisition integration of new businesses
  • Establish AI engineering standards and best practices across the group
  • Develop and deploy AI-driven tools and agents to improve data quality and velocity
  • Contribute directly to production code while shaping platform architecture
  • Engage with senior stakeholders, including presenting technical strategy at board level
  • Support the gradual growth of a high-performing, small engineering team

Your Skills & Experience

  • Strong commercial experience building and scaling data platforms, APIs, or data products
  • Hands-on programming expertise with Python, SQL, and TypeScript
  • Ability to operate across both engineering delivery and high-level architecture
  • Experience working with large, complex datasets and data pipelines at scale
  • Comfortable navigating hybrid environments including cloud and on-premise systems
  • Strong communication skills, with the ability to engage technical and non-technical stakeholders
  • Commercial awareness and an understanding of how data products drive business value
  • Background as a senior individual contributor or technical leader in high-impact environments

What They Offer

  • Opportunity to work directly with senior leadership and influence business-critical decisions
  • Exposure to private equity-backed growth and acquisition strategy
  • Significant scope to build and shape a platform and team from an early stage
  • Benefits package to be confirmed

How to Apply

If you are interested in this opportunity, please submit your CV to discuss further

Posted: July 1st, 2026