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Principal Software Engineer, GPS

Scale AI · London, UK

Posted Nov 5, 2026

Est. total comp~$153K–$242K

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From the posting

Principal Software Engineer, Global Public Sector

Scale’s rapidly growing Global Public Sector team is focused on using AI to address critical challenges facing the public sector around the world. Our core work consists of:

Creating custom AI applications that will impact millions of citizens

Generating high-quality training data for national LLMs

Upskilling and advisory services to spread the impact of AI

We are hiring a Principal Engineer to join a small team of our most senior engineers who take on the problems no one else can. You will work at the earliest stage of our engagements: shaping the technical approach with clients, defining the technology we build on, and turning ideas into working prototypes fast. You will step in when a project is stuck or a problem is unusually hard, and turn what you learn in the field into shared capabilities every team can build on.

This is a very senior, hands-on role. Our engineering organisation is young, so mentoring is a core part of the job: you will raise the bar for how we design, build and deliver, and grow the next generation of technical leaders around you. The role is based in London.

At Scale, we’re not just building AI solutions, we are building repeatable blocks to enable the public sector to transform their operations and better serve citizens through cutting-edge technology. …

Excerpt from Scale AI's public job board. Read the full posting.

Job inventory

Required 9 items

  • 10y
  • 5y

Education: Bachelor's degree in Computer Science, Mathematics or a related field (or 4+ years of related experience)

Experience: 10+ years of experience in engineering, 5+ years of experience in applying AI/ML in production environments

Skills and tools: Python, JavaScript, Java, C++, AWS, Azure

Preferred 2 items

Skills and tools: TypeScript

Clearance and work authorization: UK government security clearance

Also in the posting: on-site; travel to client sites

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About this listing. Pulled automatically from Scale AI's public job board and refreshed daily; closed roles are removed. Mars Mining Co. is not the employer, does not take applications and does not screen candidates. Field and level labels come from the job title and can be wrong.

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About the pay figures (~): These are estimates. Yearly figures are estimated total comp ranges: the employer's posted pay range, or, with no posted pay, the median to 90th-percentile BLS wage for similar jobs, plus typical benefits and bonus, without stock. Hourly figures for internships and contract roles are posted rates or BLS hourly wage ranges. Figures outside the U.S. and for loosely matched titles are rough ballparks. How we estimate