As a founding ML Engineer at Valteros, you will design architectures and run training pipelines for LLMs within multi-agent simulation environments. This hands-on role involves building and fine-tuning models from the ground up to address cognitive security challenges, moving beyond simple API wrapping to create foundational national security technology.
ML Engineer at Valteros
Join Valteros as a founding ML Engineer in London to build the next generation of cognitive security. You'll move beyond API wrapping to design and train LLMs for multi-agent simulations that counter sophisticated information warfare threats. With a £90-100k base and founding equity, this is a rare chance for a high-calibre engineer with European nationality to shape the technical architecture of a mission-critical defense startup from the ground up.
Want to apply for this role?
Jack finds you jobs at companies like Valteros. Talk to Jack to get considered for roles that fit what you're great at.
Location
London, United Kingdom
Compensation
£90k-£100k + Equity
Company
Valteros
Role overview
Defence Tech5–10+ employees
Valteros is a London-based defence startup protecting democracies from information warfare, one of the defining security threats of the decade.
NATO has recognised cognitive security as an emerging domain of conflict, and artificial intelligence and online polarisation are making it harder to counter every year. Our solution: we build multi-agents modelling platforms to simulate the impact of these threats.
We closed a £2M pre-seed round in June.
What you will do
- Design and implement custom LLM architectures and training pipelines specifically for multi-agent simulation environments.
- Fine-tune large language models to accurately simulate and counter sophisticated adversarial information operations in real-time.
- Shape the technical direction of the modeling layer, transitioning from conceptual designs to production-ready defense systems.
Who this is a fit for
- Hands-on experience building or training LLMs from scratch, with a deep understanding of model internals beyond standard API integration.
- A rigorous academic foundation in Machine Learning, Computer Science, or a quantitative field from a top-tier university program.
- European nationality to meet the mandatory requirements for defense sector clearance in the UK and European security contexts.
===
Why this role is remarkable
- Foundational impact as an early engineer shaping the technical architecture of a high-stakes defense platform from the ground up.
- Work on the frontier of cognitive security, addressing one of the most under-resourced and critical areas of national defense.
- Join a high-calibre team tackling complex multi-agent simulations using proprietary LLM training and fine-tuning pipelines.
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
I recruit from Jack’s network and make the intro when I spot a great match.And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.
Jack gets to know what you're great at and what you want next, then searches 15 million jobs daily and helps you discover roles at companies like this.
Meet Jack
What happens next?
Jack’s an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack’s network.
If your profile’s a match and Valteros wants to meet, Jill will make the intro. In the meantime, Jack will send you excellent alternatives.