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Senior Software Engineer (Agent Training and Evals)
This is the employer's own posting, not a copy on a job board.
What we know
Is it still open?
Confirmed still open
Last checked 1d ago — checked against the employer's own applicant tracking system, which is the company answering directly.
We re-read the employer's own applicant tracking system and the posting was still there. That is the company answering directly.
How old is it?
Posted 20d ago
The date the source published, not the day we noticed it (2026-09-11). Last seen at its source 1h ago.
We have tracked this listing since 11 Sep 2026 (20 days). The employer's own board has carried it every time we have read it, most recently 1 hour ago.
Is it remote?
Remote, UK
That is the location the employer filed this posting under. Quoted as written — we do not re-word the source's own location.
Who may apply?
United Kingdom
The description states no restriction of its own. This is the source's own tag.
Pay not stated
Similar roles pay £75k–109.9k/yr
Middle 50% of 21 listings that do state pay — Engineering · Senior · United Kingdom · GBP/year. This employer has published no salary; this is what comparable listings we hold disclose, never converted between currencies or periods. How this is calculated.
Skills named in the ad
Recognised terms only, from a fixed vocabulary — this is what CV matching compares against.
Carried by 1 source
-
greenhouse employer's own board first seen 20d ago · last seen 1h ago
The listing
Senior Software Engineer - (Agent Training and Evals)
Engineering
Prolific
Prolific is not just another player in the AI space – we are the architects of the human data infrastructure that's reshaping the landscape of AI development. In a world where foundational AI technologies are increasingly commoditized, it's the quality and diversity of human-generated data that truly differentiates products and models.
The role
- As a Senior Software Engineer, you'll be one of the first engineers on our Agent Training & Evals team.
- You'll build infrastructure to evaluate AI agents at scale against real human expertise, in safe and secure environments. The better we get at this, the more useful, reliable and safe agents become.
- This is a genuine 0→1 role. There isn't a well-established playbook or existing architecture for you to simply maintain. You’ll shape the team’s technical direction and the products we build.
- You'll work closely with engineering, product and AI research to turn ambiguous problems into scalable systems, and you'll see the impact of what you build directly.
What you’ll be doing in the role
- Build a platform to support evaluating and fine-tuning agents
- Take prototypes to production; turn experiments and research ideas into reliable, well-tested software
- Own what we ship as it scales in production
- Solve hard problems around data, compute, orchestration, scaling, security and reliability
- Work with emerging agentic AI technologies and rapidly evolving models
- Make effective product and technical decisions in a highly experimental environment
- Partner closely with customers, product engineering and AI research to turn problems and opportunities into working products
- Drive direct impact in a fast-moving, high-ownership, cross-functional team
What you’ll bring to the role
- A background in Software Engineering, Data Engineering or MLOps
- Strong experience building scalable infrastructure or distributed systems in the cloud
- Solid understanding of how systems are deployed, scaled and secured
- Experience applying good engineering practice and raising the bar for those around you
- Hands-on experience with integrating and evaluating AI models or agents
- Interest in how AI agents are trained, evaluated and improved
- A product mindset with a focus on delivering business and customer value
- Comfort with ambiguity, and the ability to move quickly from idea to working system
- Python experience is useful but not essential
Key Technologies
- Cloud Platforms: Google Cloud Platform
- Programming Languages: Python, JavaScript, and TypeScript
- Frameworks: FastAPI, Vue.js, Container-based and Serverless architectures
- Databases: PostGres SQL
- DevOps and Monitoring: GitHub Actions, Kubernetes, Datadog, Langfuse
Why Prolific is a great place to work
We've built a unique platform that connects researchers and companies with a global pool of participants, enabling the collection of high-quality, ethically sourced human behavioral data and feedback. This data is the cornerstone of developing more accurate, nuanced, and aligned AI systems.
We believe that the next leap in AI capabilities won't come solely from scaling existing models, but from integrating diverse human perspectives and behaviors into AI development. By providing this crucial human data infrastructure, Prolific is positioning itself at the forefront of the next wave of AI innovation – one that reflects the breadth and the best of humanity.
Working for us will place you at the forefront of AI innovation, providing access to our unique human data platform and opportunities for groundbreaking research. Join us to enjoy a competitive salary, benefits, and remote working within our impactful, mission-driven culture.
Links to more information on Prolific
Privacy Statement
By submitting your application, you agree that Prolific may collect your personal data for recruiting and global organisation planning. Prolific's Candidate Privacy Notice explains what personal information Prolific may process, where Prolific may process your personal information, its purposes for processing your personal information, and the rights you can exercise over Prolific use of your personal information.