Senior Product Engineer (Agent Training and Evals)

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.

As a Senior Product Engineer, you'll be one of the early engineers in our Agentic Training & Evals team. You'll build the infrastructure that lets us evaluate AI agents, alongside real human expert work in safe and secure environments. This is a genuine 0→1 role. There isn't a well-established playbook or existing architecture for you to simply maintain. You'll have significant influence and ownership over the technical direction of the team 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 bring to the role:

• Strong experience building scalable infrastructure or distributed systems in the cloud
• Solid understanding of how systems are deployed, scaled and secured
• Hands-on experience with evaluating AI models or agents
• Interest in how AI agents are trained, evaluated and improved
• Bonus: experience with image, video, or audio processing
• Strong 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
• Strong communication and collaboration skills
• Python experience is useful, but not essential

What you’ll be doing in the role:

• Solve hard problems around compute, orchestration, scaling, security and reliability
• Help develop approaches for training, benchmarking and evaluating AI agents
• Work with emerging agentic AI technologies and rapidly evolving models
• Make pragmatic technical decisions in a highly ambiguous environment
• Partner closely with product engineering and AI research to turn customer problems into working products
• Drive direct impact in a fast-moving, high-ownership, cross-functional team

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

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.

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