AI/ML Engineer

Us

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.

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.

Our mission is to bridge the gap between AI potential and human insight. 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 breath and the best of humanity.

The Role

At Prolific, you'll build cutting-edge AI systems that enable leading AI companies to incorporate high-quality human feedback and data into their models. You'll architect the underlying intelligence that powers our human-in-the-loop platform, developing for both traditional ML models and modern AI systems that transform how the industry evaluates, aligns, and improves AI models and systems. You'll work across the full spectrum – from fraud detection algorithms to sophisticated representation systems – creating the technical foundation that makes human feedback actionable at scale. This role sits at the intersection of AI advancement and real-world application, giving you a direct impact on how the next generation of AI models evolve. WhatYou’ll Be DoingTechnical Leadership & Modelling

• Transform our existing models into robust, monitored systems
• Design and implement AI/ML systems that enhance how human feedback is collected, validated, and utilised
• Architect solutions that intelligently route tasks, detect quality issues, and optimise human-AI interactions
• Balance sophisticated technical approaches with practical business requirements

Infrastructure & Scalability

• Design and architect our AI/ML platform
• Implement AI/ML observability systems that ensure reliability and performance
• Develop reproducible training and deployment pipelines that scale with our business
• Establish data-centric AI practices that leverage our unique position in the human data ecosystem
• Drive technical standards and best practices across our AI engineering work
• Collaborate with data scientists, platform engineers, and research teams to build cohesive solutions

What You’ll Bring

• Strong track record implementing AI/ML systems that solved real business problems
• Skills in both building models and creating the infrastructure that supports them
• Proven expertise in modern AI/ML engineering practices and technologies, e.g. LLMOps or agentic AI
• Strong software engineering fundamentals with expertise in Python, AI/ML frameworks, and cloud infrastructure
• Experience mentoring teams and influencing AI/ML strategy
• Track record of improving AI/ML systems through better engineering practices
• Ability to balance cutting-edge approaches with production reliability
• Passion for improving how AI systems learn from and interact with humans Experience with human-in-the-loop systems, synthetic data, or AI alignment a plus

Interview Process

• **Talent Call -**You'll meet with one of our Talent team and have an exploratory call about the role requirements, life at Prolific, as well as your background and aspirations.
• **Hiring Manager Interview -**You'll interview with two members of the team, one of which will be the hiring manager. You'll have the opportunity to ask about the company and the role, and we'll ask you questions about your experiences and goals.
• **Panel Interview -**We'll hold a panel interview that evaluates skills required for the role. You'll meet with more of our team and may be asked to complete a presentation or task. You'll be compensated with a £50 voucher 💰 for completing the task because we know your time is valuable!
• **Final Interview -**We will deep dive into your past experiences, goals, motivations, and skills all aligned to our Prolific Principles. You'll speak with two to three members of the team and - as always - have an opportunity to ask questions about the role and company.