AI Engineer

General Description

Overview

Prolific is not just another player in the AI space – we are the architects of the human data infrastructure shaping AI development. In a world where foundational AI technologies are commoditized, the quality and diversity of human-generated data differentiates products and models. The future of AI development relies on high-quality human data, and Prolific provides the world\’s largest and most trusted source of this data to teams pushing the boundaries of AI technology. As an AI Engineer, you\’ll build intelligent systems powering the interface between humans and models, shaping how next-generation AI systems are trained, evaluated, and aligned. This is a unique opportunity to solve novel problems and have a foundational impact on the AI ecosystem, alongside a world-class team and leading AI labs.

What You\’ll Be Doing

• Architect & Build: Lead the design and implementation of production-grade AI systems that enhance how human feedback is collected, validated, and utilized across our platform.
• Solve Core Challenges: Develop systems for fraud detection, quality assurance, and intelligent participant-to-task matching using techniques like vector search and advanced profile representation.
• Innovate with LLMs: Create and deploy AI agents and systems with immediate product impact—from automated data tagging to LLM-based evaluation judges, including experimental ideas such as synthetic personas.
• Drive Technical Strategy: Provide technical leadership and mentorship on applying AI/LLM techniques, defining best practices for prompt engineering, fine-tuning, and RAG.
• Ensure Reliability: Implement and own LLM observability and evaluation systems to ensure our AI features are reliable, performant, and continually improving.
• Collaborate Cross-Functionally: Work with data scientists, platform engineers, and research teams to build cohesive, end-to-end solutions that push human-AI interaction boundaries.

Who We\’re Looking For

Core Requirements:

• A strong track record of designing, building, and shipping AI-powered features that solve real business problems.
• An inquisitive and experimental mindset, with a passion for tackling ambiguous problems that may not have established solutions.
• Deep practical knowledge of the modern AI engineering stack (e.g., RAG, vector databases, prompt engineering, fine-tuning techniques, and evaluation frameworks).
• The ability to balance cutting-edge research with practical constraints of production reliability and scalability.

Deep expertise in one or both of the following areas:

• Software Engineering & Systems Design: Python expertise and experience building scalable services (e.g., FastAPI, Django), strong system design, infrastructure, and CI/CD, with a track record from concept to deployment.
• Machine Learning Engineering & Research: Background in ML with experience in ML frameworks (e.g., PyTorch, TensorFlow, Hugging Face) and a solid grasp of the underlying theory behind models and techniques used.

Bonus Points:

• Experience with modern LLM orchestration frameworks (e.g., LangChain, LlamaIndex, DSPy, LangGraph).
• Experience in agentic system design and tool calling (Adk, A2A, MCP, etc.).
• Prior work on human-in-the-loop systems, data annotation platforms, or RLHF.
• Interest or experience in synthetic data, human-in-the-loop systems, or AI alignment.
• Experience building robust monitoring and observability for AI/ML systems in production.

Why Prolific is a Great Place to Work

We\’ve built a platform that connects researchers and companies with a global pool of participants, enabling high-quality, ethically sourced human behavioral data and feedback. This data is critical to developing more accurate, nuanced, and aligned AI systems. We believe the next leap in AI will come from integrating diverse human perspectives and behaviors into AI development. Prolific is positioned at the forefront of this next wave of AI innovation—one that reflects the breadth and best of humanity. Working with us offers a competitive salary, benefits, and remote work within a mission-driven culture.

Additional Information

Links to more information on Prolific

Benefits

External Handbook

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Privacy Statement

By submitting your application, you agree that Prolific may collect your personal data for recruiting and global organization planning. Prolific\’s Candidate Privacy Notice explains what personal information may be processed, where, purposes, and rights you can exercise over Prolific\’s use of your personal information.

Seniority level

• Mid-Senior level

Employment type

• Full-time

Job function

• Engineering and Information Technology

Industries

• Technology, Information and Internet

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