AI Engineer

Make Harold smarter. Ship the intelligence layer. Work at the frontier.

About The Role

Harold

runs on AI. Not as a gimmick but as the actual product. Every appraisal, every verdict, every insight Harold surfaces is powered by an AI pipeline that we are building in real time. We need someone who lives and breathes this stuff to help us build it properly.

You will work directly with the CTO on the AI layer that makes Harold genuinely intelligent — the models, the pipelines, the prompts, the evals, the infrastructure that turns raw deal data into the smartest analysis in the room.

What you’ll be doing

Design, build, and improve the AI pipelines that power Harold's core intelligence

• Own prompt engineering, model selection, evaluation, and continuous improvement
• Build agentic workflows that make Harold proactively useful — not just reactive
• Integrate new models, APIs, and tools as the landscape moves — and it moves fast
• Work end to end from the model layer to the product surface where users see the output

About You

You are obsessed with what LLMs can actually do and you push them further than most people think possible

• You have built AI-powered products or pipelines before — not just called the OpenAI API once
• You follow the frontier closely — new models, new techniques, new papers — and you apply it fast
• You write clean code but you know that shipping beats perfection every time
• You are as comfortable in a system prompt as you are in a codebase
• You want to work somewhere your AI work actually matters and reaches real users

Benefits

Equity and token allocation - be part of what Harold becomes

• Direct collaboration with the CTO on the most interesting AI problems in property tech
• Access to the full model stack - Anthropic, OpenAI, whatever the best tool is
• Remote-flexible with a London base
• Responsibility and ownership from day one. No junior queues, no PR approval chains
• A product that enterprise clients actually depend on

Apply now