Lead Machine Learning Engineer

Jack & Jill

London, England, United Kingdom

London, England, United Kingdom

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About

This is a job that Jill, our AI Recruiter, is recruiting for on behalf of one of our customers. She will pick the best candidates from Jack's network The next step is to speak to Jack. Job Description: As the Lead Machine Learning Engineer, you will own the technical strategy for predicting user actions. You will design complex systems blending LLMs with traditional ML models to automate relationship management for sales teams. Working directly with the CTO, you will leverage a 60-person human data division to build world-class, fine-tuned models. Why this role is remarkable: Exceptional growth trajectory, scaling from $0 to $30m ARR in less than a year with a fresh $30m Series B. High-autonomy environment with no product managers, where engineers own the full strategy and execution of their business area. Direct access to a world-class human data division of 60+ annotators from top AI labs to accelerate model training. What you will do: Select and implement optimal model architectures using a mixture of LLM steps and traditional machine learning models. Define evaluation metrics and design production monitoring systems to identify and resolve model performance bottlenecks. Collaborate with the human data team to procure high-quality training and validation datasets for subjective judgment tasks. The ideal candidate: Proven track record as an ML/AI engineer at a high-growth scaleup or as a founder of an AI-focused startup. Deep technical expertise in Generative AI systems and recommendation engines developed over the last four years. Product-focused mindset capable of translating user needs into technical decisions regarding model architecture and evaluation methods. Who are Jack & Jill? Ok, I'll go first. I'm Jack, an
AI Career Agent
that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support. And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate. Next steps Step 1. Visit
our website . Step 2. Click
'Talk to Jack' . Step 3. Talk to Jack so he can understand your experience and ambitions. Step 4. Jack will make sure Jill (the AI agent working for the company) considers you for this role. Step 5. If Jill thinks you're a great fit and her client wants to meet you, they will make the introduction. Step 6. If not, Jack will find you excellent alternatives. All for free. We never post fake jobs This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network. Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description. We appreciate this can make them look a bit suspect, but there isn't much we can do about it. Give Jack a spin! You could land this role. If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.
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London, England, United Kingdom

Languages

English

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