Senior Machine Learning Engineer

trg.recruitment; Greater London; On-site; GBP 85,000 - 110,000; Full time

Job summary

A fast-growing startup in Greater London seeks a Senior Machine Learning Engineer to establish the recommendations infrastructure from scratch. This role offers significant ownership, working closely with Data, Product, and Engineering teams to embed ML capabilities into the user experience. Ideal candidates have over 5 years of experience in machine learning, particularly in ranking and recommendation systems, and are proficient in Python and cloud-based ML technologies like GCP. A competitive package and opportunity for growth await.

Qualifications

• 5+ years of experience in machine learning engineering.
• Strong track record building ranking, recommendation, or personalisation systems in production.
• Experience using generative AI such as LLMs for embedding generation.

Responsibilities

• Design, build, and own the recommendations infrastructure.
• Define long-term ML strategy and best practices for model development.
• Collaborate closely with Product, Engineering, and Data teams.

Skills

Machine learning engineering

Ranking systems

Recommendation systems

Generative AI

Cloud-based ML infrastructure (GCP)

Python proficiency

Tools

BigQuery

dbt

Job description

Senior Machine Learning Engineer — Ranking & Recommendations

Tech Stack: Python, GCP, BigQuery, dbt, modern ML frameworks, LLMs, embeddings, RAG

Contract: Permanent, full-time

We're looking for a Senior Machine Learning Engineer to be the first dedicated ML hire. You'll work alongside the Data Engineering team to design, build, and own the recommendations infrastructure from the ground up, while helping define the long-term ML strategy - establishing best practices for model development, experimentation, evaluation, and monitoring.

As the first ML engineer, you'll have significant ownership and the opportunity to shape the discipline as we scale, collaborating closely with Product, Engineering, and Data teams to ensure ML capabilities are deeply embedded in the user experience.

We're looking for someone with deep experience in ranking and recommendation systems, who thrives on building from zero to one and wants real ownership in a fast-growing startup.

Must-haves

• 5+ years of experience in machine learning engineering
• Strong track record building ranking, recommendation, or personalisation systems in production
• Experience using generative AI across a product - LLMs for embedding generation, semantic understanding, conversational interfaces, feature generation, RAG, etc.
• Experience working with large-scale user behavioural data; proficiency with Python and modern ML frameworks
• Experience with cloud-based ML infrastructure (ideally GCP)
• Familiarity with data warehousing tools such as BigQuery and dbt

Interested? Apply below or reach out directly at [e-mail]