Senior Machine Learning Engineer — Ranking & Recommendations Tech Stack: Python, GCP, BigQuery, dbt, modern ML frameworks, LLMs, embeddings, RAG Salary: £110,000 – £130,000 plus 8% bonus Contract: Permanent, full-time Location: London, 3 days per week Sponsorship: Tier 2 sponsorship available 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 mmatysik@trg-uk.com