Machine Learning and AI Engineer - London
About this role
You have built real AI systems that ship, break, and get fixed under pressure.You care less about model demos and more about decisions that move capital.You want your work used daily by professional investors, not buried in notebooks.You are comfortable owning hard problems end to end.If you want a calm job optimizing benchmarks, this is not it. The Role, In Plain English You will build and evolve the AI systems that power Reflexivity’s investment insights.This role exists because off-the-shelf models and generic pipelines are not enough.You will work at the intersection of reasoning engines, proprietary data, and real market impact.Your work directly affects how investors understand earnings, risk, and market catalysts. What You’ll Be Responsible For Design, fine-tune, and deploy ML and LLM-driven systems used in production by professional investors Build and maintain inference pipelines that are fast, observable, and reliable Integrate OpenAI, Gemini, and Anthropic models into reasoning and knowledge systems Work closely with backend engineers to productionize models in Golang-based services Improve signal quality, not just model accuracy Review code and designs with a bias toward long-term maintainability What “Good” Looks Like in This Role After 3 months:You understand the product, data flows, and investor use cases deeply. You ship meaningful improvements. After 6 months:You own major parts of the AI stack. Your work improves insight quality and latency measurably. After 12 months:You are a technical reference point for AI decisions. You raise the bar for how AI is built at Reflexivity.
What this role is, and what else it is called
Employers in London advertise this kind of work as Data Analyst, Data Engineer, Senior Data Engineer and AI Engineer too, so it is worth searching more than one wording. It is a mid-level Data, AI & Machine Learning role in London, advertised without a stated working pattern, which is worth asking about.
How this role compares to the market
105 live UK roles list Machine Learning right now, across 62 source domains. 48% of 33 roles with a known arrangement are remote. Browse Machine Learning roles.
London has 1,302 live IT vacancies across 694 source domains, with a median annual salary midpoint of £55,000. Browse London roles.
Market figures are today's snapshot of reportable live UK roles on public careers and vacancy pages; see hiring trends.
Technologies mentioned
Detected on Reflexivity's careers page. ProdReady Recruitment lists this vacancy as an aggregator and is not the employer; applications go to the employer's own site. More IT jobs in London.