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AI Engineer (Core Harness)

Granola· Tech
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London£100k - £130k + equity + bonusFull-timePosted 3mo ago

About the role

AI Engineer working on Core Harness team to turn models into useful agents by developing LLM-based features, evaluation frameworks, and scalable AI infrastructure in a startup environment.

Responsibilities

  • Own the development and application of LLM-based features end-to-end
  • Build and maintain evaluation frameworks for prompt iteration and semantic retrieval
  • Optimize embeddings and vector stores for performance and scalability
  • Interact with users to understand their problems and design solutions
  • Stay up-to-date with the latest trends in LLMs and applied AI practices
  • Collaborate with a cross-functional team of engineers, product managers, designers, and other members to create a cutting-edge product

Qualifications

  • Engineering experience at tech and product-driven companies
  • Shipping multi-provider LLM-based solutions to production (using e.g. OpenAI, Anthropic, Google, etc.)
  • Proficiency with LLM infra platforms (prompt management, logging/tracing, evals)
  • Experience designing large-context LLM systems (RAG, knowledge graphs, hybrid search, memory)
  • Building features end-to-end with TypeScript, React.js, and Node.js

Skills

Required:LLM-based feature developmentEvaluation frameworksEmbeddings and vector storesTypeScript/React/Node.js
Nice to have:User interaction

Benefits

  • Base Salary £100K – £130K
  • Equity
  • Benefits (inc private health, Mallorca villa & more)
  • Relocation assistance
Last updated Oct 18, 2026. Interested? Apply on the company site.
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