Lorien
Generative AI Engineer
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AI / GenAI Engineer
Contract Length: 1 Year Rolling
Location: Hybrid - London, 3 days a week
IR35 Status: Inside
Summary:
We're hiring software engineers to build, evaluate, and operate production-grade AI applications, agents, and reusable tooling. This is a software engineering role specialized in AI, not a prompt-writing or experimentation-only position.
What you'll be doing:
- Implementing agents, AI-assisted workflows, retrieval systems, and model integrations
- Building the deterministic tools and APIs that agents use to interact with enterprise systems
- Developing automated evaluations for quality, safety, reliability, and regression detection
- Implementing guardrails, permissions, traceability, fallback, and human-escalation mechanisms
- Instrumenting solutions for cost, latency, behaviour, and business-outcome monitoring
- Optimizing context management, model selection, and inference patterns
- Contributing reusable components, development standards, and reference implementations
- Diagnosing production failures and continuously improving system performance
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What we're looking for:
- A strong software engineer with real experience in APIs, cloud systems, testing, and production operations
- Practical, working knowledge of LLM application patterns
- Different seniority levels welcome; solid engineering fundamentals matter more than years of AI-specific experience
- A problem-solver mindset, comfortable working across multiple business areas rather than a single fixed remit
- MBB consulting background (McKinsey, Bain, BCG) is a strong plus, though not required for this role
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How this works:
- Open to contract or permanent hire
- UK-based candidates: ideally on-site 3 days a week
- Candidates based outside the UK: on-site 3 days every fortnight, with flights and accommodation covered for the right candidate with consulting-firm pedigree
- All contract engagements sit inside the scope of IR35
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