Question 1

AI Engineer vs LLM Engineer - what is the actual difference?

Accepted Answer

AI Engineers focus on design and ship ai-powered product features. LLM Engineers focus on ship llm-powered product features end-to-end. The two roles are often confused because they sit next to each other in modern delivery teams, but the day-to-day work, the success metric and the interview rubric are not the same.

Question 2

Which is easier to hire - a ai engineer or a llm engineer?

Accepted Answer

Both pools are active on Haystack. First shortlists land within 24 hours of kick-off for either role. Mid-level ai engineers anchor around £80k–£110k UK base, llm engineers around £82k–£115k, so total cost over an 18-month horizon is the more useful comparison than headline pay.

Question 3

Can the same person cover both ai engineer and llm engineer work?

Accepted Answer

Often partially. Senior generalists carry one as their primary discipline and one as supporting, but expect a 60/40 split rather than 50/50 - the deep work in either role rarely happens in the same week. If the workload sustains, hiring one of each is almost always the better long-term call.

Question 4

What skills should I screen for in a ai engineer interview?

Accepted Answer

Anchor the rubric on LLMs, RAG, Vector databases. We surface every Haystack profile with the specific tooling, levels and shipped-work examples so you can shortlist against a real skills bar, not buzzwords.

Question 5

What skills should I screen for in a llm engineer interview?

Accepted Answer

Anchor the rubric on LLMs, RAG, Evals. As with the ai engineer role, the easiest way to compare candidates is a 90-minute paid take-home that mirrors real work - never a trivia quiz.

Question 6

Do you cover senior and lead-level ai engineers and llm engineers?

Accepted Answer

Yes - the full ladder from junior through staff/principal in both. The kick-off call captures the level and shipped-work bar you need, and shortlists are filtered accordingly.

Dimension	AI Engineer	LLM Engineer
Category	Engineering	Engineering
Mid-level UK base	£80k–£110k	£82k–£115k
Senior UK base	£115k–£170k	£125k–£180k
Primary focus	Design and ship AI-powered product features	Ship LLM-powered product features end-to-end
Core skills	LLMs, RAG, Vector databases, LangChain	LLMs, RAG, Evals, Vector databases
First shortlist	24 hours	24 hours

AI Engineer vs LLM Engineer

AI Engineer

LLM Engineer

AI Engineer vs LLM Engineer - at a glance

AI Engineer vs LLM Engineer - common hiring questions

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