Question 1

Back End Engineer vs Full Stack Engineer - what is the actual difference?

Accepted Answer

Back End Engineers focus on design, build and maintain apis and backend services. Full Stack Engineers focus on own features from spec to production. 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 back end engineer or a full stack engineer?

Accepted Answer

Both pools are active on Haystack. First shortlists land within 24 hours of kick-off for either role. Mid-level back end engineers anchor around £65k–£85k UK base, full stack engineers around £65k–£88k, so total cost over an 18-month horizon is the more useful comparison than headline pay.

Question 3

Can the same person cover both back end engineer and full stack 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 back end engineer interview?

Accepted Answer

Anchor the rubric on Node.js, Python, Java. 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 full stack engineer interview?

Accepted Answer

Anchor the rubric on TypeScript, React, Node.js. As with the back end 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 back end engineers and full stack 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	Back End Engineer	Full Stack Engineer
Category	Engineering	Engineering
Mid-level UK base	£65k–£85k	£65k–£88k
Senior UK base	£90k–£130k	£90k–£130k
Primary focus	Design, build and maintain APIs and backend services	Own features from spec to production
Core skills	Node.js, Python, Java, Go	TypeScript, React, Node.js, Next.js
First shortlist	24 hours	24 hours

Back End Engineer vs Full Stack Engineer

Back End Engineer

Full Stack Engineer

Back End Engineer vs Full Stack Engineer - at a glance

Back End Engineer vs Full Stack Engineer - common hiring questions

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