Hire Heads of Engineering

Head of Engineering specialist or generalist - which should you hire?

The honest answer depends on the half-life of your head of engineering surface area. If you expect to keep investing in Multi-team Leadership and Manager Coaching work over the next 18-24 months, a specialist head of engineering will out-deliver a generalist on day-30 throughput and stakeholder confidence.

If your team is under ten people, or head of engineering responsibilities are spread across two or three roles already, hire a strong generalist who has shipped this work in anger at least twice. The cross-disciplinary pattern recognition will pay for itself the first time priorities collide.

On Haystack we surface both - filtered by whether the candidate self-identifies as a head of engineering specialist and verified against their last two roles. Expect to pay around £140k–£175k for a mid-level UK hire, scaling toward £185k–£250k for senior.

What strong heads of engineering actually bring

A great head of engineering is not the one with the longest CV - it is the one who has owned a hard Multi-team Leadership call and changed how they work because of how it landed. Across the management hires we have placed in 2025-2026, the same patterns keep showing up.

• Active mentorship of at least one other head of engineering or adjacent role - usually a junior - within the first quarter.
• Versioned, observable head of engineering work - measurable outputs, structured logs of decisions, and a clear rollback path on every change.
• Documented trade-off notes on the calls they made, including the option they rejected and why.
• An opinion on what NOT to do with Multi-team Leadership, backed by an example where adding it would have hurt the team.

Red flags when interviewing heads of engineering

Every discipline has its own pattern of plausible-sounding answers that fall apart in production. For heads of engineering, these are the patterns that most often correlate with a six-month regret hire on the employer side.

• Cannot name a single head of engineering project where they removed scope rather than added it.
• Defines "senior head of engineering" purely by years of experience, not by the scope of decisions they own.
• Lists Multi-team Leadership on the CV but cannot describe a single trade-off they hit in production - all framework, no friction.
• Treats the head of engineering role as a job title rather than a problem to solve - no opinion on what they would change about how the discipline is typically practised.

A sample take-home for head of engineering candidates

When teams ask us how to evaluate a head of engineering beyond a CV and a chat, we recommend a 90-minute paid take-home that mirrors real work, not a trivia quiz. The brief below is one we have refined with employers hiring across management teams.

Give the candidate a small, intentionally imperfect artefact tied to "lead a group of engineering teams". Their task is to add a second capability - tied to "coach engineering managers and tech leads" - while keeping existing behaviour intact. Then grade in three parts.

• Correctness: the new work satisfies the brief and at least one edge case the candidate flags themselves.
• Judgement: did they refactor, wrap or work around the existing imperfection? Any of the three is fine - we are listening for the reasoning, not the verdict.
• Communication: a short written note explaining what they would do differently with another week, what they noticed about Multi-team Leadership, Manager Coaching and Technical Strategy, plus working exposure to Hiring, Delivery and Org Design, and the assumptions they made along the way.

What to expect in the first 30 days from a Haystack head of engineering hire

By week one, the new head of engineering should have shipped a small, low-risk artefact to production or a stakeholder - a docs fix, a small process change, a first review on someone else's work. The goal is to validate the loop, not to ship anything heroic.

By week two, the head of engineering is shadowing the active workstreams, attending standups in observe-mode, and asking pointed questions about why specific decisions were made. If they are not asking those questions, the hire is going to plateau.

By day 30, they own one cleanly-scoped slice of the head of engineering surface area, have published a public ramp-up doc, and are the named point of contact for stakeholders inside that slice. Every Haystack employer gets a structured onboarding template, so you are not reinventing the playbook each hire.