Demand for engineering talent is high, and the people you want are rarely sitting still. A striking 79% of UK technical professionals plan to change employers in 2026, according to recruitment firm Rise Technical's 2025/26 Insights Report.
That churn is good news and a warning at the same time. There's a large pool of engineers open to a move, but most of them are already employed. When someone is in a permanent role, their notice period becomes the single biggest factor in when they can actually start. In defence and security, where contracts often reflect seniority and clearance, that window tends to sit at the longer end.
Notice periods in defence engineering roles are shaped by a few forces working together. Seniority is the obvious one: the more responsibility a role carries, the longer the contractual notice, often three months for lead and principal engineers. Security clearance adds another layer. Projects tied to sensitive programmes rely on continuity, so employers write longer notice into contracts to protect delivery.
There's also the specialist nature of the work. Systems engineers, software engineers on embedded platforms, and electronics specialists are hard to replace at short notice, so their current employers hold on to them for as long as the contract allows. With 79% of UK technical professionals planning to change employers in 2026, according to Rise Technical's 2025/26 Insights Report, the competition for these people is intense, which pushes notice and transition planning up the priority list.
The practical effect is simple: the person you offer today may not sit at a desk for weeks or months. If you plan around an immediate start, you'll be caught short. If you plan around a four-week to three-month notice window, you stay in control.
Hiring well here is about speed where it counts and patience where it matters. Move fast through the early stages, because the strongest engineers get multiple approaches and the one in five staying put means a smaller active pool, as Rise Technical's 2025/26 Insights Report suggests with 79% planning a move. Then plan the transition carefully once you've chosen someone.
The goal is a steady pipeline, not a single scramble. When you treat notice as a known quantity rather than a surprise, you can run a calm, well-timed process that keeps the business covered.
We built Reed.ai to make this kind of hiring faster and fairer. We search a database of 15 million candidates to surface engineers who match your role, including people open to a move but still working their notice. Our recruitment agent manages recruitment end to end for 8% on a successful hire, with no monthly fee and no upfront cost. Start your next defence engineering hire with us today.
