Hiring your first software engineer as a UK startup founder is nerve-wracking. You're juggling product, money, and now recruitment—without an HR person to handle the boring bits. You need someone who can actually code, fits your culture, and won't drain your runway before they write a line of production code. This guide cuts through the noise and gives you a straightforward playbook.
Define the Role (and Be Honest About It)
Before you post anything, know what you actually need.
Junior engineer? Mid-level? Full-stack or specialist? The UK talent market has different supply curves for each. If you're a pre-revenue startup, a mid-level engineer with 5+ years might expect £50–70k salary plus options. A junior (0–2 years) might be £28–40k. Be specific in your job posting—vague posts attract time-wasters.
Also be honest about stage. Saying "we're pre-seed but have 6 months of runway" beats the awkward conversation three months in. Good engineers respect transparency.
Where to Find Engineers in the UK
Your options:
- LinkedIn: Search by location and skills. Cold outreach works but expect a 10–15% response rate. Personalize every message.
- Tech communities: Hacker News jobs, Stack Overflow careers, local Slack groups (London Tech Leaders, Founders Slack UK). Low volume but higher intent.
- Recruiters: Expect 15–25% commission on first-year salary. Useful if you're busy, painful if you have budget constraints.
- Referrals: Ask your network, angel investors, and current advisors. Still the best source.
- Universities: Cambridge, Imperial, UCL produce strong early-career engineers. Consider a graduate hiring scheme if you have capacity to mentor.
Post everywhere at once—speed matters in competitive markets.
Screening & Interviews
Once applications roll in, move fast.
First pass: Check for basic fit—do they have relevant experience? Can they write coherent English in their CV? (Communication matters in small teams.) Reject politely and quickly for obvious no's.
Technical screening (30 mins): A junior engineer should solve a simple coding problem. A mid-level engineer should discuss architecture or walk through a past project. Don't make it a gotcha session; you're assessing thinking, not proving they're dumb.
Culture fit interview: This is where most founders fail. Ask about previous team sizes, how they handled conflict, and why they want your company. You're checking if they'll thrive when the product pivots three times.
Reference check: Call their last manager. Takes 15 minutes and saves months of regret.
The whole process, start to finish, should take 2–3 weeks. If you're managing this without a hiring tool, spreadsheets get messy fast. Penroll runs the entire pipeline—screening, scheduling, scorecards—so you're not chasing candidates through email. The first hire is free, and further hires are one-time packages from $19 per hire rather than a monthly subscription.
Contracts & Compliance
Once you've hired, get the paperwork right:
- Employment contract: Specify start date, salary, notice period (typically 1 month for junior hires), and any IP assignment clause (your code belongs to the company).
- Pension: Legal requirement after 3 months (PAYE threshold). Use a workplace pension provider; Nest or Now Pensions are popular with startups.
- Right to work: Verify their visa status before day one. Post-Brexit, you'll need Skilled Worker visa sponsorship or settled status for most non-UK hires.
- References: Log them. If things go wrong, you need evidence you hired diligently.
Templates exist online (Rocket Lawyer UK, Crunchbase). Spend £100–200 on a solicitor to review if you're unsure.
Onboarding (Actually Matters)
Your engineer's first two weeks set the tone.
Prepare: codebase access, dev environment docs, a Slack channel, coffee with a co-founder on day one. Small gesture, outsized impact on retention.
Hiring is friction, but it's non-negotiable at your stage. Get the process right and you're not just hiring an engineer—you're hiring your first real team member. Move deliberately but fast, be transparent about stage, and handle the admin properly.