How to Hire a Full Stack Developer in the UK

Read further and you’ll find out how to hire a full stack developer in the UK: the seven steps, the four routes, the real monthly cost, and the IR35 position.

How to Hire a Full Stack Developer: The Seven-Step Process

The seven-step process to hire a full stack developer covers scope definition, route selection, job specification, evidence screening, a paid trial task, employment status confirmation, and structured onboarding.

Each step removes a specific category of hiring risk. Companies that skip step five account for the largest share of failed developer hires. A CV and an interview measure communication rather than code.

Step 1: Define the Scope and Stack

Name the exact technologies the role touches, such as React, Node.js, PostgreSQL, and AWS. Vague specifications attract vague applicants. Write down the product surface the developer owns, the existing codebase size, and the 3 features shipping next quarter.

Step 2: Choose the Hiring Route

Select from 4 routes, because route choice fixes your cost and your legal exposure. A PAYE hire suits equity-holding engineers on a 5-year horizon. A freelance platform suits a fixed build under 3 months. A dedicated remote agency suits ongoing product work on a predictable monthly budget.

Step 3: Write the Job Specification

State the stack, the product, the reporting line, and the salary band in under 500 words. Published salary bands lift application rates. Name the working hours and the timezone overlap, because remote developers self-select on that line before reading anything else.

Step 4: Screen for Evidence, Not Keywords

Request 2 production repositories or live URLs, and reject any application without shipped work. CVs list frameworks. Repositories show commit history, test coverage, and code review habits. Open a pull request the candidate authored, then read the discussion underneath it.

Step 5: Run a Paid Trial Task

Pay for a 4 to 6 hour scoped ticket that mirrors your real backlog. Unpaid tasks filter out strong candidates first, because strong developers hold offers elsewhere. Score the submission on 4 criteria: working output, code clarity, test coverage, and the questions the candidate asked before starting.

Step 6: Confirm Employment Status

Establish IR35 position, right to work, and the contracting party before an offer goes out. Status determination after an offer costs you the candidate. Run the HMRC CEST tool for a contractor engagement, and record the outcome in writing.

Step 7: Onboard Against a 90-Day Plan

Set repository access on day 1, a first merged pull request by day 5, and reviews at 30, 60, and 90 days. A first merged pull request inside week 1 predicts retention. Assign one named colleague as the technical contact, then hand the developer a real ticket rather than documentation.

Running all seven steps in-house takes a UK hiring manager 6 to 12 weeks of direct work. Teambuild Consultancy compresses that to a shortlist inside 1 to 2 weeks. Teambuild owns steps 2 through 6 on your behalf. Each shortlisted developer arrives pre-vetted, with the trial task already done. 

Some founders keep their calendar on product rather than screening. Those founders hand the sequence to Teambuild’s full stack developer hiring service, then interview a shortlist.

Where to Find Full Stack Developers in the UK

UK businesses find full stack developers through 4 routes: direct hiring on job boards, recruitment agencies, freelance platforms, and dedicated remote staffing agencies. Each route changes your time to hire, your monthly cost, and the party that carries payroll liability.

Teambuild Consultancy is a London-based remote staffing agency at Level 18, 40 Bank Street, Canary Wharf, E14 5NR. Teambuild operates the fourth route.

The table below compares the 4 hiring routes across time, cost, payroll ownership, HR risk, and best-fit scenario.

Route	Time to hire	Monthly cost	Payroll owner	HR risk owner	Best fit
Direct PAYE hire	6 to 12 weeks	£6,700 fully loaded	Your business	Your business	Your businesFunded teams wanting an equity holder on the product long terms
Recruitment agency	4 to 8 weeks	£6,700 plus 15% to 25% fee	Your business	Your business	Senior or lead roles where the market is thin
Freelance platform	1 to 2 weeks	£4,000 to £9,000	The contractor	Shared	Fixed-scope builds under 3 months with a defined end date
Dedicated remote agency	1 to 2 weeks	£900 to £3,500	Teambuild Consultancy	Teambuild Consultancy	Ongoing product work on a fixed monthly budget

Direct PAYE hiring beats every other route when a founder wants an equity-holding engineer inside the company for 5 years. Recruitment agencies win on genuinely scarce senior roles. Freelance platforms win on a 6-week fixed build. Teambuild wins on ongoing development at a predictable monthly cost. 

Teambuild’s developer pricing sits at £900 to £1,500 per month part-time. Full-time runs £1,500 to £3,500 per month for a dedicated remote employee.

IR35, Employment Status, and Payroll

IR35 applies to a full stack developer engaged through a personal service company. IR35 does not apply to a PAYE employee. IR35 also excludes a developer employed by a staffing agency such as Teambuild Consultancy.

UK medium and large businesses carry the status determination duty under the April 2021 off-payroll rules. An incorrect determination transfers the unpaid tax and National Insurance liability back to the engaging business.

• Inside IR35: HMRC treats the developer as an employee for tax, so the fee payer deducts income tax and National Insurance at source.
• Outside IR35: HMRC treats the developer as genuinely self-employed, so the contractor handles tax through the personal service company.
• Right to work: UK employers verify right to work before day 1, and a share code check covers most non-UK passport holders.
• Employment risk: The employing entity carries tribunal exposure, statutory sick pay, holiday accrual, and pension auto-enrolment.

Route choice settles the IR35 question outright. Small companies fall outside the off-payroll rules below 2 of the 3 size thresholds. The contractor keeps the determination duty in that case.

A dedicated remote developer employed by Teambuild removes 4 obligations from your business at once. Teambuild employs the developer, so no status determination lands on your finance team. Teambuild runs the payroll, so no PAYE registration, no employer National Insurance, and no pension auto-enrolment reach your books. 

Teambuild holds the HR liability under Teambuild’s payroll and HR handling, so tribunal exposure, statutory sick pay, and holiday accrual sit with Teambuild Consultancy. Teambuild carries the right to work checks before day 1. Your business receives one monthly invoice at £900 to £3,500 and keeps zero employment risk.

Frequently Asked Questions

Hire a Full Stack Developer Without Running the Seven Steps

Teambuild Consultancy places dedicated remote full stack developers with UK businesses. Rates run £900 to £1,500 per month part-time and £1,500 to £3,500 full-time. 

Teambuild handles route selection, screening, the paid trial task, employment status, and payroll. Book a scoping call from Level 18, 40 Bank Street, Canary Wharf, and review a shortlist inside 2 weeks.