Quick answer
To hire a Flutter developer in the UK, write a one-page brief first, then shortlist people with published apps in both app stores, ask to see code or a technical walkthrough, run a small paid test task, and agree in writing who owns the code, the store accounts and the publishing keys. Check employment status rules before contracting an individual.
Flutter is Google’s toolkit for building one app that runs on both iPhone and Android, which is why it appeals to small businesses: one codebase, one developer, two stores. That also means a single hire carries the whole project. The checklist below is the order we would follow ourselves, with the questions that separate a developer who can finish an app from one who can only start one.
Before you look: the brief
- The one job of the app. “Customers book and pay for a dog walk” is a brief. “An app for my business” is not.
- Who uses it. Customers, staff, or both, and on which phones.
- The must-have screens for version one, and a separate list of later ideas.
- What it connects to: payments, a booking calendar, your website, an existing database.
- Your budget range and deadline, honestly stated.
- Whether you need an app at all. Many ideas work as a mobile-friendly web app with no store approval needed; our guide to no-code versus custom development helps you check.
The hiring checklist
| Check | What good looks like | Red flag |
|---|---|---|
| Published apps | Links to live apps in both the App Store and Google Play | Only screenshots or design mock-ups |
| Flutter depth | Can explain state management and how they structure a project | Vague answers, or “it’s all the same as web” |
| Native knowledge | Has handled iOS and Android specifics such as permissions and push notifications | Has never submitted an app to Apple |
| Back end | Clear plan for the server, database and logins behind the app | Assumes the app can work without one |
| Testing | Tests on real devices and uses test builds before release | “We’ll test at the end” |
| References | Past clients happy to speak to you | No contactable references |
| Ownership | Code, store accounts and keys in your name | Developer keeps the accounts “for convenience” |
Step-by-step: from shortlist to signed
- Shortlist three to five. Freelancers, small studios and agencies all build in Flutter. Our comparison of freelancer versus agency sets out the trade-offs, particularly what happens if one person is ill or moves on.
- Read their live apps. Download them. Are they quick, stable and well reviewed? Do they feel like proper phone apps?
- Ask for a technical walkthrough. If you are not technical, ask a trusted developer friend to join a half-hour call, or ask the candidate to explain one past project’s structure in plain English.
- Run a small paid test. A day or two of real work, such as one screen connected to a test database. You learn more from this than from any interview.
- Get a written estimate in stages: design, version one build, testing and store submission, then support. A single number with no breakdown hides risk.
- Agree the contract. Payment against milestones, ownership of all code and accounts, a handover of the source code at each stage, and what support costs after launch.
Contracts, IR35 and ownership
If you hire an individual contractor rather than a company, check whether the off-payroll working rules apply. GOV.UK’s guide to understanding off-payroll working (IR35) explains who is responsible for deciding employment status. For most small businesses hiring for a defined project, the rules sit with the contractor, but it is worth knowing before you sign.
Ownership matters more than most first-time app owners realise. Create the Apple developer account and the Google Play developer account in your business’s name, and add the developer as a user. Google’s help pages say a Play developer account carries a one-time US$25 registration fee at the time of writing, November 2026. If the developer holds the accounts and the signing keys, you do not truly own your app.
Questions to ask in the interview
- Which of your apps are you proudest of, and what went wrong on it?
- How will you handle Apple’s review if the app is rejected? (Apple’s App Store Review Guidelines are long, and rejections are common for first apps.)
- What happens to the app when Flutter, iOS or Android release a major update?
- How do you hand over code, and where will it be stored during the project?
- What would you cut to bring version one in under budget?
The last question is the best one. A good developer will happily simplify; a weak one says yes to everything and runs out of money halfway.
After launch: the part people forget
An app is never finished on launch day. Apple and Google release new versions of their operating systems every year, Flutter itself updates regularly, and the packages your app relies on change too. An app nobody maintains starts to break, slowly at first, and can eventually be removed from the stores. Agree before you start who will handle updates, how quickly bugs will be fixed and what that support costs each month or year. Ask for the source code to be kept in a repository your business controls, so a new developer could pick it up if needed.
Budget and timing
Costs vary widely with the number of screens, the back end and how polished the design must be. Our web app development cost guide explains what drives price for custom software generally, and the same drivers apply to phone apps. For reference, our own mobile app development starts at £2,999, built in React Native or Flutter, with larger apps quoted in writing. If a phone app turns out to be the wrong tool, our web applications start at £1,999. Every Luxbranding price is on our pricing page.
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Frequently asked questions
What should I look for in a Flutter developer? +
Live apps in both the App Store and Google Play, a clear explanation of how they structure a project, experience with iOS and Android specifics such as permissions and notifications, a plan for the server behind the app, real-device testing and contactable references. A small paid test task tells you more than any interview.
Should I hire a Flutter freelancer or an agency? +
A freelancer can be cheaper and more flexible, but the whole project depends on one person's availability. An agency usually costs more and brings design, testing and cover if someone is ill. For a business-critical app, check what happens if your developer moves on, and make sure you hold the code either way.
Who should own the app store accounts? +
Your business. Create the Apple and Google Play developer accounts in the business's name and add the developer as a user. Also make sure you hold the source code and the app's signing keys. If the developer controls the accounts, you cannot easily update or move the app without them.
Does IR35 apply when hiring a Flutter contractor? +
It can if you engage an individual through their own limited company. GOV.UK's off-payroll working guidance explains who must decide employment status. Many small businesses fall outside the client-side rules, but check before signing. Hiring a company to deliver a defined project is usually simpler.
