Outside IR35 Mobile Developer Contract Jobs

As a contract Mobile Developer, you are hired to build, maintain, and improve applications for iOS and Android mobile platforms, either working natively in Swift or Kotlin on a single platform, or using cross-platform frameworks such as React Native or Flutter to develop applications that run across both platforms from a shared codebase. Contract engagements arise across all sectors where mobile products are commercially important, from consumer-facing fintech and retail apps to enterprise mobility solutions and healthcare applications. Contractors are brought in to build new mobile applications, to deliver major feature releases, to migrate from an older mobile technology to a modern stack, or to provide additional senior mobile engineering capacity within a product team during a period of intensive delivery.

What sets strong Mobile Developer contractors apart is depend on the platform and framework choice. Native iOS developers are expected to be proficient in Swift and increasingly SwiftUI, with UIKit experience for maintaining older applications. Native Android developers need strong Kotlin skills alongside Jetpack Compose for modern UI development. React Native contractors need strong JavaScript and TypeScript skills alongside knowledge of the React Native ecosystem, bridging to native modules, and the specific performance and debugging considerations of cross-platform development. Flutter contractors need Dart language proficiency and familiarity with Flutter's widget system and state management approaches. Across all mobile platforms, experience with app store submission, mobile CI/CD pipelines, crash reporting tooling, and the performance optimisation techniques specific to mobile environments is expected at senior level.

The market for Mobile Developer contractors is an active mid-to-high volume market across the consumer and enterprise mobile development space. The consumer fintech, banking, and retail sectors are among the most consistent buyers of mobile contractor resource, given the commercial importance of the mobile product as a customer touchpoint. React Native has grown significantly in popularity as a cross-platform approach, creating a substantial contracting market for contractors who can build performant mobile experiences from a shared JavaScript codebase. Flutter is an emerging and growing segment with particular strength in early-stage and Google Cloud-aligned organisations. Rates are broadly aligned across iOS, Android, and cross-platform frameworks at equivalent seniority levels, with senior mobile engineers on complex consumer-facing applications commanding rates at the upper end of the software development contracting market.

IR35 is UK tax legislation that determines whether a contractor is genuinely self-employed or working in a manner that resembles employment. When a contract is classified as outside IR35, the engagement is treated as a business-to-business arrangement. The contractor operates through their own limited company, invoices for services, and manages their own tax affairs including corporation tax, self-assessment, and VAT where applicable.

Outside IR35 engagements are assessed against three key factors: the degree of control the client exercises over how the work is delivered, whether the contractor has a genuine right to provide a substitute, and whether there is a mutuality of obligation between the parties. Contracts that demonstrate contractor autonomy, project-based delivery, and the absence of ongoing employment obligations are more likely to sit outside IR35. Since April 2021, responsibility for making this determination sits with the end client for medium and large private sector organisations.

On QualityContracts.co.uk, approximately 28% of roles with a stated IR35 status are classified as outside IR35. The proportion varies by sector and role type, with some disciplines seeing a significantly higher or lower share of outside IR35 opportunities. Each listing on this page displays its IR35 status where provided by the hiring organisation.

Mobile development has a favourable outside IR35 profile. App development projects, whether native iOS, Android, or cross-platform with React Native or Flutter, have natural project boundaries: design, build, test, and release. The discrete nature of mobile releases creates clear deliverables. Digital agencies, startups, and product companies commissioning mobile app builds or major feature releases are the typical clients. Contractors who can deliver across the full mobile lifecycle from architecture through to App Store and Play Store submission are most sought after.

Contract rates for mobile developer roles typically range from £450 to £850 per day, depending on the scope of the role, required expertise, and the delivery expectations of the engagement. Rates shown are for outside IR35 engagements and reflect the gross day rate paid to the contractor's limited company before any personal tax obligations.

Over the past twelve months, we have tracked over 150 mobile developer contract roles across the site. Of the roles currently listed on our site, around one in four are Outside IR35. Data reviewed up to March 2026.