Senior Android Engineer (Contract, Outside Ir35)

Hedgehog Lab; City of Edinburgh; Remote; GBP 83,000 - 120,000; Full time

Benefits offered by this job

Remote work

Job summary

hedgehog lab is delivering a UK bank's Android app, moving to Jetpack Compose. This contract, outside IR35, starts January 2027 and runs for ~6 months with remote-first working.

You will join a consultancy team focused on testing, code reviews, and code quality, building UI in Compose from the ground up, and expanding a modernising codebase while adding regulated banking work to your CV.

Qualifications

• Commercial Android experience in Kotlin, including Coroutines and Flow.
• Jetpack Compose alongside XML layouts and Data Binding; some Java for legacy code.
• MVVM architecture with Hilt and Dagger; focus on tests and security.

Responsibilities

• Build new features and screens in Jetpack Compose.
• Migrate XML/Data Binding screens to Compose.
• Work in Kotlin with some legacy Java in MVVM using Hilt and Dagger.
• Consume REST APIs and maintain third-party SDKs.
• Write unit tests with JUnit and MockK to keep changes safe.
• Debug on emulators and real devices, addressing performance issues.
• Review PRs and participate in sprint planning, stand-ups and retrospectives.

Skills

Kotlin

Jetpack Compose

XML layouts

Data Binding

Java

MVVM

Hilt

Dagger

Unit testing

Mobile security

Tools

JUnit

MockK

REST APIs

Job description

Contracting often means being dropped into a client's team as the outsider.

Here you'll join a hedgehog lab team delivering a UK bank's Android app as it moves to Jetpack Compose.

It's a contract outside IR35, expected to start in January 2027 and run for around 6 months. You'll work on a remote first basis.

What's in it for you

You'll be part of a consultancy team that owns the delivery, working with people who care about testing, code reviews and code quality.

You'll build new UI in Compose from the start, on a codebase that's actively modernising.

You'll add regulated banking work to your CV, which carries weight on future contracts.

Who you'll be doing it for

hedgehog lab is a digital product consultancy with 20 years of experience helping public and private sector organisations through digital transformation. We're B Corp and Great Place to Work certified.

You'll be part of a hedgehog lab delivery team working on our client's customer-facing Android app. Our client is a well-known UK bank.

What you'll be doing

• Building new features and screens in Jetpack Compose
• Maintaining XML and Data Binding screens and migrating them to Compose
• Working in Kotlin, with some legacy Java, within an MVVM architecture using Hilt and Dagger
• Consuming REST APIs and maintaining third-party SDKs
• Writing unit tests with JUnit and MockK so changes and refactors stay safe
• Debugging on emulators and real devices, including performance issues
• Reviewing pull requests and taking part in sprint planning, stand-ups and retros

Experience you must have

• Commercial Android experience in Kotlin, including Coroutines and Flow
• Jetpack Compose, plus XML layouts, Data Binding and enough Java to work on older code
• MVVM and dependency injection with Hilt and Dagger
• Unit testing with JUnit and MockK, and using tests to make safe changes in large codebases
• Mobile security, particularly protecting sensitive data and securing network calls

Experience that's nice to have

• Banking, fintech or other regulated apps
• SAFe or another scaled agile framework
• Migrating XML screens to Compose
• UI testing with Espresso or Compose
• Certificate pinning, code obfuscation and root detection
• Accessibility experience