4,539 Mobile Development jobs in the United Kingdom

Senior Android Developer (Kotlin | AI | SDKs)

Salary:
£60,000 – £85,000 base

Location:
Manchester

Employment Type:
Permanent

Seniority:
Mid–Senior Level

Tech Stack:
Kotlin, Android SDK, Jetpack, Swift (bonus), GitHub Actions, Pulumi

About the Company

Join a
global AI tech start-up
founded by a
visionary leader in the AI space
, pioneering a completely new field of
Behavioural AI
.

Their technology is redefining how humans and machines interact, using biometric and behavioural signals to create smarter, more human-like systems. This is an opportunity to
shape the Android side of a truly emerging product
, where your work will directly power how clients and users first experience their AI innovations.

The Role

As the
Senior Android Developer
, you'll take
full ownership of the Android migration process
, bringing all existing
iOS functionalities
into the Android ecosystem.

In your first 3–6 months, your mission will be to
migrate the iOS app to Android,
ensuring feature parity, smooth performance, and clean architecture. You'll also help lay the groundwork for
future expansion to tablets and wearable devices
.

Beyond migration, you'll design and build new Android apps and SDKs that enable
AI experimentation and client integration
, ensuring users have a seamless and robust experience.

This is not your typical app dev role, you'll be working at the intersection of Android engineering, SDK development, and applied AI, helping to shape products that are literally the first of their kind.

If you're a
Kotlin specialist
who thrives on ownership, architecture, and building clean, scalable mobile systems, this is your lasting opportunity to leave a visible impact on a truly emerging technology.

Key Responsibilities

• Lead the migration
  of all iOS functionalities into Android — taking complete ownership of the process.
• Develop Android applications and SDKs
  that enable client integration with cutting-edge AI technology.
• Collaborate cross-platform
  with iOS engineers to ensure consistency and parity.
• Architect Android solutions
  that are scalable, maintainable, and testable (Hexagonal Architecture, clean code principles).
• Work closely with
  AI researchers
  to bring experimental models to life on mobile devices.
• Potentially expand development to
  tablet and wearable platforms
  .

What We're Looking For:

Technical Must-Haves:

• Proven
  commercial experience
  as an
  Android Developer / Engineer.
• Deep proficiency in
  Kotlin
  and hands-on experience with the
  Android SDK
  .
• Strong understanding of
  modern app architecture
  and clean, testable code.
• Familiarity with
  CI/CD automation tools
  (e.g. GitHub Actions, Pulumi).
• Experience with
  AI, biometrics, or behavioural technology
  is a major plus.
• Nice to have:
  iOS/Swift experience
  or willingness to pick it up for future cross-platform needs.

Soft Skills & Cultural Fit:

• Self-driven and able to work autonomously.
• A practical problem-solver who enjoys tackling complex challenges.
• Collaborative and humble — confident in your abilities but not ego-driven.
• Strong communication skills, able to work seamlessly with quieter team members.

Preferred Experience:

• Prior experience in
  B2B environments
  (with longer, more deliberate release cycles) over B2C.
• Track record of
  taking ownership
  of Android roadmaps and delivering high-quality results.

Top Priorities in the First 6 Months

1. Migrate all existing iOS functionalities
   to Android.
2. Own and lead
   the Android development process.
3. Deliver quickly
   to meet client needs and enable product growth.

Career Growth & Future Opportunities

This role offers two exciting long-term paths:

• Own the Android function
  within the company, becoming the go-to technical authority.
• Progress into a
  Senior Principal Software Engineer
  role covering both Android and iOS platforms.

You'll also gain exposure to applied
AI, biometrics, and behavioural computing
— areas growing rapidly across global tech markets.

Why Join

• Be part of an
  early, high-impact engineering team
  driving a new category of AI.
• Collaborate with a world-class team in
  AI research, design, and product development
  .
• Shape Android architecture from the ground up with
  freedom and autonomy
  .
• Competitive compensation, hybrid flexibility, and long-term growth potential.

We're looking for a Senior Android Developer to join an innovative tech company that delivers cutting-edge solutions to regulated industries such as Finance and Healthcare.

In this role, you will take ownership of developing Enterprise-level Android applications to enhance user experiences and support delivery of high-quality products.

Role: Senior Android Developer

Location: London, UK

Total comp: £65-£75k

Requirements for the role:

• Strong experience in Kotlin and Android app development.
• Proven track record of building Enterprise level Android apps.
• Deep understanding of mobile development best practices, including UI/UX design principles, debugging, and testing.
• Familiarity with app deployment processes, including Google Play submission, signing keys, and building pipelines.
• A portfolio of previous Android apps or code samples is highly desirable.

If you are a Senior Android Developer interested and wish to learn more please apply or get in touch for more details as interviews will be taking place immediately.

We're looking for a Senior Android Developer to join an innovative tech company that delivers cutting-edge solutions to regulated industries such as Finance and Healthcare.

In this role, you will take ownership of developing Enterprise-level Android applications to enhance user experiences and support delivery of high-quality products.

Role: Senior Android Developer

Location: London, UK

Total comp: £65-£75k

Requirements for the role:

• Strong experience in Kotlin and Android app development.
• Proven track record of building Enterprise level Android apps.
• Deep understanding of mobile development best practices, including UI/UX design principles, debugging, and testing.
• Familiarity with app deployment processes, including Google Play submission, signing keys, and building pipelines.
• A portfolio of previous Android apps or code samples is highly desirable.

If you are a Senior Android Developer interested and wish to learn more please apply or get in touch for more details as interviews will be taking place immediately.

We're looking for a Senior Android Developer to join an innovative tech company that delivers cutting-edge solutions to regulated industries such as Finance and Healthcare.

In this role, you will take ownership of developing Enterprise-level Android applications to enhance user experiences and support delivery of high-quality products.

Role: Senior Android Developer

Location: London, UK

Total comp: £65-£75k

Requirements for the role:

• Strong experience in Kotlin and Android app development.
• Proven track record of building Enterprise level Android apps.
• Deep understanding of mobile development best practices, including UI/UX design principles, debugging, and testing.
• Familiarity with app deployment processes, including Google Play submission, signing keys, and building pipelines.
• A portfolio of previous Android apps or code samples is highly desirable.

If you are a Senior Android Developer interested and wish to learn more please apply or get in touch for more details as interviews will be taking place immediately.

Job Title: iOS Developer (SwiftUI)

Location: Leicester, UK (Hybrid: 3 days onsite)

Duration: 6-Month Fixed Term Employment (FTE)

About the Role:

UST is seeking a skilled iOS Developer to join our team on a 6-month fixed-term contract. You will play a key role in designing, developing, and maintaining high-performing iOS applications for a leading client in Leicester. This role offers an exciting opportunity to work with modern technologies in a collaborative, forward-thinking environment.

Key Responsibilities

• Design and develop high-performing iOS applications using Swift and SwiftUI .
• Work effectively within the Apple ecosystem , leveraging Xcode IDE .
• Optimize app performance and troubleshoot complex technical challenges.
• Implement automated testing (unit and UI) using the XCTest framework.
• Collaborate in an Agile/Scrum environment , actively contributing to sprints and ceremonies.
• Support CI/CD pipelines using Git and Azure DevOps.
• Integrate and manage RESTful APIs to ensure smooth data flow.
• Deliver applications that meet accessibility standards and enhance user inclusivity.
• Work with deeplinking, universal links, and custom URLs to support marketing initiatives.

Required Skills & Experience:

• Strong experience in iOS application development using Swift & SwiftUI .
• Proven hands-on expertise in Xcode IDE and Apple’s developer ecosystem.
• Experience with RESTful API integration and modern mobile architectures.
• Knowledge and application of CI/CD best practices .
• Ability to deliver high-quality solutions in Agile development environments.
• A passion for creating accessible, user-focused applications .

Nice-to-Have / Preferred:

• Previous experience working in hybrid environments or fixed-term contracts.
• Familiarity with advanced iOS features such as deep linking and custom URLs.

Why Join Us:

• Work with modern technologies in a collaborative and innovative team.
• Contribute to a high-impact project for a leading client in Leicestershire.
• Opportunity to expand skills in SwiftUI, CI/CD, and REST API integration .

We offer:

• Competitive salary package.
• Medical insurance.
• Flexible schedule.
• Opportunities for career growth and professional development.
• Supportive and collaborative work environment.
• Modern office space in Nottingham with easy access to transport.

We’re grateful for your interest in joining our team. Kindly note that only applicants whose experience and qualifications most closely align with the role will be contacted for the next steps. Thank you for your understanding.

About Us:

Two Circles – Job Description Summary

We are Two Circles. We are a Sports & Entertainment Marketing business. We grow audiences and revenues. We do that by knowing fans best. We work with clients to help them understand & influence what their fans are doing – the way fans spend their money, the events that fans attend, the channels fans respond to, the content fans watch and more. And we use the understanding this gives us to help our clients grow. Grow their audiences and grow their revenues - both direct to consumer and business to business revenues. Our platforms and services are trusted by over 1000 clients globally, including the English Premier League, Red Bull, UEFA, VISA, the NFL, Nike and Amazon. We are over 1000 people, based out of 15 offices, and we deliver work for sports and entertainment businesses of all shapes and sizes all over the world.

Requirements

• Build and maintain high-quality native iOS applications using Swift and SwiftUI, with a focus on fast delivery and maintainable architecture.
• Work closely with internal teams and client stakeholders to develop end-to-end mobile features that align with product goals and timelines.
• Contribute to architectural decisions in collaboration with senior engineers — with a strong emphasis on scalability, testability, and performance.
• Collaborate within cross-functional squads (designers, PMs, QA, backend) to ship new features to live apps used by sports fans worldwide.
• Ensure a high standard of quality through code reviews, testing, and engineering best practices.
• Join a hybrid working environment, with 2 days per week in our London office to enable strong collaboration on fast-moving projects.

What We’re Looking For

• Proven expertise in Swift and SwiftUI, ideally with multiple apps shipped to the App Store or in production use.
• Strong understanding of scalable app architectures (e.g. MVVM-C, TCA, modularisation, dependency injection).
• Passion for delivering high-quality UI/UX that adapts well across screen sizes and device types.
• Comfortable working in CI/CD environments, using tools like Bitrise, CircleCI, GitHub Actions, or Azure DevOps.
• Hands-on experience with agile development practices, and a pragmatic approach to testing including unit, integration, and UI testing.

Nice To Have

• Experience working on sports, media, or gamification apps, particularly those with high user engagement or real-time data.
• Familiarity with live data integration, streaming APIs, or event-based user experiences.
• Personal passion or understanding of sports

Benefits

What can we offer you?

We offer a benefits package to suit you and your lifestyle! Out of a core monthly budget, you can choose your own comprehensive benefit package.

· Renowned Team Days often throughout the year

· Summer Away Days

· 23 standard days of holiday (+1 Birthday, +1 Well-being Day, +1 'Big Life Event', and +1 Admin Day), closure of office over Christmas (plus Bank Holidays)

· Discretionary Bonus based on company performance

· Performance Reviews every 6 months with discretionary salary increases

· Private healthcare (Vitality) and/or Health Care Plan (Medicash)

· Mobile phone contribution

· Sport Challenge contribution

· Gym membership contribution

· 2 x annual kit drops