Mobile Software Developer - Android / iOS

Grayce Group; Burgess Hill; Hybrid; GBP 35,000 - 55,000; Full time

Benefits offered by this job

Structured development

Career support

Project experience

Job summary

Grayce is recruiting a Mobile Software Developer for Android and iOS, based on-site in Burgess Hill, West Sussex. This full-time role focuses on developing and maintaining mobile applications within a collaborative engineering environment.

You will work with Kotlin, Java or Swift, integrate REST APIs, contribute to testing and CI/CD, and help enhance legacy code while delivering high-quality features. The position offers hands-on development, structured career support and real-world project

Qualifications

• Practical Android or iOS software engineering experience in a professional setting.
• Experience developing, testing, debugging and maintaining mobile apps.
• Proficiency with Kotlin, Java or Swift.
• Understanding of mobile app architecture and best practices.
• Experience contributing to mobile projects and integrating with codebases.

Responsibilities

• Develop, maintain and enhance Android applications and features.
• Deliver high-quality, reliable, and maintainable mobile code.
• Write, test and optimize code following modern mobile practices.
• Identify and resolve bugs and performance issues.
• Work with REST APIs and other services.
• Contribute to automated testing and CI processes.
• Improve performance and code quality of apps.
• Maintain and improve legacy applications when needed.
• Collaborate with engineers, QA, product and design teams.

Skills

Android development

iOS development

Kotlin/Java/Swift

REST APIs

Unit testing

Tools

Jetpack Compose

CI/CD pipelines

Git

Build tools

Job description

Mobile Software Developer – Android / iOS

Location: Burgess Hill, West Sussex - Full-time, on-site
Salary: £34,500–£55,000, dependent on experience, technical capability and evidence demonstrated throughout the recruitment process.

Take the next step in your mobile engineering career

Are you a Software Developer with hands-on Android or iOS engineering experience, looking to build on your technical expertise, work on exciting mobile applications and accelerate your career?

Grayce is recruiting Mobile Software Developers for an exciting opportunity focused on Android application development, based full-time in Burgess Hill, West Sussex.

You'll join Grayce as a Technology Consultant, working through one of our established consultancy partners to support a leading global financial services organisation within a large-scale technology environment.

This opportunity is ideal for someone who has already gained practical experience developing mobile applications, whether Android or iOS, and is ready to take on new technical challenges, contribute to meaningful projects and continue developing their expertise.

Alongside gaining valuable commercial experience, you'll benefit from the structured professional development, technical training and career support.

The opportunity

You'll join a collaborative engineering team responsible for developing, enhancing and maintaining mobile applications within a complex technology environment.

Working alongside experienced engineers, product owners, QA specialists and designers, you'll apply your existing mobile development experience while expanding your technical capabilities, particularly within Android engineering.

Your responsibilities could include:

• Developing, maintaining and enhancing Android applications, contributing to existing functionality and new features.
• Applying your mobile engineering experience to deliver high-quality, reliable and maintainable applications.
• Writing, testing and optimising code in line with modern mobile development practices.
• Identifying, investigating and resolving bugs, performance issues and technical challenges.
• Working with REST APIs and integrating mobile applications with wider technology services.
• Contributing to automated testing, unit and integration testing, and continuous integration processes.
• Supporting application performance improvements, optimisation and code quality.
• Working with existing codebases, including maintaining and improving legacy applications.
• Collaborating with engineers, QA, product and design colleagues to deliver effective technical solutions.
• Contributing ideas, sharing technical knowledge and supporting continuous improvement within the development team.

What we're looking for

We're looking for motivated Mobile Software Developers who have already gained hands‑on engineering experience and are ready to progress their careers within a challenging and supportive technology environment.

Essential experience and skills:

• Practical Android or iOS software engineering experience gained within a professional or commercial environment.
• Demonstrable experience developing, testing, debugging and maintaining mobile applications.
• Experience using relevant mobile development languages and frameworks, such as Kotlin, Java or Swift.
• A good understanding of mobile application architecture, development principles and software engineering best practices.
• Experience contributing to mobile development projects, working with existing codebases or delivering new application functionality.
• Familiarity with version control, testing methodologies and collaborative development practices.
• Strong analytical thinking and problem‑solving skills, with the ability to investigate and resolve technical challenges.
• Strong communication and collaboration skills, with confidence contributing within a technical team.
• A proactive approach to learning, taking ownership and developing your technical expertise.

Particularly advantageous:

• Commercial Android development experience using Kotlin or Java.
• Experience with Jetpack Compose or modern Android architecture.
• Familiarity with mobile CI/CD pipelines, automated testing and build tools.
• Experience working within agile development teams or large-scale technology environments.

We're particularly interested in candidates who can demonstrate the impact of their mobile engineering work, explain their technical contributions and show how their skills have developed through real‑world application development.

Right to Work Requirements

This requirement applies specifically to Grayce Consultant roles due to the nature of our client‑deployed model. Grayce does not have a sponsorship licence and is therefore unable to sponsor visa applications.

Due to the expected recruitment and onboarding timeline and the minimum two‑year programme commitment, you must have the right to work in the UK without requiring Grayce sponsorship at any point within the next 36 months.

Why Grayce?

At Grayce, we believe career development shouldn't stop once you've gained your first professional experience.

We support emerging professionals build on their existing capabilities, gain exposure to leading organisations and develop the technical and professional skills needed to progress their careers.

Through Grayce, you'll benefit from:

• Meaningful project experience: Contribute to technology initiatives within leading organisations, building valuable commercial and technical experience.
• Structured development: Access technical learning, professional qualifications and development opportunities aligned with your career progression.
• Career support: Benefit from ongoing guidance, coaching and support throughout your time on the programme.
• A collaborative community: Join a network of ambitious consultants, sharing knowledge and experiences.
• Long‑term progression: Continue strengthening your technical expertise and developing the skills to take on increasingly complex responsibilities.