Senior Mobile Developer

Black6; United Kingdom; On-site; GBP 70,000 - 90,000; Full time

Job summary

A leading tech company in Guildford is seeking a Senior Mobile Developer to enhance their Employee Experience App. You will lead the design and development of a cross-platform app using React Native, ensuring high performance and innovative features. The role comes with substantial benefits including flexible working arrangements, generous holiday, and a commitment to sustainability. Ideal candidates have extensive experience in mobile app development and strong React Native knowledge.

Benefits

Flexible work arrangements

25 days of holiday plus a birthday day off

Vitality life cover

Aviva pension scheme

Employee matching charity donation scheme

Qualifications

• At least 5 years’ experience in mobile app development.
• 3+ years experience with React Native.
• Experience with Expo and EAS.

Responsibilities

• Lead design and development of the mobile app.
• Integrate app with backend using RESTful and GraphQL APIs.
• Write clean and testable code.

Skills

Mobile app development experience

React Native

Expo and EAS experience

Performance optimization

Unit testing

E2E testing

Communication skills

AI in development

Mobile security risks

Swift/Kotlin knowledge

Job description

Job Purpose

As we continue to expand our market share in the rapidly emerging Employee Experience platform category, we are looking for a Senior Mobile Developer to help rebuild our market‑leading Employee Experience App and play a key role in an exciting new phase of development.

Main Responsibilities

In this role, you will lead the design, development, and maintenance of our cross‑platform mobile app using React Native. You will integrate the app with our backend product through RESTful and GraphQL APIs, ensuring seamless functionality and performance. Writing clean, well‑documented, and testable code (unit and integration tests) will be central to your work. Additionally, you will stay ahead of emerging technologies and mobile development trends, particularly within the fast‑moving React Native ecosystem, to keep our app innovative and competitive.

Requirements

• At least 5 years’ professional experience building mobile apps, including at least 3 years’ with React Native.
• Experience building apps using Expo and EAS.
• Understanding of performance optimization and profiling techniques.
• Understanding of React Native ecosystem, common libraries, patterns, and practices.
• Strong knowledge of React fundamentals (hooks, context, lifecycle etc).
• Complete understanding of build and distribution processes for iOS and Android.
• Expertise in unit testing and E2E testing of mobile apps.
• Understanding of how AI can be used to improve developer productivity, along with the benefits and risks involved.
• Knowledge of mobile security risks and development best practices.
• Ability to diagnose functional and non‑functional issues, including crashes.
• Excellent communication and collaboration skills.
• Passion for mobile app development underpinned by intellectual curiosity.
• Portfolio of relevant projects or contributions.
• Understanding of building and diagnosing web applications.
• Familiarity with using Swift/Kotlin to create native modules.
• Experience with branding/white‑labeling apps.
• Knowledge of OAuth and integrating with Identity Providers.
• Experience with Enterprise mobile solutions such as Intune MAM.

Why Work For Unily?

In addition to a generous base salary and discretionary company bonus, here are some things we think you’ll love:

Our awesome team culture.

We are focused on achieving results as a team and having fun while we do it.

Our industry leading product.

We are very proud of our ever‑evolving product, and we love using it internally and provide you and our clients at becoming an Unily expert.

Flexible that we offer.

Work from home can, we not only with hybrid basis and also recognize that life 9‑5 ­30 we want sustainable work/life balance.

Bright modern office spaces

When you need to be on office we want it to be like home, we have a well‑stock kitchen and the option to bring your dog to work.

Fantastic suite of benefits

Including 25 days holiday plus extra paid birthday day, Vitality life cover (health, sight, hearing and dental), Aviva pension (salary sacrifice scheme), life assurance, income protection and more.

Commitment to sustainability and giving back

We know working an organisation that takes environmental and social impact seriously to is the important, and we are proud to offer a fully paid volunteering day per year, an employee matching charity donation scheme and option to lease an electric vehicle through our salary sacrifice scheme.

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