Senior Mobile Engineer - React Native

Flagstone Group LTD; City Of London; On-site; GBP 70,000 - 90,000; Full time

Job summary

A financial technology company in London is seeking a Senior React Native Engineer to lead software development projects. In this role, you'll collaborate within an Agile team to deliver high-quality applications while leveraging your extensive experience with React Native. The ideal candidate has strong communication skills, a proactive attitude, and is passionate about mentoring junior engineers.

Benefits

Competitive bonus scheme

Flexible benefits budget

Salary sacrifice options

Around the World scheme

Mental wellbeing support

Personal development budget

Private health care

Medical cash plan

Life insurance and Income Protection

Matched pension contributions

25 days holiday plus additional days

Qualifications

• 7+ years of experience in software development, specifically with React Native.
• Ability to design and maintain high-quality systems, including architecture.
• Experience working in Agile teams and mentoring junior engineers.

Responsibilities

• Play an active role in an Agile software team, fostering best practices.
• Deliver new features while ensuring software quality.
• Improve software engineering processes and influence architecture.

Skills

React Native

TypeScript

Testing tools (Jest, React Testing Library)

State management (Redux, RTK Query)

Storybook

Expo

Monorepo tools (Nx)

Emotional intelligence

Proactivity

Communication

Job description

Flagstone is many things. An online savings platform, reinventing how individuals, businesses, and charities manage, protect, and grow their cash. A diverse group of people, bound by a collaborative spirit, and shared purpose. And lastly, a thriving, profitable business – where smart people do their best work.

Each definition shares a common thread: our unique culture. It’s our pride and joy. And our competitive advantage.

A feel for our culture:

To revolutionise the savings market, we need to be at our best. But high performance takes more than talent – it takes a culture of kindness, respect, and growth.

That’s why we’re building a diverse, inclusive community, where your voice is heard and valued. Where, with close support and room to develop, you can surpass even your own expectations. And be rewarded for it.

We may not change the world, but we can change the world of financial technology. And all it takes is a winning mix of drive, talent, and empathy. Our culture celebrates all three.

Does this sound like you?

You’re a Senior React Native Engineer, ideally with 7+ years’ experience, who’s excited to forge a new way to save. You’ll have delivered on large scale projects of work, and will be excited about producing and maintaining high quality systems, including system design and architecture. You work in partnership with relevant teams across an organisation to identify how technology can solve business challenges and will be capable of answering “how and why” technology is designed and delivered.

What you’ll do:

As a Senior React Native Engineer, you will play an active role in an Agile software team, fostering best practice to ensure software quality. By being a subject matter expert in React Native, and through working collaboratively, you will get to work on new features and deliver a high quality, resilient application. You will always look to help improve the software engineering processes and practices, and to influence the software architecture.

What you’ll bring:

• Expert-level React Native skills – you know the framework inside and out.
• Proficiency in TypeScript – writing clean, maintainable code is second nature to you.
• Testing know-how – experience with tools like Jest, React Testing Library, and Detox or Maestro.
• State management expertise – familiarity with Redux, RTK Query, or similar
• Storybook experience – you understand the value of building and testing components in isolation.
• Expo familiarity – you’re comfortable using Expo and its suite of tools.
• Monorepo knowledge – experience with tools like Nx and working in a monorepo environment.
• Emotional intelligence – you actively listen and provide thoughtful solutions
• Proactivity – and the ability to demonstrate initiative positively and collaboratively
• Excellent verbal and written communication – with the ability to communicate technical information to both technical and non-technical stakeholders
• Ability and enthusiasm to coach and guide junior engineers

How we reward you:

At Flagstone, the benefits extend beyond false gifts like “fruit and snacks”. Instead, we invest in your health, wealth, and professional development. Here’s a selection of our benefits:

• Competitive bonus scheme - designed to reward and recognise high performance
• Flexible benefits budget - a pot to fund meaningful benefits for you, whether it's hormone or fertility testing, cancer screening, neuro-diversity coaching or something that matters for you.
• A range of salary sacrifice options to help you make tax efficient savings on electric cars, nursery schemes, home and tech goods.
• Around the World scheme - 3 months work from anywhere scheme
• Mental wellbeing support – Access therapy and mental health sessions through Spill
• Learning and development – £1,000 personal development budget to help you grow in your role.
• Private health care - Enjoy all the benefits AXA has to offer, including reduced gym memberships and medical history disregarded
• Medical cash plan - To help you with the costs of dental and optical expenses
• Life insurance and Income Protection- four times your annual salary for peace of mind
• Matched pension contributions up to 5%
• 25 days holiday - plus bank holidays, well-being days and volunteering days

All are welcome.

At Flagstone, we’re assembling a diverse team that defies our industry’s norms. Think this role could suit you? We encourage you to apply, no matter your background.