Senior Mobile Engineer

Checkout.com; Greater London; On-site; GBP 110,000 - 150,000; Full time

Job summary

United States Digital Space LLC in London seeks a senior mobile engineer to design and build high-performance mobile experiences used by millions. You’ll define architecture, lead technical discovery, and help shape the foundations of our consumer offering.

You will work with engineering and product teams, own features end-to-end, and mentor peers while contributing to the mobile strategy for a globally used platform.

Qualifications

• Solid background in mobile technologies (native iOS, native Android, or React Native).
• Proven track record building scalable and high-performance consumer mobile experiences.
• Experience delivering mobile apps or SDKs used by a large, active user base.

Responsibilities

• Architect and build the mobile experiences that are used directly by millions of consumers worldwide.
• Own feature development end-to-end, from discovery through to development, and monitoring through to maintenance.
• Work closely with backend teams to ensure underlying systems support mobile evolution.
• Mentor peers, review code, and contribute to the long-term technical vision for mobile development.

Skills

Mobile technologies

End-to-end feature ownership

Collaboration with backend teams

Code review & mentoring

Job description

Company Description

We’re the company. You might not know our name, but companies like eBay, Spotify, Klarna, Uber, and Sony do, because we’re behind many of the digital experiences you use every day.

We are where the world checks out, enabling over 10 billion transactions yearly for more than one billion global shoppers.

Whether you want to book a holiday, order food, renew a subscription, or check out online, there’s a good chance our tech powers the payments behind the scenes. Our platform helps the most ambitious businesses deliver effortless digital experiences, at scale.

If you want to do career-defining work, you’ve come to the right place. We move fast, think globally, and believe great teams are built by hiring exceptional people with conviction, curiosity, and the desire to make an impact.

With 20 offices across six continents and London as our HQ, we’re shaping the future of fintech – and we’re just getting started.

About the Role

the company is on a mission to transform the shopping experience for millions of consumers. As a senior individual contributor in mobile, you’ll help design and build the products we put in the hands of our end users.

Working hand-in-hand with our engineering team and product leaders, you’ll be crafting high-performance, user-friendly experiences, which operate at scale. Your role will extend beyond writing code - you’ll define architecture, lead technical discovery, and help us build the foundations that underpin our consumer offering.

What you’ll be doing

• Architecting and building the mobile experiences that are used directly by millions of consumers around the world.

• Owning feature development end-to-end, from discovery through to development, and monitoring through to maintenance.

• Working closely with backend teams to ensure the underlying systems we build are aligned to support our mobile product evolution.

• Championing best practices across the technical domain (testing, monitoring, release strategy, etc) to strengthen our foundations as we build our products.

• Mentoring peers, reviewing code, and contributing to the long-term technical vision for mobile development at the company.

Should have

• Solid background in mobile technologies (e.g. working with at least one of: native iOS, native Android, React Native)

• Proven track record building scalable and highly performant consumer experiences across the mobile domain

• Experience building and maintaining mobile apps or SDKs used by a large, active, user base.

• Passionate about developer experience - clear APIs, great docs, and reliability at scale.

• Excellent communication skills and experience collaborating with product, design, and backend peers.

Nice to have

• Previous experience in payments, fintech, or other security-sensitive domains.

• Exposure to PCI compliance, tokenization, or secure data handling.

Additional Information

Bring all of you to work

We create the conditions for high performers to thrive, through real ownership, fewer blockers, and work that makes a difference from day one.

Here, you’ll move fast, take on meaningful challenges, and be recognized for the impact you deliver. It’s a place where ambition gets met with opportunity, and where your growth is in your hands.

We work as one team, and we back each other to succeed. So whatever your background or identity, if you’re ready to grow and make a difference, you’ll be right at home here.

It’s important we set you up for success and make our process as accessible as possible. So let us know in your application, or tell your recruiter directly, if you need anything to make your experience or working environment more comfortable.

Life at the company

We understand that work is just one part of your life. Our hybrid working model offers flexibility, with three days per week in the office to support collaboration and connection.

Curious about what it’s like to be part of our team? Visit our Careers Page to learn more about our culture, open roles, and what drives us.

For a closer look at daily life at the company, follow us on LinkedIn and Instagram