Staff Software Engineer - Consumer

Company Description

We’re Checkout.com – you might not know our name, but companies like eBay, ASOS, Klarna, Uber Eats, and Sony do. That moment when you check out online? We make it happen.

Checkout.com is where the world checks out. Our global network powers billions of transactions every year, making money move without making a fuss. We spent years perfecting a service most people will never notice. Because when digital payments just work, businesses grow, customers stay, and no one stops to think about why.

With 19 offices spanning six continents, we feel at home everywhere – but London is our HQ. Wherever our people work their magic, they’re fast-moving, performance-obsessed, and driven by being better every day. Ideal. Because a role here isn’t just another job; it’s a career-defining opportunity to build the future of fintech.

Job Description

Checkout.com is on a mission to transform the shopping experience for millions of consumers. As one of our most senior individual contributors in this space, you’ll be instrumental in shaping the architecture and backend foundation of critical new offerings from the ground up. You’ll own pivotal technical decisions across our core services, ensure seamless integration between in-house systems and third-party providers, and work directly with the founding team to build something truly impactful.
 

What You’ll Do

• Design and guide the architecture of our platform: modular, secure, scalable, and maintainable from day one

• Define integration patterns across internal services and third-party providers

• Own key infrastructure choices (messaging systems, observability, deployment strategies, etc.)

• Collaborate closely with Product Managers, Designers, and Mobile Engineers to shape end-to-end journeys

• Be hands-on in code when needed, but primarily act as a technical force multiplier for the team

• Champion engineering best practices, security standards, and scalability patterns

• Mentor the early engineering hires and contribute to hiring plans

You Should Have

• Eight or more years' of backend engineering experience, with at least two years as a Staff or Principal Engineer

• You have a proven track record of building high-scale consumer systems, ideally with over 500,000 monthly active users.

• You bring experience from a regulated environment, with a strong preference for a background in fintech.

• You possess deep knowledge of cloud-native architectures (we use AWS) and are highly skilled in a either .NET or Java.

• You excel in API-first design, event-driven systems, service orchestration, and defining clean, clear contract boundaries.

• You are a strategic thinker who thrives on cross-functional collaboration to achieve outstanding results.

• You have a bias for simplicity and pragmatism, and you're driven to ship quickly without ever compromising on quality.

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 Checkout.com

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 Checkout.com, follow us on LinkedIn and Instagram