Senior Software Engineer

Company Overview

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. A role here isn’t just another job; it’s a career‑defining opportunity to build the future of fintech.

Role Overview

Global payments are complex and ever‑evolving. At Checkout.com, our software engineers develop the next‑generation payments technologies that enable our merchants to boost their acceptance rates, cut processing costs, fight fraud, and create cutting‑edge solutions that enable extraordinary customer experiences. We’re looking for senior software engineers who bring fresh ideas, have a curious nature, and are passionate about working in an engineering environment that focuses on building products to achieve the company’s strategic goals.

As a Senior Software Engineer, you will lead and drive specific projects critical to Checkout’s needs, with opportunities to switch teams and projects as you and our fast‑paced business grow and evolve. You will design, develop, test, deploy, maintain, and enhance software solutions across the full stack while guiding project priorities, deadlines, and deliverables.

Responsibilities and Impact

• Define and design loosely coupled, scalable systems in a microservices architecture using industry best practices.
• Stay up‑to‑date with, use, and spread knowledge of the latest technologies used by Checkout.com.
• Write clean, maintainable, extendable, and testable code on some of Checkout’s most impactful systems.
• Build, own, and operate your systems to the highest levels of resilience and service.
• Mentor junior team members and assist in their technical development.
• Collaborate with cross‑functional teams including product management across a large engineering community.

Qualifications

• Bachelor’s or Master’s degree in Computer Science, Engineering, or related field.
• Proficiency in C#.NET, Java, or Go, with a strong understanding of software development principles in either a backend or full‑stack environment.
• Great communication skills and ability to interact effectively with a wide range of stakeholders.
• Experience working in agile environments and delivering high‑quality code within tight deadlines.
• Excellent problem‑solving skills and the ability to work independently as well as part of a team.
• AI proficiency or curiosity is a plus; a appetite to embrace what the latest technology has to offer to enhance your and your team’s productivity.
• Payments or financial knowledge is a plus but not required.

Benefits and Culture

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.

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. We’re committed to setting you up for success and making our process as accessible as possible. If you need anything to make your experience or working environment more comfortable, please let us know.

Life at Checkout.com is balanced. Our hybrid working model offers flexibility, with three days per week in the office to support collaboration and connection.