Senior Software Engineer I

checkout.com
London

Company Description

We’re Checkout.com . 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.

Job Description

Global payments are complex and ever-evolving. At Checkout 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 technology that enables 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 which focuses on building products to achieve the company's strategic goals. You’ll get to work with teams from across Checkout.com ’s portfolio of products and services who all have a real customer first philosophy.

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. We need our engineers to be versatile, display exceptional leadership qualities and be enthusiastic to take on new problems across the full-stack as we continue to push technology forward. With your technical expertise you will lead project priorities, deadlines, and deliverables. You will design, develop, test, deploy, maintain, and enhance software solutions.

What are we looking for:

  • 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

  • Someone who is AI proficient or AI curious, you will be hungry to embrace what the latest technology has to offer to enhance yours and your teams productivity

  • Payments or financial knowledge is a plus, but not a necessity

How you’ll make an impact:

  • Be part of, and collaborate with, cross-functional teams including product management, across a large engineering community.

  • Define and design loosely coupled, scalable systems in a wider microservices using industry best practices.

  • Stay up-to-date, use, and spread knowledge of the latest technologies used by Checkout.

  • 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

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 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

Posted 2026-07-18

Recommended Jobs

Maths - Outstanding School - Sutton

Marchant Recruitment
Sutton, Greater London

Full-time | Permanent | January 2026 Start | Salary: Paid To Scale An ambitious and inclusive 11–18 mixed secondary school in Sutton is seeking a dedicated and inspiring Maths Teacher to join thei…

View Details
Posted 2025-11-12

Global Consolidation Accountant - IFRS Expert (Hybrid)

Stratford, Greater London

Global Consolidation Accountant - IFRS Expert (Hybrid) Location: Glasgow Country: GB Company: The Travel Corporation Posted Date: 2026-08-11 Application Deadline: 2026-09-10 The…

View Details
Posted 2026-08-31

Class 2 (C) HGV Beavertail Driver

Flannery Plant Hire
Wembley, Greater London

Location: Luton or Wembley Join Our Team as a Class 2 (C) HGV Beavertail Driver – Be Part of Construction’s Future Flannery Plant Hire, a trusted name in operated and self-drive plant hire for…

View Details
Posted 2026-04-03

Head of Impact & Insights

Fairtrade Foundation
London

Be part of a global movement creating fairer trade and building a better future for people, planet and pay. We're looking for an inspiring and strategic Head of Impact & Insights to lead Fairtrade…

View Details
Posted 2026-08-22

Computer Science Teacher - Enfield Independent School

Marchant Recruitment
Enfield, Greater London

School Status & Location Sector: Leading Independent School (Digital Innovation Centre). Borough: Enfield (Outer London). Start Date: Permanent, full-time role commencing January 2026. …

View Details
Posted 2025-11-25

Year 2 Teacher | Outstanding School | Richmond | January...

Marchant Recruitment
Richmond, Greater London

Are you an experienced or newly qualified Year 2 Teacher seeking an inspiring new role from January 2026? Do you want to work in an Outstanding school in Richmond known for its creative curricul…

View Details
Posted 2025-10-09

HR Assistant - Bexley

Marchant Recruitment
Bexley, Greater London

A respected secondary academy in Bexley is seeking a proactive and organised HR Assistant to join their HR team ASAP . This is a full-time, permanent position providing administrative and operation…

View Details
Posted 2026-03-04