Senior Software Engineer II, Integration Team

checkout.com
Paris

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.

Join us at ProcessOut

ProcessOut is a pioneer in the payment orchestration space. We are on a mission to help merchants build, scale and optimize their payment infrastructure. We work to bring simplicity, flexibility & performance to payments.

Millions of transactions are routed via ProcessOut everyday for merchants all over the world. We are proud to partner with amazing merchants like Glovo, Bolt, Sainsbury’s, Dott, Rakuten and many more!

We were acquired by Checkout.com in 2020 with the goal of growing our global reach.

If you are looking to join a very fast-moving company with passionate, hard-working & fun teams, ProcessOut is for you! At ProcessOut, we are looking for people who are convinced they can play a central part in the Company's success! We are looking for people who are passionate, who are looking to achieve their full potential & who will actively contribute to strengthen the links between our teams. We value people that fully own their work and are passionate about building the next generation of online payments with us.

Software Engineering at ProcessOut:

We are a self-sufficient team that operates in a fully agile way.

When it comes to technical stack, we are hosted in AWS , use EKS and our primary development language is Go . As we always strive to use the best tool for the job, we use a combination of Redis , DynamoDB and Postgres for persistence layer, and REST , gRPC and queues for communication.

We are experiencing constant growth in the number of transactions handled, new clients, and integrations. That’s why we pay very close attention to elegant design and scalability of the platform. We are looking for dedicated engineers who would like to join us on our journey.

About you

  • At least 5 years of experience in software development in Golang

  • Know your way around web-related tech ( TLS, proxies, API conventions...)

  • Have had experience in building technical frameworks that handles critical flows

  • Able to communicate with third-party providers from both a technical perspective and business

  • Be product minded

  • Always curious and passionate about understanding the business

  • Have worked in financial services

  • Have experience mentoring software engineers, and ambition to become manager

Nice to have

  • Payment knowledge around Cards or Alternative Payment Methods

What you will be doing

  • Working within our Integration team to deliver new API connections with Payment Service Providers, maintain existing integrations, and help evolve the platform by implementing new functionalities and optimizing performance.

  • Contributing to services and overall architecture by discussing technical solutions, proposing enhancements, and actively contributing to our codebases.

  • Build the technical vision of our payment framework with the goal of maximizing quality and velocity of the team

  • Own the product vision to help on designing, building, and releasing new features

  • Participating in our on-call paid rotation

  • Mentor and manage software engineers

If you don't meet all the requirements but think you might still be right for the role, please apply anyway. We're always keen to speak to people who connect with our mission and values.

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

Publié le 2026-07-03

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