Mid-level Golang Engineer
checkout.com
London
Posted Aug 11, 2026
- Full-time
- All Departments
Job description
***Company Description***
*We’re*[**](http://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.*
**The role**
This role sits in our Payment Performance team - Payment performance means that we work to make payments have a higher probability of succeeding when they come through us -- thus ensuring higher revenues to all of our merchants. We do this by combining ML/RL and manual knowledge to make routing algorithms that modify a payment’s parameters in real-time. This makes for an exciting technical challenge: we have to combine high performance (<100ms), reliability (99.99%), and live machine learning, which requires us to be ahead of the market in terms of technology.
**How you’ll make an impact**
- Drive and support our software and infrastructure engineers working on proprietary algorithms
- Uphold high standards for our uptime and latency requirements while not sacrificing veracity of API responses
- Work with data scientists to make modifications to the platform and algorithms in order to achieve even better results
- Assist in hiring and developing like-minded engineers on the team
- Participate towards maintaining the team’s cohesion and healthiness
- Handle our incident response and post-incident investigation processes; participate in on-call rotations
- Make difficult choices in planning for the long term vision of our infrastructure and its quality while not overengineering.
- Maintain high quality standards and best practices for code, infrastructure and documentation
- Support the creation and maintenance of technical documentation
- Contribute to designing, developing, and delivering new features for our products
**What we’re looking for**
- Expert level experience with Golang
- Enthusiastic about delivery and experience working in a fast-paced environment
- Ability to adapt to new technologies quickly and understand the stakes in doing this
- Experience in designing and managing large, scalable, high throughput, and highly available systems
- Experience with AWS and its basic best-practice architectures
- Strong understanding and appreciation for software design and architecture
- Strong experience with microservice-based infrastructures
- Solid understanding of HTTP and GRPC
- Desire to work on an exciting product suite, within a fast scaling technical business
- Excellent practical knowledge of commonly used patterns in Golang
- Experience with Continuous Integration and Deployment workflows
- Excellent communication skills, ability to interact optimally with multidisciplinary teams
**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** [****](http://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](https://www.checkout.com/careers) to learn more about our culture, open roles, and what drives us.
For a closer look at daily life at [](http://Checkout.com), follow us on [LinkedIn](https://www.linkedin.com/company/checkout/life/) and [Instagram](https://www.instagram.com/checkout_com/)