Senior Software Engineer, Checkout.com
AI Centre of Excellence
3+ days a week in office
Payment services to power performance
Be an early applicant
Payment services to power performance
1001+ employees
Be an early applicant
3+ days a week in office
1001+ employees
Company mission
To help businesses thrive in the digital economy.
Role
Who you are
- Hands-on experience with LLMs (e.g., GPT, BERT, Llama, Gemini) and applying them to real-world problems
- Strong backend engineering expertise, including RESTful APIs and micro-services design
- Proficiency in Python/JavaScript and familiarity with AI frameworks (e.g., LangChain, PydanticAI)
- Solid understanding of cloud computing (AWS, GCP, or Azure), containerisation (Docker, Kubernetes), and Infrastructure-as-Code (Terraform)
- Proven problem-solving skills and ability to thrive in fast-paced environments
- Excellent communication and collaboration skills across diverse teams
Desirable
- Proficiency in C# or Java
- Frontend development experience with JavaScript/TypeScript and frameworks such as React
- Experience developing Generative AI applications, including model fine-tuning and prototyping
- Awareness of ethical AI practices and emerging standards in AI governance
- Track record of rapid prototyping with measurable ROI
- Familiarity with distributed systems and large-scale data processing
- Contributions to open-source projects or a strong GitHub portfolio
- High technical curiosity and eagerness to learn new platforms
- Experience in the payments industry (a strong plus)
What the job involves
- As a Senior AI Engineer within Checkout.com’s AI Centre of Excellence, you will drive the adoption of cutting-edge Generative AI technologies to transform how we operate and innovate
- You will mentor peers, set engineering best practices, and shape Checkout.com’s AI strategy, while also designing, building, and deploying AI solutions that enhance products and streamline business processes in collaboration with cross-functional teams
- Partner with product managers, data scientists, and engineers to research, validate, and deliver high-impact Generative AI use cases
- Design and build APIs and microservices that integrate AI capabilities into internal and external workflows
- Develop, fine-tune, and deploy LLM-based applications (e.g., chatbots, assistants, knowledge extraction tools)
- Architect scalable AI infrastructure on cloud platforms (AWS, GCP, or Azure), leveraging containerisation and IaC
- Implement CI/CD pipelines and enforce best practices for secure, compliant AI deployment
- Build intuitive interfaces that enable teams to interact effectively with AI-driven features
- Continuously optimise performance, reliability, and scalability of AI systems
Salary benchmarks
Our take
The payments industry has exploded in the last decade as eCommerce continues to grow as the use of cash falls. Checkout.com is building the go-to platform for all things related to payments, such as accepting transactions, processing them and detecting fraud. Its secured a steady stream of funding from top investors like Tiger Global Management, and is the strategic payments partner for some of the best known fast-moving brands globally such as Patreon, Dashlane, Udacity, Wise, Sony Electronics, and Klarna.
It focuses on large merchants and try to make its product as customisable as possible, so that companies integrate Checkout.com as an infrastructure partner in their product. This increases the stickiness of the product and creates many opportunities for the company to generate revenue.
Checkout.com has high quality proprietary technology (its platform has been designed from the outset so it can easily deliver incremental services as it expands its offering) and claim to offer the most comprehensive cross-border payment solution for digital commerce.
Kirsty
Company Specialist at Welcome to the Jungle
Insights
Company
Employee endorsements
People of all backgrounds are welcomed
"DEIB is where Checkout.com takes it to the next level. This company is excellent at building a sense of belonging and celebrating people from all..."
Funding (last 2 of 4 rounds)
Jan 2022
$1bn
SERIES D
Jan 2021
$450m
SERIES C
Total funding: $1.8bn
Company values
- Aspire: With big dreams and a long-term focus, we embrace ambition, driving our Aspire value
- Excel: By constantly pushing ourselves and each other to do our best work, we embody the spirit of Excel
- Unite: We come together as one team, rallying to make wins happen, forming the foundation of our Unite value
Company HQ
London, UK
Articles
Leadership
Guillaume Pousaz
(Founder & CEO)Previously founded NetMerchant, which sold European currencies to US merchants. Background in mathematical engineering.
People progressing
First joined as a Software Engineer, was promoted to Senior Software Engineer after 1.5 years and was then promoted to Engineering Lead 6 months later. Ignas is now a Senior Engineering Manager.
Diversity, Equity & Inclusion at Checkout.com
- Our IT Infrastructure Engineer, Sheryl Lingachetti, spoke to Zoë Schulz from myGwork - LGBTQ+ professionals & allies about trans rights in Mauritius, allyship and the support she has found in her workplace community 🏳️⚧️👇 https://www.attitude.co.uk/life/business/it-engineer-sheryl-on-coming-out-at-work-support-improves-productivity-for-everyone-442696/
- CTRL-ALT-CONNECT is Tech's latest community 🔥 We've partnered with our friends at Wise to create an inclusive community for people in tech to connect over conversation, networking and drinks. Last week we hosted our first panel discussion in our London office, which centred on the topic of Growth. https://www.linkedin.com/posts/checkout_tech-community-activity-7071841326060720129-qDOt?utm_source=share&utm_medium=member_desktop
- Our Pride Community provides a safe and welcoming space for our LGBTQIA+ colleagues and allies to connect, learn, and advocate for change. https://www.linkedin.com/posts/checkout_lifeatcheckout-activity-7074738991102611457-u7v5?utm_source=share&utm_medium=member_desktop
- Our Pride Community spoke with Adel Naamneh, VP of Solutions Engineering to learn about their experiences of being a member of LGBTQIA+ community and the importance of having corporate responsibility on hiring a diverse work force: https://www.youtube.com/watch?v=k0e9WUmNdVk&t=561s
- Read an interview hosted by The Black Young Professionals Network with the leaders of our Black Community: https://byp-network.com/news/314821
- Read more about the 'FinTech for all' charter, of which we were a founding signatory. The charter aims to create a speak up culture across FinTech, eliminating harassment and bullying: https://fintech.inchorus.org/
- Read this inspiring interview hosted by SheCanCode and one of our female QA Engineers: https://shecancode.io/blog/victoria-santiago-qa-engineer
- Our Principal Product Manager Yasmin, also sat down with SheCanCode on two inspiring articles: https://shecancode.io/blog/meet-yasmin-christie-checkout-principal-product-manager-an-inspirational-tech-career-journey and https://shecancode.io/blog/14-pieces-of-practical-product-management-guidance-from-checkout-part-2
- Plus, our Senior Engineering Manager Marina tells her story with SheCanCode: https://www.shecancode.io/blog/how-to-get-the-best-from-your-team-and-your-own-career-from-one-of-checkouts-engineering-leads
- And finally, our Graduates share some insights too: https://www.shecancode.io/blog/grad-programme-insider-tips-from-checkout
- Find out more information at our Diversity and Inclusion webpage: https://www.checkout.com/diversity-and-inclusion
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