Senior Software Engineer, AI Centre of Excellence
Checkout.com2 months ago
London, United KingdomSenior
Responsibilities
- Partner with product managers, data scientists, and engineers to research, validate, and deliver Generative AI use cases.
- Design and build APIs and microservices integrating AI capabilities into internal and external workflows.
- Develop, fine-tune, and deploy LLM-based applications such as chatbots, assistants, and knowledge extraction tools.
- Architect scalable AI infrastructure on AWS, GCP, or Azure using containerisation and Infrastructure-as-Code.
- Implement CI/CD pipelines and secure, compliant AI deployment practices.
- Build interfaces for teams to interact with AI-driven features.
- Optimise the performance, reliability, and scalability of AI systems.
- Mentor peers, establish engineering best practices, and contribute to Checkout.com’s AI strategy.
Requirements
- Hands-on experience with LLMs such as GPT, BERT, Llama, or Gemini and applying them to real-world problems.
- Strong backend engineering expertise, including RESTful API and microservices design.
- Proficiency in Python or JavaScript and familiarity with AI frameworks such as LangChain and PydanticAI.
- Understanding of cloud computing, Docker, Kubernetes, and Terraform.
- Strong problem-solving, communication, and cross-functional collaboration skills.
- Preferred: proficiency in C# or Java; frontend experience with JavaScript, TypeScript, and React; Generative AI application development and model fine-tuning; ethical AI and AI governance knowledge; rapid prototyping with measurable ROI; distributed systems and large-scale data processing experience; open-source contributions or a strong GitHub portfolio; and payments-industry experience.
Benefits
- Hybrid working model with three days per week in the office.
- Flexible and accessible working environment with support for workplace accommodations.
- Meaningful ownership, career growth opportunities, and recognition for impact.
Tech Stack
Categories
About Checkout.com
Checkout.com processes payments for thousands of companies that shape the digital economy. Our global digital payments network supports over 145 currencies and delivers high-performance payment solutions across the world, processing billions of transactions annually. In 2025, Checkout.com processed more than $300bn in ecommerce payments volume. We help enterprise merchants boost acceptance rates, combat fraud, and turn payments into a major revenue driver. Headquartered in London and with 19 offices worldwide, Checkout.com is trusted by leading brands such as Spotify, HelloFresh, eBay, Uber, Pinterest, Vinted, Klarna, Financial Times, and Sony. Checkout.com. Where the world checks out.