RevTech
Senior AI Software Engineer – AI Centre of Excellence
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Fast-growing Global Fintech | London HQ (hybrid)
Salary: £80-100k
Location: London – 3 days p/w
Our client is a leading global payments platform, processing billions of transactions a year for some of the world's best-known digital brands. With a footprint spanning six continents and a reputation for moving fast and thinking big, they're now investing heavily in Generative AI to transform how the business operates — and they're looking for a Senior AI Engineer to help lead that charge.
This is a rare opportunity to join a newly established AI Centre of Excellence, working at the cutting edge of applied Generative AI within a high-scale, high-stakes fintech environment. You'll not only build and deploy AI solutions but help shape company-wide AI strategy and best practice.
The Role
As a Senior AI Engineer, you'll design, build, and deploy AI-driven solutions that enhance products and streamline operations, working closely with product, data science, and engineering teams. You'll also play a key role in mentoring peers and setting the technical direction for AI adoption across the business.
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Key responsibilities include:
- Partnering with cross-functional teams to identify and deliver high-impact Generative AI use cases
- Designing and building APIs and microservices that embed AI capabilities into core workflows
- Developing, fine-tuning, and deploying LLM-based applications (chatbots, assistants, knowledge extraction tools, etc.)
- Architecting scalable AI infrastructure on AWS, GCP, or Azure using containerisation and Infrastructure-as-Code
- Implementing CI/CD pipelines and secure, compliant AI deployment practices
- Building intuitive interfaces for teams to interact with AI-driven features
- Continuously optimising the performance, reliability, and scalability of AI systems
What You'll Bring
- Hands-on experience with LLMs (GPT, BERT, Llama, Gemini, etc.) applied to real-world problems
- Strong backend engineering skills, including RESTful APIs and microservices architecture
- Proficiency in Python and/or JavaScript, with familiarity in AI frameworks such as LangChain or PydanticAI
- Solid grounding in cloud computing (AWS, GCP, or Azure), Docker, Kubernetes, and Terraform
- Strong problem-solving ability and comfort operating in a fast-paced environment
- Excellent communication and cross-team collaboration skills
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Nice to Have
- C# or Java proficiency
- Frontend experience with JavaScript/TypeScript and React
- Experience fine-tuning and prototyping Generative AI applications
- Awareness of ethical AI practices and AI governance standards
- A track record of rapid prototyping with measurable business impact
- Experience with distributed systems and large-scale data processing
- Open-source contributions or a strong GitHub portfolio
- Prior experience in the payments industry (a strong plus)
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