Senior AI Engineer - Agentic AI

Salary: £55,000 - 90,000 per year

Requirements:

• Proven software engineering experience, including meaningful production experience with LLMs or applied ML systems.
• A track record of shipping AI-powered or agentic systems that real users depend on.
• Strong engineering fundamentals across backend systems, APIs, data pipelines, and cloud infrastructure.
• Hands-on experience with modern LLM tooling and agentic patterns and architectures.
• Fluency with AI-assisted and agentic development workflows.
• Strong sense of ownership and sound technical judgment.
• Comfort operating with ambiguity and turning it into shipped reliable product.
• A strong product mindset and customer orientation.
• Experience building agentic systems in fintech or other regulated industries.
• Experience as a founding engineer or early technical contributor in high-growth environments.
• Demonstrated ability to ship technically complex systems in regulated contexts that customers actively rely on.
• Meaningful open-source contributions, particularly in AI or developer tooling.
• Employment eligibility to work with American Express in the UK is required, as the company will not pursue visa sponsorship for these positions.

Responsibilities:

• Design, build, and ship LLM-powered and agentic product features that change how customers manage their finances.
• Build agentic AI systems that reason over context, invoke tools, take real actions, and recover gracefully from failure.
• Architect and implement production-grade RAG pipelines over sensitive financial data, with strict requirements for correctness, auditability, and safety.
• Contribute to shared AI infrastructure, including LLM services, agent orchestration frameworks, and evaluation and monitoring tooling, that scales agentic development across Amex Technology.
• Own the systems you build in production, including reliability, latency, cost, and failure modes.
• Work closely with product and design partners; engineers in this role are expected to think in terms of customer outcomes, not just technical execution.

Technologies:

• Agentic AI
• AI
• Architect
• Backend
• Cloud
• Support
• LLM
• RAG
• Security
• AWS
• GCP
• Python
• REST

More:

We are American Express, and our Enterprise Technology Services organization partners with every part of our business to power growth and innovation with trust and efficiency. We support the delivery and operations of technology, digital, and data capabilities, platforms, and services globally, with responsibility for technology engineering, architecture, infrastructure, product management for core enterprise platforms, technology risk and information security, enterprise data governance and platforms, digital product and design, and enterprise AI platforms. In this Senior AI Engineer – Agentic AI role, you will help build platforms, products, and governance that enable agentic AI systems to operate responsibly and at scale across the enterprise. We are focused on developing intelligent, adaptive systems that can plan, reason, and act across complex workflows while meeting the high standards for security, explainability, reliability, and compliance required in financial services. This is a hybrid, full-time role based in London or Burgess Hill, and we offer comprehensive support for your holistic well-being, opportunities to learn new skills, develop as a leader, and grow your career.

last updated 37 week of 2026