Senior AI Engineer – Agentic AI

American Express; Greater London; On-site; GBP 110,000 - 150,000; Full time

Job summary

American Express is seeking a Senior AI Engineer – Agentic AI to join our Enterprise Technology Services team in the UK. You will turn complex problems into production-grade agentic systems that work with real financial data and meet regulatory requirements.

You'll shape solutions with product and design, build and ship production code, and own what you deliver after launch, including customer-facing LLM-powered features and internal AI capabilities that empower other engineers to work safely

Qualifications

• 5+ years in software engineering with production LLM/ML experience.
• Proven track record shipping AI-powered or agentic systems.
• Strong backend, APIs, data pipelines, and cloud infra fundamentals.
• Hands-on with modern LLM tooling and agentic patterns.
• Fluency in AI-assisted and agentic development workflows.
• Strong ownership, judgment, and ability to ship with ambiguity.
• Product-minded with customer focus.

Responsibilities

• Shape end-to-end AI features with product and design teams.
• Build and ship production code for agentic AI systems.
• Own delivery and post-launch performance.
• Develop customer-facing LLM-powered features and internal AI tools.
• Operate within regulated financial environment with compliance.

Skills

LLMs

Backend systems

APIs

Data pipelines

Cloud infrastructure

Agentic AI

Ownership mindset

Tools

LLM tooling

Job description

The Enterprise Technology Services organization partners with every part of the American Express business to power the company’s growth and innovation with trust and efficiency, and drive competitive differentiation with speed. We support the delivery and operations of technology, digital, and data capabilities, platforms, and services globally. Specifically, our team is responsible for the company’s technology engineering, architecture, and infrastructure, providing 24x7 support to ensure an uninterrupted, high-quality experience for customers and colleagues. We also provide product management for core enterprise platforms, and lead technology risk and information security, enterprise data governance and platforms, digital product and design, and enterprise AI platforms on behalf of the company.

At American Express, AI is reshaping the future of commerce and redefining the experiences our commercial customers and card members expect. Within Amex Technology, we are building platforms, products, and governance that enable agentic AI systems to operate responsibly and at scale across the enterprise.

Our focus is on agentic AI development: designing intelligent, adaptive systems that can plan, reason, and act across complex workflows with appropriate levels of autonomy. These systems power autonomous workflows, decision support, and customer-facing experiences—while meeting the high standards for security, explainability, reliability, and compliance required in financial services.

We partner closely with product, design, and business teams to deliver agentic capabilities that reduce operational friction, improve decision-making, and transform how customers interact, transact, and grow.

As a Senior AI Engineer – Agentic AI, you will be a core builder responsible for turning complex, ambiguous problems into production-grade agentic systems that operate on real financial data, serve real customers, and meet real regulatory requirements.

You will work end to end: shaping solutions with product and design, building and shipping production code, and owning what you deliver after launch. The scope of this role spans customer-facing LLM-powered features, agentic systems that automate financial workflows, and internal AI capabilities that enable other engineers to build with AI safely and efficiently.

This is not a research-only role. We are looking for engineers who are comfortable operating with autonomy, exercising sound judgment, and pushing the technical envelope within the realities of a regulated financial environment.

Minimum Qualifications:

• 5+ years of 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.

Preferred Qualifications:

• 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.