Senior Software Engineer - Gen AI, Python

Joining Amex Tech means discovering and shaping your contribution to something big. Here, you can work alongside talented tech teams and build a unique career with the Powerful Backing of American Express. With a range of opportunities to work with the latest technologies, and a commitment to back the broader engineering community through open source, our mission is to power your success. Because Amex Tech is powered by our technology, our culture, and our colleagues.

The Technology organization enables and accelerates the company’s growth strategies, delivering global capabilities and services in support of Amex’s customers and colleagues, while maintaining 24/7 servicing and availability to ensure an uninterrupted, high-quality customer experience. Technology provides the foundation for everything we do in the company while driving differentiation through building and leveraging innovative technology and data insights.

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.

8+ 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.