Sr Staff Software Engineer

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. Global Commercial Services (GCS) serves millions of business customers around the world, from mom-and-pop shops to approximately 70% of the S&P 500. We are the number one issuer of small business cards, the industry leader in corporate T&E and represent approximately 40% of the company’s total revenues. Our vision is to be essential to our customers’ businesses every day. We do that by offering a diverse suite of payment and cashflow tools our customers need to run and grow their businesses, from a wide range of traditional card products, to working capital and supply chain financing, to new digital solutions that make it easy for our customers to manage their financial and payment needs. We are looking for a Senior Staff Software Engineer to help shape the technical direction of our Business Line of Credit (BLOC) platform within Global Commercial Services (GCS). This is a highly hands-on engineering role for someone who enjoys solving complex problems, modernizing critical systems, and helping engineering teams build better software. The successful candidate will combine deep software engineering expertise with broad knowledge of modern architectures, public cloud, and enterprise technology platforms. They will work directly with engineers and technology leaders to modernize legacy systems and patterns, improve developer productivity, and raise the bar for engineering quality, reliability, and delivery. Key Responsibilities Design, build, and modernize critical software supporting BLOC, contributing directly to architecture, design, code, and implementation. Provide technical leadership across engineering teams, helping solve complex problems and establishing modern, reusable engineering patterns. Modernize legacy applications and architectures using cloud-native technologies, distributed systems, APIs, automation, and modern software development practices. Build deep knowledge of American Express technology platforms and tooling, helping teams effectively adopt enterprise capabilities while simplifying unnecessary complexity. Improve the reliability, availability, performance, and observability of critical systems through sound engineering practices, automation, and resilient design. Champion AI-enabled software development practices to improve developer productivity, software quality, testing, and delivery velocity. Lead technical experimentation and proofs of concept, using emerging technologies to solve engineering challenges and demonstrate better approaches. Partner across Engineering, Architecture, Product, and enterprise technology teams to influence technical direction and translate business needs into effective software solutions. Mentor engineers, share technical expertise, and raise engineering standards across the organization. Significant hands-on software engineering experience building and operating large-scale, business-critical applications. Strong programming and software design skills with the ability and desire to contribute directly to production software. Deep knowledge of modern software engineering practices, distributed systems, APIs, microservices, and highly available architectures. Strong public cloud fundamentals and experience designing, building, and operating cloud-native applications. Experience modernizing legacy applications, architectures, and engineering patterns while managing complexity and technical risk. Experience with modern engineering practices and tooling across CI/CD, automated testing, observability, infrastructure automation, and production operations. Experience applying AI-enabled tools and capabilities across the software development lifecycle to improve engineering productivity and quality. Demonstrated ability to diagnose and solve complex technical and production problems across application and platform layers. Broad technical curiosity with the ability to quickly learn new technologies, platforms, and enterprise tooling. Strong collaboration and communication skills with the ability to influence technical decisions, mentor engineers, and work effectively across engineering teams. Bachelor's degree in Computer Science, Computer Engineering, or equivalent experience. Employment eligibility to work with American Express in the U.S. is required as the company will not pursue visa sponsorship for these positions