Sr Staff Software Engineer - Global Commercial Services

American Express is a company with a rich history of innovation and a commitment to supporting its customers and colleagues. They are seeking an experienced Staff Engineer to provide technical leadership across multiple teams, mentor engineers, and ensure the delivery of high-quality systems for their expense management platform.

Responsibilities:

• Lead the technical direction for complex projects and systems, ensuring scalability, maintainability, and reliability
• Mentor engineers across multiple teams, guiding them through design reviews, code reviews, and career development
• Collaborate with engineering leaders, product managers, and designers to shape product strategy and execution
• Drive architectural decisions, propose and implement improvements to system performance, scalability, and developer productivity
• Contribute to key system components across the stack—front end, back end, and infrastructure—based on priority and team need
• Uphold and champion Center’s engineering best practices, including CI/CD (GitHub Actions), testing, observability, and version control (Trunk based)
• Partner with stakeholders to identify and resolve technical debt, improve code quality, and reduce operational overhead
• Investigate and resolve complex technical and performance issues using monitoring tools such as Datadog

Requirements:

• 8+ years of professional experience in software engineering, with demonstrated impact in senior or staff-level roles
• Deep expertise in at least one area of the stack (backend systems, frontend architecture, infrastructure) and solid working knowledge across the others
• Proven experience designing and maintaining distributed, event-driven systems using Kafka, SQS, S3, Lambda, Step Functions, and other serverless technologies
• Proficiency with modern Go, JavaScript/TypeScript, NextJS, and React
• Experience with modern communication protocols such as tRPC, gRPC, and websockets
• Strong understanding of SQL and relational databases, ideally with experience using CockroachDB
• Experience with ECS and Kubernetes for deploying and scaling containerized applications
• Experience with analytical databases such as ClickHouse or Tinybird
• Strong testing mindset with experience in unit, integration, and end-to-end test development using Go Test, and related tools
• Demonstrated ability to lead by influence and communicate complex technical concepts clearly across diverse stakeholders
• Experience working in a fast-paced, high-accountability environment with a strong culture of ownership
• Experience working in real-time financial or expense management applications
• Familiarity with feature flagging and observability tools such as LaunchDarkly
• Experience working at an enterprise-scale organization