Senior Full-Stack Software Engineer

Sr Full Stack Software Engineer - Digital Banking

Sunrise, FL, United States

(Hybrid)

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Job Description

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.

The U.S. Consumer Services and Membership Digital Experiences Technology team (USCDT) brings together foundational strategic technology capabilities in digital experience engineering (Mobile and Web), marketing and advertising technology, enterprise communications, travel and lifestyle, and dining technology. It employs a ground-breaking focus with development responsibilities for customer-facing capabilities that deepen and expand digital engagement, as well as core technical capabilities that cut across business lines and customer segments.

Joining the Digital Banking technology team means shaping secure, scalable, and resilient banking capabilities that support customer-facing financial experiences. In this role, you will apply deep backend engineering expertise across the software development lifecycle while partnering with product, architecture, operations, and business stakeholders to deliver high-quality platform services.

Control Tower builds mission-critical tools that help our payment platforms operate safely and efficiently. Our platform supports the development and operation of the next generation of American Express financial products.

We are hiring a Senior Full-Stack Software Engineer to design and deliver capabilities across backend services, APIs, developer tooling, and operational user interfaces. You will work on a shared platform that serves multiple products and tenants, each with distinct data, configuration, access, and operational requirements.

This is a hands-on engineering role. You will lead the technical design and delivery of complex initiatives, contribute to platform direction, mentor other engineers, and improve the standards and tooling used by the team.

Control Tower builds mission-critical tools that help our payment platforms operate safely and efficiently. Our platform supports the development and operation of the next generation of American Express financial products.

We are hiring a Senior Full-Stack Software Engineer to design and deliver capabilities across backend services, APIs, developer tooling, and operational user interfaces. You will work on a shared platform that serves multiple products and tenants, each with distinct data, configuration, access, and operational requirements.

This is a hands-on engineering role. You will lead the technical design and delivery of complex initiatives, contribute to platform direction, mentor other engineers, and improve the standards and tooling used by the team.

Responsibilities

What you will do:

• Lead the design and implementation of full-stack platform capabilities, including domain models, backend services, APIs, and operational user interfaces.

• Use domain-driven design to identify bounded contexts, define clear ownership, and keep business rules separate from infrastructure concerns.

• Design APIs with clear contracts, consistent resource models, predictable error handling, idempotency, versioning, and backward compatibility

• Design multi-tenant capabilities with explicit boundaries for data, identity, configuration, workloads, and resource consumption.

• Address tenant isolation, authorization, noisy-neighbor risks, quotas, tenant-aware observability, and safe tenant onboarding and migration.

• Build distributed and event-driven systems that account for concurrency, ordering, consistency, retries, backpressure, partial failure, and delivery semantics.

• Create processing and visualization components for real-time operational analysis.

• Build accessible, responsive, and performant interfaces for operators and internal platform users.

• Own services through production, including instrumentation, service-level objectives, capacity planning, incident response, and remediation.

• Define an appropriate testing strategy across unit, integration, API contract, end-to-end, performance, and resilience testing.

• Improve build, test, deployment, and release tooling through the continuous integration and delivery pipeline.

• Use and improve large language model assisted development workflows to accelerate implementation, testing, debugging, documentation, and technical analysis while maintaining engineering, security, and review standards.

• Evaluate technology choices based on reliability, security, maintainability, developer productivity, and lifecycle cost.

• Write technical proposals and clearly explain architectural decisions, constraints, and trade-offs.

• Mentor engineers through design reviews, code reviews, pairing, and technical guidance.

• Work with product, operations, security, and engineering partners to turn business requirements into deliverable technical outcomes.

• Take ownership of complex work and drive it to completion when requirements are incomplete or evolving.

Qualifications

• Architecture and backend engineering

• A track record of designing and delivering complex production systems as a senior engineer.

• Strong experience with Java or Kotlin and the JVM ecosystem.

• Experience with asynchronous, reactive, or event-driven programming.

• Practical knowledge of domain-driven design, including bounded contexts, aggregates, domain services, domain events, and integration between domains.

• Strong API design skills, including HTTP semantics, schema design, compatibility, idempotency, pagination, error models, and contract testing.

• A sound understanding of distributed-systems concepts such as consistency, availability, partitioning, concurrency, ordering, retries, and failure recovery

• Experience building fault-tolerant and horizontally scalable services.

• Experience with data modeling, transactions, caching, schema evolution, and safe data migrations.

• The ability to benchmark systems, diagnose bottlenecks, and make evidence-based performance improvements.

• Multi Tenant Platform Engineering

• Experience designing or operating systems that serve multiple tenants, products, or business units.

• An understanding of tenant-isolation models and the trade-offs between shared, partitioned, and dedicated infrastructure.

• Experience enforcing tenant context across APIs, data access, background processing, events, caches, logs, and metrics.

• Knowledge of identity, authentication, authorization, least privilege, and auditable access in multi-tenant systems.

• Experience designing tenant-aware configuration, feature enablement, quotas, and lifecycle management without creating tenant-specific forks.

• The ability to balance shared platform capabilities with the needs of individual products.

• Experience identifying and preventing cross-tenant data exposure, resource contention, and configuration leakage.

• An understanding of how tenant boundaries affect deployment, migration, monitoring, support, and incident response.

• Frontend engineering

• Strong JavaScript or TypeScript, HTML, and CSS skills.

• Experience building production applications with React or a comparable component-based framework.

• Experience with client-side architecture, state management, data fetching, error handling, and frontend testing.

• Knowledge of semantic HTML, accessibility, responsive and adaptive design, and browser performance.

• The ability to turn complex operational data into clear and usable interfaces.

• Experience designing interfaces for real-time data, degraded states, partial results, and operational errors.

• AI assisted engineering

• Hands-on experience with large language model assisted development workflows and coding agents such as Codex, GitHub Copilot, Claude Code, or comparable tools.

• The ability to give agents clear context, constraints, acceptance criteria, and verification steps for complex engineering work.

• Experience using agents for implementation, testing, debugging, refactoring, documentation, code analysis, and repetitive development tasks.

• The judgment to identify work that benefits from agent assis