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Sr Full Stack Software Engineer - Digital Banking

American Express
Sunrise, USA
Full-time
Senior
Hybrid
Discovered Today
javajavascriptkotlintypescript

Full Job Posting

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 assistance and work that requires direct investigation or human decision-making.
  • A disciplined approach to reviewing generated code for correctness, security, performance, maintainability, and alignment with system architecture.
  • An understanding of common large language model failure modes, including incomplete context, incorrect assumptions, insecure suggestions, and plausible but invalid output.
  • Experience protecting source code, customer data, credentials, and other sensitive information when working with approved artificial intelligence development tools.
  • The ability to create repeatable agent workflows and share effective practices with other engineers.
  • Accountability for all code and technical decisions produced with agent assistance.
  • Technical Leadership:
  • The ability to lead technical design for complex initiatives while remaining directly involved in implementation.
  • Strong written and verbal communication skills.
  • The ability to make trade-offs visible and help a team reach decisions.
  • Experience mentoring engineers and improving the quality of designs, code, and operational practices.
  • The judgment to choose established approaches when they fit and introduce new technology only when it produces a clear benefit.
  • The ability to work through ambiguity while keeping delivery, safety, and collaboration in balance.
  • Experience documenting technical decisions so that engineers outside the original discussion can understand the context and constraints.
  • The ability to identify risks early, challenge assumptions, and adjust an approach when evidence shows that it is not working.
  • Employment eligibility to work with American Express in the United States is required as the company will not pursue visa sponsorship for these positions.

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.

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