Senior Full Stack Software Engineer – Digital Banking

American Express

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

Posted 10/26/2026full-timeSunrise • Florida • United StatesSenior💰 $123,000 - $215,250 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in designing and implementing complex full-stack systems, with a strong focus on API design, domain-driven design, and multi-tenant architecture. Proven ability to mentor engineers and lead technical initiatives while ensuring high performance and reliability in production environments.

Highest-signal resume keywords

Java Or Kotlin ProgrammingAPI Design SkillsDomain-Driven DesignMulti-Tenant System DesignEvent-Driven Programming

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

JavaKotlinJavaScriptTypeScriptHTMLCSSReactDomain-Driven DesignAPI Contract TestingDistributed Systems Concepts

Soft Skills

Strong Written CommunicationStrong Verbal CommunicationMentoring EngineersTechnical Guidance

Tools & Technologies

Large Language Model Assisted DevelopmentCodexGitHub CopilotClaude Code

Industry Keywords

Multi-Tenant ArchitectureTenant IsolationOperational User InterfacesPerformance ImprovementsFault-Tolerant Services

Tech Stack

Tools & technologies

JavaJavaScriptKotlinReactTypeScript

About the role

Key responsibilities & impact

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 and separate business rules 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 accounting 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 testing strategies 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
Evaluate technology choices based on reliability, security, maintainability, developer productivity, and lifecycle cost
Write technical proposals and 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

Requirements

What you’ll need

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
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
Ability to benchmark systems, diagnose bottlenecks, and make evidence-based performance improvements
Experience designing or operating multi-tenant systems
Understanding of tenant-isolation models and shared, partitioned, and dedicated infrastructure trade-offs
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
Experience designing tenant-aware configuration, feature enablement, quotas, and lifecycle management
Experience preventing cross-tenant data exposure, resource contention, and configuration leakage
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
Hands-on experience with large language model assisted development workflows and coding agents such as Codex, GitHub Copilot, Claude Code, or comparable tools
Experience using agents for implementation, testing, debugging, refactoring, documentation, code analysis, and repetitive development tasks
Ability to review generated code for correctness, security, performance, maintainability, and architectural alignment
Understanding of common large language model failure modes
Experience protecting source code, customer data, credentials, and other sensitive information when using approved AI development tools
Ability to lead technical design for complex initiatives while remaining directly involved in implementation
Strong written and verbal communication skills
Experience mentoring engineers and improving designs, code, and operational practices
Experience documenting technical decisions
Employment eligibility to work with American Express in the United States is required; the company will not pursue visa sponsorship

Benefits

Comp & perks

Competitive base salaries
Bonus incentives
6% Company Match on retirement savings plan
Free financial coaching and financial well-being support
Comprehensive medical, dental, vision, life insurance, and disability benefits
Flexible working model with hybrid, onsite or virtual arrangements depending on role and business need
20+ weeks paid parental leave for all parents, regardless of gender, offered for pregnancy, adoption or surrogacy
Free access to global on-site wellness centers staffed with nurses and doctors (depending on location)
Free and confidential counseling support through our Healthy Minds program
Career development and training opportunities