Software Engineer III

You Lead the Way. We’ve Got Your Back.

With the right backing, people and businesses have the power to progress in incredible ways. When you join Team Amex, you become part of a global and diverse community of colleagues committed to backing our customers, communities, and each other.

Here, you’ll grow your skills, make an impact, and shape a career journey that’s uniquely yours—with benefits, flexibility, and support that help you thrive personally and professionally.

At American Express, you’ll be recognized for your contributions, leadership, and innovation. Together, we’ll win as a team—upholding our values and delivering the world’s best customer experience every day. And we’ll do it with integrity, in an environment where everyone is seen, heard, and feels they belong.

Join Team Amex and let’s lead the way together.

About our Team and Product

One Data

In 2025, we saw tremendous growth in adoption, with hundreds of new functions onboarded—and we expect that growth to continue and accelerate. The One Data engineering team is responsible for platform development, developer experience, and production support, collaborating closely with SRE and product engineering teams across the company.

We build for developers, by developers—championing open standards, developer productivity, and excellence in cloud-native architecture.

The Role

Software Engineer

You’ll design, develop, and support core components of the One Data platform, working with modern technologies and collaborating with talented engineers who care deeply about craftsmanship, performance, and reliability.

What You’ll Do

• Design, implement, and optimize high-performance FaaS components in Java or Kotlin.
• Partner with SREs and developers to deliver resilient, observable, and scalable systems.
• Improve developer experience through tooling, documentation, and automation.
• Drive platform adoption, performance tuning, and continuous improvement.
• Mentor engineers, contribute to internal tech guilds, and promote engineering best practices.
• Advocate for open-source principles and contribute back to the community.

What You Bring

Technical Expertise

• Strong hands-on experience in

  Java

   (Collections, Streams, Lambdas, Exceptions).
• Proficiency with

  asynchronous and concurrent programming

   – Executors, Futures, CompletableFutures, or Kotlin Coroutines.
• Experience with

  Reactive frameworks

   –

  Vert.x

   (preferred), Spring Reactive, RxJava, Netty, or Akka.
• Proven experience designing and building

  RESTful microservices

  ; exposure to SOAP or gRPC is a plus.
• Experience with build tools (

  Gradle

   preferred,

  Maven

   acceptable).
• Solid understanding of

  unit testing frameworks

   (JUnit, Cucumber, or equivalent).
• Expertise in

  system design

  ,

  performance tuning

  , and

  production diagnostics

   (heap/thread dumps, JConsole, JMC).
• Working knowledge of

  source control systems

   (Git or equivalent) and conflict resolution.
• Familiarity with

  containerization and orchestration tools

   (Docker, Kubernetes).
• Exposure to

  messaging systems

   such as Kafka or RabbitMQ is a plus.
• Bonus: Knowledge of

  Virtual Threads (Java 21+)

  ,

  micro-benchmarking (JMH)

  , or emerging languages such as

  Go

  ,

  Rust

  , or

  WebAssembly (WASM)

  .

Mindset & Collaboration

• Passion for technology and continuous learning—engaged in the broader developer ecosystem (CNCF, open source, tech communities).
• Action-oriented and adaptable; thrives in a dynamic, fast-changing environment.
• “Manager of one” mindset—takes ownership, drives clarity, and executes independently.
• Empathetic communicator who

  disagrees respectfully and commits

   to team goals.
• Enthusiastic about

  developer experience

   and improving how others build software.
• Committed to mentorship, collaboration, and contributing to Amex’s technology guilds.
   

Qualifications

• 5+ years of professional software development experience.
• 4+ years of experience with

  Java, Kotlin

  , or similar object-oriented languages.
• 2+ years’ experience with at least one other modern language (

  Go, Python, Node.js, Rust

  ).
• Demonstrated expertise in designing, developing, and testing enterprise-grade APIs.
• Experience with

  relational or NoSQL databases

  , schema design, and performance optimization.
• Familiarity with

  public cloud platforms

   (AWS, GCP, or Azure).
• Strong analytical and troubleshooting skills; able to decompose complex systems.
• Excellent written and verbal communication skills.
• Bachelor's degree in computer science, Computer Engineering, or equivalent; advanced degree preferred.
  

• Competitive base salaries 
• Bonus incentives 
• Support for financial-well-being and retirement 
• Comprehensive medical, dental, vision, life insurance, and disability benefits (depending on location) 
• Flexible working model with hybrid, onsite or virtual arrangements depending on role and business need 
• Generous paid parental leave policies (depending on your location) 
• 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