Senior Software Engineer - Global Merchant Services Technology Sydney, NSW, Australia(Hybrid) Job Description As a Senior Software Engineer in Global Merchant Services Technology (GMST) you will be crafting solutions that are scalable and can be delivered iteratively to enhance business value, building core features and functions of card transaction systems on our distributed platform deployed in the cloud. Actively participating in agile teams and the latest development practices, writing code and unit tests, working with API specs and automation. Providing technical leadership to engineers to aid in the development of engineers within the team. GMST Engineers use Java Technologies to drive innovation while also finding opportunities to adopt new technologies. Are you looking to join a team of Engineers who not only write code and test but also innovate? If so, join our GMST team and work on the Merchant Platform! Responsibilities Mentor junior Software Engineers and cross-functional team of colleagues, fostering a culture of excellence and innovation Direct the design, development, testing, and deployment of software applications and systems Oversee a variety of tasks, platforms, and technologies to expand new and existing software to meet changing requirements Write automated unit tests to ensure correctness and stability Provide technical guidance to ensure adherence to best practices and coding standards Monitor software performance and implement improvements to optimize functionality Analyze technical challenges and provide innovative solutions to enhance software quality and efficiency Collaborate with cross-functional teams to ensure seamless integration and deployment of software solutions Collaborate and co-create effectively with teams in product and the business to align technology initiatives with business objectives Qualifications Degree in computer science, computer engineering or a related field. Significant hands-on experience in application architecture / design, software development, and testing, preferably in an Agile environment within a professional environment. Minimum 10 years of proven experience using Java, React, Vert.x, Spring, Spark, Postgres, Ignite, Restful APIs, Redis, Kafka. Strong engineering and professional leadership skills. Demonstrated ability to lead, partner, and collaborate multi-functionally across many engineering teams. At American Express, our culture is built on a 175-year history of innovation, shared values (https://www.americanexpress.com/en-us/company/who-we-are/) and Leadership Behaviors, and an unwavering commitment to back our customers, communities, and colleagues. From delivering differentiated products to providing world-class customer service, we operate with a strong risk mindset, ensuring we continue to uphold our brand promise of trust, security, and service. As part of Team Amex, you'll experience our powerful backing with comprehensive support for your holistic well-being and many opportunities to learn new skills, develop as a leader, and grow your career. Here, your voice and ideas matter, your work makes an impact, and together, you will help us define the future of American Express. We back you with benefits that support your holistic well-being so you can be and deliver your best. This means caring for you and your loved ones' physical, financial, and mental health, as well as providing the flexibility you need to thrive personally and professionally: 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 Offer of employment with American Express is conditioned upon the successful completion of a background verification check, subject to applicable laws and regulations. Job Info Job Identification 26007462 Job Category Technology Posting Date 05/11/2026, 07:08 AM Apply Before 06/09/2026, 01:55 PM Job Schedule Full time Job Shift Day Locations AMEX 12 Shelley Street, Sydney, NSW, 2000, AU(Hybrid) Career Area Technology