Summary: Seeking a passionate and highly skilled full stack senior engineer to build and scale next-generation customer- and agent-facing applications and mentor junior engineers. Highlights: 1. Opportunity to mentor junior engineers and make an impact on the industry 2. Design, develop, test, and deploy scalable and secure full stack applications 3. Collaborative culture where your voice is valued Amex GBT is a place where colleagues find inspiration in travel as a force for good and – through their work – can make an impact on our industry. We’re here to help our colleagues achieve success and offer an inclusive and collaborative culture where your voice is valued. We are looking for a passionate and highly skilled full stack senior engineer with strong technical depth and a keen interest to build and scale next\-generation customer\- and agent\-facing applications and have the opportunity to mentor junior engineers . This role blends hands\-on with team to design, develop, test, and provide production support for globally distributed, automated. The ideal candidate is comfortable diving deep into system design and implementation details. You will partner closely with Engineers, Product Managers, Architects, Data Scientists, and Operations teams to deliver scalable, reliable, and responsible products. This role operates in a fast\-paced, highly matrixed environment with geographically distributed teams and global technology partners. What You'll Do Ensure high standards of quality, reliability, security, and performance across traditional software components. Collaborate closely with Architecture and Data Platform teams to define technical principles, data strategy, and system foundations. Proactively identify risks and bottlenecks related to data dependencies, model performance, scalability, and production readiness, and drive cross\-functional resolution. Design, develop, test, and deploy scalable and secure full stack applications. Build and maintain backend services using Java and NodeJS in a microservices architecture. Develop intuitive and responsive user interfaces using React and JavaScript. Integrate and consume RESTful APIs and ensure efficient data flow between frontend and backend systems. Write reusable, testable, and efficient code in Python as needed for backend scripts or services. Implement secure authentication and authorization flows using OKTA integration (SAML). Participate in code reviews, design discussions, and contribute to team knowledge sharing. Troubleshoot and debug complex issues across the stack. Collaborate with DevOps for deployment, CI/CD pipelines, and monitoring. What We're Looking For 7–10 years of software engineering experience, with 2\+ years in a technical lead role. **Strong hands\-on experience in:** Java, and Spring framework Microservices architecture REST APIs and service integration Public cloud platforms (AWS) Hands\-on experience with ReactJS and modern JavaScript (ES6\+). Solid understanding of microservices architecture and design patterns. Experience building and consuming REST APIs. Experience with Python for backend scripting or service development. Proven experience integrating with OKTA or similar identity management providers. Strong understanding of secure coding practices and OAuth2/SAML flows. Familiarity with CI/CD tools, Git, and Agile development practices. Excellent problem\-solving, and teamwork skills. Excellent oral and written communication skills in English. **Nice to have:** Experience building or supporting systems that integrate with AI/ML components such as model inference services, data pipelines, or intelligent automation workflows is a plus. Familiarity with cloud\-native services. Experience in Expense Management and Travel industry domains. Knowledge of GoLang and Cloude code. Exposure to responsible AI practices, governance, or compliance considerations. Knowledge in AI/ML platforms or frameworks is a plus. Experience in NodeJS **Education:** * Bachelor’s or Master’s degree in Computer Science, Information Technology, or a related field. Location Mexico City, Mexico Click here to learn more about the benefits we offer in Mexico. The \#TeamGBT Experience **Work and life:** Find your happy medium at Amex GBT. Flexible benefits are tailored to each country and start the day you do. These include health and welfare insurance plans, retirement programs, parental leave, adoption assistance, and wellbeing resources to support you and your immediate family . **Travel perks:** get a choice of deals each week from major travel providers on everything from flights to hotels to cruises and car rentals. Develop the skills you want when the time is right for you, with access to over 20,000 courses on our learning platform, leadership courses, and new job openings available to internal candidates first. We strive to champion Inclusion in every aspect of our business at Amex GBT. You can connect with colleagues through our global INclusion Groups, centered around common identities or initiatives, to discuss challenges, obstacles, achievements, and drive company awareness and action. And much more! A ll applicants will receive equal consideration for employment without regard to age, sex, gender (and characteristics related to sex and gender), pregnancy (and related medical conditions), race, color, citizenship, religion, disability, or any other class or characteristic protected by law. Click Here for Additional Disclosures in Accordance with the LA County Fair Chance Ordinance. Furthermore, we are committed to providing reasonable accommodation to qualified individuals with disabilities. Please let your recruiter know if you need an accommodation at any point during the hiring process. For details regarding how we protect your data, please consult the Amex GBT Recruitment Privacy Statement . What if I don’t meet every requirement? If you’re passionate about our mission and believe you’d be a phenomenal addition to our team, don’t worry about “checking every box;" please apply anyway. You may be exactly the person we’re looking for!