FLEX Senior Software Engineer

JOB SUMMARYWe are seeking a highly motivated FLEX Senior Software Engineer to drive performance optimization and scalability across enterprise APIs and platform services. This role focuses on ensuring reliability under high load, identifying performance bottlenecks, and implementing proactive monitoring and tuning strategies. The ideal candidate will partner with cross-functional teams to deliver efficient, scalable, and high-performing digital solutions while continuously improving engineering practices and system performance.CANDIDATE PROFILE Education and ExperienceRequiredBachelor’s degree in computer science, Information Technology, or equivalent experience7+ years of experience working on large-scale distributed or API-based systems using cloud based (AWS/GCP) architecture.Strong expertise in performance testing tools (NeoLoad, JMeter, Locust, K6) and monitoring platforms (Dynatrace, Prometheus, etc.)PreferredFamiliarity with CI/CD pipelines and DevOps-integrated performance testingKnowledge of GraphQL, distributed systems, or resilience testing practicesCORE WORK ACTIVITIESServe as a performance engineering expert ensuring scalability, reliability, and efficiency of APIs and platform servicesConduct performance testing, profiling, benchmarking, and tuning across distributed systems Analyze production performance issues and provide actionable optimization recommendations Design and implement performance frameworks, monitoring strategies, and dashboards Collaborate with product, architecture, and engineering teams to improve end-to-end performance Identify system bottlenecks, latency issues, and scalability risks across platform services Develop and maintain automation scripts for performance testing and analysis Drive performance best practices and provide technical guidance across teams Mentor team members and promote performance engineering knowledge sharing Partner with infrastructure and application teams to optimize performance and support production environments Ensure adherence to IT governance, standards, and performance engineering processes Escalate risks and proactively communicate performance-related concerns to stakeholdersAt Marriott International, we are dedicated to being an equal opportunity employer, welcoming all and providing access to opportunity. We actively foster an environment where the unique backgrounds of our associates are valued and celebrated. Our greatest strength lies in the rich blend of culture, talent, and experiences of our associates.  We are committed to non-discrimination on any protected basis, including disability, veteran status, or other basis protected by applicable law. All locations offer 401(k) plan, stock purchase plan, discounts at Marriott properties, commuter benefits, employee assistance plan, and childcare discounts. Benefits are subject to terms and conditions, which may include rules regarding eligibility, enrollment, waiting period, contribution, benefit limits, election changes, benefit exclusions, and others. Click here to learn more. Full-time positions also offer coverage for medical, dental, vision, health care flexible spending account, dependent care flexible spending account, life insurance, disability insurance, accident insurance, adoption expense reimbursements, and paid parental leave. Washington Applicants Only: Employees will accrue paid sick leave, 0.0384 PTO balance for every hour worked and be eligible to receive minimum of 9 holidays annually. Marriott HQ is committed to a hybrid work environment that enables associates to Be connected. Headquarters-based positions are considered hybrid, for candidates within a commuting distance to Bethesda, MD; candidates outside of commuting distance to Bethesda, MD will be considered for Remote positions. Marriott International is the world’s largest hotel company, with more brands, more hotels and more opportunities for associates to grow and succeed. Be where you can do your best work,​ begin your purpose, belong to an amazing global​ team, and become the best version of you.Full timePosting Date: 2026-07-23