Software Development Jobs in Cary, IL (NOW HIRING)

The Opportunity
Hyatt Hotels Corporation seeks an enthusiastic Senior Software Development Engineer in Test (SDET) to join our Digital - Marketing Technology Organization. In this role, you will be collaborating closely with the broader {Insert teams this candidate will engage with} team, where you'll be instrumental in continuing to make Hyatt a leading hospitality company. You will be part of a team that is passionate about our purpose, committed to nurturing curiosity and new skills, and building connections across the organization with colleagues, customers, and guests.
Who We Are
At Hyatt, we believe in the power of belonging and creating a culture of care, where our colleagues become family. Since 1957, our colleagues and our guests have been at the heart of our business and helped Hyatt become one of the best and fastest-growing hospitality brands in the world. Our transformative growth and the addition of new hotels, brands, and business lines can open the door for exciting career and growth opportunities for our colleagues.
As we continue to grow, we never lose sight of what's most important: People. We turn trips into journeys, encounters into experiences, and jobs into careers.
Why Now?
This is an exciting time to be at Hyatt. We are growing rapidly and are looking for passionate changemakers to be a part of our journey. The hospitality industry is resilient and continues to offer dynamic opportunities for upward mobility, and Hyatt is no exception.
How We Care for Our People
What sets us apart is our purpose-to care for people so they can be their best. Every business decision is made through the lens of our purpose, and it informs how we have and will continue to support each other as members of the Hyatt family. Our care for our colleagues is the key to our success. We're proud to have earned a place on Fortune's prestigious 100 Best Companies to Work For® list since 2013. This recognition is a testament to the tremendous way our Hyatt family continues to come together to care for one another, our commitment to a culture of inclusivity, empathy, and respect, and making sure everyone feels like they belong.
We're proud to offer exceptional corporate benefits which include:
• Annual allotment of free hotel stays at Hyatt hotels globally
• Flexible work schedule
• Work-life benefits including wellbeing initiatives such as a complimentary Headspace subscription, and a discount at the on-site fitness center
• A global family assistance policy with paid time off following the birth or adoption of a child as well as financial assistance for adoption
• Paid Time Off, Medical, Dental, Vision, 401K with company match
Who You Are
As our ideal candidate, you understand the power and purpose of our culture of care, and embody our core values of Empathy, Inclusion, Integrity, Experimentation, Respect, and Wellbeing. You enjoy working with others, are results-driven, and are looking for a variety of opportunities to develop personally and professionally.
The Role
Hyatt's Marketing Technology & Personalization team powers personalized guest experiences across web, mobile, email, paid media, and on property touchpoints. Our cloud native MarTech ecosystem integrates first party guest data, AI driven decisioning, and real time orchestration to deliver meaningful, relevant interactions at global scale.
We are seeking a Software Development Engineer in Test (SDET) to join our MarTech platform engineering organization. This role is responsible for building and scaling automated test solutions for services deployed in AWS, with a strong focus on data quality, personalization logic, AI driven decisioning, and system reliability. This is a hands on engineering role that partners closely with platform, data, and product teams to ensure quality is built into the system from design through production.
Responsibilities
• Design, build, and maintain automated test frameworks for cloud native services, APIs, and event driven workflows running in AWS
• Develop integration, contract, and end to end tests validating interactions across customer data platforms, personalization engines, campaign orchestration, and downstream channels
• Embed automated testing and quality gates into CI/CD pipelines to support fast, reliable releases
• Validate personalization, segmentation, and eligibility logic across channels, regions, brands, and guest journeys
• Create reusable libraries and tooling that enable engineering teams to self service testing at scale
• Build automated tests for AI and ML driven systems, including recommendation outputs, decision logic, and optimization flows
• Ensure correctness and stability of guest data pipelines, identity resolution, and activation outputs
• Implement automated checks for schema changes, data anomalies, latency, and failure scenarios
• Partner with engineering teams to improve testability, observability, and resilience of services
• Leverage AWS native tooling and logs to support test diagnostics, debugging, and root cause analysis
• Participate in incident reviews and contribute to prevention through automated quality controls and tooling
• Promote a culture of quality engineering, automation, and shared ownership across the MarTech organization
• Coordinate larger testing efforts and sharing of best practices across teams and organizations