Senior Full-stack Test Engineer (Test Lead), based in Da Nang

KMS Technology is a strategic engineering company helping businesses turn bold ideas into high-impact solutions—faster. Founded in 2009 as a U.S.-based services company, we’ve grown into a global organization with locations in the US, Vietnam, Mexico and Poland. KMS is trusted globally for the quality of our engineering and consulting services. We bring deep expertise in product development and quality assurance, Data & AI-native engineering, and delivery excellence to every engagement. Our mission is to help customers build what’s next—accelerating innovation, crafting brilliant solutions, and creating real-world impact. At KMS, we believe sustainable growth is built on the success of our clients and employees, and in making a lasting contribution to our communities. More about KMS Technology: Website: https://kms-technology.com LinkedIn: https://www.linkedin.com/company/kms-technology We are looking for a Senior Full-stack Test Engineer to take end-to-end ownership of quality for a System Integration Testing (SIT) project, combining strong manual testing depth with hands-on test automation. This is an SIT role, not a UAT role. You will validate how multiple systems behave together — verifying business flows end to end, the impact of a change on upstream and downstream systems, and the contracts between services — rather than simply confirming acceptance criteria from a user's seat. You will drive the full test lifecycle for your primary project (test plan → test design → execution → sign-off), and at the same time keep an overview of 1–2 additional projects so you can advise their testing teams and step in when delivery is at risk. The role suits someone with very high ownership and a proactive mindset: someone who chases requirements before they are handed over, raises integration risks early, and is comfortable being the quality decision-maker for their project. Responsibilities Project ownership Own the complete test lifecycle for one project: test strategy and