Zendesk QA is hiring for a hybrid backend role in Estonia to develop AI-driven customer service quality assurance tools that help teams deliver high-quality support and reduce churn. The stack includes Python, PostgreSQL/MySQL, BigQuery/Spanner, REST and RPC-based APIs, Kubernetes/Docker, Airflow, Google Cloud Platform, and a monorepo setup. You’ll work with a 6-week mission-driven development cycle, act with independence, build APIs and reusable code, optimize performance and security, design data storage solutions, integrate with help desk and analytics platforms, and perform code reviews and automated testing. Requirements include at least 5 years of backend experience, proficiency in Go/Python/Java, strong SQL/database knowledge, cloud-native experience, GCP or AWS, fluent English, and an interest in ML Ops. Zendesk emphasizes a hybrid-on-site culture, diversity and inclusion, potential AI screening, and accommodations for disabilities.