The Senior Scala Engineer will be responsible for designing, developing, and deploying backend services, focusing on high availability, quality, low latency, and scalability. The role involves measuring and evaluating features and system metrics to improve user experience and service performance. The engineer will be proactive and collaborate with teams to build integration solutions and backend software, working with complex products, system design, data structures, and algorithms. This includes coding primarily in Scala and working with technologies like MongoDB, RabbitMQ, and REST services.