As a Software Engineer II, Calendar Backends at Google, you'll own projects end-to-end, collaborating with team leads, program managers, product managers, and UX designers. You'll design, implement, and launch changes to Google Calendar products, focusing on robust solutions and product excellence. Responsibilities include monitoring production systems, optimizing performance, maintaining infrastructure, consulting with partner teams, reviewing designs and code changes, and contributing to a positive work environment. The role requires experience in software development (Python, C, C++, Java, JavaScript), data structures, and algorithms. Preferred qualifications include experience with infrastructure or distributed systems.