Google's Core team seeks a Senior Software Engineer to build the technical foundation of its flagship products. Responsibilities include writing and testing code, participating in design reviews, reviewing code from peers, contributing to documentation, and resolving system issues. The ideal candidate possesses 5+ years of software development experience, including 3 years in testing/launching products and 1 year in design/architecture. Experience with data structures, algorithms, and various programming languages is essential. This role involves managing project priorities, deadlines, and deliverables, contributing to the development of central solutions, and breaking down technical barriers across Google's products.