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TDD Test-Driven Development (TDD) is a programming approach that emphasizes writing tests before developing the code functionality.Tech Lead A Tech Lead is a senior developer who provides technical leadership, guides architectural decisions, and mentors team members. Complete guide with responsibilities, skills, and career path.Testing It is the process of verifying the quality, functionality, and performance of a software product.Tester Responsible for ensuring that software products are free of errors and meet quality standards.Three Amigos Three Amigos is an agile practice where Business, Development, and Testing collaborate to define acceptance criteria. Complete guide with format, benefits, examples, and BDD connection.