A BDD (Behavior-Driven Development) / TDD (Test-Driven Development) developer is typically a software developer who utilizes BDD and TDD methodologies in their software development process. TDD is a development method where the developer writes tests before writing the minimal amount of code required for the test to pass. The process is then repeated, with the developer refactoring the code and expanding the tests as necessary. This method of development is designed to make the code clearer, simpler and bug-free. The steps involved in TDD include: . Write a test that defines a function or improvements of a function, which should be very succinct. . Run all tests to ensure that the new test fails. . Write some code to make the test pass. . Run tests again. . Refactor code and ensure that it meets the standards of simplicity required. BDD is an extension of TDD that aims to make the behaviors of a software system more explicit. It involves writing human-readable sentences describing the behavior of the system, which are then turned into automated tests. The BDD process allows for easier communication between developers, stakeholders, and non-technical participants in a software project. In BDD, developers typically follow these steps: . Write a scenario in a plain language that describes the behavior of the system from the user's perspective. . Write a test to prove that the scenario works as expected. . Write the minimum amount of code needed to pass the test. . Run the tests and refactor the code if necessary. The BDD/TDD developer's role is to write clean, well-factored, well-tested code that satisfies the requirements of the software project. They work closely with other developers, testers, business analysts, and stakeholders to ensure that the software behaves as expected and meets the needs of the users.