A Mavenlink developer is responsible for designing, developing, testing, and maintaining software applications within the Mavenlink platform. They work with various programming languages and technologies such as Ruby on Rails, JavaScript, and SQL to build new features, improve existing functionalities, and fix bugs. They also collaborate with other team members, including project managers and UX designers, to ensure the software meets user needs and business goals. Additionally, they participate in code reviews to maintain high-quality code and adhere to best practices. Furthermore, they may also contribute to data analysis and problem-solving efforts.