write code in one or more programming or scripting languages, such as reactjs or JavaScript plan and prototype new applications design the architecture of the components of an application decide on the best technologies and languages for the project test sites and applications in different browsers and environments problem-solve and fix bugs in existing projects test new features thoroughly to ensure they perform the correct task in all cases run performance benchmarking tests review colleagues' code build and test Application Program Interfaces (APIs) for applications to exchange data research, incorporate and contribute to open-source projects meet designers, developers and project staff for progress updates gather requirements from clients and users learn and test new technologies, frameworks and languages build and maintain databases carry out code refactoring and optimisation of existing code document code, so other developers can understand and contribute to it design information architecture within an application or website.
