Your choice of an engineer should depend on the role they are hired to perform on your project as well as the complexity and scale of the particular tasks they would need to complete. Obviously, senior and middle engineers possess far better coding skills and more knowledge accumulated along the way, but sometimes a junior specialist’s enthusiasm and curiosity about learning new things might provide your project with many new, interesting, unconventional ideas and solutions.To avoid any extra costs when hiring a specialist and have a clear understanding of what you’re actually paying for and why, read our comprehensive guide on Software Development Roles and Responsibilities in Outsourcing.