When comparing Ruby on Rails developer candidates, it’s essential to consider their hard skills (technical expertise) and soft skills (interpersonal abilities). Hard skills include expertise in the Ruby language, the Rails framework, object-oriented programming, front-end development, databases, testing, and essential tools. Compare portfolios: Review their past work, focusing on code quality and project complexity. Evaluate their willingness and ability to learn new technologies or processes—developers who adapt quickly may be a better fit for evolving projects. Consider, too, their industry experience and work on similar projects. Relevant experience leads to a better understanding of your business requirements. Regarding soft skills, observe their ability to express ideas, ask questions, and provide feedback. Effective communication is crucial for collaboration and project success. So is cultural fit: Candidates who share your values and adapt to your team are more likely to be successful. Candidates with a willingness to grow can be valuable assets.