Common hiring mistakes include failing to define project requirements clearly, overlooking soft skills, and not assessing real-world coding abilities. Relying only on resumes without practical coding tests can lead to poor hiring decisions. Not checking references or past work history can result in hiring under qualified candidates. Ignoring cultural fit and communication skills may cause team collaboration issues. Rushing the hiring process without structured evaluations can lead to long-term inefficiencies. Hire asp.net developers, companies should avoid these mistakes by implementing a thorough hiring process that balances technical assessments, soft skill evaluations, and trial projects.