Sajjad Umar is a seasoned Ruby on Rails backend engineer with a wealth of experience in developing a diverse range of web applications. With a strong background in Ruby on Rails, he has successfully delivered projects spanning from complex IoT systems to robust e-commerce solutions. Having collaborated with numerous companies and clients worldwide, Sajjad has gained valuable insights into industry best practices and a deep understanding of web development.

In addition to his technical expertise, Sajjad is actively involved in fostering the Ruby on Rails community. Sajjad's passion for knowledge- sharing extends beyond local communities, as he regularly contributes to the field through blogging, writing articles, and creating content on his popular YouTube channel, Desi Developer. Moreover, he is dedicated to keeping the community informed through his role as the curator of the Ruby on Rails Monthly newsletter.

Sajjad's commitment to the Ruby on Rails ecosystem is further demonstrated by his presence as a keynote speaker at various conferences. By sharing his experiences and expertise, he inspires and educates fellow developers, helping them enhance their skills and stay up-to-date with the latest trends and advancements in web development.

With his extensive technical knowledge, community involvement, and dedication to sharing insights, Sajjad Umar brings a unique perspective and valuable expertise to his book, Ruby on Rails for Agile Web Development. Readers can trust his guidance and benefit from his wealth of experience in mastering agile web development using Ruby on Rails.