Engaging in open source projects can be financially rewarding. Platforms like Opire connect developers with bounties for resolving real-world issues.Consider technical writing as a way to earn side income. Many companies are willing to pay for guest writers for their blogs.Participate in hackathons for cash prizes and networking opportunities. Even if you don’t win, the projects you develop can enhance your portfolio.Freelancing, developing digital products, and monetizing APIs are other strategies for developers to earn side income.