If you have a passion for gaming, consider developing indie games. Use platforms like Unity or Unreal Engine to create and sell games. This side hustle can be both creatively rewarding and financially lucrative if your game gains a following.

Develop automation scripts for tasks like web scraping, data manipulation, or system administration. Sell these tools or offer custom development services. Automation scripts are in high demand, particularly in industries like finance and marketing.

Create plugins for popular software like WordPress or browser extensions for Chrome and Firefox. Sell them on marketplaces or create a subscription model. This leverages your coding skills into a scalable product.

Provide coaching for technical interviews. Create a program that includes mock interviews, resume reviews, and coding challenges. Market your services to job seekers looking to land roles at top-tier tech companies.

Offer consulting services to startups or businesses that need software development expertise. This can range from code reviews and architecture planning to helping businesses scale their platforms. Consulting offers high hourly rates and the opportunity to work on a variety of projects.

Develop and sell mobile apps on platforms like the Apple App Store or Google Play. Focus on niche markets where there is less competition. This side hustle requires initial investment in time but can result in significant returns if your app gains popularity.

Platforms like Udemy, Coursera, or Teachable allow you to create and sell courses on software engineering topics you're passionate about. This can be a great way to earn passive income while sharing your expertise with a broad audience.

Contribute to open source projects or start your own. Many large companies support open source projects and offer grants or bounties. This not only enhances your resume but can also be a fulfilling way to give back to the software community.

Start a blog focused on software engineering topics. Share tutorials, best practices, and industry news. Monetize your blog through ads, sponsored posts, and affiliate marketing. It's a great way to establish yourself as an expert in the field while earning passive income.

Offer your coding skills on freelance platforms like Upwork, Freelancer, or Fiverr. Take on projects ranging from small website fixes to full software development. This allows you to choose projects that fit your skill set and availability, providing an excellent way to diversify your income.