As other two comments mentioned you have two options, create a github repository of your code and/or create a web app for hiring managers to see and review. I

As other two comments mentioned you have two options, create a github repository of your code and/or create a web app for hiring managers to see and review. I believe ageism is prevalent in this industry. Most shops that have people in early 20s at junior positions in web development most likely will make excuses and not hire you in those roles. You might be able to break in web development after joining a company in system engineering or devOps role and showing your web dev chops by using it to solve your and your colleagues itch in system engineering. In my last job, a colleague made the same transition by doing things for example creating an internal web site for system engineering group for weekly status report, storing online important customer configuration files, indexing documents for search etc. things that were annoying to people in his group and he made them suck less. Soon, he was asked to join our intranet development group, it was a lateral move for him instead of starting from bottom. Another avenue will be to do freelance. Nobody cares about your age as long as you can deliver the work requested by client. Personally, I made a similar move from system engineering in my mid-40s to webdev/analytics. It was clear during the transition while interviewing for webdev/analytics role that no one will hire me in such roles due to age as well as elementary quality of the code that I write. But then something magical happened, I created a web app to scratch my own itch using the same quality of code that hiring managers were not impressed with. I guess thousands of others had the same itch and now I have 1,700 users, both individuals and businesses. Suddenly, I was being considered expert not in webdev but the industry vertical my web app targeted. I now consult in that industry vertical at rates much higher than what any webdev job would have paid.