If you want to rise in your current company, you might consider finding out what skills you need to rise to the next level on the corporate ladder and then target those skills with individual courses. For example, my Mom was a "senior programming analyst" for about 20 years. She was told that she needed personnel and project management skills to rise to the next level of project or group leader. She decided she was having fun where she was, so her continuing education focused on a couple of courses that let her broaden her personal approach to her tasks. Her decision worked in the sense that since she was at the top of the pay scale for her job, she got the max annual bonus for many years in a row, and the company did not fire her through 3 complete corporate mergers. She did have a bachelors degree in math, but her focus was programming and the courses she took were programming courses.
UCSD has extension courses that may be available for open enrollment. That's where she went. She was a Berkeley alum but I'm not sure that was a pre-req for admission to the extension courses.
For you personally I suggest courses in software engineering, rather than "pure" computer science which will touch on a wide variety of topics that may not apply. Or pick/choose courses from the CS degree program at the university of your choice, on the theory that you can learn stuff that applies to you now and can later on be applied to a degree program. But if you're already a programmer, your next step up may be software engineering and project management.