They are just warnings. You can ignore them.
Very short titles for SEO was a thing about 7 years ago. At that point the best way to rank was to create a page for every search phrase with a title that exactly matched. At this point Google isn't rewarding short titles that exactly match search phrases.
When you have a long title, the worst that is going to happen is:
- The title gets truncated in the search results
- The title gets truncated in the users tab title
- Google uses words in the title to determine the subject of the page. In a very long title, Google has a lot of choice and may end up focusing on the wrong thing
It isn't always better to have a short title. A title should accurately reflect the content of the page. It sometimes takes a longer title to do that. I often edit posts here to add important details to the title of a question. For example if this question were just titled "Title Too Long", that isn't enough. It leaves out the SEO context. Some searchers might assume that the question could help them decide about the the length of the title of their next book. They would click and then leave disappointed. Disappointing users is far worse than shaving some words out of the title.
That being said, it is always better to fit a title in about 60 characters if you can reword it without losing meaning. Google truncates at about 60 characters usually. If you can put three descriptive words near the beginning, that will help users find the right tab in their browser. So the most specific and unique stuff should go in the title first.
The other thing that can be important for a title is to include a call to action or proof of quality. Those probably are not important on your individual job postings pages, but they might be on your company job page. Consider a page listing all of a company's jobs. You could choose between a very short title such as "Deldemeco Jobs" or a more compelling title such as "50+ Deldemoco Jobs, Apply Today".