Demonstrate competency first. Solve the main problem you were brought there for. Solve it right, solve it fast, employ all the ideas you wish to see, document

Demonstrate competency first. Solve the main problem you were brought there for. Solve it right, solve it fast, employ all the ideas you wish to see, documentation, testing, monitoring, dev server, peer reviews. Earn their trust and respect, you are 2 weeks in. Focus on the job at hand, and in 2-3 months, you will know who can be your allies and you can then start figuring out how to get these changes out.