Are there any specific aspects you'd like to improve around your code?
A few classics that focus on improving "general code style" would be:
- "Clean Code" (https://www.oreilly.com/library/view/clean-code-a/9780136083...)
- "The Pragmatic Programmer" (https://pragprog.com/titles/tpp20/the-pragmatic-programmer-2...)
EDIT: Since you are talking about coding like at a top company, one book that has been sitting on my shelf for a while, but I haven't gotten around to reading yet is "Software Engineering at Google: Lessons Learned from Programming Over Time" (https://learning.oreilly.com/library/view/software-engineeri...)