“J.B. is kind of a stickler about getting to work on time.”
There's a new employee in your department. This morning he came to the office 10 minutes late. You warn him that your boss doesn't like that.
J.B. is kind of a stickler about getting to work on time.
A "stickler" is someone who insists that everyone follow the rules. You can express what kind of rules the stickler makes people follow with the phrases "stickler for ___" or "stickler when it comes to ___":
My boss is a stickler when it comes to correct spelling and grammar.
She's a stickler for punctuality.
The correct preposition to follow "stickler" is "for", but sometimes people use "about":
I'm a real stickler about keeping the kitchen clean.
The word "stickler" sounds a little negative, but it's not rude or offensive.
"Kind of" means "a little" or "somewhat". It can be followed by an adjective or a verb:
I feel kind of obligated to go.
I kind of wanted to go with them.
If you want to use a noun after "kind of", say "kind of a ___":
My house is kind of a mess.
I've always been kind of a nerd.
A lot of jobs have a specific time when they start. Arriving to your workplace before the starting time is called "getting to work on time".