I'm not experienced in budgies as I am too fairly new to owning one (or two hehe.. I got my two birdies JULY this year) but it seems like your budgie may be a beautiful male, BUT I think it may be more of a female (either it's just my lack of knowledge, lighting or my device) as a part of his/her cere is getting quite lighter and has a very faint hint of white, indicating that it may be a female.
A male generally has a dark blue, purple/pink and no hints of white.
A female generally has white, tan/brown and light blue.
I'd wait for the others to say their opinion as they are better at identifying genders haha.
If you would like to learn a few yourself;
Thats a gorgeous budgie! Must've been quite a lovely surprise to see it during work! Congratulations on your new birdie!
There are some stickies on the page already posted that will answer your questions!
I hope this answers your question! If you want to ask any more questions, feel free to do so, we'd love to help!