The Washington Post has significantly increased its budget and plans to make dozens of newsroom hires under its new owner, the Amazon founder Jeffrey P. Bezos, the paper’s executive editor, Marty Baron, said in an interview on Wednesday.

Mr. Bezos has closely consulted with The Post’s leadership in plotting its growth strategy and the moves represent Mr. Bezos’s “first mark on the paper,” Mr. Baron said.

The Post will introduce several initiatives this year, Mr. Baron said in a memo to his staff on Wednesday. There will be five new politics reporters as well as photo editors, data visualization specialists, news desk staff and web designers. It will add a breaking news desk and a Sunday style and arts section, as well as a revamped Sunday magazine that will be “bigger in dimension and in the number of pages, with a new design and a range of new features.”

The plan will be executed quickly — interviews for new hires began weeks ago — and represents “a substantial expansion of the budget,” Mr. Baron said, though he declined to provide precise figures.