Over the last (roughly) two decades I have spent a significant amount of energy either hiring people or helping people get jobs. As the Director of USF's practicum program I've helped hundreds of students apply for data science jobs, negotiate salaries and generally navigate the difficulties around employement.
These pages share the advice I've given.
Guidelines for Requesting a Letter of Recommendation for Graduate Programs
The only 5 things you can do to get a job
A Data Driven Apporoach to Filing out your OPT
Data Science, Jobs and COVID