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Mastercard
Practice questions for the skills this job lists, plus common questions for any interview. These are for practice: we don’t know the employer’s actual questions.
What is the difference between a list and a tuple, and when would you use each?
Python
How do generators work, and why would you use one over a list?
Python
Write a query for the second-highest salary in each department.
SQL
Explain the difference between INNER, LEFT and FULL joins with an example.
SQL
How would you find and fix a slow query in Postgres (EXPLAIN ANALYZE)?
PostgreSQL
What are transaction isolation levels, and which problems does each prevent?
MySQL
When would you embed documents versus reference them in MongoDB?
MongoDB
Design a simple, highly available web app on AWS. Which services and why?
AWS
What's the difference between an IAM role and an IAM user?
AWS
What is Terraform state, and how do teams share it safely?
Terraform
Tell me about a dataset you cleaned. What problems did you find?
This kind of role
How would you explain a model's result to a non-technical manager?
This kind of role
What do you know about Mastercard's products and customers?
Mastercard
Tell me about yourself in two minutes, focused on this role.
About you
Why this company, and why this role?
About you
Tell me about a time you disagreed with a teammate. What happened?
About you
Describe a time you failed or missed a deadline, and what you changed afterwards.
About you