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Acceldata
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.
How do equals() and hashCode() work together in a HashMap?
Java
Explain the difference between checked and unchecked exceptions.
Java
Explain the event loop: what happens between a setTimeout callback and a resolved promise?
JavaScript
What is a closure? Give an example where one is useful.
JavaScript
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
What causes a component to re-render, and how would you stop unnecessary re-renders?
React
Explain useEffect's dependency array with an example of a bug it can cause.
React
How does dependency injection work in Spring Boot?
Spring
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
Walk me through a project you built: the design, a hard bug and what you'd change.
This kind of role
Reverse a linked list, then explain its time and space complexity.
This kind of role
How would you design a URL shortener?
This kind of role
What do you know about Acceldata's products and customers?
Acceldata
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