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Lenskart
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
How do equals() and hashCode() work together in a HashMap?
Java
Explain the difference between checked and unchecked exceptions.
Java
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 Node handle many concurrent requests on a single thread?
Node.js
How would you structure error handling in an Express or Fastify API?
Node.js
Explain the CAP theorem with a real example.
Distributed systems
How would you make a payment API idempotent?
Distributed systems
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 Lenskart's products and customers?
Lenskart
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