Principal Engineer Interview Questions

4,347 principal engineer interview questions shared by candidates

The interview rounds were designed to assess: 1. Ability to think a product - features, flaws and improvements. 2. Customer obsession 3. Technical concepts, Peer coding 4. Discussions on side projects and projects in the company. 5. Experience in making high quality UI 5. Ability to bring right processes in the existing frontend system, drive those projects and mentor juniors
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Principal Frontend Engineer

Interviewed at Noon Academy

3.6
Dec 5, 2020

The interview rounds were designed to assess: 1. Ability to think a product - features, flaws and improvements. 2. Customer obsession 3. Technical concepts, Peer coding 4. Discussions on side projects and projects in the company. 5. Experience in making high quality UI 5. Ability to bring right processes in the existing frontend system, drive those projects and mentor juniors

Initial technical assessment on React and Frontend Architecture level discussion and some system design questions A lot of repeated discussion on your current work and achievements with every interviewer (it seems they must have got the resume at last minute before interview)
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Principal Engineer (Frontend)

Interviewed at Noon Academy

3.6
Dec 5, 2020

Initial technical assessment on React and Frontend Architecture level discussion and some system design questions A lot of repeated discussion on your current work and achievements with every interviewer (it seems they must have got the resume at last minute before interview)

Final, finally Bean Scopes in spring Old Java Design patterns: Proxy, Adapter, Facade How would you implement a singleton? Gotcha Snippets ( == / equals / instanceof and other quirky, autoboxing and unboxing gotcha questions) What would you say if your manager turns your proposal down, says simply "this is not how we used to do things", then refuses to elaborate.
Nov 14, 2025

Final, finally Bean Scopes in spring Old Java Design patterns: Proxy, Adapter, Facade How would you implement a singleton? Gotcha Snippets ( == / equals / instanceof and other quirky, autoboxing and unboxing gotcha questions) What would you say if your manager turns your proposal down, says simply "this is not how we used to do things", then refuses to elaborate.

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