Mock interview for a Junior Python Developer – Kostya

In this interview, a candidate with around three years’ experience attempts to secure a role as a junior/middle Python developer. During the conversation, we discuss not only Python but also engineering thinking: how to explain complex concepts in simple terms, and the importance of confidence, theoretical knowledge and the ability to justify one’s decisions.

The video covers the following topics:
— what an interface is in Python
— classes, methods and the boundaries of ‘good’ design
— SOLID, DRY, KISS
— Dependency Injection and Dependency Inversion
— singleton in Python
— shallow copy and deep copy
— how to answer in an interview if you know the practical side but are a bit shaky on the theory
— detailed final feedback on the candidate’s level

This video will be useful for anyone preparing for a Python developer interview, wanting to understand typical mistakes in answers and improve their self-presentation skills in a technical interview.

Timecodes:

00:00 Start
00:11 Introduction and introduction of participants
02:37 Interview rules and format
04:07 Interfaces in Python in simple terms
06:36 How many methods are normal for a class
11:52 SOLID: what it is and why it’s needed
13:46 DI vs DIP: what’s the difference
17:53 How to explain the principles to a junior
21:53 Single Responsibility in practice
24:33 DRY and KISS versus ‘pure’ principles
28:12 Singleton: pattern or anti-pattern
35:30 Ways to implement Singleton in Python
40:46 Shallow and deep copying
55:41 The candidate’s impressions of the interview
58:22 Analysis of mistakes and strengths

Let us know in the comments how you would answer questions about SOLID, Singleton and object copying in Python.

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