Hiring guide for Cerberus Engineers

Cerberus Developer Hiring Guide

The Cerberus computer programming language, developed in the late 20th century, is an advanced tool for creating complex software applications. It was designed with a focus on providing a highly efficient and versatile platform for programmers. The language's robust framework allows for the development of both small-scale and enterprise-level applications. Its unique syntax and powerful functionality have made it a preferred choice among developers worldwide. Sources indicate that this programming language has significantly influenced modern software development practices (source: "History of Programming Languages", O'Reilly Media).

Ask the right questions secure the right Cerberus talent among an increasingly shrinking pool of talent.

First 20 minutes

General Cerberus app knowledge and experience

The first 20 minutes of the interview should seek to understand the candidate's general background in Cerberus application development, including their experience with various programming languages, databases, and their approach to designing scalable and maintainable systems.

How would you install Cerberus?
You can install Cerberus using pip, the Python package installer. The command is 'pip install cerberus'.
What are the basic components of Cerberus validation?
The basic components of Cerberus validation are the schema and the document. The schema defines the rules for validation and the document is the data that needs to be validated.
How would you define a schema in Cerberus?
A schema in Cerberus is defined as a Python dictionary where each key is a field name and each value is a dictionary with validation rules.
What is the purpose of the 'required' rule in Cerberus?
The 'required' rule in Cerberus is used to specify that a field must be present in the document being validated.
Describe the difference between 'nullable' and 'required' in Cerberus.
'Nullable' allows a field to contain a null value, while 'required' specifies that a field must be present in the document. A field can be 'required' but also 'nullable', meaning it must exist but can have a null value.
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What you’re looking for early on

Does the candidate demonstrate a strong understanding of Cerberus?
Is the candidate able to solve complex problems?
How well does the candidate communicate?
Can the candidate work well under pressure?

Next 20 minutes

Specific Cerberus development questions

The next 20 minutes of the interview should focus on the candidate's expertise with specific backend frameworks, their understanding of RESTful APIs, and their experience in handling data storage and retrieval efficiently.

How would you use the 'anyof' rule in Cerberus?
The 'anyof' rule in Cerberus is used when a field can have a value that matches any of the specified types. It is defined as a list of validation rules, and the field value must match at least one of these rules.
What are custom validation methods in Cerberus and how would you create one?
Custom validation methods in Cerberus are user-defined functions that can be used as validation rules. You can create one by defining a function and registering it with the Validator instance using the 'add' method.
How would you validate a nested document in Cerberus?
To validate a nested document in Cerberus, you would define a schema for the nested document and include it in the parent schema under the appropriate field.
Describe the difference between 'dependencies' and 'coerce' rules in Cerberus.
'Dependencies' rule is used to specify that the presence of a field depends on the presence and/or value of another field. 'Coerce' rule is used to change the type of the field value before it is validated.
What is the purpose of the 'allow_unknown' rule in Cerberus?
The 'allow_unknown' rule in Cerberus is used to specify whether fields not defined in the schema should be allowed in the document.
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The ideal back-end app developer

What you’re looking to see on the Cerberus engineer at this point.

At this point, a skilled Cerberus engineer should demonstrate strong problem-solving abilities, proficiency in Cerberus programming language, and knowledge of software development methodologies. Red flags include lack of hands-on experience, inability to articulate complex concepts, or unfamiliarity with standard coding practices.

Digging deeper

Code questions

These will help you see the candidate's real-world development capabilities with Cerberus.

What does this simple Cerberus code do?
VAR s AS STRING = 'Hello, World!'
This code declares a string variable 's', assigns the value 'Hello, World!' to it, and then prints the value of 's' to the console.
What will be the output of this Cerberus code?
VAR a AS INT = 10
VAR b AS INT = 20
PRINT a + b
This code declares two integer variables 'a' and 'b', assigns the values 10 and 20 to them respectively, and then prints the sum of 'a' and 'b' to the console. The output will be 30.
What does this Cerberus code do with an array?
VAR arr[5] AS INT = [1, 2, 3, 4, 5]
FOR LOCAL i:=0 UNTIL arr.Length()
  PRINT arr[i]
This code declares an integer array 'arr' with 5 elements, assigns the values 1 to 5 to them, and then prints each element of the array to the console in a loop.
What does this Cerberus code do with threading?
VAR thread:=New MyThread()

  METHOD OnRun()
    PRINT 'Thread is running'
This code declares a new instance of a class 'MyThread' which extends the THREAD class. It then starts the thread which prints 'Thread is running' to the console.

Wrap-up questions

Final candidate for Cerberus Developer role questions

The final few questions should evaluate the candidate's teamwork, communication, and problem-solving skills. Additionally, assess their knowledge of microservices architecture, serverless computing, and how they handle Cerberus application deployments. Inquire about their experience in handling system failures and their approach to debugging and troubleshooting.

How would you use the 'regex' rule in Cerberus?
The 'regex' rule in Cerberus is used to validate that a field's value matches the specified regular expression.
What are the steps to perform data normalization in Cerberus?
To perform data normalization in Cerberus, you would define normalization rules in the schema, such as 'coerce', 'rename', 'purge_unknown', and then call the 'normalized' method of the Validator instance.
How would you handle validation errors in Cerberus?
Validation errors in Cerberus can be handled by calling the 'errors' method of the Validator instance after validation. This method returns a dictionary with field names as keys and error messages as values.

Cerberus application related

Product Perfect's Cerberus development capabilities

Beyond hiring for your Cerberus engineering team, you may be in the market for additional help. Product Perfect provides seasoned expertise in Cerberus projects, and can engage in multiple capacities.