Hiring guide for DRAKON-Perl++ Engineers

DRAKON-Perl++ Developer Hiring Guide

DRAKON-Perl++ is a high-level, interpreted programming language that combines the syntax and features of DRAKON and Perl++. It was developed as an extension of Perl, one of the most powerful text-processing languages in use today. The DRAKON visual language, originally designed for cosmonauts by the Russian space program to simplify complex system understanding, is integrated into this unique software language. This combination allows for clear and concise coding with enhanced readability and maintainability. Its development signifies a significant advancement in programming languages, offering a unique blend of visual clarity from DRAKON and text-processing power from Perl++.

Ask the right questions secure the right DRAKON-Perl++ talent among an increasingly shrinking pool of talent.

First 20 minutes

General DRAKON-Perl++ app knowledge and experience

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

How would you install a Perl module from CPAN?
You can use the CPAN shell or the 'cpan' command. For example, 'cpan install Module::Name'.
What are scalars in Perl?
Scalars are single unit data like a number or a string. They are prefixed with a dollar sign ($).
How would you define a subroutine in Perl?
You can define a subroutine using the 'sub' keyword followed by the subroutine name and block of code. For example, 'sub hello { print "Hello, World!"; }'
Describe the difference between my and local in Perl.
'my' creates a new variable that is only visible in the current scope while 'local' temporarily amends the value of a variable in the current and child scopes.
What is the purpose of the -w switch in Perl?
The -w switch enables warnings for possible errors in the script.
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What you’re looking for early on

Does the candidate have a strong understanding of the DRAKON language?
Can the candidate demonstrate proficiency in Perl++?
Has the candidate worked on significant projects using DRAKON and Perl++?
Is the candidate able to solve complex problems and debug issues?

Next 20 minutes

Specific DRAKON-Perl++ 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 access command line arguments in Perl?
Command line arguments can be accessed using the special array '@ARGV'.
What are the different types of variables in Perl?
Perl has three types of variables: Scalars, Arrays, and Hashes.
Describe the difference between use and require in Perl.
'use' is a compile time directive while 'require' is a runtime directive. 'use' also imports symbols and semantics to the current package.
How would you read and write files in Perl?
You can use the open function to open a file and the print function to write to it. To read a file, you can use the <> operator.
What is the purpose of the $_ variable in Perl?
$_ is the default variable in Perl. Many functions and operators use this variable by default.
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The ideal back-end app developer

What you’re looking to see on the DRAKON-Perl++ engineer at this point.

At this point, a skilled DRAKON-Perl++ engineer should demonstrate strong problem-solving abilities, proficiency in DRAKON-Perl++ 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 DRAKON-Perl++.

What does this simple Perl++ code do?
print 'Hello, World!';
This code will print the string 'Hello, World!' to the standard output.
What does this Perl++ code do?
my $x = 10; 
if ($x > 5) { 
print 'x is greater than 5'; 
} else { 
print 'x is not greater than 5'; 
This code declares a variable 'x' and assigns it a value of 10. Then it checks if 'x' is greater than 5. If 'x' is greater than 5, it prints 'x is greater than 5'. Otherwise, it prints 'x is not greater than 5'.
What will be the output of this Perl++ code?
my @array = (1, 2, 3, 4, 5); 
print $array[2];
This code declares an array with five elements and then prints the third element of the array. The output will be '3'.
What does this Perl++ code do?
use threads; 
my $thr = threads->create(sub { print 'Hello, World!'; }); 
This code creates a new thread that executes the anonymous subroutine, which prints 'Hello, World!'. The 'join' method is then called to ensure that the main program waits for the thread to finish execution before it continues.

Wrap-up questions

Final candidate for DRAKON-Perl++ 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 DRAKON-Perl++ application deployments. Inquire about their experience in handling system failures and their approach to debugging and troubleshooting.

How would you use regular expressions in Perl?
You can use the =~ operator to apply a regular expression to a variable. For example, '$str =~ /regex/'.
What is the difference between a list and an array in Perl?
A list is an ordered collection of scalars while an array is a variable that contains a list.
How would you handle errors in Perl?
You can use the eval function to catch exceptions and the die function to raise exceptions.

DRAKON-Perl++ application related

Product Perfect's DRAKON-Perl++ development capabilities

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