Hiring guide for Poplog Engineers

Poplog Developer Hiring Guide

Poplog is a robust, multi-language programming environment that has proven its effectiveness and efficiency over several decades. Originally developed in the 1980s at the University of Sussex, it has been a pivotal tool for artificial intelligence and cognitive science research. It supports incremental compilation and interactive development, making it an ideal platform for rapid prototyping and exploratory programming. Poplog's unique selling point lies in its multi-language support. It incorporates four core programming languages: Pop-11, Prolog, Common Lisp, and Standard ML. This multi-language feature allows developers to leverage the strengths of each language and use the most suitable one for different aspects of a project, thus enhancing productivity and code efficiency. Pop-11, the primary language of Poplog, is a powerful, high-level language that combines the best features of Lisp and ALGOL. It is renowned for its simplicity and expressiveness, making it a preferred choice

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

First 20 minutes

General Poplog app knowledge and experience

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

How would you define Poplog?
Poplog is a multi-language software development system that supports incremental compilation and the creation of mixed-language programs. It includes the Pop-11, Prolog, Common Lisp, and Standard ML programming languages.
What are the main languages supported by Poplog?
Poplog supports four main languages: Pop-11, Prolog, Common Lisp, and Standard ML.
Describe the difference between Pop-11 and Prolog in the context of Poplog.
Pop-11 is a powerful and flexible high level language suitable for a wide range of tasks, while Prolog is a logic programming language associated with artificial intelligence and computational linguistics.
How would you initiate Poplog in a Unix environment?
In a Unix environment, you can initiate Poplog by typing 'pop11' into the command line.
What is the purpose of the 'ved' editor in Poplog?
The 'ved' editor is Poplog's built-in text editor. It is used for creating and modifying source code.
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What you’re looking for early on

Does the candidate have a strong understanding of Poplog?
Has the candidate demonstrated problem-solving skills?
Is the candidate familiar with other programming languages?
Can the candidate work well in a team?

Next 20 minutes

Specific Poplog 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.

What are the advantages of using Poplog for AI development?
Poplog's support for incremental compilation and mixed-language programming makes it ideal for AI development. It also includes a number of libraries and tools specifically designed for AI.
Describe the difference between incremental and batch compilation in Poplog.
Incremental compilation allows for the addition of new code to a running program, while batch compilation requires the entire program to be compiled at once.
How would you handle errors in Poplog?
Poplog has a built-in error handling system. When an error occurs, it is displayed in the 'ved' editor, and you can use the 'help' command to get more information.
What is the role of 'popc' in Poplog?
'popc' is the Poplog command used to compile source files. It can be used to compile individual files or entire directories.
How would you use Poplog to create a mixed-language program?
Poplog allows for the creation of mixed-language programs by using the 'uses' command to include code from different languages. The code is then compiled together into a single program.
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The ideal back-end app developer

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

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

What does this simple Poplog code do?
define add(x, y);
    x + y;
This code defines a function named 'add' that takes two parameters, x and y, and returns their sum.
What will be the output of this Poplog code?
define hello_world();
    printf('Hello, World!');
This code will print 'Hello, World!' to the console. It first defines a function named 'hello_world' that prints 'Hello, World!', and then calls that function.
What does this Poplog code do with the array?
define array_sum(arr);
    lvars arr, sum = 0, i;
    for i from 1 to datalength(arr) do
        sum +:= arr(i);
This code defines a function named 'array_sum' that takes an array as an argument and returns the sum of its elements. It initializes a variable 'sum' to 0, then loops over each element in the array, adding each element's value to 'sum'. Finally, it returns 'sum'.
What does this Poplog code do related to threading?
define process_list(list);
    lvars list, processed_list = [], i;
    for i from 1 to datalength(list) do
        processed_list -> cons(i, processed_list);
This code defines a function named 'process_list' that takes a list as argument and returns a new list with the elements in reverse order. It initializes an empty list 'processed_list', then loops over each element in the input list, adding each element to the start of 'processed_list'. This simulates a stack-like behavior, which is a common pattern in multithreaded or concurrent programming.

Wrap-up questions

Final candidate for Poplog 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 Poplog application deployments. Inquire about their experience in handling system failures and their approach to debugging and troubleshooting.

What are some challenges you might face when working with Poplog and how would you overcome them?
Some challenges might include the learning curve associated with the different languages supported by Poplog, and managing the complexity of mixed-language programming. These can be overcome through careful study, practice, and good program design.
How would you debug a Poplog program?
Poplog includes a number of debugging tools, including a trace facility, a print statement for displaying variable values, and the ability to set breakpoints.
Describe the difference between Poplog and other development environments.
Poplog is unique in its support for multiple languages and its focus on AI development. It also includes a number of features not commonly found in other environments, such as incremental compilation and built-in text editing.

Poplog application related

Product Perfect's Poplog development capabilities

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