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KRL, which stands for KUKA Robot Language, is a proprietary programming language developed by KUKA Robotics Corporation. It is specifically designed for controlling and programming industrial robots. KRL has a syntax similar to Pascal or JavaScript, making it easier to learn for those familiar with these languages. The language allows programmers to control robot movements, manage sensors and actuators, handle error conditions and perform complex calculations. It also supports object-oriented programming features such as classes and objects. KRL provides a high level of flexibility and precision in robot control, making it an essential tool in the field of robotics automation.

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

First 20 minutes

General KRL app knowledge and experience

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

How would you describe KRL?

KRL, or Kynetx Rule Language, is a rule-based language designed for building web-based, distributed, event-driven applications.

What are the basic elements of KRL?

The basic elements of KRL include rules, events, and actions. Rules define the behavior of the application, events trigger the rules, and actions are the results of the triggered rules.

How would you declare a variable in KRL?

In KRL, you declare a variable using the 'declare' keyword followed by the variable name and its value. For example: 'declare x = 10;'

Can you explain the event-expression in KRL?

An event-expression in KRL is used to match events. It consists of a domain and a type, and can also include additional attributes for more specific matching.

What are the different types of operators in KRL?

KRL supports a variety of operators, including arithmetic operators, comparison operators, logical operators, and string operators.

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What you’re looking for early on

Does the candidate have a solid understanding of KRL?

Can the candidate solve problems effectively?

Does the candidate have experience with other programming languages?

Is the candidate able to communicate effectively?

Next 20 minutes

Specific KRL 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 define a rule in KRL?

A rule in KRL is defined using the 'rule' keyword, followed by the rule name, event-expression, condition, and action block. For example: 'rule example_rule { select when pageview url "example.com" pre { ... } always { ... } }'

Describe the difference between 'every' and 'any' in KRL.

'Every' and 'any' are quantifiers in KRL. 'Every' means that the condition must be true for all elements in a collection, while 'any' means that the condition must be true for at least one element in the collection.

What is the purpose of the 'pre' block in a KRL rule?

The 'pre' block in a KRL rule is used for pre-processing. It allows you to declare and initialize variables that can be used in the condition and action blocks of the rule.

How would you handle errors in KRL?

KRL does not have built-in error handling mechanisms like try-catch blocks. However, you can use conditions to check for potential errors and handle them appropriately.

What is the role of the 'fired' keyword in KRL?

The 'fired' keyword in KRL is used to check whether a rule has been triggered or not. It returns a boolean value.

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

What does the following KRL code do?
{
  "name": "John",
  "age": 30,
  "city": "New York"
}
This code defines a JSON object with three key-value pairs. The keys are 'name', 'age', and 'city', and their corresponding values are 'John', 30, and 'New York'.
What will be the output of the following KRL code?
{
  "employees":[
    {"firstName":"John", "lastName":"Doe"},
    {"firstName":"Anna", "lastName":"Smith"},
    {"firstName":"Peter", "lastName":"Jones"}
  ]
}
This code will output a JSON object containing an array of objects. Each object represents an employee with 'firstName' and 'lastName' properties.
What does the following KRL code do?
{
  "students": [
    {
      "name": "John",
      "grades": [90, 85, 88]
    },
    {
      "name": "Jane",
      "grades": [92, 87, 91]
    }
  ]
}
This code creates a JSON object with a key 'students' whose value is an array of objects. Each object represents a student with a name and an array of grades.
What does the following KRL code do?
{
  "thread": [
    {
      "id": 1,
      "status": "running"
    },
    {
      "id": 2,
      "status": "stopped"
    }
  ]
}
This code creates a JSON object with a key 'thread' whose value is an array of objects. Each object represents a thread with an id and a status.

Wrap-up questions

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

How would you use the 'pick' operator in KRL?

The 'pick' operator in KRL is used to select elements from a map based on their keys. For example: 'my_map.pick("key1", "key2")' would return a new map with only the elements with keys 'key1' and 'key2'.

Describe the difference between 'map' and 'reduce' functions in KRL.

'Map' and 'reduce' are higher-order functions in KRL. 'Map' applies a function to each element of a collection and returns a new collection with the results, while 'reduce' applies a function to each element of a collection in order to combine them into a single value.

What is the purpose of the 'foreach' keyword in KRL?

The 'foreach' keyword in KRL is used to iterate over a collection. It is similar to the 'for' loop in other programming languages.

KRL application related

Product Perfect's KRL development capabilities

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

KRL Consultive assessments

KRL Application Conversion Assessment KRL Application Integration Assessment KRL Data & Database Integration Assessment

Custom KRL development projects

Custom KRL App Conversion KRL Custom App Development Process App UI Design for KRL Facelifts

Hiring guide for KRL Engineers

KRL Developer Hiring Guide

What you’re looking for early on

The ideal back-end app developer

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

KRL Consultive assessments

Custom KRL development projects