Hiring guide for Chez Scheme. Engineers

Chez Scheme. Developer Hiring Guide

Chez Scheme is a high-performance programming language developed by Cadence Research Systems and later acquired by Cisco Systems. It was first introduced in 1985 by R. Kent Dybvig, a well-known computer scientist. As a variant of the Scheme programming language, Chez Scheme is renowned for its efficient compilation and execution of code. It is widely used in both academic and industrial settings due to its robustness and versatility. The source code for Chez Scheme was made publicly available in 2016, further enhancing its accessibility among programmers worldwide.

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

First 20 minutes

General Chez Scheme. app knowledge and experience

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

How would you define Scheme programming language?
Scheme is a high-level, functional programming language that supports first class procedures. It is a statically scoped and properly tail-recursive dialect of the Lisp programming language.
What are the basic data types in Scheme?
The basic data types in Scheme include numbers, booleans, characters, strings, symbols, pairs and lists, and procedures.
How would you define a variable in Chez Scheme?
In Chez Scheme, you can define a variable using the 'define' keyword. For example, '(define x 10)' defines a variable x and assigns it the value 10.
What is a lambda function in Scheme?
A lambda function in Scheme is a function defined using the 'lambda' keyword. It is an anonymous function that can be used anywhere a function is expected.
Describe the difference between 'let' and 'let*' in Scheme.
'let' and 'let*' are both used to bind variables in Scheme. The difference is that 'let' binds all variables simultaneously, while 'let*' binds them sequentially, allowing each binding to see the bindings made earlier in the list.
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What you’re looking for early on

Does the candidate have a solid understanding of Chez Scheme?
Can the candidate solve problems using Chez Scheme?
Has the candidate demonstrated a capacity to learn new technologies?
Does the candidate have experience with other Scheme dialects?

Next 20 minutes

Specific Chez Scheme. 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 implement recursion in Chez Scheme?
Recursion in Chez Scheme can be implemented by defining a function that calls itself. For example, a recursive function to calculate factorial can be defined as '(define (factorial n) (if (zero? n) 1 (* n (factorial (- n 1)))))'.
What is tail recursion in Scheme and why is it important?
Tail recursion in Scheme is a form of recursion where the recursive call is the last operation in the function. It is important because it allows the Scheme interpreter to optimize the recursion, preventing stack overflow and making the recursion as efficient as a loop.
How would you handle errors in Chez Scheme?
Errors in Chez Scheme can be handled using the 'with-exception-handler' function, which allows you to specify a function to handle any exceptions that are raised.
What is the role of the Scheme macro system?
The Scheme macro system allows you to define new syntax constructs. It is a powerful tool for abstraction, allowing you to write code that is more concise and expressive.
Describe the difference between 'eq?', 'eqv?' and 'equal?' in Scheme.
'eq?', 'eqv?' and 'equal?' are all comparison operators in Scheme. 'eq?' tests if two objects are the same, 'eqv?' tests if two objects are equivalent in a way that respects the abstract value of objects, and 'equal?' tests if two objects are structurally equivalent.
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The ideal back-end app developer

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

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

What does the following Chez Scheme code do?
(define (square x) (* x x))
This code defines a function named 'square' that takes a single argument 'x' and returns the square of 'x'.
What will be the output of the following Chez Scheme code?
(define (f x) (if (zero? x) 1 (* x (f (- x 1)))))
(f 5)
The output will be '120'. This code defines a recursive function that calculates the factorial of a number. The function 'f' is called with the argument '5', so it calculates the factorial of 5.
What does the following Chez Scheme code do?
(define (map f lst)
  (if (null? lst)
      (cons (f (car lst)) (map f (cdr lst)))))
This code defines a function 'map' that applies a function 'f' to each element of a list 'lst'. It creates a new list with the results.
What does the following Chez Scheme code do?
(define (thread f)
  (let ((t (make-thread f)))
    (thread-start! t)
This code defines a function 'thread' that creates a new thread running a function 'f' and starts it immediately. The new thread is returned.

Wrap-up questions

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

How would you create a list in Chez Scheme?
A list in Chez Scheme can be created using the 'list' function. For example, '(list 1 2 3)' creates a list with the elements 1, 2, and 3.
What are continuations in Scheme and how are they used?
Continuations in Scheme represent the rest of a computation from a certain point. They can be used to implement advanced control structures, such as non-local exits, backtracking, and coroutines.
How would you implement a higher-order function in Chez Scheme?
A higher-order function in Chez Scheme can be implemented by defining a function that takes one or more functions as arguments and/or returns a function as its result. For example, the 'map' function is a higher-order function that applies a function to each element of a list and returns a list of the results.

Chez Scheme. application related

Product Perfect's Chez Scheme. development capabilities

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