Hiring guide for Epigram 2 Engineers

Epigram 2 Developer Hiring Guide

Epigram 2 is a functional programming language that is designed for dependently typed programming, which allows for more precise types and specifications. It is the successor to the original Epigram language and includes several improvements and new features. Epigram 2 is interactive and features a type-driven development environment, which helps programmers to construct and modify their programs in a more efficient and reliable manner. It is particularly useful for tasks that require a high degree of correctness, such as theorem proving and formal verification of software.

Ask the right questions secure the right Epigram 2 talent among an increasingly shrinking pool of talent.

First 20 minutes

General Epigram 2 app knowledge and experience

The first 20 minutes of the interview should seek to understand the candidate's general background in Epigram 2 application development, including their experience with various programming languages, databases, and their approach to designing scalable and maintainable systems.

How would you define the role of an Epigram 2 developer?
An Epigram 2 developer is responsible for developing, testing, implementing, and maintaining applications and systems using the Epigram 2 programming language. They are also responsible for debugging issues and finding solutions to fix them.
What are some fundamental concepts in Epigram 2?
Some of the fundamental concepts in Epigram 2 include dependent types, interactive theorem proving, and functional programming concepts such as recursion and higher order functions.
Describe the difference between Epigram 1 and Epigram 2.
Epigram 1 and Epigram 2 have similar goals but different implementations. Epigram 2 has a more advanced type system and offers more features, including an interactive development environment.
How would you handle a situation where your program in Epigram 2 is not compiling due to a type error?
I would first analyze the error message to understand the nature of the type error. I would then trace the error to the specific part of the code causing the issue, and then make the necessary adjustments to fix the type error.
What are some advantages of using Epigram 2?
Epigram 2 offers a number of advantages such as a powerful type system, interactive theorem proving capabilities, and an integrated development environment. It's also a functional programming language, which can help to write more maintainable and bug-free code.
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What you’re looking for early on

Does the candidate have a solid understanding of Epigram 2?
Has the candidate demonstrated problem-solving skills?
Is the candidate able to communicate effectively?
Does the candidate have relevant experience?

Next 20 minutes

Specific Epigram 2 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 approach debugging a complex problem in Epigram 2?
I would start by trying to reproduce the issue consistently. Once I have a reliable way to reproduce the issue, I would use the Epigram 2's debugging tools to step through the code and identify where the issue is occurring. Finally, I would make the necessary code changes to fix the issue.
What are the key components of Epigram 2's type system?
Epigram 2's type system includes dependent types, which allow types to be predicated on values, and inductive families, which allow the definition of types by induction.
Describe the difference between functional programming and imperative programming and how it applies to Epigram 2.
Functional programming is a style of programming where the output value of a function depends only on its arguments, without observable side effects. This is in contrast to imperative programming, where programs are composed of statements which change global state. Epigram 2 is a functional language, which means it encourages immutability and the use of functions.
How would you implement a recursive function in Epigram 2?
In Epigram 2, recursive functions are implemented similarly to other functional programming languages. You would define a base case for the recursion to end, and a recursive case where the function calls itself with a different argument.
What are some challenges you might encounter when programming in Epigram 2 and how would you overcome them?
One of the challenges could be understanding and properly using Epigram 2's sophisticated type system. To overcome this, I would invest time in learning and practicing the concepts of dependent types and inductive families. Another challenge could be debugging, for which I would use Epigram 2's debugging tools and good debugging practices.
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The ideal back-end app developer

What you’re looking to see on the Epigram 2 engineer at this point.

At this point, a skilled Epigram 2 engineer should demonstrate strong problem-solving abilities, proficiency in Epigram 2 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 Epigram 2.

What does the following simple Epigram 2 code do?
add : Nat -> Nat -> Nat
add zero m = m
add (suc n) m = suc (add n m)
This code defines a function 'add' that takes two natural numbers and returns their sum. The function is defined recursively.
What will be the output of the following Epigram 2 code?
trueAnd : Bool -> Bool -> Bool
trueAnd true y = y
trueAnd false _ = false
This code defines a function 'trueAnd' that takes two boolean values and returns their logical AND. If the first argument is 'false', the function immediately returns 'false' without evaluating the second argument.
What does the following Epigram 2 code do?
map : (A -> B) -> List A -> List B
map _ [] = []
map f (x :: xs) = f x :: map f xs
This code defines a function 'map' that takes a function and a list, and applies the function to each element of the list, returning a new list.
What does the following Epigram 2 code do?
par : (A -> B) -> (C -> D) -> (A,C) -> (B,D)
par f g (x, y) = (f x, g y)
This code defines a function 'par' that takes two functions and a pair of values, and applies each function to its corresponding value in the pair, returning a new pair. This is an example of parallel computation.

Wrap-up questions

Final candidate for Epigram 2 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 Epigram 2 application deployments. Inquire about their experience in handling system failures and their approach to debugging and troubleshooting.

How would you use Epigram 2 for interactive theorem proving?
Epigram 2 provides a powerful environment for interactive theorem proving. I would define the theorem as a type and then construct a proof by providing a value of that type. The process is interactive because Epigram 2 provides feedback during the construction of the proof.
What are dependent types in Epigram 2?
Dependent types in Epigram 2 are types that can depend on values. This allows for more expressive type systems and can help to eliminate many common runtime errors at compile time.
How would you handle a situation where you need to refactor a large amount of Epigram 2 code?
I would start by understanding the existing codebase and identifying the areas that need refactoring. I would then plan out the refactoring process, breaking it down into manageable tasks. I would also ensure to test the code thoroughly after each change to make sure it still works as expected.

Epigram 2 application related

Product Perfect's Epigram 2 development capabilities

Beyond hiring for your Epigram 2 engineering team, you may be in the market for additional help. Product Perfect provides seasoned expertise in Epigram 2 projects, and can engage in multiple capacities.