Hiring guide for Elixir Calendar Engineers

Elixir Calendar Developer Hiring Guide

Elixir Calendar is a computer programming language designed by José Valim and released in 2014. It is a functional language built on top of the Erlang VM and designed to be used for building scalable, concurrent applications. Elixir Calendar is influenced by languages such as Ruby, Haskell, and Erlang. The language is named after the Irish holiday of Lá na Cásca, which celebrates the resurrection of Jesus Christ.

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

First 20 minutes

General Elixir Calendar app knowledge and experience

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

What is your experience with Elixir?
I have been working with Elixir for over 3 years now, developing various applications including web services and APIs.
How would you handle errors in Elixir?
Elixir provides a mechanism called 'exceptions' for handling errors. I would use try, catch, and rescue to handle exceptions and ensure the application continues to run smoothly.
What are the advantages of using Elixir for developing a calendar application?
Elixir is highly concurrent and fault-tolerant, which makes it ideal for applications that require real-time updates and high availability, like a calendar application.
Describe the difference between Elixir and other programming languages you have used.
Elixir is a functional programming language that runs on the Erlang virtual machine, which makes it different from object-oriented languages like Java or Python. It also has built-in support for concurrency, which many other languages lack.
How would you implement recurring events in a calendar application using Elixir?
I would use a combination of Elixir's built-in date and time functionality and a database to store and retrieve recurring events. The logic for calculating occurrences of a recurring event would be implemented in Elixir.
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What you’re looking for early on

Does the candidate have a deep understanding of Elixir?
Has the candidate demonstrated their problem-solving skills?
Can the candidate work with databases?
Does the candidate have experience with calendar systems or similar applications?

Next 20 minutes

Specific Elixir Calendar 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 Elixir's concurrency and fault-tolerance features, and how would they be useful in a calendar application?
Elixir's concurrency features allow multiple processes to run simultaneously, and its fault-tolerance features allow the application to recover from errors without crashing. These features would be useful in a calendar application to handle multiple users and events at the same time, and to ensure the application remains available even when errors occur.
Describe the difference between Elixir's process-based concurrency and thread-based concurrency in other languages.
In Elixir, concurrency is achieved through processes, which are isolated from each other and communicate through message passing. This is different from thread-based concurrency, where threads share memory and can interfere with each other, leading to issues like race conditions.
How would you handle time zones in a calendar application developed with Elixir?
Elixir has built-in support for time zones through the DateTime module. I would use this module to handle time zone conversions and ensure events are displayed at the correct local time for each user.
What are Elixir's metaprogramming features, and how would you use them in a calendar application?
Elixir's metaprogramming features allow code to generate and modify other code. In a calendar application, I could use metaprogramming to generate code for recurring events based on different recurrence rules.
Describe the difference between Elixir's 'let it crash' philosophy and traditional error handling.
In Elixir, the 'let it crash' philosophy means that when an error occurs, the process that encountered the error is allowed to crash, and a supervisor process then restarts it. This is different from traditional error handling, where errors are caught and handled immediately.
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The ideal back-end app developer

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

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

What does this Elixir code do?
IO.puts Date.utc_today()
This code will print today's date in UTC.
What will be the output of the following Elixir code?
IO.puts Integer.to_string(10, 16)
This code will print the hexadecimal representation of the number 10, which is 'a'.
What does this Elixir code do?
IO.inspect Enum.map([1, 2, 3], fn x -> x * 2 end)
This code will transform the given list by multiplying each element by 2 and then print the new list. The output will be [2, 4, 6].
What will be the output of the following Elixir code?
IO.inspect Task.async(fn -> 1 + 2 end) |> Task.await()
This code will start a new process, execute the anonymous function (which adds 1 and 2) in that process, and wait for the result. The output will be 3.

Wrap-up questions

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

How would you ensure data consistency in a calendar application developed with Elixir?
I would use Elixir's built-in support for atomic transactions and optimistic locking to ensure data consistency. I would also use tests to verify the correctness of the application's data handling logic.
What are Elixir's testing tools, and how would you use them to test a calendar application?
Elixir provides a testing framework called ExUnit, as well as tools for property-based testing and mocking. I would use these tools to write unit tests, integration tests, and end-to-end tests for the calendar application.
Describe the difference between Elixir's GenServer and Agent.
GenServer and Agent are both abstractions for managing state in Elixir. The main difference is that GenServer provides more flexibility and control, but is also more complex, while Agent is simpler and easier to use, but provides less control.

Elixir Calendar application related

Product Perfect's Elixir Calendar development capabilities

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