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Elixir is a functional programming language designed by José Valim, first released in 2012. It is built on top of the Erlang VM and is used primarily for building scalable web applications. Elixir is designed to be a modern, performant, and safe language that is easy to learn and use. It features a rich standard library and a vibrant community of users and developers. Sources: - [Elixir Language Website](https://elixir-lang.org/) - [Elixir Wikipedia Page](https://en.wikipedia.org/wiki/Elixir_(programming_language))

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

First 20 minutes

General Elixir Umbrella Projects app knowledge and experience

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

Can you explain the purpose of Elixir umbrella projects?

Elixir umbrella projects allow you to maintain and organize separate applications within a single repository. This can be useful for managing microservices or large projects with separate concerns.

How would you start an umbrella project in Elixir?

You can start an umbrella project in Elixir by running the command 'mix new project_name --umbrella' in your terminal.

What are some benefits of using umbrella projects in Elixir?

Umbrella projects in Elixir provide a way to split your codebase into multiple smaller applications, each with its own specific responsibilities. This can enhance code clarity, isolation, and reusability.

Describe the difference between umbrella projects and regular projects in Elixir.

The main difference is that regular projects in Elixir are single applications, while umbrella projects can contain multiple applications. Each application in an umbrella project can be developed, tested, and deployed independently.

How would you add a new application to an existing umbrella project in Elixir?

You can add a new application to an existing umbrella project in Elixir by running the command 'mix new app_name' inside the 'apps' directory of the umbrella project.

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What you’re looking for early on

Does the candidate have a solid understanding of Elixir language and its syntax?

Can the candidate explain how they have used Umbrella Projects in their previous work?

Does the candidate demonstrate good problem-solving skills?

How well does the candidate understand OTP (Open Telecom Platform) principles?

Next 20 minutes

Specific Elixir Umbrella Projects 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.

Can applications within an Elixir umbrella project depend on each other?

Yes, applications within an Elixir umbrella project can depend on each other. Dependencies between applications are specified in the 'mix.exs' file of each application.

What happens if two applications in an umbrella project have conflicting dependencies?

If two applications within an umbrella project have conflicting dependencies, Elixir's dependency resolution will fail and you will receive an error. You will need to resolve the conflict manually.

How would you run tests for all applications in an Elixir umbrella project?

You can run tests for all applications in an Elixir umbrella project by running the command 'mix test' in the root directory of the umbrella project.

How would you organize shared code between applications in an Elixir umbrella project?

Shared code between applications in an Elixir umbrella project can be organized into a separate application within the project. This application can then be added as a dependency to the applications that need it.

What are some drawbacks of using Elixir umbrella projects?

Some drawbacks of using Elixir umbrella projects include increased complexity, and potential difficulties with dependency management and deployment.

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

What does this Elixir code do: `IO.puts "Hello, World!"`?
IO.puts "Hello, World!"
This Elixir code prints the string 'Hello, World!' to the console.
What does this Elixir code do: `defmodule Greeting do def say_hello(name), do: "Hello, #{name}" end`?
defmodule Greeting do def say_hello(name), do: "Hello, #{name}" end
This Elixir code defines a module named 'Greeting' with a function 'say_hello'. The function takes a parameter 'name' and returns a string greeting that person.
What does this Elixir code do: `Enum.map([1, 2, 3, 4], fn x -> x * 2 end)`?
Enum.map([1, 2, 3, 4], fn x -> x * 2 end)
This Elixir code maps over the list [1, 2, 3, 4] and doubles each element, returning a new list [2, 4, 6, 8].
What does this Elixir code do: `spawn(fn -> 1 + 2 end)`?
spawn(fn -> 1 + 2 end)
This Elixir code spawns a new process that executes the function `fn -> 1 + 2 end`, which adds 1 and 2 together. The result is not captured or returned, as the function is run in a separate, asynchronous process.

Wrap-up questions

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

How would you deploy an Elixir umbrella project?

You can deploy an Elixir umbrella project as a whole, or deploy each application within the project separately. The exact deployment process would depend on your specific deployment environment.

How does Elixir handle shared dependencies in umbrella projects?

Elixir handles shared dependencies in umbrella projects by fetching and compiling the shared dependencies only once and reusing them across all applications in the project.

What happens when you run 'mix compile' in the root of an umbrella project?

When you run 'mix compile' in the root of an umbrella project, Elixir compiles all applications in the project. The applications are compiled in an order that respects their interdependencies.

Elixir Umbrella Projects application related

Product Perfect's Elixir Umbrella Projects development capabilities

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

Elixir Umbrella Projects Consultive assessments

Elixir Umbrella Projects Application Conversion Assessment Elixir Umbrella Projects Application Integration Assessment Elixir Umbrella Projects Data & Database Integration Assessment

Custom Elixir Umbrella Projects development projects

Custom Elixir Umbrella Projects App Conversion Elixir Umbrella Projects Custom App Development Process App UI Design for Elixir Umbrella Projects Facelifts

Hiring guide for Elixir Umbrella Projects Engineers

Elixir Umbrella Projects Developer Hiring Guide

What you’re looking for early on

The ideal back-end app developer

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

Elixir Umbrella Projects Consultive assessments

Custom Elixir Umbrella Projects development projects