Hiring guide for Elixir Benchmarks Engineers

Elixir Benchmarks Developer Hiring Guide

Elixir Benchmarks is a powerful computer software programming language, developed for high scalability and maintainability. It was created by José Valim in 2011, who sought to improve the Ruby on Rails framework's performance. Elixir runs on the Erlang virtual machine (BEAM), known for its low-latency, fault-tolerant systems, and distributed computing capabilities. Its functional programming style promotes concurrent processes and supports hot-swapping of code, making it ideal for real-time systems. With its robust ecosystem and growing community, Elixir continues to be a popular choice among developers globally.

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

First 20 minutes

General Elixir Benchmarks app knowledge and experience

The first 20 minutes of the interview should seek to understand the candidate's general background in Elixir Benchmarks 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 language?
I have been working with Elixir for over 5 years now. I have used it to build highly concurrent and scalable applications, and have a deep understanding of its syntax, data types, and concurrency model.
What are the advantages of using Elixir for benchmarking?
Elixir is highly concurrent and fault-tolerant, making it ideal for benchmarking. It also has excellent support for distributed systems, and its functional programming nature makes it easier to write predictable, maintainable code.
How would you set up a benchmarking test in Elixir?
I would use the Benchee library to set up a benchmarking test in Elixir. I would define the functions I want to benchmark in a map, and then pass that map to Benchee.run. I would also specify the time and warmup values for the test.
Describe the difference between concurrency and parallelism, and how they relate to Elixir.
Concurrency is about dealing with multiple tasks at the same time, while parallelism is about executing multiple tasks at the same time. Elixir is a concurrent language, meaning it can easily handle many tasks at once. It also supports parallelism through its Erlang-based actor model.
What is the role of the BEAM in Elixir?
BEAM is the Erlang virtual machine on which Elixir runs. It provides the runtime environment for Elixir applications, and handles scheduling, memory management, and other low-level details.
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What you’re looking for early on

Does the candidate demonstrate a strong understanding of Elixir language and its syntax?
Is the candidate familiar with benchmarking tools and methodologies?
Can the candidate effectively troubleshoot and debug Elixir code?
Has the candidate worked with concurrent and distributed systems?

Next 20 minutes

Specific Elixir Benchmarks 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 handle a situation where a benchmark test is not performing as expected?
I would first try to identify the cause of the problem, possibly by adding additional logging or using a profiling tool. I would then make the necessary changes to the code and rerun the test to see if performance has improved.
What are some ways to optimize Elixir code for better performance?
Some ways to optimize Elixir code include using built-in functions and data structures effectively, avoiding unnecessary computations, and making use of Elixir's concurrency features to perform tasks in parallel.
Describe the difference between Elixir and Erlang. Why might you choose one over the other?
Elixir and Erlang are both functional programming languages that run on the BEAM virtual machine. Elixir has a more modern and user-friendly syntax, while Erlang has been around longer and has a larger ecosystem. The choice between the two would depend on the specific needs of the project.
How would you use Elixir's metaprogramming features in a benchmarking context?
Elixir's metaprogramming features can be used to generate benchmarking code dynamically. For example, you could use macros to define a series of similar benchmark tests without having to write each one out manually.
What are some challenges you might face when benchmarking Elixir code, and how would you overcome them?
Some challenges might include dealing with non-deterministic code, handling external dependencies, and managing the performance impact of the benchmarking process itself. These can be overcome through careful test design, isolation of dependencies, and use of appropriate benchmarking tools and techniques.
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The ideal back-end app developer

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

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

What does the following Elixir code do?
IO.puts "Hello, World!"
This code prints the string 'Hello, World!' to the console.
What will be the output of the following Elixir code?
IO.inspect(Enum.map([1, 2, 3, 4], fn x -> x * 2 end))
This code will output the list [2, 4, 6, 8]. It uses the Enum.map function to iterate over the list [1, 2, 3, 4] and multiplies each element by 2.
What does the following Elixir code do?
Enum.reduce([1, 2, 3], 0, fn x, acc -> x + acc end)
This code sums up the numbers in the list [1, 2, 3]. It uses the Enum.reduce function, which takes a list, an initial accumulator value (0 in this case), and a function that describes how to update the accumulator (by adding the current list element to it).
What does the following Elixir code do?
spawn(fn -> 1 + 2 end)
This code creates a new process that executes the function 'fn -> 1 + 2 end'. The spawn function is used in Elixir for creating new processes for concurrency.

Wrap-up questions

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

How would you benchmark a distributed Elixir application?
Benchmarking a distributed Elixir application would involve setting up tests that simulate the distributed environment, such as multiple nodes and network latency. I would use tools like Benchee and ExUnit for this purpose.
What is the GenServer in Elixir and how it can be used in benchmarking?
GenServer is a behaviour module for implementing the server of a client-server relation in Elixir. In benchmarking, GenServer can be used to manage state and handle requests in a concurrent and fault-tolerant manner.
Describe the difference between sync and async testing in Elixir.
In sync testing, tests are run one after the other, while in async testing, tests can be run concurrently. Async testing can be faster, but it may also introduce non-determinism if tests are not properly isolated.

Elixir Benchmarks application related

Product Perfect's Elixir Benchmarks development capabilities

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