Hiring guide for Erlang R16B03-1 Engineers

Erlang R16B03-1 Developer Hiring Guide

Erlang R16B03-1 is a robust computer programming language, developed by Ericsson in the 1980s for telecommunication systems. It was designed to handle large-scale concurrent activities, making it ideal for real-time systems and distributed computing applications. The language is known for its fault-tolerance and hot-swapping capabilities, which allow code updates without stopping the system. Erlang's syntax is inspired by Prolog and it supports functional programming with dynamic typing. This information can be referenced from "Programming Erlang: Software for a Concurrent World" by Joe Armstrong, one of the original creators of Erlang at Ericsson.

Ask the right questions secure the right Erlang R16B03-1 talent among an increasingly shrinking pool of talent.

First 20 minutes

General Erlang R16B03-1 app knowledge and experience

The first 20 minutes of the interview should seek to understand the candidate's general background in Erlang R16B03-1 application development, including their experience with various programming languages, databases, and their approach to designing scalable and maintainable systems.

What is the use of the spawn function in Erlang?
The spawn function in Erlang is used to create a new process. It takes a function as an argument and runs it in a separate process.
How would you handle errors in Erlang?
In Erlang, errors are handled using the 'let it crash' philosophy. This means that when an error occurs, the process that encountered the error is allowed to crash and a supervisor process then decides what action to take.
What are the advantages of using Erlang for concurrent programming?
Erlang provides lightweight processes, message passing concurrency, and built-in support for distribution. These features make it a good choice for concurrent programming.
Describe the difference between lists and tuples in Erlang.
In Erlang, lists are used when the number of elements can vary, while tuples are used when the number of elements is fixed. Lists are also used when elements need to be added or removed, while tuples are used when elements are just read.
How would you implement a recursive function in Erlang?
A recursive function in Erlang can be implemented by defining a function that calls itself. The function must also have a base case to prevent infinite recursion.
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What you’re looking for early on

Does the candidate have a solid understanding of Erlang R16B03-1?
Has the candidate demonstrated problem-solving skills during the interview?
Is the candidate able to communicate effectively?
Does the candidate have experience with concurrent programming?

Next 20 minutes

Specific Erlang R16B03-1 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 is the role of the OTP framework in Erlang?
The OTP (Open Telecom Platform) framework in Erlang provides a set of libraries and tools that are used to build robust, scalable, and maintainable applications.
Describe the difference between synchronous and asynchronous message passing in Erlang.
In synchronous message passing, the sender waits for the receiver to receive the message. In asynchronous message passing, the sender does not wait and can continue with other tasks.
How would you handle state in Erlang processes?
State in Erlang processes is handled by passing the state as an argument to the function that represents the process. The function can then return a new state as part of its result.
What are the benefits of immutability in Erlang?
Immutability in Erlang eliminates the risks of state changes, making the code easier to understand and debug. It also allows for more efficient use of resources in concurrent and distributed systems.
Describe the difference between hot and cold code loading in Erlang.
Hot code loading in Erlang allows for a new version of a module to be loaded and run without stopping the system. Cold code loading requires the system to be stopped before a new version of a module can be loaded.
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The ideal back-end app developer

What you’re looking to see on the Erlang R16B03-1 engineer at this point.

At this point, a skilled Erlang R16B03-1 engineer should demonstrate strong problem-solving abilities, proficiency in Erlang R16B03-1 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 Erlang R16B03-1.

What does this simple Erlang code do?
io:format("Hello, World!~n", []).
This code prints the string 'Hello, World!' to the console. The '~n' is a newline character.
What will be the output of this Erlang code?
io:format("~p~n", [1+2*3]).
The output will be '7'. The code performs the arithmetic operation 1+2*3, where multiplication has higher precedence, so it's calculated first. The '~p' is a placeholder for the result, which is then printed to the console.
What does this Erlang code do?
lists:map(fun(X) -> X*X end, [1,2,3,4,5]).
This code squares each element in the list [1,2,3,4,5]. The 'fun' keyword is used to define an anonymous function that takes an argument 'X' and returns the square of 'X'. The 'lists:map' function applies this anonymous function to each element of the list.
What does this Erlang code do?
spawn(fun() -> io:format("Hello from a new process~n", []) end).
This code spawns a new process that prints 'Hello from a new process' to the console. The 'spawn' function is used to create a new process in Erlang.

Wrap-up questions

Final candidate for Erlang R16B03-1 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 Erlang R16B03-1 application deployments. Inquire about their experience in handling system failures and their approach to debugging and troubleshooting.

How would you implement a distributed system in Erlang?
A distributed system in Erlang can be implemented using the built-in support for distribution. This includes the ability to spawn processes on remote nodes and send messages between processes on different nodes.
What are the key features of the Erlang programming language?
Key features of Erlang include support for concurrent programming, distribution, fault-tolerance, hot code loading, and a functional programming style.
Describe the difference between process-oriented and object-oriented programming in Erlang.
In process-oriented programming, which is used in Erlang, the focus is on processes and the messages they exchange. In object-oriented programming, the focus is on objects and their interactions.

Erlang R16B03-1 application related

Product Perfect's Erlang R16B03-1 development capabilities

Beyond hiring for your Erlang R16B03-1 engineering team, you may be in the market for additional help. Product Perfect provides seasoned expertise in Erlang R16B03-1 projects, and can engage in multiple capacities.