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Victor Bueno, United Kingdom

Freelance C# Developer at Toptal since April 27, 2014
Victor is a seasoned .NET developer with over 17 years of experience focusing on the Microsoft technology stack. He develops a wide range of software, including web apps, back-end services, databases, and mobile apps. He is particularly interested in high-performance multi-threaded development. Click to continue

Charles Cook, Ph.D., United States

Freelance C# Developer at Toptal since May 30, 2014
Charles has a Ph.D. in aerospace engineering and spent three years developing custom data processing and analysis programs for NASA. He specializes in scalable, enterprise-level application development and engineering solutions for exceptionally high throughputs. He is also the founder and owner of GreatVocab.com, for which he developed the core system using novel concepts in data analysis and control theory. Click to continue

Anne Adams, United Kingdom

Freelance C# Developer at Toptal since July 30, 2015
After building financial trading applications for 8 years as an engineer at Merrill Lynch, Anne has since gone on to found and build LoudUp, a music-based social network that she designed, built, and launched from the ground up. She specializes in .NET technologies and JavaScript. Click to continue

Johan Hernandez, Colombia

Freelance C# Developer at Toptal since January 3, 2012
Johan is a mobile app and cloud back-end developer with over 15 years of experience. He's been telecommuting for startups in the USA since 2010. He has worked with enterprise stacks for a number of years, but more recently his primary focus has been on building native apps for mobile and desktop (Mac, iOS, Android and Windows) using Swift, Objective-C, Java, Kotlin, and C#. He also builds his own RESTful back-ends with Rails, Node, and Golang. Click to continue

Konstantin Startsev, Russia

Freelance C# Developer at Toptal since November 11, 2013
Konstantin has 9+ years of software engineering experience, including a number of great jobs working with big companies and many jobs with start-up companies and medium-sized mobile and web agencies. Over the past few years, he has been developing web solutions for the automation of business processes using C# and ASP.NET MVC or Java with Play! Framework and various front-end frameworks (e.g., jQuery, AngularJS, KnockoutJS, TypeScript, etc.). Click to continue

Patrick Ryder, United States

Freelance C# Developer at Toptal since October 9, 2012
Pat has over a dozen years of experience developing applications on the .NET platform, including having been part of the development team at Microsoft which created the platform itself. He also develops for Windows native API (Win32/COM), he communicates extremely well, and he has worked in teams of all sizes. Click to continue

Dmitry Pavlov, Russia

Freelance C# Developer at Toptal since June 14, 2012
Dmitry is a senior .NET and C# developer with over 10 years of experience in creating web applications. He has received the Microsoft MVP (Visual C#) Award 7 times since 2008 and is a capable team leader. Dmitry has also achieved a MS in Computer Sciences and MS in Structural Geology and Modeling. Click to continue

John R. Kosinski, Thailand

Freelance C# Developer at Toptal since October 28, 2015
As a full-stack mobile developer, John has been developing since around 2000. Early on he did some C++, ASP, VB6, and other things; since .NET came out most of his work has been in .NET. His work experience up until 2009 was in the NYC and NYC area; since 2009 he's been living and working in Thailand. Currently he's consulting remotely for US clients, and working on iOS and Android projects. Click to continue

Richard Rozsa, Netherlands

Freelance C# Developer at Toptal since June 12, 2013
Richard Rozsa offers a vision of data as a self formatting entity. For more than 30 years, he's delivered top quality technical architecture, programming, testing and solutions for complex problems--on-time and within budget. He's extremely flexible and able to integrate as a standalone freelancer or within teams. Click to continue

Richard Hardebeck, United Kingdom

Freelance C# Developer at Toptal since February 2, 2016
Richard has worked at a broad range of companies from small startups to large multinationals with often overlapping roles of software developer, quantitative analyst, and financial market professional. He is comfortable with all aspects of software development, from writing efficient algorithms and data structures, designing full system architectures, and managing and improving interfaces with legacy code. Click to continue
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A hiring guide
The Vital Guide to C# Interviewing

C# came in as a new kid on the block. At first it was ignored, then it was ridiculed, and then it was fought against, but now it continues to win over developers all over the world. The direct result of this growth is a large number of developers that are using C#. This guide covers topics that every C# developer needs to have mastered, and is essential when making your next hire.

Testimonials
“My experience with Toptal has exceeded expectations. I needed to quickly find a front-end developer, and the first person they recommended was a perfect fit. A month later, I needed an iOS developer and they delivered again. I'm incredibly impressed with the quality of the people in Toptal's network and how quickly I was able to find a match for my needs. Greco is an amazing web developer. He has great attention to detail, in such a way that his websites look just like the design mockups we created on Photoshop. Not only that, but his code is very organized, and he proved to be very skilled in React.js. I couldn't have been happier with his contributions to our company. Vadim is a very experienced software engineer, particular in iOS. He was able to help us build our mobile app in record speed, and also contributed to major mobile and architecture decisions. Vadim is a proactive and intelligent engineer and has impressed us from day one.”
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“It has been wonderful to work with Fabian for the past two years. He is an expert in JavaScript development and has built our embeddable widget and video player. He is a quick study and is able to learn how to integrate new technologies, which is so critical for a startup. He even took the extra effort to teach others on the team. He is super responsive and often went above and beyond to help us meet deadlines (including working on weekends). Thank you Fabian. Thank you Toptal for making it so easy to find and work with amazing talent.”
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“As a growing startup, finding top-notch engineering talent at affordable rates is one of the biggest challenges. After being frustrated with unreliable local contractors in New York, we turned to Toptal. We worked closely with Michal in Poland for 5 months and were thrilled with the results. Michal was an outstanding engineer who communicated flawlessly and took control of our project in ways that far exceeded my expectations. I give Michal and Toptal my highest endorsement and will continue to use and recommend them to anyone looking for software engineering talent.”
David Baker
Founder @ Spins.FM
“We're a small firm with big dreams. After trying 4 or 5 local or outsourced developers, we were out of options. I'd heard of Toptal, but was worried that my company wasn't big enough for them. After calling them up, I found out that I didn't need to meet any minimum budget and was immediately put in touch with a developer to talk through my problems and goals. A day later, he got back to me with a list of possible solutions. After 9 months and 5 developers, Toptal got me my solution in a single week at a price I could afford.”
Kevin Ramirez
Co-Founder @ SixtyVocab.com
“Dario was recently assigned to our company in order to help with PHP and JW Video player refinements. He listens extremely well and offers common sense suggestions that save both time and money. He speeds up the process by asking great questions, and he just delivered our first project on time. His redesigned player offers a very pleasing appearance and delivers functions that are both elegant and intuitive.”
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Director, Product Management @ Rand McNally
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Victor BuenoUnited Kingdom
Victor is a seasoned .NET developer with over 17 years of experience focusing on the Microsoft technology stack. He develops a wide range of software, including web apps, back-end services, databases, and mobile apps. He is particularly interested in high-performance multi-threaded development.
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C#T-SQLJavaScriptASP.NET.NETAgile Software DevelopmentAJAXSQL Server
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Charles Cook, Ph.D.United States
Charles has a Ph.D. in aerospace engineering and spent three years developing custom data processing and analysis programs for NASA. He specializes in scalable, enterprise-level application development and engineering solutions for exceptionally high throughputs. He is also the founder and owner of GreatVocab.com, for which he developed the core system using novel concepts in data analysis and control theory.
[click to continue…]
C#ASP.NET WebformsASP.NET Web API 2ASP.NET MVCASP.NETGitWindows
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Anne AdamsUnited Kingdom
After building financial trading applications for 8 years as an engineer at Merrill Lynch, Anne has since gone on to found and build LoudUp, a music-based social network that she designed, built, and launched from the ground up. She specializes in .NET technologies and JavaScript.
[click to continue…]
C#SQLASP.NET AJAXASP.NET MVC 3ASP.NET MVC 4ASP.NET MVC 5ASP.NET WebformsASP.NETASP.NET MVCGoogle Places APIjQueryFacebook APISoundCloud API
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Johan HernandezColombia
Johan is a mobile app and cloud back-end developer with over 15 years of experience. He's been telecommuting for startups in the USA since 2010. He has worked with enterprise stacks for a number of years, but more recently his primary focus has been on building native apps for mobile and desktop (Mac, iOS, Android and Windows) using Swift, Objective-C, Java, Kotlin, and C#. He also builds his own RESTful back-ends with Rails, Node, and Golang.
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Konstantin StartsevRussia
Konstantin has 9+ years of software engineering experience, including a number of great jobs working with big companies and many jobs with start-up companies and medium-sized mobile and web agencies. Over the past few years, he has been developing web solutions for the automation of business processes using C# and ASP.NET MVC or Java with Play! Framework and various front-end frameworks (e.g., jQuery, AngularJS, KnockoutJS, TypeScript, etc.).
[click to continue…]
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Patrick RyderUnited States
Pat has over a dozen years of experience developing applications on the .NET platform, including having been part of the development team at Microsoft which created the platform itself. He also develops for Windows native API (Win32/COM), he communicates extremely well, and he has worked in teams of all sizes.
[click to continue…]
C#T-SQLC++.NETASP.NET MVCASP.NETMicrosoft Visual StudioWindows ServerWindowsSQL Server
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Dmitry PavlovRussia
Dmitry is a senior .NET and C# developer with over 10 years of experience in creating web applications. He has received the Microsoft MVP (Visual C#) Award 7 times since 2008 and is a capable team leader. Dmitry has also achieved a MS in Computer Sciences and MS in Structural Geology and Modeling.
[click to continue…]
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John R. KosinskiThailand
As a full-stack mobile developer, John has been developing since around 2000. Early on he did some C++, ASP, VB6, and other things; since .NET came out most of his work has been in .NET. His work experience up until 2009 was in the NYC and NYC area; since 2009 he's been living and working in Thailand. Currently he's consulting remotely for US clients, and working on iOS and Android projects.
[click to continue…]
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Richard RozsaNetherlands
Richard Rozsa offers a vision of data as a self formatting entity. For more than 30 years, he's delivered top quality technical architecture, programming, testing and solutions for complex problems--on-time and within budget. He's extremely flexible and able to integrate as a standalone freelancer or within teams.
[click to continue…]
C#C++CSQLASP.NETASP.NET MVC.NETjQueryMS Visual StudioVisual Studio 2008SQL Server Management StudioMicrosoft Visual C++Visual Studio
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Richard HardebeckUnited Kingdom
Richard has worked at a broad range of companies from small startups to large multinationals with often overlapping roles of software developer, quantitative analyst, and financial market professional. He is comfortable with all aspects of software development, from writing efficient algorithms and data structures, designing full system architectures, and managing and improving interfaces with legacy code.
[click to continue…]
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The Vital Guide to C# Interviewing

Remember the Y2K bug? Apparently, the world was supposed to end due to havoc in computer networks all over the planet. Just one year before that, we heard announcements that 1999 will mark the end of the world because it had an inverted 666 in its name. In such turbulent times, when many were piling food in their basements, hoping that Armageddon would not find them, there were a few visionaries that were still inventing some cool stuff. One of them is Anders Hejlsberg, who gathered a team of Microsoft developers and created Cool, which was the first version of new C-like Object Oriented Language, later to be named C#.

14 years and 5 versions later, C# is one of the most popular languages in the industry. Despite the fact that James Gosling and Bill Joy stated that C# was just an imitation of Java, while some other critics even called C# a boring repetition that lacks innovation, C# is now standing tall next to all the other platforms used by millions of developers all over the world.

C# is a multi-paradigm programming language encompassing strong typing, as well as imperative, declarative, functional, generic, object-oriented (class-based), and component-oriented programming disciplines. You can use it to build any type of application, whether it is a service, console, desktop, web or even smartphone application.

Each application type requires a specific set of skills on top of standard C# syntax, and finding a great C# developer is not an easy task. If you are looking for a web developer you should expect knowledge of the HTTP protocol, Web Forms, MVC Framework and Razor View Engine, while some other application will have its own challenges.

This article should help you identify a developer that understands C# in its core. Regardless on the application type, techniques and tips mentioned below should be universal to all C# developers and they should all be able to demonstrate extensive understanding of these topics.

I’ll try to cover general topics that every developer must be aware of. The purpose of this article is to point to several specific topics. Evaluating knowledge of each of them in depth would require much more than one or two questions.

Generics

Generics were one of the earliest features of the C# language. Generics make it possible to design classes and methods that defer the specification of one or more types until the class or method is declared and instantiated by client code.

Q: Consider the following code, which is part of a console application:

static void Main(string[] args)
{
  DeveloperList listOfDevelopers = new DeveloperList();
  IntegerList listOfNumbers = new IntegerList();
  
  listOfNumbers.DoSomething(5);
  listOfDevelopers.DoSomething(new Developer());
}

public class Developer
{
  public string Name { get; set; }
  public List<string> Skills { get; set; }
}

public class DeveloperList
{
  public void DoSomething(Developer developer)
  {
    Console.WriteLine("Doing something with developer");
  }
}

public class IntegerList
{
  public void DoSomething(Int32 number)
  {
    Console.WriteLine("Doing something with number");
  }
}

Optimize the code in a way to replace DeveloperList and IntegerList with one class named GenericList that will contain single doSomething method. Make sure to handle the case when GenericList is instantiated by an unexpected type.

The solution should be similar to this:

static void Main(string[] args)
{
  GenericList<int> listOfNumbers = new GenericList<int>();
  GenericList<Developer> listOfDevelopers = new GenericList<Developer>();
  GenericList<string> listOfStrings = new GenericList<string>();
  
  listOfNumbers.DoSomething(5);
  listOfDevelopers.DoSomething(new Developer());
  listOfStrings.DoSomething("Whats up");
}

public class Developer
{
  public string Name { get; set; }
  public List<string> Skills { get; set; }
}

class GenericList<T>
{
  public void DoSomething(T value){
  if (value.GetType() == typeof(Int32))
      {
          Console.WriteLine("Doing something with ");
            return;
        }

        if (value.GetType() == typeof(Developer))
        {
            Console.WriteLine("Doing something with developer");
            return;
        }

        Console.WriteLine("I cannot do anything with " + value.GetType().ToString());
  }
}

LINQ

LINQ (Language-Integrated Query) is one of the coolest features in C#. It was introduced in Visual Studio 2008 and it provides extremely powerful query capabilities to C#. LINQ introduces standard patterns for querying and updating data supporting any kind of data store.

Or, in simple words, LINQ enables SQL-like queries against collections of objects in C#.

Q: Assuming that you have a Class Developer defined like this:

class Developer
{
  public string Name { get; set; }
  public List<string> Skills { get; set; }
}

Write a code that would extract all developers that have the “SQL” skill, from a List<Developer> developers.

The answer that you would expect from a developer that understands LINQ would be similar to this:

var results = from d in developers where d.Skills.Contains("SQL") select d;

Developers that are not used to LINQ would probably use standard iteration methods using for, foreach or while combined with if. Similar to this:

var results = new List<Developer>();
foreach (var d in developers)
{
  if (d.Skills.Contains("SQL"))
  results.Add(d);
}

Even though this is a technically correct solution, it would be less desirable due to the complexity of the code.

Lambda Expressions

Lambda expressions are methods that do not require declaration. These are function that are implemented “in-line” with the rest of the code. Lambda expressions are particularly helpful for writing LINQ query expressions.

To create a lambda expression, you specify input parameters (if any) on the left side of the lambda operator =>, and you put the expression or statement block on the other side. For example, the lambda expression x => x * x specifies a parameter named x and returns the value of x squared.

The general definition of lambda expression is:

(parameters) => Code

Q: Complete the following code by implementing the methods Square and Double based on the Calculate delegate and lambda expressions.

delegate int Calculate(int input);
static void Main(string[] args)
{
  int value1 = Square(5);
  int value2 = Double(5);
  
  Console.WriteLine(value1);
  Console.WriteLine(value2);
  
  Console.ReadLine();
}

The expected solution should be as simple as adding two lines of code:

delegate int Calculate(int input);
static void Main(string[] args)
{
  Calculate Square = x => x * x;  // NEW
  Calculate Double = x => x * 2;  // NEW
  
  int value1 = Square(5);
  int value2 = Double(5);
  
  Console.WriteLine(value1);
  Console.WriteLine(value2);
  
  Console.ReadLine();
}

The Calculate delegate is declared to return Int and accept one Int as a parameter, so Square and Double methods just implemented the proper calculations.

Named Arguments

Named arguments free you from the need to remember or to look up the order of parameters in the parameter lists of called methods. The parameter for each argument can be specified by parameter name.

Consider the following code:

static void Main(string[] args)
{
  Console.WriteLine(Power(4, 3)); //64
  Console.WriteLine(Power(3, 4)); //81
}

static double Power(double baseNumber, double power)
{
  return Math.Pow(baseNumber, power);
}

Changing the order of parameters passed to the Power method would produce a different result; 64 one way, versus 81 the other.

Q: Update the code above to produce same result (4 to power of 3 = 64) regardless of the order of parameters passed to the Power method.

The solution for this problem is to pass named parameters. You would have to change the way you call Power.

Console.WriteLine(Power(baseNumber: 4, power: 3)); //64
Console.WriteLine(Power(power: 3, baseNumber: 4)); //64

The only thing you needed to do is add an argument name when passing in the values.

Optional Parameters

The definition of a method, constructor, indexer, or delegate can specify that its parameters are required or that they are optional. Any call must provide arguments for all required parameters, but can omit arguments for optional parameters.

Each optional parameter has a default value as part of its definition. If no argument is sent for that parameter, the default value is used. Optional parameters are defined at the end of the parameter list, after any required parameters. If the caller provides an argument for any one of a succession of optional parameters, it must provide arguments for all preceding optional parameters. Comma-separated gaps in the argument list are not supported.

Q: Extend the Developer class with a boolean property named Enabled and a constructor that will accept name and the optional enabled value.

public class Developer
{
  public string Name { get; set; }
  public List<string> Skills { get; set; }
}

The expected solution would be:

public class Developer
{
  public Developer(string name, bool enabled=true)
  {
    Name = name;
    Enabled = enabled;
  }
  public string Name { get; set; }
  public bool Enabled { get; set; }
  public List<string> Skills { get; set; }
}

Use of the optional enabled parameter is shown in the following example:

Developer elvis = new Developer("Elvis");       //elvis.Enabled = true
Developer mick = new Developer("Mick", false);  //mick.Enabled = false

Asynchronous Processing

Asynchrony is essential for activities that are potentially blocking, such as when your application accesses network resources. Access to a network resource sometimes is slow or delayed. If such an activity is blocking a synchronous process, the entire application must wait. In an asynchronous process, the application can continue with other work that doesn’t depend on the network resource until the potentially blocking task finishes.

Visual Studio 2012 introduced a simplified approach, async programming, that leverages asynchronous support in the .NET Framework 4.5 and the Windows Runtime. The compiler does the difficult work that the developer used to do, and your application retains a logical structure that resembles synchronous code. As a result, you get all the advantages of asynchronous programming with a fraction of the effort.

The async and await keywords in C# are the heart of async programming. By using those two keywords, you can use resources in the .NET Framework or the Windows Runtime to create an asynchronous method almost as easily as you create a synchronous method. Asynchronous methods that you define by using async and await are referred to as async methods.

The following example shows an async method.

async Task<int> AccessTheWebAsync()
{
  HttpClient client = new HttpClient();
  Task<string> getStringTask = client.GetStringAsync("https://www.toptal.com");
  DoIndependentWork();
  string urlContents = await getStringTask;
  return urlContents.Length;
}

Q: What would be the output of the following code? Explain your answer.

static string statement = "Start";

static async Task<string> SayAwaited()
{
  await Task.Delay(5000);
  statement = "Awaited";
  Console.WriteLine(statement);
  return statement;
}

static async Task<string> SayDelayed()
{
  Thread.Sleep(1000);
  statement = "Delayed";
  Console.WriteLine(statement);
  return statement;
}

static void Main(string[] args)
{
  SayAwaited();
  SayDelayed();
  Console.WriteLine("Final: " + statement);
  Console.ReadLine();
}

After five seconds of the application being paused, the output of this code would be:

Delayed
Final: Delayed
Awaited

Note: The first “Delayed” will show up after a delay of one second.

The reason for this is in the way async methods are handled in C#, and the difference between Task.Delay and Thread.Sleep. The SayAwaited method will execute like any other method until it reaches the await command. At this point, C# will start another thread for executing Task.Delay on the new thread, while releasing current thread to proceed with next action, which is SayDelayed. After putting the main thread to sleep for one second, SayDelayed will set the value for the statement and execution will proceed with the remaining commands, WriteLine and ReadLine. While this is all happening, SayAwaited will be nicely paused in its own thread, and after 5 seconds it will set statement to “Awaited”, produce its own output, and return.

Q: Would there be any difference if statement = "Awaited" would be execute before await command? Explain your answer.

static async Task<string> SayAwaited()
{
  statement = "Awaited";
  await Task.Delay(5000);
  Console.WriteLine(statement);
  return statement;
}

In this case, the output would be the following:

Delayed
Final: Delayed
Delayed

The reason for this is that the “Awaited” value is assigned to statement before the await command is called. By the time Console.WriteLine(statement); in SayAwaited is executed, the value of statement has already been updated by the SayDelayed method.

Stay Sharp!

C# came in as a new kid on the block. At first it was ignored, then it was ridiculed, then it was fought against. Now it continues to win over developers all over the world. The direct result of this growth is the large number of developers that are using C#.

This article referenced topics that every C# developer should master. Make sure to cover these topic when you are looking for a great C# developer, and you will be one step closer to identifying the best of the best.

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