Toptal is a marketplace for top C# developers, engineers, programmers, coders, architects, and consultants. Top companies and startups can hire dedicated (full-time), hourly, or part-time C# freelancers for their mission-critical software projects.
United StatesFreelance C# Developer at Toptal Since June 5, 2014
Rory is a software consultant delivering solutions to fill enterprise needs. He brings technical skill and experience guiding teams in not just how to build, but what to build. He has extensive experience on the Microsoft web stack, including ASP.NET MVC, Web API, SQL Server, and Azure.
United StatesFreelance C# Developer at Toptal Since April 28, 2016
Dan is a software architect and technology professional focusing on applications of blockchain technologies. He has years of experience providing professional consulting services to clients ranging from startups to global corporations. He specializes in bringing rigorous testing and bulletproof code to tough engineering challenges. He has deep expertise in many aspects of artificial intelligence, blockchain, machine learning, and automation.
United StatesFreelance C# Developer at Toptal Since February 4, 2016
United StatesFreelance C# Developer at Toptal Since June 18, 2020
Scott has produced technology used by companies like Microsoft and S&P Global. He has developed software integral for companies selling to larger entities, as well as in taking companies public via IPO. Scott has the ability to design, develop, and deliver database solutions into a production environment. He is capable of controlling every aspect of a software development team as an architect, developer, and project leader.
IndiaFreelance C# Developer at Toptal Since April 30, 2014
Mukesh has over 16 years of software development and design experience specializing in the Microsoft technology stack and a proven ability to develop efficient, scalable, and fault-tolerant solutions to complex problems. He has extensive experience with all phases of the software development cycle.
United StatesFreelance C# Developer at Toptal Since July 29, 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.
RussiaFreelance C# Developer at Toptal Since July 16, 2012
Dmitry is a top-notch developer with over twenty years of experience creating .NET web applications. He mostly deals with ASP.NET Core and Blazor (C#, .NET Core) software development and architecture design these days. Dmitry has received the Microsoft MVP (Developer Technologies) Award 9 times and is a capable community leader. He has also received a Master of Science degrees in computer science and structural geology and modeling. Clients call him "The Coding Machine."
United StatesFreelance C# Developer at Toptal Since September 12, 2018
Claudio is a seasoned IT specialist focused on business outcomes, along with having a solid engineering background. He's applied data science to optimize customer satisfaction, product personalization, and customer churn. Claudio is also a certified SharePoint expert and has worked with prominent Microsoft customers, helping them to maximize security, performance, and usability.
C# software developers are experts in developing code, both for the .NET framework and platforms where .NET can be deployed, like Azure and Unity. This guide features hiring process best practices, job description tips, and interview questions and answers that will help you identify the best C# candidates.
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Despite accelerating demand for coders, Toptal prides itself on almost Ivy League-level vetting.
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What our clients think
Clients Rate Toptal C# Developers4.4 / 5.0on average across 1,071 reviews as of Mar 2, 2024
Tripcents wouldn't exist without Toptal. Toptal Projects enabled us to rapidly develop our foundation with a product manager, lead developer, and senior designer. In just over 60 days we went from concept to Alpha. The speed, knowledge, expertise, and flexibility is second to none. The Toptal team were as part of tripcents as any in-house team member of tripcents. They contributed and took ownership of the development just like everyone else. We will continue to use Toptal. As a startup, they are our secret weapon.
Brantley Pace, CEO & Co-Founder
I am more than pleased with our experience with Toptal. The professional I got to work with was on the phone with me within a couple of hours. I knew after discussing my project with him that he was the candidate I wanted. I hired him immediately and he wasted no time in getting to my project, even going the extra mile by adding some great design elements that enhanced our overall look.
Paul Fenley, Director
K Dunn & Associates
The developers I was paired with were incredible -- smart, driven, and responsive. It used to be hard to find quality engineers and consultants. Now it isn't.
Ryan Rockefeller, CEO
Toptal understood our project needs immediately. We were matched with an exceptional freelancer from Argentina who, from Day 1, immersed himself in our industry, blended seamlessly with our team, understood our vision, and produced top-notch results. Toptal makes connecting with superior developers and programmers very easy.
Jason Kulik, Co-Founder
As a small company with limited resources we can't afford to make expensive mistakes. Toptal provided us with an experienced programmer who was able to hit the ground running and begin contributing immediately. It has been a great experience and one we'd repeat again in a heartbeat.
Stuart Pocknee , Principal
Site Specific Software Solutions
We used Toptal to hire a developer with extensive Amazon Web Services experience. We interviewed four candidates, one of which turned out to be a great fit for our requirements. The process was quick and effective.
Abner Guzmán Rivera, CTO and Chief Scientist
Sergio was an awesome developer to work with. Top notch, responsive, and got the work done efficiently.
Dennis Baldwin, Chief Technologist and Co-Founder
Working with Marcin is a joy. He is competent, professional, flexible, and extremely quick to understand what is required and how to implement it.
André Fischer, CTO
We needed a expert engineer who could start on our project immediately. Simanas exceeded our expectations with his work. Not having to interview and chase down an expert developer was an excellent time-saver and made everyone feel more comfortable with our choice to switch platforms to utilize a more robust language. Toptal made the process easy and convenient. Toptal is now the first place we look for expert-level help.
Derek Minor, Senior VP of Web Development
Networld Media Group
Toptal's developers and architects have been both very professional and easy to work with. The solution they produced was fairly priced and top quality, reducing our time to launch. Thanks again, Toptal.
Jeremy Wessels, CEO
We had a great experience with Toptal. They paired us with the perfect developer for our application and made the process very easy. It was also easy to extend beyond the initial time frame, and we were able to keep the same contractor throughout our project. We definitely recommend Toptal for finding high quality talent quickly and seamlessly.
Ryan Morrissey, CTO
Applied Business Technologies, LLC
I'm incredibly impressed with Toptal. Our developer communicates with me every day, and is a very powerful coder. He's a true professional and his work is just excellent. 5 stars for Toptal.
Pietro Casoar, CEO
Ronin Play Pty Ltd
Working with Toptal has been a great experience. Prior to using them, I had spent quite some time interviewing other freelancers and wasn't finding what I needed. After engaging with Toptal, they matched me up with the perfect developer in a matter of days. The developer I'm working with not only delivers quality code, but he also makes suggestions on things that I hadn't thought of. It's clear to me that Amaury knows what he is doing. Highly recommended!
George Cheng, CEO
As a Toptal qualified front-end developer, I also run my own consulting practice. When clients come to me for help filling key roles on their team, Toptal is the only place I feel comfortable recommending. Toptal's entire candidate pool is the best of the best. Toptal is the best value for money I've found in nearly half a decade of professional online work.
Ethan Brooks, CTO
Langlotz Patent & Trademark Works, Inc.
In Higgle's early days, we needed the best-in-class developers, at affordable rates, in a timely fashion. Toptal delivered!
Lara Aldag, CEO
Toptal makes finding a candidate extremely easy and gives you peace-of-mind that they have the skills to deliver. I would definitely recommend their services to anyone looking for highly-skilled developers.
Michael Gluckman, Data Manager
Toptal’s ability to rapidly match our project with the best developers was just superb. The developers have become part of our team, and I’m amazed at the level of professional commitment each of them has demonstrated. For those looking to work remotely with the best engineers, look no further than Toptal.
Laurent Alis, Founder
Toptal makes finding qualified engineers a breeze. We needed an experienced ASP.NET MVC architect to guide the development of our start-up app, and Toptal had three great candidates for us in less than a week. After making our selection, the engineer was online immediately and hit the ground running. It was so much faster and easier than having to discover and vet candidates ourselves.
Jeff Kelly, Co-Founder
We needed some short-term work in Scala, and Toptal found us a great developer within 24 hours. This simply would not have been possible via any other platform.
Franco Arda, Co-Founder
Toptal offers a no-compromise solution to businesses undergoing rapid development and scale. Every engineer we've contracted through Toptal has quickly integrated into our team and held their work to the highest standard of quality while maintaining blazing development speed.
Greg Kimball, Co-Founder
How to Hire C# Developers through Toptal
Talk to One of Our Industry Experts
A Toptal director of engineering will work with you to understand your goals, technical needs, and team dynamics.
Work With Hand-Selected Talent
Within days, we'll introduce you to the right C# developer for your project. Average time to match is under 24 hours.
The Right Fit, Guaranteed
Work with your new C# developer for a trial period (pay only if satisfied), ensuring they're the right fit before starting the engagement.
Find Experts With Related Skills
Access a vast pool of skilled developers in our talent network and hire the top 3% within just 48 hours.
At Toptal, we thoroughly screen our C# developers to ensure we only match you with talent of the highest caliber. Of the more than 200,000 people who apply to join the Toptal network each year, fewer than 3% make the cut. You’ll work with engineering experts (never generalized recruiters or HR reps) to understand your goals, technical needs, and team dynamics. The end result: expert vetted talent from our network, custom matched to fit your business needs.
Can I hire C# developers in less than 48 hours through Toptal?
Depending on availability and how fast you can progress, you could start working with a C# developer within 48 hours of signing up.
What is the no-risk trial period for Toptal C# developers?
We make sure that each engagement between you and your C# developer begins with a trial period of up to two weeks. This means that you have time to confirm the engagement will be successful. If you’re completely satisfied with the results, we’ll bill you for the time and continue the engagement for as long as you’d like. If you’re not completely satisfied, you won’t be billed. From there, we can either part ways, or we can provide you with another expert who may be a better fit and with whom we will begin a second, no-risk trial.
Vanclei is a software developer who specializes in C# and .NET, and has served clients such as ExxonMobil, The Weather Channel, and Sony’s Ci Media Cloud. At Work & Co, he developed apps for Gatorade’s US market. He co-authored Desenvolvendo com C#, a book that discusses C#’s role in delivering .NET solutions.
The popularity of C# is surging among companies and developers alike. It ranks as one of the top 10 skills used by midsize and larger companies according to Stack Overflow’s 2023 Developer Survey. As of August 2023, the TIOBE index ranked C# as the fifth most popular programming language and announced it as the programming language of the year for 2023. Widely adopted, use of C# shows no signs of plateauing.
Part of the high demand for C# may be credited to its seamless integration with Microsoft’s comprehensive suite of products. C# is the primary programming language for various applications within Microsoft’s .NET ecosystem, including the innovative .NET Maui (previously Xamarin.Forms), the .NET framework, and Azure—the cloud provider boasting 23% of the worldwide cloud infrastructure market share.
Beyond Microsoft’s domain, C# commands a central role in game development, serving as the main language for Unity, the leading game development platform. With the extensive adoption and real-world possibilities of C#, identifying and retaining top-notch C# developers is challenging.
This guide delves into the critical aspects of recruiting a C# developer, providing insights into identifying the candidates who are ideal for your specific needs, writing an effective job description that attracts qualified talent, and navigating the interview and assessment processes.
What attributes distinguish quality C# Developers from others?
A competent C# developer uses tools like Visual Studio and Visual Studio Code, is comfortable with NuGet package management, possesses a thorough understanding of .NET’s wealth of libraries, and is at ease with business analysis. A standout C# developer formulates .NET solutions and suggests meaningful options that are in line with a project’s technical requirements.
Complementary Technology Skills for a Quality C# Developer
A C# application interacts with a variety of libraries, databases, and systems. A C# developer who is proficient in all these technologies is rare, so prioritize skills that are most relevant to your specific project needs.
Database Management Systems – C# developers play a pivotal role in application development, primarily due to essential interactions with data. A seasoned C# professional is skilled in various facets of database management systems to accommodate project requirements, including:
Relational databases – A C# engineer leverages libraries such as Entity Framework to support relational databases like SQL Server, Oracle, or PostgreSQL. Particularly for Microsoft-based projects, SQL Server is the go-to solution.
NoSQL databases – A quality C# professional is conversant with modern, web-friendly, fast NoSQL databases like MongoDB or Firestore.
Database design – A C# expert’s knowledge of database design is essential given that architectural decisions impact an application’s performance.
ASP.NET – Many C# projects use ASP.NET to build robust, interactive web apps and services. If you are working on a web project, it’s a given that an expert C# engineer deeply understands the inner workings of ASP.NET and has experience using it with C# to build web solutions. You may also expect familiarity with Blazor or Razor.
Unity and Game Development – Given that C# is the base language of Unity, a standout C# developer should excel in scripting within the Unity engine to create exciting, interactive games. The developer should be skilled at architecting game logic, animating game elements, handling audio, and networking. They should be proficient at creating and manipulating Unity objects and handling user inputs. They should be comfortable using Unity’s physics engine to execute realistic movements and handle collision detections.
Application Integration With APIs – A microservice, analytical tool, or any other third-party service that communicates with an app likely provides an interface through a REST API. Therefore, a quality C# engineer will possess an advanced knowledge of API integration. They must be familiar with tools like cURL, Postman, or Swagger, which enable the testing and debugging of communication gateways for these APIs.
Collaboration and Versioning Tools – To support complex customized solutions, a C# developer should have proficiency with at least one version control tool like Bitbucket or GitHub. A version control system eases code maintenance, promotes clean code, and prevents the inadvertent modification of code written by other developers.
Specialized Support for Windows Desktop Applications – If your project entails supporting a niche Windows desktop application, it’s essential that your developer have professional experience with WinForms or WPF.
Hiring managers may wonder whether developers skilled in similar languages can jump in on a C# project. While experience with a coding language like C++ or Java may help an engineer learn C# more easily, that knowledge typically can’t replace the practical, industry-specific skills of a candidate with prior C# experience.
C# experts typically build enterprise software, web applications, and Windows desktop apps using the .NET framework’s Common Language Runtime (CLR), automating many lower-level programming tasks, including memory management. In contrast, C++ developers typically work on projects requiring high performance or fine control, interacting directly with machine resources to produce embedded systems, system software, and high-performance games.
How are C# developers different from Java developers?
C# and Java developers often take on similar projects, including building enterprise software and web applications, working on service-oriented architectures, and managing server-side programming. However, C# engineers develop Windows desktop apps, Unity games, and cross-platform mobile apps using .NET Maui, while Java developers traditionally target Android apps. When it comes to enterprise software development, choosing between C# developers and Java developers often depends on specific project requirements.
What certifications should a C# developer have?
Microsoft certifications offer tangible proof of a developer’s C# skills because they include comprehensive exams on C# development and architecture. The emphasis on certifications, however, has diminished greatly in recent years. What’s more, there are no active certifications specifically for C# developers.
Microsoft’s AZ-204 exam for Azure developers comes in two flavors, one of which is C#, making it a relevant choice for C# engineers. Previously, Microsoft vetted C# developers through any of the following certifications:
2002 to 2009 – Microsoft Certified Application Developer (MCAD)
2012 to 2021 – Microsoft Certified Solutions Associate (MCSA), Microsoft Certified Solution Developer (MCSD)
How can you identify the ideal C# Developer for you?
To identify the ideal C# developer, you must first identify the requirements of your project. An effective method is to craft a problem statement in which you delineate the goal(s) of the project or the problem(s) you are trying to solve:
Team requirements – Determine whether your engineering team is just short of an extra set of hands to deliver more code or if you require a dedicated developer to fulfill a specific core skill. Also consider whether this new hire will be a team or a sole developer.
Type of project – Assess your system, as distinct implementations call for specialized skills, tools, and expertise. Different projects—whether they are complex enterprise solutions, APIs or web applications, or database systems—may each call for distinctly specialized developers.
Legacy system work – Look for a C# developer who is familiar with older .NET versions and other in-use legacy applications if your project involves the migration or maintenance of a legacy system.
Also consider the C# development expertise level to target:
A junior developer who is familiar with basic concepts like project structure, data types, and keywords, is a good choice for straightforward projects. They may require up to a month of onboarding and a go-to mentor to fully acclimate to their role.
A mid-level developer who has worked with the C# language for some time and has delivered code into production is able to efficiently translate business and company requirements into source code. They are familiar with collaboration and versioning tools, package management, and test writing, and comfortable building and deploying .NET solutions for consumption by other applications.
A senior engineer who has an excellent grasp of the .NET ecosystem can develop high-quality solutions that meet stringent timelines. Their development experience likely spans serverless apps, APIs, and ASP.NET, and they will have interacted with various databases and cloud providers. Beyond translating company requirements into code, they can advise on the optimal solutions to meet business goals. They contribute effectively to all phases of the software development life cycle, either by driving development directly or by supporting team members in code execution.
Common use cases of C# include the Microsoft ecosystem and Unity game engine. If you are hiring a C# developer to create an efficient, scalable Microsoft solution, look for one who is skilled in C# within the contexts of ASP.NET, cloud technologies, and API integrations. For Unity, target C# developers with game development skills like scripting with C# within Unity and using the physics engine to build dynamic, interactive games.
How to Write a C# Developer Job Description for Your Project
To attract candidates who are well suited to meet the unique challenges of your project, draft a clear and effective description of the role. Begin with an engaging job title. “Senior C# back-end remote developer for Azure,” for example, provides a snapshot of the expertise level, work location, and project type.
In the body of the job description, be sure to outline the objective(s) of the project. What are you seeking to accomplish? What problem will be solved with the project’s completion? Clearly articulate the goals and challenges the project aims to address.
Share project details. For instance, indicate whether the project is a legacy system with years of use and a user base or if it is a fresh project that requires development from the bottom up. State the scope and/or size of the project in terms of the number of users and/or the volume of data to be processed. List the skills required, including soft skills (like leadership and communication) and specific technologies (like the specific cloud provider, database, and front-end framework).
What are the most important C# Developer interview questions?
In C#, an abstract class serves as a blueprint for deriving other classes. Positioned at a higher level in the object hierarchy, it may include both implemented (nonabstract) and yet-to-be-implemented (abstract) methods. Significantly, an abstract class can’t be instantiated, so no object can be created from it directly. A candidate’s grasp of these principles serves to indicate that they understand not only the C# language but also object-oriented programming in general.
How does .NET’s garbage collector manage memory? What should a C# developer consider when dealing with garbage collection in Unity game development?
Inefficient memory handling can lead to performance issues, such as frame rate slowdowns. Garbage collection, a process managed by the .NET framework, periodically discards unused objects, freeing up memory. The .NET garbage collector uses a generations feature, categorizing each object into one of three generation assignments based on the object’s lifespan. Understanding garbage collection—especially as it relates to generations for object lifespan management—is key for efficient game development. A candidate’s grasp of this .NET feature, as it applies to the Unity framework, will reveal their understanding of the inner workings of .NET framework.
Describe managed and unmanaged code in the context of the .NET framework.
Within the context of the .NET framework, managed code refers to code that is written in a high-level .NET language like C#. This code is managed by the .NET CLR, which provides key services such as garbage collection and safe access to memory. Consequently, implementing managed code frees developers to focus on business logic, rather than navigating low-level programming tasks.
Conversely, unmanaged code refers to code that runs directly on the operating system, outside the purview of the .NET framework’s CLR. Such code typically involves direct method calls to non-.NET DLLs, C libraries, or other application processes, all of which require manual memory management. Unmanaged code can deliver a more performant application but may also present complex issues for the developer to address.
A candidate’s understanding of these concepts demonstrates their deep knowledge of the .NET framework. Awareness of these key differences enables a developer to better balance the trade-offs between ease of development and high performance.
Why do companies hire C# Developers?
C# engineers are at the forefront of building and managing cutting-edge applications across diverse sectors, such as financial, accounting, data-processing, ERP, and CRM. Notably, in the ever-expanding gaming industry, C# shines as the primary development language for Unity.
C# developers working at organizations that are heavily reliant on Microsoft products have propelled the language’s penetration into the market, citing C#’s seamless integration into Microsoft products, as well as its popularity with developers and broad support.
A C# expert who is also well versed in business analysis can translate a company’s business requirements into new code or offer valuable insights to stakeholders on optimal solutions to fulfill those requirements on an existing system. Given C#’s extensive adoption across many industries and the potential it offers for developing real-world solutions, C# developers will be an investment in a company’s success for a long time to come.
The technical content presented in this article was reviewed by Cassio Tavares.