Hire the Top 3% of Freelance Computer Scientists

Toptal is a marketplace for dedicated Computer Scientists. Top companies and startups choose Toptal Computer Science freelancers for their mission-critical Computer Science development projects.

No-Risk Trial, Pay Only If Satisfied.

Hire Freelance Computer Scientists

Tamás Orosz

Freelance Computer Scientist
HungaryToptal Member Since December 1, 2020

Tamás is a senior C++ developer with decades of experience with various projects. He created world-class CAD systems on Windows, railway control systems on Unix, and many more. His programs run at the Italian Railways, log home companies in the US, and many architects' computers, including builders of Burj Khalifa tower and many civil engineers in Luxemburg.

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Roman Vlasov

Freelance Computer Scientist
GermanyToptal Member Since December 8, 2020

Roman worked at Meta, has 15 years of experience in 3D and VR software development, and a Ph.D. in computer science. He has led and worked on projects of all sizes, from scoping requirements to launch, primarily focusing on VR/AR, games, 3D interactive applications, CAD, and computer vision. With expertise in various languages and platforms, like C++, Java, and C#, Roman has designed and developed cutting-edge products, including VR arcade games, facial recognition, and advanced medical imaging.

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Jesper Kristensen

Freelance Computer Scientist
United StatesToptal Member Since September 19, 2022

Jesper loves solving problems and helping develop next-generation engineering systems. He is motivated by a deep drive to create excellent solutions and aims to be challenged while moving companies forward. Jesper enjoys working on a budget and delivering on strict time restrictions—it's challenging and exciting.

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Conor Sweeney

Freelance Computer Scientist
United StatesToptal Member Since May 31, 2021

Conor is an experienced iOS software engineer and doctoral candidate in computer science, focusing on the intersection of machine learning and software systems. Notable clients include NBC, Google, Amazon, CNBC, Bravo, and E!. He developed an app where users can schedule food pick-ups to local homeless shelters and soup kitchens, track the status of volunteers, and send real-time updates. What separates Conor from the average software engineer is his creative solutions to complex problems.

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Brendan Ritter

Freelance Computer Scientist
United StatesToptal Member Since November 11, 2021

Brendan has spent the last five years working as a full-stack engineer at Raytheon BBN, developing pathfinding and scheduling applications for several clients, including the US Air Force and Pentagon. With a bachelor's degree in computer science at Olin College of Engineering and a master's degree in computer science at Cornell University, Brendan is interested in freelancing because he is willing to learn and work in many different domains while contributing to challenging technical projects.

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Shanshan Wang

Freelance Computer Scientist
United StatesToptal Member Since June 3, 2022

Shanshan is a data scientist and machine learning engineer with versatile technical skills and a proven track record of effective project and team leadership. Her expertise includes machine learning, process simulation, optimization, end-to-end development, and deployment on cloud infrastructure like AWS.

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Florian Bolgar

Freelance Computer Scientist
FranceToptal Member Since April 1, 2020

Since he was 11 years old, Florian has been programming, and this has become second nature for him. In particular, during his studies in mathematics, physics, and computer science at the prestigious Grande École in France (E.N.S. Ulm), and the four subsequent years as a teacher and a developer, he learned to master parallelization and low-level programming in C, Fortran, and Python. Florian is very versatile, quick to learn, and a very efficient programmer.

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Nimrod Talmon

Freelance Computer Scientist
IsraelToptal Member Since June 28, 2021

Nimrod is a researcher, consultant, and developer with 12 years of experience and expertise in software architecture and development, mathematical modeling, and algorithm development, in fields such as mathematical optimization, AI, algorithmic game theory, and operations research. Early in his career, Nimrod was a software engineer and tech team lead at Google, and he holds a PhD in computer science. From a polymath perspective, his EBS numbers are Erdös 3, Sabbath 7, and, arguably, Bacon 6.

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Stefan Fischer

Freelance Computer Scientist
South KoreaToptal Member Since September 1, 2021

Stefan is an experienced C# and .NET developer and software architect, mainly focusing on back-end application services, yet having a broad range of professionally proven skills at hand to deliver end-to-end assistance on complex and challenging projects. He's also mastered various out-of-band skills in several fields of knowledge such as electronic design, 2D and 3D CAD construction, 3D printing, and manufacturing methods that help him quickly get to the idea of customer's specific needs.

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Jakob Vukalovic

Freelance Computer Scientist
CroatiaToptal Member Since January 26, 2021

Jakob is a software engineer with a master’s degree in computing from the University of Zagreb, specializing in computer engineering. He has significant experience in cross-platform software development, primarily utilizing Python and C/C++ in his projects.

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Thomas Wuillemin

Freelance Computer Scientist
CyprusToptal Member Since October 2, 2021

Thomas is a seasoned senior back-end developer and architect. In the past twenty years, he had the opportunity to work in various environments. His experience allows him to offer the most suitable solution matching business requirements, robustness expectations, and stakeholders' timelines. Coming from the Java world, Thomas nonetheless favors a pragmatic approach regarding technical decisions.

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Toptal in the press

... allows corporations to quickly assemble teams that have the right skills for specific projects.

Despite accelerating demand for coders, Toptal prides itself on almost Ivy League-level vetting.

Our clients
Creating an app for the game
Conor Kenney
Creating an app for the game
Leading a digital transformation
Elmar Platzer
Leading a digital transformation
Building a cross-platform app to be used worldwide
Building a cross-platform app to be used worldwide
Drilling into real-time data creates an industry game changer
Drilling into real-time data creates an industry game changer
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


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


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


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


How to Hire Computer Scientists 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 Computer scientist for your project. Average time to match is under 24 hours.

The Right Fit, Guaranteed

Work with your new Computer scientist for a trial period (pay only if satisfied), ensuring they're the right fit before starting the engagement.


  • How are Toptal Computer scientists different?

    At Toptal, we thoroughly screen our Computer scientists 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 Computer scientists in less than 48 hours through Toptal?

    Depending on availability and how fast you can progress, you could start working with a Computer scientist within 48 hours of signing up.

  • What is the no-risk trial period for Toptal Computer scientists?

    We make sure that each engagement between you and your Computer scientist 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.

Tap Into World-Class Talent

  • Trusted Experts Only

    Trusted Experts Only

    All of our talent are seasoned experts who ramp up quickly, readily contribute as core team members, and work with you to minimize onboarding time.

  • The Right Fit

    The Right Fit

    We have a knack for matching you with the right fit. Start working with your new hire on a no-risk trial period, paying only if satisfied.

  • Scale as Needed

    Scale as Needed

    Hire talent within 48 hours and scale your team up or down as needed, no strings attached.

  • Seamless Hiring

    Seamless Hiring

    We handle all aspects of billing, payments, and NDA’s. Let us take care of the overhead while you focus on building great products.

  • Flexible Engagements

    Flexible Engagements

    Choose the engagement type that suits your needs — hourly, part-time, or full-time — with the ability to change anytime.

  • Expert Talent Matching

    Expert Talent Matching

    Focus on your project and enjoy support from your dedicated account executive and expert talent matcher.

Top Computer Scientists Are in High Demand.

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