Hire the top 3% of freelance
Happstack developers.

Toptal is a marketplace for top Happstack developers, engineers, programmers, coders, architects, and consultants. Top companies and start-ups choose Toptal Happstack freelancers for their mission critical software projects.
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Hire Happstack developers and engineers

Mauro Schilman, Argentina

Member since April 30, 2015
While in high school, Mauro competed in several international math Olympiads and has since continued his love for problem solving and abstract thinking. He completed a master's degree in computer science and mathematics, and has done two internships with Google as an undergraduate. Click to continue

Matthew Keas, United States

Member since July 13, 2013
Matthew is an enthusiastic world traveler and follower of scientific computing, compilers, web development, and computer security. He has learned from universities and government organizations and worked for individual clients, startups, and more. He lives to solve problems, and he contributes actively to open source and community projects. Click to continue

Adis Hamzić, Bosnia and Herzegovina

Member since June 3, 2015
Adis is a software developer with proven skills ranging from embedded programming to web front-end development. Mostly focused on .NET and Java ecosystems and object-oriented programming due to familiarity and comfort, he still has no problems choosing other technologies and and learning new ones. Click to continue

Michele Finelli, Italy

Member since July 18, 2014
Michele is an entrepreneur and consultant. He has worked on designing, implementing, and maintaining the complex infrastructures of hundreds of servers, distributed all over the world. He has extensive experience in managing projects, in designing and providing solutions involving Linux/Unix, and in working with free software. Click to continue

Federico Tomassetti, France

Member since June 12, 2015
Federico has worked for TripAdvisor and Groupon. He has a PhD in software engineering working on model-driven development, domain-specific languages, and polyglot software development. If you take a look at his GitHub profile, you'll see that he has created and contributed to dozens of projects using Java, Ruby, Python, Clojure, Scala, Haskell, and other languages. Click to continue

Nemanja Stojanovic, Serbia

Member since May 2, 2014
Nemanja is a software developer with an inclination towards computer science and innovation. He has years of experience working with different programming languages and frameworks, giving him the ability to quickly adapt to any working environment or task. Click to continue

Tute Costa, United States

Member since November 21, 2013
Tute is an enthusiastic and senior Ruby on Rails developer. In addition to giving popular technical workshops at conferences, he is also an important creator and maintainer of open source Rails contributions. Click to continue

Raul Piaggio, Uruguay

Member since December 9, 2014
Raul specializes in Java and Scala development, seeking elegance in software architecture and code and striving for the proper abstractions to obtain maximum productivity and maintainability. He has been coding since he was nine, professionally since he was eighteen. Learning new things is what motivates him the most, and in the past few years, he has begun to specialize in front-end web technologies as well. Click to continue

Tanmay Dutta, Singapore

Member since September 25, 2014
Tanmay is a quantitative developer with great passion for technology and math. He uses a mix of languages for solving complex problems in quantitative finance, and in his free time, he likes to learn new things related to other branches of science. Click to continue
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Toptal in the press
“Despite accelerating demand for coders, Toptal prides itself on almost Ivy League-level vetting.”
Selina Wang
“Toptal allows corporations to quickly assemble teams that have the right skills for specific projects.”
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Testimonials
“One of our biggest and most time consuming problems is finding qualified staff. We need to find the correct platform to advertise on, create a proper ad, filter through tons of useless applications to try and find the small gems, interview and test the capabilities of applicants to see if they fit our profile and finally take a risk by hiring. This was the old way of doing things! The new way: describe the job position to our Toptal account manager, interview a few qualified applicants, hire with a risk-free trial! Much faster, a lot easier and with incredible end results.”
Catalin S. Balaci
Owner @ EvoBits Information Technology SRL
“We were extremely impressed with both Toptal and our developer, Bojan. They were extremely professional and flexible with our schedule. On multiple occasions, we needed to alter our timeline and they never hesitated to accommodate us. Bojan was communicative and delivered what we asked for on time and exactly to spec. I know that should we need additional work, will surely be looking to hire Bojan and Toptal again. ”
Stephen Vasallo
Co-founder @ Bubble
“Toptal is amazing! Sourcing and interviewing candidates has always been incredibly cumbersome and difficult - and usually takes weeks or months to find the right people. With Toptal, we had 5 candidates in 2 days that were all perfect for the job. They made the scheduling of interviews easy and straightforward and we were working with a top-level bad-ass developer within 2 weeks. I love you, Toptal.”
Ian Fosbery
CTO @ NMRKT
“Chris Wood is an absolutely exceptional Python developer, and the single most efficient programmer I've ever worked with. From the beginning of the project, Chris was instantly a vital member of the team. He's proactive, self-managed, knowledgeable, and efficient. I point him in a direction, and he delivers. Chris will be a part of the Crisis Cleanup team as long as I have anything to say about it.”
Aaron Titus
Project Manager @ Crisis Cleanup
“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 @ Kognosi
“One of their engineers from Colombia has joined our team as a full-time developer for more than 6 months, sometimes flying to work on-site in New York City with us. He is one of the best developers I've ever worked with.”
Carter Cleveland
CEO @ Artsy
“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. Amaury, the developer I'm working with, had all of the right skills and experiences that I needed for my project. He 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 and I'm happy to have him on the team. Highly recommended!”
George Cheng
CEO @ Bulavard, Inc.
“I struggled for weeks with a Youtube API-specific problem and couldn't find anyone to solve it. Toptal immediately identified the right consultant who took the time to investigate the issue and resolve it quickly. The process was seamless and I will continue to use Toptal with any other issues that arise.”
Rohit Gupta
CEO @ Bollyshake
“Our experience with Toptal was very good. We had an open ended development project when we got started and the programmer from Toptal was very helpful, working with us on everything from the top level outline all the way down to development and delivery of functioning code." ”
Michael Milton
VP of Engineering @ SLANTRANGE
“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
“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 @ Nifti
“My business relationship with Toptal has been nothing short of terrific. From reviewing my project with their team to choosing a highly-talented developer, and all the way through releasing our application, it has been an incredibly smooth and successful experience.”
Gary Craig
Senior Analyst @ NetApp
“I am more than pleased with the experience with Toptal. It may cost a little more, but because they pre-qualify and hand-pick the professional best suited for the job, it's well worth it. The professional I got to work with was on the phone (Skype) with me within a couple hours. I knew after discussing my project with him that he was the candidate I wanted to do the job, and I hired him immediately... and he wasted no time in getting to my project. He completed the job and went the extra mile to clean up older, messy code and even added some great design elements that enhanced our overall look. I would highly recommend Toptal to anyone needing to hire a professional. Great company. Great service. Thank you, Toptal.”
Paul Fenley
Director @ K Dunn & Associates
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My team is going to personally help you find the best candidate to join your team.

Alvaro Oliveira
VP of Talent Operations