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

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

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

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

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

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

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

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

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

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.”
Steven Norton
“Toptal has been extremely helpful to us in finding top remote talent. The ratio from interview to hire with Toptal candidates is the highest I've ever experienced in my professional career.”
Philipp Berner
Co-founder and CTO @ KeepSafe
“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
“We've used Toptal developers multiple times for multiple projects, and they've always been world-class—regardless of whether they've been from South Africa, Brazil, or the United States.”
Alex Haro
CEO @ Life360
“John has been so great to work with! He has met all our requirements, done a speedy job with excellence, and has completed everything we’ve asked him to. Working with him has been a great experience.”
Jenny Lord
Communications Project Manager @ Lake Pointe Church
“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
“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’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 of the level of professional commitments each one of them have demonstrated. For those looking to work remotely with the best engineers, look no further. Thank you, Toptal.”
laurent Alis
Founder @ Livepress
“I really enjoyed my experience with Toptal. Searching for a developer was both painless and engaging, and the first match was a perfect fit! Toptal is a fantastic way to find talented developers for small or large aspects of your project.”
Willem Shepherd
Creative Director @ Mookieyams
“Finding a good developer who specialised in the technologies we use seemed like an impossible task... until we used Toptal. We had several trial periods and have just accepted our first developer to join the team! The whole process went seamlessly and without any surprises or hidden costs. We are very happy and will continue to work together!”
Artem Tolmachev
CEO @ eKids.nl
“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
“Back in July '12, FundedByMe needed to quickly scale our development team to create the equity crowdfunding leg of our operation. Working with a small budget, we couldn't spend time on vetting candidates, so we turned to Toptal. They identified a stellar developer that truly set the bar when it came to delivering product.”
Arno Smit
CTO @ FundedByMe.com
“We really enjoy working with Toptal. The experience has been very positive, and we'd recommend it to anyone seeking developers on-demand.”
Jeff Kerr
CEO @ CaseFleet
“Sergio was an awesome developer to work with. Top notch, responsive, and got the work done efficiently.”
Dennis Baldwin
Chief Technologist and Co-Founder @ PriceBlink
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VP of Talent Operations