Hire the top 3% of freelance ColdSpring developers.

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

Youssef Shahin, Egypt

Member since November 1, 2013
Youssef is an engineer, developer, and problem solver with a proven ability to build optimal solutions for solving complex problems. He has experience with large scale architectures and machine learning solutions. He is a fast learner who is constantly looking to improve his skills. Click to continue

Danielle R Weisz, United States

Member since August 6, 2015
Danielle is a software developer and engineer with experience in both development and test roles. Her focus is on web and mobile development, but she is confident in her ability to tackle various, complex, and interrelated problems of all kinds, and she is constantly striving to learn new skills. 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

Michael Valasanyan, Armenia

Member since July 7, 2015
Michael loves designing complex solutions that require a creative and analytical approach combined with the adoption of new technologies and methodologies. He enjoys traveling and working in a culturally diverse and global environment, communicating with international teams and creating real value for customers. Click to continue

Seth Stone, United States

Member since July 13, 2014
Seth is a software architect, developer, and technical mentor who is currently designing and building an enterprise CRM application for a non-profit in East Texas. Previously, he has worked full-time as a programmer for Walmart. He is proficient in ColdFusion, jQuery, and MySQL. Click to continue

Andre Bar'yudin, United Kingdom

Member since January 20, 2015
Andre is a seasoned developer with close to 20 years of hands-on experience, including C++/C#/Java/Scala/Python/etc. and fintech/investment banking experience. He speaks English, Hebrew, Russian, and some Spanish, and is quite capable of working both on his own and in a multinational team. Click to continue

Joachim Kuebart, Germany

Member since April 17, 2015
Joachim has worked as a professional programmer for more than 20 years. His focus is on high-performance and high-reliability software development, specializing in heterogeneous systems integration. A mathematician by education, he enjoys working on complex problems in a demanding environment. Click to continue

Aidan Musnitzky, South Africa

Member since May 30, 2015
Aidan is a full-stack software engineer with a strong theoretical computer science and mathematics background. He has built mobile/web applications and web services at scale, worked on large-scale projects, and designed and developed various games and products. He has worked on large teams and led small teams, including leading a new internal product team at Amazon Web Services. Click to continue

Anton Tanchuck, Ukraine

Member since March 30, 2015
Anton has a passion for algorithms and coding challenges as well as a lot of experience in developing both managed and native code for Windows and Windows CE operation systems, including all levels from UI to kernel modules. This, combined with years of experience creating multi-platform applications (from OS X to Windows and even some RTOS) and excellent communication skills, makes him a great addition to any international team. Click to continue
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“Through Toptal, we were able to find and select a senior engineer who is both very professional and easy to work with. The quality of matching that Toptal enabled has been crucial to our success, it was at a fair price, and it came with a much appreciated, risk-reducing trial period.”
John Olsen
Director @ Bingo Solutions
“Toptal helped us when we had a hiring gap we needed to fill. The developer we received was excellent, with a great work ethic and fit in very well with the team. We are very happy with the service and would definitely consider using Toptal again in future should we need additional help. ”
David Gildeh
CEO @ Dataloop.io
“Andrea is doing an amazing job. I don't think we could have gotten a better person. He is fun to work with, he thinks out of the box, and he is extremely knowledgeable in what he is going. He not only does an excellent job, he also helps our company to differentiate our business model further (e.g. making our app offline-capable). I would recommend Andrea as well as Toptal any time to any friend.”
Pascal Girardat
Co-Founder / CEO @ Lifestage Solutions AG
“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
“We struggled for weeks to find a developer or architect with expertise in a niche API, but to no avail. When we linked up with Toptal, they connected us with the very expert we needed, and a week later we were hard at work making progress! The whole process was very smooth and we ended up with a new feature we couldn't have done without Toptal.”
Thomas Honeyman
COO @ FindMySong
“Nuno is brilliant! He has been extremely helpful and really knows his stuff with regard to Django in particular.”
John Yetter
Software Engineer @ Survox, Inc.
“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
“We've actually remodeled the way we do our work to take advantage of Toptal's capabilities. We develop pseudo code with some code fragments and send to our Toptal developer with a specific task set. The work is then further processed by the next group of Toptal engineers. It's been very efficient and we've seen a massive improvement in our development speed.”
William North
CTO & Co-Founder @ Swizly
“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 developers deliver. Hiring my first developer on Toptal was such a pleasant experience that I quickly turned around and hired another. Every developer I've hired on Toptal has been professional, skilled, and self-managing—a pleasant departure from the typical freelancer marketplace.”
Mike Riess
Owner @ RiessGroup
“We needed some short-term work in Scala, and Toptal found us a great developer within 24 hours. It was done quickly for a specific need, and it's been great. It simply would not have been possible via any other platform.”
Franco Arda
Co-Founder @ WhatAdsWork.com
“We have been incredibly happy with our Toptal experience. Initially a skeptic, the process to find and recruit a fabulous iOS developer was very easy. Rather than sifting through hundreds of CVs, we saw two and hired them. They have worked effectively, getting up to speed incredibly quickly and have almost become part of the team. We would definitely use Toptal again. ”
James O'Day
Co-Founder @ Pearlshare
“I've been very happy with Juraj. He is efficient, writes great code, and is an extremely nice guy to work with. Most importantly, he is self-motivated. In just his initial pass at the code base, he has contributed several optimizations and stability improvements. Regarding Toptal as a service…well, you matched us up with Juraj without me having to sort through a list of candidates, so I’m impressed.”
Matt Cotton
Dev Team Lead @ eFolder
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