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Hire the best system security developers near Chicago.

Toptal is a marketplace for top remote system security developers. Top companies and start-ups in Chicago choose Toptal System security freelancers for their mission-critical initiatives.
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Hire remote system security developers near Chicago or in a similar time zone

Matthew Best

Member since April 5, 2016
Matt is a passionate, talented software developer with over five years of experience developing complex applications in the fields of cyber security, automated tools, web applications, and back-end support systems. He is an expert in Windows applications, but is also proficient in creating cross-platform and web applications. He is an avid learner, a great communicator, and an excellent addition to teams of all sizes. Click to continue

Adam Scislowicz

Member since July 21, 2017
Adam is a Software Architect with seventeen years of industry experience. His focus has been on theoretical principles and practical methods that surround embedded platforms and distributed systems. He also has extensive experience with networking protocols. Adam has consistently made top-of-the-line products that position him as an invaluable member of any team. Click to continue

Stefan Progovac

Member since January 31, 2015
Stefan is a highly skilled iOS developer with a master's degree in physics. He loves both technological and artistic sides of software engineering. He has had the pleasure to work on some popular enterprise-level apps used by millions of people for companies like Target, Best Buy, and Coca-Cola. He believes that app development is truly an art. Click to continue

Luke Sapan

Member since July 7, 2015
Luke is an efficient and passionate Software Engineer with more than 14 years of programming experience. He has excelled in leadership positions but is also great with solo projects. Luke loves full-stack web development and his recent projects exemplify this in the field of administration. Luke is currently working in a senior engineering and systems administration position. Click to continue

Michael Carrillo

Member since January 21, 2017
At his core, Michael is a software and security engineer, but he is also a proficient developer with knowledge of many areas including web development, computer science, security, TCP/IP and network programming, mobile development, Unix/Linux administration, machine learning, mathematics, and physics. Michael has experience working remotely and he joined Toptal for the opportunity to work on more quality projects. Click to continue

Nitin Punjabi

Member since July 9, 2016
Nitin has nine years of programming experience in a variety of systems, mostly in the finance domain. He specializes in blockchain applications and architecture and is a certified Ethereum developer, though he has been exposed to multiple protocols. Click to continue

Jon Fenner

Member since December 6, 2017
Jon has over 20 years of experience in web application design, development, and infrastructure using a variety of platforms, including Java, ReactJS, NodeJS, and MySQL. He communicates extremely well, and works well both individually and as a team player or leader. Click to continue

Dave Poirier

Member since August 15, 2017
Since 2010, Dave has been working full-time as an iOS developer in Objective-C and Swift. He also has 20 years of experience in software development specializing in Assembly (Intel) and C. Throughout the years, he's had the opportunity to work on many software development projects in a myriad of software languages. Click to continue

Jonathan Bethune

Member since February 13, 2018
Jonathan is an experienced DevOps engineer based in Tokyo and New York. He's worked for a number of startups building the infrastructure and improving security. He has a very strong knowledge of machine learning, data analysis, infrastructure development, and data layer optimization. One of his best qualities is his knack for quickly learning new things which is why he landed in DevOps because it is the best field for trying new technologies. Click to continue

Edgar Lee

Member since October 14, 2015
Edgar has over three years of experience developing full-stack web applications with Ruby on Rails APIs and Ember.js as a front-end client. He has worked on teams of all sizes, both on-site and remotely, and has excellent communication and presentation skills. Click to continue
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“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 developer within 2 weeks. I love you, Toptal.”
Ian Fosbery
CTO @ NMRKT
“As a growing startup, finding top-notch engineering talent at affordable rates is one of the biggest challenges. After being frustrated with unreliable local contractors in New York, we turned to Toptal. We worked closely with Michal in Poland for 5 months and were thrilled with the results. Michal was an outstanding engineer who communicated flawlessly and took control of our project in ways that far exceeded my expectations. I give Michal and Toptal my highest endorsement and will continue to use and recommend them to anyone looking for software engineering talent.”
David Baker
Founder @ Spins.FM
“To take advantage of Toptal's capabilities, we actually remodeled the way we do our work. We develop pseudo code with some code fragments that we send to our Toptal developer, who has 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
“I can't say enough about how happy and confident I am in working with Enrique. He brings an enthusiasm to his profession that is very refreshing, constantly surprising us with his depth of knowledge and his capability to not only complete the task, but to surpass our expectations. He presents us with solutions that we would not have thought about ourselves, and sees the problem better than we can explain it.”
Chad Berryman
Senior Technical Lead @ Zoomedia
“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
“Toptal has been an incredible source of amazing software engineering talent. The contractors who have worked with us have been top notch, spoke perfect English, and worked superbly with our team. We recommend Toptal without any reservations!”
Vineet Singal
Co-Founder @ CareMessage
“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
“I'm incredibly impressed with the caliber of the Toptal developers I have worked with - they have proven themselves to be both dedicated and highly talented. We will most definitely continue to work with Toptal. ”
Savannah de Savary
Founder @ Industry Hub
“Toptal provides a great service: Within a week of posting my job, I was matched with my developer and ended up completing the entire project with him. I'll continue to use Toptal in the future for any new development work I may need.”
Mike Jones
CEO @ DigitalDripped
“I couldn’t have been more pleased with Toptal. They are professional, quick, well priced, and fun. I will be using them again for my next project, and the next, and the next, and the next ... ”
Mac Smith
President @ New Texas Investments
“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
“We recently launched our app with the help of Toptal and Nikola, an iOS developer. I was immediately impressed with the constant communication, detail, and level of talent that Nikola brought to the table. More importantly, when the project was underway, Nikola proactively provided creative workarounds for unforeseen hurdles and challenges. I couldn't be happier with our engagement and would highly recommend Nikola and Toptal.”
Chip O'Toole
Founder @ Humans Helping Robots LLC
“With the pressure on and millions watching the Cleveland Cavaliers during the NBA Playoffs, Toptal delivered the talent and expertise needed to launch a brand new fan engagement platform.”
Conor Kenney
Director of Professional Services @ Cleveland Cavaliers