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Hire the best system security developers near St. Louis.

Toptal is a marketplace for top remote system security developers. Top companies and start-ups in St. Louis choose Toptal System security freelancers for their mission critical software projects.
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Hire remote system security developers near St. Louis 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

Youssef Sherif

Member since September 11, 2017
Youssef is a prolific software architect/developer who thrives in dynamic, fast-paced working environments. He delivers world-class quality code in terms of architecture, readability, maintainability, and performance. He also has a hunger for learning about new advances in the software industry. 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

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

Darley Stephen

Member since May 2, 2016
Darley is a developer and architect with more than 18 years of experience in information technology including Java, PHP, C#, Oracle, Salesforce, and more. With his experience in varied technologies and industries, he can assure that his quality of work will be the best. 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
system security developers
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Testimonials
“Chris 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
“Working with Enrique has been a pleasure and a relief. His knowledge in the IT space is broad and in-depth. Zoomedia has been in need of this level of support for some time and I feel confident we are an exponentially stronger team with Enrique on board.”
Justin Bane
Senior Technical Lead @ Zoomedia
“Robert was such a breath of fresh air. He was an excellent communicator and knew exactly what I was looking for. Now, I have a website that works better than I thought it could for less than the cost -- and in half the time -- it would have taken other developers. Robert is as good as they come, a true professional -- anyone thinking of working with him, hire him. You won’t regret it.”
Matthew Bennett
CEO @ Winning Social LLC
“Getting set up with Toptal and finding a new team member was so easy, I don't know why anyone wouldn't give it a try. Best of all, we no longer have to worry about finding great people to help with our projects!”
Mike Branch
President & CTO @ Harbor System Integrators, Inc
“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
“Ignacio is one of the most diligent software developers that we have ever worked with—we feel like he's part of the family. He has always been flexible enough to work on our team's schedule and never misses deadlines. Toptal gets you the talent you need, on your timeline, keeping the process very low friction.”
Austin Evarts
CEO @ GoChime
“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've been very pleased with our experience working with Toptal. Their team was incredibly helpful in finding us the perfect developer for our project. The work was stellar, the communication was excellent, and we couldn't have been happier with the overall experience. We're excited to work with Toptal for more projects in the future. ”
Ryan Walker
Director, Product Management @ Rand McNally
“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
“With Toptal, we are able to find talented developers in a matter of weeks instead of months. The quality of talent they supply is extremely high as the developers are able to immediately onboard and ramp incredibly fast.”
Zac Carman
CEO @ ConsumerAffairs
“We needed a expert engineer who could start on our project immediately. Simanas exceeded our expectations with his work. Not having to interview and chase down an expert developer was an excellent time-saver and made everyone feel more comfortable with our choice to switch platforms to utilize a more robust language. Toptal made the process easy and convenient. Toptal is now the first place we look for expert-level help.”
Derek Minor
Senior VP of Web Development @ Networld Media Group
“As a Toptal qualified front-end developer, I also run my own consulting practice. When clients come to me for help filling key roles on their team, Toptal is the only place I feel comfortable recommending. Toptal's entire candidate pool is the best of the best. Toptal is the best value for money I've found in nearly half a decade of professional online work.”
Ethan Brooks
CTO @ Langlotz Patent & Trademark Works, Inc.
“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