System Security

Hire the Top 3% of Freelance System Security Developers

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

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Clients Rate Toptal System Security Developers4.5 / 5.0on average across 79 reviews as of Jul 2, 2020

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Hire Freelance System Security Developers

View Clifford

Clifford Paulick

Freelance System Security Developer

United StatesToptal Member Since August 9, 2018

Clifford enjoys solving business problems with technology, particularly with WordPress and/or cloud-based products. Years of experience enable him to discern which existing products may be the right fit or to develop a custom solution for your specific needs. Clifford communicates thoroughly and is a stickler for proper grammar, commitment to coding best practices, and caring about the user experience (UX).

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System SecurityjQuery UIWordPressZoho CRM
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Rogelio Nicolas Mengual

Freelance System Security Developer

ArgentinaToptal Member Since November 19, 2012

Rogelio is a versatile, positive, and self-motivated full-stack engineer with over twelve years of work experience in many programming languages, frameworks, and platforms. He enjoys taking on new challenges and constantly strives to learn new skills.

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System SecurityPHPCodeIgniterjQueryLinuxMySQLSystem AdministrationLAMPRelational DatabasesApache2LaravelFull-stackTwilio
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Ivan Sedlak

Freelance System Security Developer

SerbiaToptal Member Since September 6, 2015

Ivan has over 11 years of professional hands-on experience using a wide range of Microsoft technologies, mainly on enterprise web applications, security, internet, and intranet. His previous position was in a private company working as a senior .NET full-stack developer, software architect, and team leader. He has worked primarily on large-scale projects. Ivan has been working with Toptal clients since 2015.

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System SecurityASP.NETASP.NET Web APISQL Server Management StudioAgile Software DevelopmentAjax.NETMicrosoft SQL ServerC#ASP.NET MVCLINQASP.NET IdentityT-SQL
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Yuriy Polonskiy

Freelance System Security Developer

IsraelToptal Member Since December 24, 2018

Yuriy is the type of developer who believes that simplicity is the highest sophistication. Along with having several years of experience, he brings an eye for detail, a considerate and measured personality, and superb communication skills. His strongest skills are in DevOps—over four years of experience—but he’s also quite good with Python, AWS, cloud technologies, among others.

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System SecurityPythonDevOps
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Gergely Kalman

Freelance System Security Developer

SpainToptal Member Since July 5, 2012

Gergely is a versatile CTO with a wide variety of experience in a lot of different technologies. He is able to design systems from the ground up and carry them through their lifecycle. Having managed his own tech team, he does not shy away from managing others or advising business decisions.

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System SecurityPythonCDjangoLinuxDockerRaspberry PiBlockchainSystem AdministrationSaaSGitWeb Development
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Zoran Žunko

Freelance System Security Developer

CroatiaToptal Member Since November 2, 2013

Zoran is a veteran software engineer with over 10 years of professional experience. He has worked in various roles in different environments, ranging from R&D to business consultancy (BCM and PCI-DSS). He likes creating software and all of the related challenges. He is an amateur water polo player.

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System SecurityApexXMLSoapUIGitTest-driven Development (TDD)Agile Software DevelopmentSalesforceSalesforce.com Service Cloud CertificationCertified Salesforce AdministratorSalesforce.com Sales Cloud CertificationSalesforce.com Developer CertificationVisualforce Pages
View Karlo

Karlo Smid

Freelance System Security Developer

CroatiaToptal Member Since May 10, 2013

Karlo is a senior test engineer with skills in test automation, team leadership, and documentation. As a software tester, he likes to break stuff that others think works. As a team leader, he has proven abilities allowing him to build teams from scratch and streamline the QA process to perfection.

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System SecurityJavaTest-driven Development (TDD)JenkinsUI TestingZope
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Toptal in the press

... allows corporations to quickly assemble teams that have the right skills for specific projects.

Despite accelerating demand for coders, Toptal prides itself on almost Ivy League-level vetting.

Our clients
Building a cross-platform app to be used worldwide
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Building a cross-platform app to be used worldwide
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Creating an app for the game
Conor Kenney
Creating an app for the game
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Leading a digital transformation
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Leading a digital transformation
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Testimonials

Tripcents wouldn't exist without Toptal. Toptal Projects enabled us to rapidly develop our foundation with a product manager, lead developer, and senior designer. In just over 60 days we went from concept to Alpha. The speed, knowledge, expertise, and flexibility is second to none. The Toptal team were as part of tripcents as any in-house team member of tripcents. They contributed and took ownership of the development just like everyone else. We will continue to use Toptal. As a start up, they are our secret weapon.

Brantley Pace, CEO & Co-Founder

Tripcents

In addition to sharp technical skills, Faruk had a great attitude and is a really exceptional communicator. He always let us know where he was with his work, thoroughly and reliably. That's not always the case, and it made working remotely considerably easier. He was an easy integration into the team.

Leif Abraham, Co-Founder

AND CO Ventures Inc

I am more than pleased with our experience with Toptal. The professional I got to work with was on the phone with me within a couple of hours. I knew after discussing my project with him that he was the candidate I wanted. I hired him immediately and he wasted no time in getting to my project, even going the extra mile by adding some great design elements that enhanced our overall look.

Paul Fenley, Director

K Dunn & Associates

The developers I was paired with were incredible -- smart, driven, and responsive. It used to be hard to find quality engineers and consultants. Now it isn't.

Ryan Rockefeller, CEO

Radeeus

Toptal understood our project needs immediately. We were matched with an exceptional freelancer from Argentina who, from Day 1, immersed himself in our industry, blended seamlessly with our team, understood our vision, and produced top-notch results. Toptal makes connecting with superior developers and programmers very easy.

Jason Kulik, Co-Founder

ProHatch

As a small company with limited resources we can't afford to make expensive mistakes. Toptal provided us with an experienced programmer who was able to hit the ground running and begin contributing immediately. It has been a great experience and one we'd repeat again in a heartbeat.

Stuart Pocknee , Principal

Site Specific Software Solutions

We used Toptal to hire a developer with extensive Amazon Web Services experience. We interviewed four candidates, one of which turned out to be a great fit for our requirements. The process was quick and effective.

Abner Guzmán Rivera, CTO and Chief Scientist

Photo Kharma

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

Working with Marcin is a joy. He is competent, professional, flexible, and extremely quick to understand what is required and how to implement it.

André Fischer, CTO

POSTIFY

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

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

We had a great experience with Toptal. They paired us with the perfect developer for our application and made the process very easy. It was also easy to extend beyond the initial time frame, and we were able to keep the same contractor throughout our project. We definitely recommend Toptal for finding high quality talent quickly and seamlessly.

Ryan Morrissey, CTO

Applied Business Technologies, LLC

I'm incredibly impressed with Toptal. Our developer communicates with me every day, and is a very powerful coder. He's a true professional and his work is just excellent. 5 stars for Toptal.

Pietro Casoar, CEO

Ronin Play Pty Ltd

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. The developer I'm working with 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. Highly recommended!

George Cheng, CEO

Bulavard, Inc.

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.

In Higgle's early days, we needed the best-in-class developers, at affordable rates, in a timely fashion. Toptal delivered!

Lara Aldag, CEO

Higgle

Toptal makes finding a candidate extremely easy and gives you peace-of-mind that they have the skills to deliver. I would definitely recommend their services to anyone looking for highly-skilled developers.

Michael Gluckman, Data Manager

Mxit

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 at the level of professional commitment each of them has demonstrated. For those looking to work remotely with the best engineers, look no further than Toptal.

Laurent Alis, Founder

Livepress

Toptal makes finding qualified engineers a breeze. We needed an experienced ASP.NET MVC architect to guide the development of our start-up app, and Toptal had three great candidates for us in less than a week. After making our selection, the engineer was online immediately and hit the ground running. It was so much faster and easier than having to discover and vet candidates ourselves.

Jeff Kelly, Co-Founder

Concerted Solutions

We needed some short-term work in Scala, and Toptal found us a great developer within 24 hours. This simply would not have been possible via any other platform.

Franco Arda, Co-Founder

WhatAdsWork.com

How to Hire System Security Developers through Toptal

1

Talk to One of Our Industry Experts

A Toptal director of engineering will work you to understand your goals, technical needs, and team dynamics.
2

Work With Hand-Selected Talent

Within days, we'll introduce you to the right system security developer for your project. Average time to match is under 24 hours.
3

The Right Fit, Guaranteed

Work with your new system security developer for a trial period (pay only if satisfied), ensuring they're the right fit before starting the engagement.

FAQs

  • How are Toptal system security developers different?

    At Toptal, we thoroughly screen our system security developers to ensure we only match you with talent of the highest caliber. Of the more than 100,000 people who apply to join the Toptal network each year, fewer than 3% make the cut. You'll work with engineering experts (never generalized recruiters or HR reps) to understand your goals, technical needs, and team dynamics. The end result: expert vetted talent from our network, custom matched to fit your business needs. Start now.

  • Can I hire system security developers in less than 48 hours through Toptal?

    Depending on availability and how fast you can progress, you could start working with a system security developer within 48 hours of signing up. Start now.

  • What is the no-risk trial period for Toptal system security developers?

    We make sure that each engagement between you and your system security developer begins with a trial period of up to two weeks. This means that you have time to confirm the engagement will be successful. If you're completely satisfied with the results, we'll bill you for the time and continue the engagement for as long as you'd like. If you're not completely satisfied, you won't be billed. From there, we can either part ways, or we can provide you with another expert who may be a better fit and with whom we will begin a second, no-risk trial. Start now.

Tap Into World-Class Talent

  • Trusted Experts Only

    Trusted Experts Only

    All of our talent are seasoned experts who ramp up quickly, readily contribute as core team members, and work with you to minimize onboarding time.

  • The Right Fit

    The Right Fit

    We have a knack for matching you with the right fit. Start working with your new hire on a no-risk trial period, paying only if satisfied.

  • Scale as Needed

    Scale as Needed

    Hire in under 2 weeks and scale your team up or down as needed, no strings attached.

  • Seamless Hiring

    Seamless Hiring

    We handle all aspects of billing, payments, and NDA’s. Let us take care of the overhead while you focus on building great products.

  • Flexible Engagements

    Flexible Engagements

    Choose the engagement type that suits your needs — hourly, part-time, or full-time — with the ability to change anytime.

  • Expert Talent Matching

    Expert Talent Matching

    Focus on your project and enjoy support from your dedicated account executive and expert talent matcher.

Featured Toptal System Security Publications

Brian Wojtczak
EngineeringBack-end

Keep It Encrypted, Keep It Safe: Working with ESNI, DoH, and DoT

by Brian Wojtczak
Brian Wojtczak
EngineeringBack-end

Performance and Efficiency: Working with HTTP/3

by Brian Wojtczak
Hrvoje Gazibara
EngineeringBack-end

Changelog: The OWASP Top 10 Project

by Hrvoje Gazibara
View More System Security Articles

Top System Security Developers are in High Demand.

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