Hire the Top 3% of Freelance POSIX Developers

Toptal is a marketplace for dedicated POSIX developers, engineers, programmers, coders, architects, and consultants. Top companies and startups choose Toptal POSIX freelancers for their mission-critical POSIX development projects.

No-Risk Trial, Pay Only If Satisfied.

Hire Freelance POSIX Developers and Engineers

Ayaz Huseynov

Freelance POSIX Developer
AzerbaijanToptal Member Since August 30, 2022

Ayaz is a senior systems developer with experience in various fields and platforms, ranging from the public sector to the automotive industry, from low-level HPC development to web and mobile app development. He has worked as a team lead, project architect, and productive team member. His engineering mindset and practical, step-by-step approach to clients distinguish his work.

Show More

Ted Byrd

Freelance POSIX Developer
United StatesToptal Member Since October 24, 2022

Ted is a seasoned software engineer with vast experience developing complex software systems for clients ranging in size from startups to Fortune 500 companies. His deep experience with the entire software development lifecycle includes requirements, design, implementation, testing, deployment, and maintenance. One of Ted's most significant accomplishments is bringing the power of technology to people who aren't accustomed to using it.

Show More

Jens Stimpfle

Freelance POSIX Developer
GermanyToptal Member Since September 3, 2017

Jens writes programs that are maintainable and at the same time effortlessly performant. He has experience writing GUI and 3D applications, multithreaded and networked systems, as well as compilers. He prefers working with C, although he has a solid proficiency in many programming languages such as C++ and Python. Jens has a solid Unix and Linux background and is currently at home both on the Win32 and Linux platforms.

Show More

Predrag Miocinovic

Freelance POSIX Developer
United StatesToptal Member Since October 3, 2022

Predrag is a software architect and engineer specializing in C++ for 20+ years. He started his career as an astrophysicist, working on groundbreaking experiments with optical and radio detectors; signal processing; and data management, analysis, and simulations. Leveraging those skills, Predrag transitioned to the financial sector as a lead developer for KRM, the market's most advanced financial risk analysis engine, used by some of the largest financial institutions to manage risk exposures.

Show More

Flavio Alves

Freelance POSIX Developer
BrazilToptal Member Since December 27, 2019

Flavio is experienced in embedded software development with 15+ years in projects of electronic equipment for several industries including medical equipment, telecom, networking, retail, and transportation. With solid experience in Linux operating systems, C/C++, C#, and Python operating systems, he enjoys working on industrial and internet of things (IoT) solutions running in web systems, desktop, and embedded devices.

Show More

Darko Kulic

Freelance POSIX Developer
SerbiaToptal Member Since September 27, 2018

Darko is a software architect who has more than 12 years of professional experience. He is always looking to increase his knowledge and expertise with a willingness to dive into the unknown. Darko has most recently worked on applying modern distributed systems, cryptography, and blockchain theory to solving SSI-related problems.

Show More

Sheldon Linker

Freelance POSIX Developer
United StatesToptal Member Since July 6, 2020

Dr. Linker has been doing consulting and contract programming for decades. He has specialized in database work since 1978. His doctoral work involved AI and knowledge bases. He is also adept at programming servers, client systems, desktop systems, embedded systems, and a number of other types of systems. Sheldon has served in a database, programming, business analyst, and project management capacity. He currently teaches the latter two at the University of Maryland online.

Show More

Luka Kvavilashvili

Freelance POSIX Developer
GeorgiaToptal Member Since November 30, 2021

Luka is a senior full-stack engineer with eight years of professional experience dedicated to building beautiful, detail-oriented, and slick products. He's experienced with small, fast-paced startups and agile billion-dollar enterprises with engineering teams of 20 people. Luka is eager to use this diversified experience to tackle new and complex challenges.

Show More

Yordan Pavlov

Freelance POSIX Developer
BulgariaToptal Member Since October 17, 2018

Yordan has 10+ years of experience as a software developer, mainly as a C++ developer. He has worked on various projects in the telecom and travel industries and is currently interested in working on a cryptocurrency/blockchain project.

Show More

Eckart Schütz

Freelance POSIX Developer
CyprusToptal Member Since March 26, 2018

Eckart has 25 years of experience developing back-end software with C++ in the telecommunications and financial services industries. His expertise ranges from embedded systems to big data platforms and from libraries to software architecture.

Show More

Si Ke

Freelance POSIX Developer
CanadaToptal Member Since September 4, 2020

Si is a talented engineer with 20 years of software design and development experience and six years of effective team leadership expertise. He developed Diskeeper that sold more than 10 million copies. Si has successfully shipped several products running in Windows, Linux, and Macintosh. His strengths include designing and developing complex and high-performance enterprise software. Si is an innovative professional who enjoys solving good challenges.

Show More

Discover More POSIX Developers in the Toptal Network

Start Hiring
Trustpilot
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
Creating an app for the game
Conor Kenney
Creating an app for the game
Leading a digital transformation
Elmar Platzer
Leading a digital transformation
Building a cross-platform app to be used worldwide
Building a cross-platform app to be used worldwide
Drilling into real-time data creates an industry game changer
Drilling into real-time data creates an industry game changer
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 startup, they are our secret weapon.

Brantley Pace

CEO & Co-Founder

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

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

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

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

How to Hire POSIX Developers Through Toptal

1

Talk to One of Our Industry Experts

A Toptal director of engineering will work with 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 POSIX developer for your project. Average time to match is under 24 hours.
3

The Right Fit, Guaranteed

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

FAQs

  • How are Toptal POSIX developers different?

    At Toptal, we thoroughly screen our POSIX developers to ensure we only match you with talent of the highest caliber. Of the more than 200,000 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.

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

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

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

    We make sure that each engagement between you and your POSIX 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.

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 talent within 48 hours 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.

Top POSIX Developers Are in High Demand.

Start Hiring