Hire the Top 3% of Freelance Open Source Developers

Toptal is a marketplace for top Open Source developers, engineers, programmers, coders, architects, and consultants. Top companies and startups can hire Toptal dedicated (full-time), hourly, or part-time Open Source freelancers for their mission-critical software projects.

No-Risk Trial, Pay Only If Satisfied.

Hire Freelance Open Source Developers and Engineers

Peter Goldstein

Freelance Open Source Developer
United StatesToptal Member Since March 11, 2022

Peter is a hands-on developer, architect, CTO, and technical founder passionate about using best practices to quickly build high-quality products. He has over 20 years of experience building full-stack applications. Peter specializes in Ruby on Rails and Go but is a software generalist who is comfortable working in many languages. He is a committed open-source enthusiast who leverages open source to reduce both the cost and time needed to build the products and features he creates.

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Steve Talbot

Freelance Open Source Developer
United KingdomToptal Member Since June 3, 2019

As a serial co-founder of tech startups, Steve has worked with a wide range of technologies and supported many engineers to do their best work—whether by troubleshooting a specific technical issue, improving the engineering process, or simply acting as an independent mentor.

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Maxim Gladkov

Freelance Open Source Developer
SpainToptal Member Since April 6, 2022

Maxim is a tech-savvy geek with rich experience in the business. He has vast experience as a senior software engineer and architect and a strong knowledge of JavaScript, Node.js, React, Ruby, Ruby on Rails, Neo4j, MySQL, and PostgreSQL. An Agile enthusiast, tech consultant, and startup founder, Maxim focuses on a range of core competencies, such as software development, software architecture, database design, tech consulting, and business automation. He will be a strong addition to any team.

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Nicol Vojacek

Freelance Open Source Developer
South AfricaToptal Member Since March 30, 2022

Nicol is a full-stack software developer with seven years of experience using technologies like React, Node.js, TypeScript, and Ruby on Rails. She is a jack of all trades with a keen interest in software development, entrepreneurship, and product design. Nicol takes pride in building solutions that solve real business problems with great attention to detail and quality.

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Samuel Lock

Freelance Open Source Developer
United KingdomToptal Member Since August 29, 2022

Samuel is an AWS-certified senior engineer specializing in serverless development and DevOps/platform engineering on AWS. He has experience delivering serverless REST APIs and data-ingestion pipelines, all powered by AWS Lambda. He has also worked in a DevOps role and considers himself an AWS CloudFormation, CI/CD, and automation expert. Samuel has a background in two early-stage startups, one of which handled medical data.

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Sylvain Vittecoq

Freelance Open Source Developer
SwedenToptal Member Since August 17, 2022

Sylvain's been a CTO, engineering manager, and senior software engineer in the US and Europe. He is a very hands-on, result-oriented expert in Java and solution definition and can work with anyone from engineers to C-level execs. Sylvain's delivered nationwide security infrastructures for millions of devices and connected millions of eCommerce users. Sylvain founded FileChain to offer next-generation blockchain platforms for large-scale Web 3.0, Industry 4.0, and NFT decentralized marketplaces.

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Milana Cap

Freelance Open Source Developer
SerbiaToptal Member Since January 9, 2017

Milana is a self-taught WordPress/PHP engineer. She started learning PHP in 2008, WordPress in 2009—and has been working as a freelance WordPress theme developer since 2010. She's been a full-stack engineer since 2011 and a full-time WordPress theme developer and project lead since March of 2015.

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Erik Arakelyan

Freelance Open Source Developer
DenmarkToptal Member Since April 8, 2022

Erik is an ML researcher currently pursuing a PhD in machine learning at the University of Copenhagen (UCPH), specializing in topics of NLP, Knowledge Graphs optimizations, and explainability in NLP. He is looking for opportunities to apply his deep learning and software engineering skills in an exciting and challenging project.

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Erdinc Mutlu

Freelance Open Source Developer
United KingdomToptal Member Since June 16, 2022

Erdinc is a software engineer with 24 years of experience and extensive software and systems development skills in multinational companies. He has solid knowledge of the back end, fintech, payment systems, cryptocurrencies, AWS, GCP, test automation, and digital communication systems. He is highly proficient in Go, Python, ANSI C, C++, test automation, embedded systems, device drivers, Linux, and real-time operating systems. Erdinc is proactive, highly organized, and self-motivated.

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Patricia Cobelli

Freelance Open Source Developer
UruguayToptal Member Since November 8, 2022

Patricia is a self-taught machine learning engineer with expert knowledge of computer vision. She can handle every step of a machine learning solution, from data engineering to model training and deployment on AWS. Patricia is finishing her master's studies and collaborating on her thesis with researchers at Brown University.

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Ivan Voras, PhD

Freelance Open Source Developer
CroatiaToptal Member Since August 26, 2014

Ivan has a Computer Engineering PhD. He has worked as a CTO and a system architect, founding multiple projects and businesses. He has experience architecting and implementing server-side solutions, including distributed platforms, such as blockchains, chat servers, and game back-ends. He helped establish the Toptal blockchain specialization, served as a tech screener, and lectured for Toptal Academy.

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THE TOPTAL ADVANTAGE

98% of Toptal clients choose to hire our talent after a risk-free trial.

Toptal's screening and matching process ensures exceptional talent are matched to your precise needs.

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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
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 Open Source 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 Open Source developer for your project. Average time to match is under 24 hours.
3

The Right Fit, Guaranteed

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

Find Experts With Related Skills

Access a vast pool of skilled developers in our talent network and hire the top 3% within just 48 hours.

FAQs

  • How are Toptal Open Source developers different?

    At Toptal, we thoroughly screen our Open Source 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 Open Source developers in less than 48 hours through Toptal?

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

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

    We make sure that each engagement between you and your Open Source 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.

Featured Toptal Open Source Publications

Top Open Source Developers Are in High Demand.

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