Hire the Top 3% of Freelance RDF Developers

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

No-Risk Trial, Pay Only If Satisfied.

Hire Freelance RDF Developers and Engineers

César Montaña

Freelance RDF Developer
New ZealandToptal Member Since May 4, 2021

César believes good data allows organizations to be ahead of the competition by creating baselines, benchmarks, and goals based on evidence. He's an SQL Server certified .NET developer with 15 years of experience designing and building strategic data platforms that host huge amounts of data, solving problems, and supporting performance issues for companies from all over the world. You can trust César to maintain your data and translate it into a usable form via models, reports, and dashboards.

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Maciej Jarka

Freelance RDF Developer
PolandToptal Member Since June 18, 2020

Maciej is an ETL, BI, and big data engineer who's eager to share his knowledge and experience. He has over a decade of international experience under his belt, gained in projects spanning from data integration to analytics while working for industry leaders such as ING (banking) and Roche (pharma). Maciej is also quite handy with several tools including Snowflake, Netezza, Informatica, and DataStage (he’s a certified IBM DataStage trainer).

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Laura Tolosi

Freelance RDF Developer
BulgariaToptal Member Since February 4, 2019

Laura has a Ph.D. from the Max Planck Institute for Informatics, Germany, in the field of computational biology, focused on cancer biomarker detection using statistics and machine learning. She worked on projects in the field of natural language processing such as named entity recognition, sentiment analysis, fake news detection. Recently, she has worked on applying reinforcement learning methodology for trading financial instruments.

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Draltan Marin

Freelance RDF Developer
FranceToptal Member Since November 28, 2018

Draltan has been working in software development on a wide variety of technologies for more than 10 years. Over the past three years, I co-founded a startup and participated in a few startup projects as CTO. This year, I've been heavily working on blockchain projects defining technical architectures and developing contracts.

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Pablo de Castro

Freelance RDF Developer
SpainToptal Member Since November 7, 2019

Pablo has extensive experience designing and building state-of-the-art machine learning systems in the context of computer vision and NLP and constructing modern data science workflows for the analysis of large quantities of data. Along with being a seasoned data-centric Python and C++ developer, Pablo has a PhD degree, and he developed new machine learning methods and analysis pipelines to increase the discovery potential of scientific experiments at CERN.

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Minto van der Sluis MSc

Freelance RDF Developer
NetherlandsToptal Member Since April 13, 2020

Minto is a highly skilled software architect and developer who is deeply insightful and understands the big picture. He has created wearable sensor devices to help the elderly maintain their independence, architected applications for the Dutch government, and delivered solutions for the banking industry. His deliverables are flexible and future proof. Minto is a great person to work with; he is relaxed and friendly, yet honest and outspoken when he finds a better way to reach business goals.

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Wojtek Wajerowicz

Freelance RDF Developer
SwitzerlandToptal Member Since September 6, 2022

Wojtek is a back-end software engineer with a master's degree in telecommunications and computer science. He specializes in Scala development and has significant expertise in functional programming and building scalable web services. He has also worked with big data technologies like Spark and event sourcing/streaming architecture like Kafka. Wojtek has contributed to the back-end development of meaningful projects, including a diagnostic implementation simulator for SARS-CoV-2.

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Cameron Barr

Freelance RDF Developer
AustraliaToptal Member Since October 2, 2012

Cameron is an expert PHP application developer who has been leading web development projects for 15 years in both startup and mature business environments. He is an excellent communicator, having written instructional material for PHP frameworks and development documentation for projects. He also works a great deal with Xdebug, PHPUnit, JavaScript, AWS, and Bash. Cameron can join any project and help deliver on requirements quickly.

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Pawel Kaplanski

Freelance RDF Developer
AustraliaToptal Member Since April 3, 2019

Pawel is an experienced data-scientists and machine learning professional. He has worked for Fortune 100 companies, and he has an academic background in the field. Before moving to data science, he was a former lead architect in Samsung R&D Center. Pawel holds a Ph.D. in knowledge representation and reasoning as well as a master's degree and a bachelor of science degree in computer science.

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Justas Birgiolas PhD, MBA

Freelance RDF Developer
United StatesToptal Member Since March 31, 2020

Justas recently graduated from a computational neuroscience doctoral program where he applied computer vision and machine learning methods to build supercomputer models of the brain. Before that, he received an MBA from Carnegie Mellon University. In addition to graduate training, Justas is an experienced full-stack web developer. He works as a software engineer at a rapidly growing, over $1 billion startup.

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Halil Ayyildiz

Freelance RDF Developer
NetherlandsToptal Member Since October 22, 2020

With more than a decade of professional experience, Halil is a software developer with in-depth and broad expertise in back-end systems and cloud services. He also has hands-on experience in the reliability and scalability of planet-scale cloud systems. Halil is a lifelong learner and software expert who chooses the proper tools and algorithms to best solve business problems.

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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
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


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


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


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


How to Hire RDF Developers Through Toptal


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.

Work With Hand-Selected Talent

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

The Right Fit, Guaranteed

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


  • How are Toptal RDF developers different?

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

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

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

    We make sure that each engagement between you and your RDF 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 RDF Developers Are in High Demand.

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