Hire the Top 3% of Freelance Ontology Developers

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

No-Risk Trial, Pay Only If Satisfied.

Hire Freelance Ontology Developers and Engineers

Pablo de Castro

Freelance Ontology 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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Toni Cebrián

Freelance Ontology Developer
SpainToptal Member Since February 4, 2019

A rare mixture of data scientist and data engineer, Toni is able to lead projects from conception and prototyping to deploying at scale in the cloud.

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Laura Tolosi

Freelance Ontology 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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Neville Jos

Freelance Ontology Developer
United StatesToptal Member Since March 23, 2021

Neville is a data scientist with 8+ years of experience building data infrastructures, analyzing data for business impact, and producing research reports, all focusing mainly on the fintech sector. He has managed teams of up to 10 researchers, analysts, and programmers with the sole objective of increasing revenue for clients. Most recently, Neville was the research manager of BI at Better Mortgage, managing a team to analyze data on ROI, borrower backgrounds, and recruiting systems.

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Vincent Fazio

Freelance Ontology Developer
United StatesToptal Member Since February 25, 2019

Vincent is an agile software development leader specializing in software craftsmanship, project management, effective communication, and technical creativity to deliver business value through software reliably. As an experienced application architect specializing in designing secure, scalable, and reliable solutions, he has been instrumental in developing several high-quality, flexible full-stack software solutions. He can quickly adapt to new and evolving business needs.

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Bernardo Ferreira Bastos Braga

Freelance Ontology Developer
BrazilToptal Member Since May 11, 2022

Bernardo is a front-end software developer with over a decade of experience. He has founded two companies and co-developed a front-end chapter to support developers, profoundly affecting the company culture, which HR then replicated. He has built interactive books for iPad and Android tablets, delivered a proof-of-concept tool making tasks 37% faster, and served as tech lead for an oil and gas vertical, leading to a profitable new market in American onshore drilling.

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Diyaz Yakubov

Freelance Ontology Developer
FinlandToptal Member Since March 5, 2024

Diyaz is an expert in developing custom web solutions that precisely embody clients' visions. With a sharp focus on design aesthetics and cutting-edge technology, he consistently surpasses project expectations. His portfolio showcases various successful projects, highlighting his ability to adapt and innovate. Collaboration with Diyaz is a partnership that focuses on creativity, efficacy, and measurable outcomes.

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Bogdan Iancu

Freelance Ontology Developer
RomaniaToptal Member Since November 25, 2020

Bogdan is a software developer with more than 14 years of experience working for large European corporations. He has full-stack development skills with a focus on ASP.NET and Xamarin/.NET MAUI. He holds a PhD in computer science and teaches software development as an associate professor at the Bucharest University of Economic Studies. Bogdan founded Facem Soft in 2018 to have a more flexible working environment as a trainer and as a freelancer.

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Simon Geisler

Freelance Ontology Developer
GermanyToptal Member Since March 19, 2020

Simon is an AI and data science professional with more than five years of experience in data science, data engineering, software engineering, and system architecture design in the public cloud (products scaled to 10+ million users). In Germany and Silicon Valley, he worked on spatio-temporal IoT, natural language processing, and computer vision projects. Besides his strong affinity to modeling algorithms, Simon confidently develops production-grade microservices, Spark, and Kafka Streams apps.

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Michał Kowalczyk

Freelance Ontology Developer
PolandToptal Member Since January 11, 2022

Michał is a software engineer that loves tackling unusual problems. He trades off code testability, time to market, portability, performance, readability, security, technical debt, and resource constraints. Michał focuses on preventing bugs and suggests improvements to the codebase. He worked for large technology companies on products used by millions of users. Michał is a team player open for discussion, strives to achieve project goals, and is willing to adapt to the client's reality.

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

The Right Fit, Guaranteed

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

FAQs

  • How are Toptal Ontology developers different?

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

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

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

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

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